EPA 542-R-00-006
June 2000
Abstracts of Remediation
Case Studies
Volume 4
Federal
Remediation
Technologies
Roundtable
Prepared by the
Member Agencies of the
Federal Remediation Technologies Roundtable
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Abstracts of Remediation
Case Studies
Volume 4
Prepared by Member Agencies of the
Federal Remediation Technologies Roundtable
Environmental Protection Agency
Department of Defense
U.S. Air Force
U.S. Army
U.S. Navy
Department of Energy
Department of Interior
National Aeronautics and Space Administration
Tennessee Valley Authority
Coast Guard
June 2000
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NOTICE
This report and the individual case studies and abstracts were prepared by agencies of the U.S.
Government. Neither the U.S. Government nor any agency thereof, nor any of their employees, makes
any warranty, express or implied, or assumes any legal liability or responsibility for the accuracy,
completeness, or usefulness of any information, apparatus, product, or process disclosed, or represents
that its use would not infringe privately-owned rights. Reference herein to any specific commercial
product, process, or service by trade name, trademark, manufacturer, or otherwise does not imply its
endorsement, recommendation, or favoring by the U.S. Government or any agency thereof. The views
and opinions of authors expressed herein do not necessarily state or reflect those of the U.S. Government
or any agency thereof.
Compilation of this material has been funded wholly or in part by the U.S. Environmental Protection
Agency under EPA Contract No. 68-W-99-003.
11
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FOREWORD
This report is a collection of abstracts summarizing 78 case studies of site remediation applications
prepared by federal agencies. The case studies, collected under the auspices of the Federal Remediation
Technologies Roundtable, were undertaken to document the results and lessons learned from technology
applications. They will help establish benchmark data on cost and performance which should lead to
greater confidence in the selection and use of cleanup technologies.
The Roundtable was created to exchange information on site remediation technologies, and to consider
cooperative efforts that could lead to a greater application of innovative technologies. Roundtable
member agencies, including the U.S. Environmental Protection Agency, U.S. Department of Defense,
and U.S. Department of Energy, expect to complete many site remediation projects in the near future.
These agencies recognize the importance of documenting the results of these efforts, and the benefits to
be realized from greater coordination.
The case study reports and abstracts are organized by technology in a multi-volume set listed below. The
78 new case studies are available on a CD-ROM, and cover a variety of in situ and ex situ technologies.
Remediation Case Studies, Volumes 1-13, and Abstracts, Volumes 1-3, were published previously, and
contain 140 projects, and are also available on the CD-ROM. Abstracts, Volume 4, covers a wide variety
of technologies, including full-scale remediations and large-scale field demonstrations of soil and
groundwater treatment technologies. In the future, the set will grow as agencies prepare additional case
studies.
2000 Series
Published on CD-ROM, FRTR Cost and Performance Case Studies and Related Information,
EPA-542-C-00-001; June 2000
1998 Series
Volume 7: Ex Situ Soil Treatment Technologies (Bioremediation, Solvent Extraction,
Thermal Desorption), EPA-542-R-98-011; September 1998
Volume 8: In Situ Soil Treatment Technologies (Soil Vapor Extraction, Thermal Processes),
EPA-542-R-98-012; September 1998
Volume 9: Groundwater Pump and Treat (Chlorinated Solvents), EPA-542-R-98-013;
September 1998
Volume 10: Groundwater Pump and Treat (Nonchlorinated Contaminants), EPA-542-R-98-
014; September 1998
Volume 11: Innovative Groundwater Treatment Technologies, EPA-542-R-98-015;
September 1998
Volume 12: On-Site Incineration, EPA-542-R-98-016; September 1998
Volume 13: Debris and Surface Cleaning Technologies, and Other Miscellaneous
Technologies, EPA-542-R-98-017; September 1998
in
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1997 Series
Volume 5: Bioremediation and Vitrification, EPA-542-R-97-008; July 1997; PB97-177554
Volume 6: Soil Vapor Extraction and Other In Situ Technologies, EPA-542-R-97-009;
July 1997; PB97-177562
1995 Series
Volume 1: Bioremediation, EPA-542-R-95-002; March 1995; PB95-182911
Volume 2: Groundwater Treatment, EPA-542-R-95-003; March 1995; PB95-182929
Volume 3: Soil Vapor Extraction, EPA-542-R-95-004; March 1995; PB95-182937
Volume 4: Thermal Desorption, Soil Washing, and In Situ Vitrification, EPA-542-R-95-
005; March 1995; PB95-182945
Abstracts
Volume 1: EPA-542-R-95-001; March 1995; PB95-201711
Volume 2: EPA-542-R-97-010; July 1997; PB97-177570
Volume 3: EPA-542-R-98-010; September 1998
Volume 4: EPA-542-R-00-006; June 2000
Accessing Case Studies
The case studies and case study abstracts also are available on the Internet through the Federal
Remediation Technologies Roundtable web site at: http://www.frtr.gov. The Roundtable web site
provides links to individual agency web sites, and includes a search function. The search function allows
users to complete a key word (pick list) search of all the case studies on the web site, and includes pick
lists for media treated, contaminant types, and primary and supplemental technology types. The search
function provides users with basic information about the case studies, and allows them to view or
download abstracts and case studies that meet their requirements.
Users are encouraged to download abstracts and case studies from the Roundtable web site. Some of the
case studies are also available on individual agency web sites, such as for the Department of Energy.
In addition, a limited number of hard copies are available free of charge by mail from NSCEP (allow 4-6
weeks for delivery), at the following address:
U.S. EPA/National Service Center for Environmental Publications (NSCEP)
P.O. Box 42419
Cincinnati, OH 45242
Phone: (513) 489-8190 or
(800)490-9198
Fax: (513)489-8695
IV
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TABLE OF CONTENTS
Section Page
INTRODUCTION 1
ABSTRACTS
IN SITU SOIL TREATMENT ABSTRACTS 19
Cometabolic Bioventing at Building 719, Dover Air Force Base, Dover Delaware 20
Bioventing at Multiple Air Force Test Sites 22
In Situ Gaseous Reduction System Demonstrated at White Sands Missile Range, New Mexico . . 24
Electrokinetics at an Active Power Substation (Confidential Location) 26
Electrokinetics at Site 5, Naval Air Weapons Station Point Mugu, California 28
Electrokinetic Extraction at the Unlined Chromic Acid Pit, Sandia National Laboratories,
New Mexico 30
In-Situ Thermal Desorption at the Former Mare Island Naval Shipyard, California 32
Soil Vapor Extraction Enhanced by Six-Phase Soil Heating at Poleline Road Disposal Area,
Fort Richardson, Alaska 34
Phytoremediation at Argonne National Laboratory - West, Waste Area Group 9, Operable
Unit 9-04, Idaho Falls, Idaho 36
Phytoremediation at the Open Burn and Open Detonating Area, Ensign-Bickford Company,
Simsbury, Connecticut 38
Phytoremediation at Twin Cities Army Ammunition Plant, Minneapolis-St. Paul, Minnesota .... 40
EG&G's Aerobic Biofiltration System for the Destruction of Hydrocarbon Vapors from
Fuel-Contaminated Soils 42
Internal Combustion Engines for the Destruction of Hydrocarbon Vapors from Fuel-
Contaminated Soils 44
Purus PADREฎ Regenerative Resin System for the Treatment of Hydrocarbon Vapors from Fuel-
Contaminated Soils 46
Barometrically Enhanced Remediation Technology (BERT) Demonstration at Idaho
National Engineering and Environmental Laboratory, RWMC, Pit 2, Idaho Falls, Idaho 48
INCINERATION ABSTRACTS 51
On-Site Incineration at Weldon Spring Ordnance Works, St. Charles County, Missouri 52
THERMAL DESORPTION ABSTRACTS 55
Thermal Desorption at the Arlington Blending and Packaging Superfund Site
Arlington, Tennessee 56
v
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Thermal Desorption at Letterkenny Army Depot Superfund Site, K Areas, OU 1 Chambersburg,
Franklin County, Pennsylvania 58
Low Temperature Thermal Desorption at Longhorn Army Ammunition Plant, Karnack, Texas ... 60
Thermal Desorption at the Rocky Flats Environmental Technology Site, Trenches T-3 and T-4,
Golden, Colorado 62
OTHER EX SITU SOIL TREATMENT ABSTRACTS 65
Slurry Reactor Biotreatment of Explosives-Contaminated Soils at Joliet Army Ammunition
Plant, Joliet, Illinois 66
Joint Small Arms Range Remediation (Physical Separation and Acid Leaching) at Fort Polk
Range 5, Leesville, Louisiana 68
Thermo NUtech's Segmented Gate System at Los Alamos National Laboratory Technical
Area 33, Los Alamos, New Mexico 70
Thermo NUtech's Segmented Gate System at Pantex Plant, Firing Site 5, Amarillo, Texas 72
Thermo NUtech's Segmented Gate System at Sandia National Laboratories, ER Site 16,
Albuquerque, New Mexico 74
Thermo NUtech's Segmented Gate System at Sandia National Laboratories, ER Site 228A,
Albuquerque, New Mexico 76
Thermo NUtech's Segmented Gate System at Tonapah Test Range, Clean Slate 2,
Tonapah, Nevada 78
Chemical Extraction for Uranium Contaminated Soil at the RMI Titanium
Company Extrusion Plant, Ashtabula, Ohio 80
Transportable Vitrification System at Oak Ridge National Laboratory, Oak Ridge, Tennessee ... 82
PUMP AND TREAT ABSTRACTS 85
Groundwater Extraction and Treatment at the Logistics Center Operable Unit, Fort Lewis,
Washington 86
IN SITU GROUNDWATER TREATMENT ABSTRACTS 89
In Situ Bioremediation Using Molasses Injection at an Abandoned Manufacturing Facility,
Emeryville, California 90
In Situ Bioremediation Using Molasses Injection at the Avco Lycoming Superfund Site,
Williamsport, Pennsylvania 92
In Situ Bioremediation Using Bioaugmentation at Area 6 of the Dover Air Force Base,
Dover Delaware 94
Aerobic Degradation at Site 19, Edwards Air Force Base, California 96
In Situ Bioremediation at the Hanford 200 West Area Site, Richland, Washington 98
Aerobic Degradation at Moffett Naval Air Station, Mountain View, California 100
Enhanced In Situ Anaerobic Bioremediation of Fuel-Contaminated Ground Water 102
VI
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In Situ Bioremediation (Anaerobic/Aerobic) at Watertown, Massachusetts 104
Methane Enhanced Bioremediation Using Horizontal Wells at the Savannah River Site,
Aiken, South Carolina 106
In Situ Bioremediation at the Texas Gulf Coast Site, Houston, Texas 108
In Situ Redox Manipulation at U.S. DOE Hanford Site, 100-H and 100-D Areas 110
In Situ Chemical Oxidation Using Potassium Permanganate at Portsmouth Gaseous
Diffusion Plant, X-701B Facility 112
Phytoremediation Using Constructed Wetlands at the Milan Army Ammunition Plant,
Milan, Tennessee 114
Multi-Phase Extraction at the 328 Site, Santa Clara, CA 116
Dual Phase Extraction at the Defense Supply Center, Richmond, Virginia 118
Dual Vapor Extraction at Tinkham's Garage Superfund Site, Londonderry, NH 120
Frozen Soil Barrier at Oak Ridge National Laboratory, Oak Ridge, Tennessee 122
Horizontal Wells Demonstrated at U.S. DOE's Savannah River Site and Sandia
National Laboratory 124
In Situ Chemical Oxi-Cleanse Process at the Naval Air Station Pensacola Florida, Operable
Unit 10, Pensacola, Florida 126
In Situ Chemical Oxidation Using Fenton's Reagent at Naval Submarine Base Kings Bay,
Site 11, Camden County, Georgia 128
Six Phase Heating at the Skokie, Illinois Site 130
Hydrous Pyrolysis Oxidation/Dynamic Underground Stripping (HPO/DUS) at Visalia
Superfund Site, CA 132
Intrinsic Remediation at AOCs 43G and 43J, Fort Devens, Massachusetts 134
Monitored Natural Attenuation at Keesler Air Force Base, Mississippi 136
Monitored Natural Attenuation at Kelly Air Force Base , Former Building 2093
Gas Station, Texas 138
In Situ Permeable Reactive Barriers for Contaminated Groundwater at Fry Canyon 140
Permeable Reactive Wall Remediation of Chlorinated Hydrocarbons in Groundwater at
Moffett Field Superfund Site 142
Groundwater Extraction and a Permeable Reactive Treatment Cell at Tacony Warehouse,
Philadelphia, Pennsylvania 144
DEBRIS/SOLID MEDIA TREATMENT ABSTRACTS 147
Direct Chemical Oxidation at Lawrence Livermore National Laboratory Livermore, California . 148
Acid Digestion of Organic Waste at Savannah River Site, Aiken, South Carolina 150
Remotely Operated Scabbling at Argonne National Laboratory-East, Argonne, Illinois 152
Soft Media Blasting at the Fernald Site, Fernald, Ohio 154
Concrete Grinder at the Hanford Site, Richland, Washington 156
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Concrete Shaver at the Hanford Site, Richland, Washington 158
Concrete Spaller Demonstration at the Hanford Site, Richland, Washington 160
Stabilization Using Phosphate Bonded Ceramics at Argonne National Laboratory,
Argonne, Illinois 162
Stabilize Ash Using Clemson's Sintering Process at Clemson University, Clemson,
South Carolina 164
Mixed Waste Encapsulation in Polyester Resins at the Hanford Site 166
Innovative Grouting and Retrieval at the Idaho National Engineering and Environmental
Laboratory, Idaho Falls, Idaho 168
Polysiloxane Stabilization at Idaho National Engineering and Environmental Laboratory,
Idaho Falls, Idaho 170
Amalgamation of Mercury-Contaminated Waste using NFS DeHgSM Process, Applied
Technology Laboratories, Erwin, TX 172
Amalgamation of Mercury-Contaminated Waste using ADA Process, Colorado Minerals
Research Institute 174
GTS Duratek (GTSD) Process for Stabilizing Mercury (<260 ppm) Contaminated Mixed
Waste from U.S. DOE's Los Alamos National Laboratory 176
Stabilize High Salt Content Waste Using Sol Gel Process at Pacific Northwest National
Laboratory, Richland, WA 178
ATG Process for Stabilizing Mercury (<260 ppm) Contaminated Mixed Waste from
U.S. DOE's Portsmouth, Ohio Facility 180
Graphite Electrode DC Arc Furnace at the Idaho National Engineering and Environmental
Laboratory, Idaho Falls, Idaho 182
Plasma Hearth Process at the Science and Technology Applications Research (STAR) Center,
Idaho Falls, Idaho 184
Tables
1 Summary of Remediation Case Studies 3
2 Remediation Case Studies: Summary of Cost Data 11
Vlll
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INTRODUCTION
Increasing the cost effectiveness of site remediation is a national priority. The selection and use of more
cost-effective remedies requires better access to data on the performance and cost of technologies used in
the field. To make data more widely available, member agencies of the Federal Remediation
Technologies Roundtable (Roundtable) are working jointly to publish case studies of full-scale
remediation and demonstration projects. Previously, the Roundtable published 13 volumes of case study
reports. At this time, the Roundtable is publishing a CD-ROM containing 78 new case study reports,
primarily focused on soil and groundwater cleanup.
The case studies were developed by the U.S. Environmental Protection Agency (EPA), the U.S.
Department of Defense (DoD), and the U.S. Department of Energy (DOE). They were prepared based on
recommended terminology and procedures agreed to by the agencies. These procedures are summarized
in the Guide to Documenting and Managing Cost and Performance Information for Remediation Projects
(EPA 542-B-98-007; October 1998).
The case studies and abstracts present available cost and performance information for full-scale
remediation efforts and several large-scale demonstration projects. They are meant to serve as primary
reference sources, and contain information on site background and setting, contaminants and media
treated, technology, cost and performance, and points of contact for the technology application. The
studies contain varying levels of detail, reflecting the differences in the availability of data and
information. Because full-scale cleanup efforts are not conducted primarily for the purpose of
technology evaluation, data on technology cost and performance may be limited.
The case study abstracts in this volume describe a wide variety of ex situ and in situ soil treatment
technologies for both soil and groundwater. Contaminants treated included chlorinated solvents;
petroleum hydrocarbons and benzene, toluene, ethylbenzene, and xylenes; polycyclic aromatic
hydrocarbons; pesticides and herbicides; explosives/propellants; metals; and radioactivity. Many of the
applications described in the case study reports are ongoing and interim reports are provided
documenting their current status.
Table 1 provides summary information about the technology used, contaminants and media treated, and
project duration for the 78 technology applications in this volume. This table also provides highlights
about each application. Table 2 summarizes cost data, including information on quantity of media
1
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treated and quantity of contaminant removed. In addition, Table 2 shows a calculated unit cost for some
projects, and identifies key factors potentially affecting technology cost. (The column showing the
calculated unit costs for treatment provides a dollar value per quantity of media treated and contaminant
removed, as appropriate.) Cost data are shown as reported in the case studies and have not been adjusted
for inflation to a common year basis. The costs should be assumed to be dollars for the time period that
the project was in progress (shown on Table 1 as project duration).
While a summary of project costs is useful, it may be difficult to compare costs for different projects
because of unique site-specific factors. However, by including a recommended reporting format, the
Roundtable is working to standardize the reporting of costs to make data comparable across projects. In
addition, the Roundtable is working to capture information in case study reports that identify and
describe the primary factors that affect cost and performance of a given technology. Factors that may
affect project costs include economies of scale, concentration levels in contaminated media, required
cleanup levels, completion schedules, and matrix characteristics and operating conditions for the
technology.
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Table 1. Summary of Remediation Case Studies
Site Name, State (Technology)
Principal
Contaminants*
Chlorinated Solvents
BTEX and/or TPH
Pesticides/Herbicides
Explosives/Propellants
%
"3
1
Radionuclides
Media
(Quantity Treated**)
Project
Duration
Highlights
In Situ Soil Treatment
Dover Air Force Base, Building 719, Delaware
(Bioventing)
Multiple Air Force Test Sites, Multiple Locations
(Bioventing)
White Sands Missile Range, SWMU 143, New Mexico
(Chemical Reduction/Oxidation)
Active Power Substation, Confidential Location
(Electrokinetics)
Naval Air Weapons Station Point Mugu, Site 5,
California (Electrokinetics)
Sandia National Laboratories, Unlined Chromic Acid
Pit, New Mexico (Electrokinetics)
Former Mare Island Naval Shipyard, California (In
Situ Thermal Treatment; In Situ Thermal Desorption)
Fort Richardson Poleline Road Disposal Area, OU B,
Alaska (In Situ Thermal Treatment; Six Phase Heating)
Argonne National Laboratory - West, Waste Area
Group 9, OU 9-04, Idaho (Phytoremediation)
Ensign-Bickford Company - OB/OD Area, Connecticut
(Phytoremediation)
Twin Cities Army Ammunition Plant, Minnesota
(Phytoremediation)
Soil (450,000 Ibs)
Soil (200 to 270,000 yd3
per site)
Soil
Soil
Soil
Soil
Soil
Soil (3,910 yd3 or
7, 150 tons)
Soil
Soil
Soil
May 1998 to July 1999
April 1992 to December
1995 (typical test about
1 year)
April 1998 to June 1998
Summer 1998 (6 month
pilot-scale study)
March 1998 to June
1999
May 1996 to November
1996
September 1997 to
December 1997
July 1997 to December
1997 (treatability Study)
May 1998 to October
1998
April 1998 to October
1998
Spring/Summer 1998
Field demonstration of in situ cometabolic
bioventing to treat chlorinated solvents in
soil
Major initiative to demonstrate the
feasibility of bioventing for petroleum-
contaminated soil at 145 AF sites
Demonstrate use of injection of H2S for in
situ reduction of hexavalent chromium
First field demonstration of electrokinetic
remediation in the U. S. for arsenic-
contaminated soil
Field demonstration of electrokinetics for
treatment of metals in a sandy soil
The first field demonstration of
electrokinetics for removal of contaminant
ions from arid soil
Field demonstration of in situ thermal
desorption to treat PCBs in shallow and
deep contaminated soils
Demonstration of SPSH applied to
contamination in saturated soils.
Bench-scale testing of phytoremediation to
treat heavy metals in soil
Phytoremediation of lead in soil using both
phytoextraction and phyto stabilization
Phytoremediation of heavy metals in soil in
a northern climate
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Table 1. Summary of Remediation Case Studies (continued)
Site Name, State (Technology)
Patrick Air Force Base, Active Base Exchange Service
Station, Florida (Soil Vapor Extraction)
Patrick Air Force Base, Active Base Exchange Service
Station, Florida (Soil Vapor Extraction)
Vandenberg Air Force Base, Base Exchange Service
Station, California (Soil Vapor Extraction)
Idaho National Engineering and Environmental
Laboratory, Pit 2, Idaho (Soil venting, BERT)
Principal
Contaminants*
Chlorinated Solvents
*
BTEX and/or TPH
*
*
*
Pesticides/Herbicides
Explosives/Propellants
"3
Radionuclides
Media
(Quantity Treated**)
Soil vapors
Soil vapors
Soil vapors
Soil
Project
Duration
January 1 994 to
February 1994
October 1993 to January
1994
February 1994 to June
1994
December 1996 to
January 1999
Highlights
Demonstration of treatment of extracted
vapors from an SVE system using
biofiltration
Demonstration of treatment of extracted
vapors from an SVE system using an
internal combustion engine
Demonstration of treatment of extracted
vapors from an SVE system using resin
adsorption
Demonstrate use of passive soil venting for
remediation of VOC-contamination
Incineration
Former Weldon Springs Ordnance Works, OU 1,
Missouri (Incineration (on-site))
*
Soil (30,000 tons or
18,000yd3)
Wooden pipeline
August 1998 to 1999
Use of on-site incineration for treatment of
nitroaromatic-contaminated materials
Thermal Desorption
Arlington Blending and Packaging Superfund Site,
Tennessee (Thermal Desorption)
Letterkenny Army Depot Superfund Site, K Areas,
OU1, Pennsylvania (Thermal Desorption)
Longhorn Army Ammunition Plant, Burning Ground
No. 3, Texas (Thermal Desorption)
Rocky Flats Environmental Technology Site, Trenches
T-3 and T-4, Colorado (Thermal Desorption)
*
*
*
*
*
*
*
Soil (4 1,431 tons)
Soil (13,986 yd3)
Soil (32,293 yd3 or
5 1,669 tons)
Soil and debris
(3,796 yd3)
January 1996 to June
1996
September 1993 to
October 1994
February 1997 to
December 1997
June 1 996 to August
1996
Application of low temperature thermal
desorption to treat pesticide-contaminated
soil
Thermal desorption to treat VOC-
contaminated soil, including soils with high
oil and grease content
Thermal desorption of soil with high
concentrations of chlorinated solvents
Application of thermal desorption to treat
soils contaminated with VOCs and low
levels of radiation
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Table 1. Summary of Remediation Case Studies (continued)
Site Name, State (Technology)
Principal
Contaminants*
Chlorinated Solvents
BTEX and/or TPH
Pesticides/Herbicides
Explosives/Propellants
"3
Radionuclides
Media
(Quantity Treated**)
Project
Duration
Highlights
Other Ex Situ Soil Treatment
Joliet Army Ammunition Plant, Illinois
(Bioremediation (ex situ) Slurry Phase)
Fort Polk Range 5, Louisiana (Chemical
Reduction/Oxidation)
Los Alamos National Laboratory, Technical Area 33,
New Mexico (Physical Separation; Segmented Gate
System)
Pantex Plant, Firing Site 5, Texas (Physical Separation;
Segmented Gate System)
Sandia National Laboratories, ER Site 16, New
Mexico (Physical Separation; Segmented Gate System)
Sandia National Laboratories, ER Site 228A, New
Mexico (Physical Separation; Segmented Gate System)
Tonapah Test Range, Clean Slate 2, Nevada (Physical
Separation; Segmented Gate System)
RMI Titanium Company Extrusion Plant, Ohio
(Solvent Extraction)
Oak Ridge National Laboratory, Tennessee
(Vitrification)
*
*
*
*
*
*
*
*
*
*
*
Soil
Soil (1,098 tons)
Soil and debris
(2,526 yd3)
Soil and debris (294 yd3)
Soil (66 1.8 yd3)
Soil (1,352 yd3)
Soil and debris (333 yd3)
Soil (64 ton; 38 batches)
Sludge (1 6,000 Ibs)
July 1994 to August
1995
August 1996 to
December 1996
April 1999 to May 1999
March 1998 to May
1998
February 1998 to March
1998
July 1998 to November
1998
May 1998 to June 1998
January 1997 to
February 1997
October 1997
Use of bioslurry technology for treatment
of explosives wastes
Demonstration of physical separation and
acid leaching to treat metals in soil
Use of a gate system to reduce soil volume
requiring off-site disposal
Use of a gate system to reduce soil volume
requiring off-site disposal
Use of a gate system to reduce soil volume
requiring off-site disposal
Use of a gate system to reduce soil volume
requiring off-site disposal
Use of a gate system to reduce soil volume
requiring off- site disposal
Demonstration of chemical leaching
process for treatment of uranium-
contaminated soil
Demonstration of a transportable
vitrification system to treat low-level mixed
waste sludges
Pump and Treat
Fort Lewis Logistics Center, Washington (Pump and
Treat)
*
Groundwater
(2.147 million gallons)
August 1995 to ongoing
Containment of lateral migration of
contaminants
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Table 1. Summary of Remediation Case Studies (continued)
Site Name, State (Technology)
Principal
Contaminants*
Chlorinated Solvents
BTEX and/or TPH
Pesticides/Herbicides
Explosives/Propellants
Sซ
"3
1
Radionuclides
Media
(Quantity Treated**)
Project
Duration
Highlights
In Situ Groundwater Treatment
Abandoned Manufacturing Facility - Emeryville,
California (Bioremediation (in situ) Groundwater)
Avco Lycoming Superfund Site, Pennsylvania
(Bioremediation (in situ) Groundwater)
Dover Air Force Base, Area 6, Delaware
(Bioremediation (in situ) Groundwater)
Edwards Air Force Base, California (Bioremediation
(in situ) Groundwater)
Hanford 200 West Area, Washington (Bioremediation
(in situ) Groundwater)
Moffett Field Superfund Site, California
(Bioremediation (in situ) Groundwater)
Naval Weapons Station Seal Beach, California
(Bioremediation (in situ) Groundwater)
Watertown Site, Massachusetts (Bioremediation (in
situ) Groundwater)
Savannah River Site, South Carolina (Bioremediation
(in situ) Groundwater)
Texas Gulf Coast Site, Texas (Bioremediation (in situ)
Groundwater)
Hanford Site, 100-H and 100-D Areas, Washington
(Chemical Reduction/Oxidation)
Groundwater
Groundwater
Groundwater
Groundwater
(12,132m3 pumped)
Groundwater
Groundwater
Groundwater (in situ),
Soil (in situ), LNAPL
Groundwater
Groundwater and
sediment
Groundwater
Groundwater
Ongoing, data from
April 1997 to October
1998
Ongoing, data through
July 1998
Testing Phase:
September 1996 to June
1999
February 1996 to April
1997
January 1995 to March
1996
September 1986 to
November 1988
September 1997 to
October 1998
Ongoing, data from
November 1996 to
October 1997
February 1992 to April
1993
Ongoing, data from June
1995 to December 1998
September 1995 to
September 1998
Bioremediation of a site contaminated with
both chlorinated solvents and hexavalent
chromium
One of the first applications of molasses
injection technology on a full scale at a
Superfund site
First successful bioaugmentation project
using live bacteria from another site to treat
TCE using reductive dechlorination
Field demonstration using groundwater
recirculation wells to remediate TCE in a
two-aquifer system
In situ bioremediation of chlorinated
solvents and nitrate
One of the earliest field demonstrations of
aerobic in situ bioremediation
Demonstrate anaerobic bioremediation for
treating fuel hydrocarbons
Combined anaerobic/aerobic system for
treatment of chlorinated solvents
Demonstration using horizontal wells and
methane injection
Groundwater recirculation system using
trenches for extraction and injection
Demonstrate in situ redox manipulation for
treatment of hexavalent chromium
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Table 1. Summary of Remediation Case Studies (continued)
Site Name, State (Technology)
Portsmouth Gaseous Diffusion Plant, X-701B Facility,
Ohio (Chemical Reduction/Oxidation)
Milan Army Ammunition Plant, Tennessee
(Constructed Wetlands)
328 Site, California (Dual-Phase Extraction)
Defense Supply Center, Acid Neutralization Pit,
Virginia (Dual-Phase Extraction)
Tinkham's Garage Superfund Site, New Hampshire
(Dual-Phase Extraction)
Oak Ridge National Laboratory, Tennessee (Frozen
Soil Barrier)
Portsmouth Gaseous Diffusion Plant, X-701B Facility,
Ohio (In Situ Oxidation)
Naval Air Station Pensacola, OU 10, Florida (In Situ
Oxidation; Fenton's Reagent)
Naval Submarine Base Kings Bay, Georgia (In Situ
Oxidation; Fenton's Reagent)
Confidential Manufacturing Facility, Illinois (In Situ
Thermal Treatment; Six Phase Heating)
Visalia Superfund Site, California (In Situ Thermal
Treatment; Dynamic Underground Stripping)
Fort Devens, AOCs 43G and 43 J, Massachusetts
(Monitored Natural Attenuation)
Principal
Contaminants*
Chlorinated Solvents
BTEX and/or TPH
Pesticides/Herbicides
Explosives/Propellants
ซn
*ซj
1
Radionuclides
Media
(Quantity Treated**)
Groundwater (in situ)
Groundwater
Soil and Groundwater
Soil, Groundwater
(17 million gallons)
Soil (9,000 yd3)
Groundwater
Soil, Sediment,
Groundwater
Groundwater (in situ)
Groundwater
Groundwater (78,989
gallons)
Soil and groundwater
(34,600 yd3)
Groundwater
Groundwater
Project
Duration
Spring 1997 (operated
for one month)
June 1996 to July 1998
November 1996 to May
1999
July 1997 to July 1998
November 1994 to
September 1995
September 1996 to
September 1998
1988 to 1993
November 1998 to May
1999
November 1998 to
August 1999
June 1998 to April 1999
June 1997 to mid-1 999
March 1997 to June
1999
Highlights
Demonstrate in situ chemical oxidation for
treating chlorinated solvents
Use of constructed wetlands for treatment
of explosives-contaminated groundwater
Use of DPE with pneumatic fracturing for
VOCs in silty clay soils and shallow
groundwater
Use of DPE to treat soil and groundwater
contaminated with chlorinated solvents
Use of DVE to treat soil and groundwater
contaminated with chlorinated solvents
Demonstrate frozen soil barrier for
containment of contaminated surface
impoundment
Demonstrate use of horizontal wells to treat
groundwater at multiple sites and locations
Field demonstration of in situ chemical
oxidation using Fenton's reagent to treat
chlorinated solvents
Use of Fenton's Reagent to remediate
chlorinated solvents in groundwater
Use of SPH to remediate chlorinated
solvents in soil and groundwater
Use of HPO/DUS for treatment of large
quantity of creosote in groundwater
Intrinsic remediation for a site
contaminated with BTEX
-------
Table 1. Summary of Remediation Case Studies (continued)
Site Name, State (Technology)
Keesler Air Force Base Service Station, AOC-A
(ST-06), Mississippi (Monitored Natural Attenuation)
Kelly Air Force Base, Former Building 2093 Gas
Station, Texas (Monitored Natural Attenuation)
Fry Canyon, Utah (Permeable Reactive Barrier)
Moffett Field Superfund Site, California (Permeable
Reactive Barrier)
Tacony Warehouse, Pennsylvania (Permeable Reactive
Barrier; Pump and Treat)
Principal
Contaminants*
Chlorinated Solvents
BTEX and/or TPH
Pesticides/Herbicides
Explosives/Propellants
ซn
*ซj
1
Radionuclides
Media
(Quantity Treated**)
Soil, groundwater, and
soil gas
Soil, groundwater, and
soil gas
Groundwater
(33,000 ft3 or 200,000
gallons)
Groundwater
Groundwater (393, 165
gallons during the first
year)
Project
Duration
September 1997 to April
1999
July 1997 to July 1998
Ongoing, data from
September 1997 to
September 1998
April 1996 to December
1997
May 1998 through 2001
(projected)
Highlights
Monitored natural attenuation for a
gasoline contaminated site
Monitored natural attenuation for a
gasoline-contaminated site
Demonstration of three types of PRBs to
treat uranium-contaminated groundwater
Demonstration of PRB to remediate
groundwater contaminated with chlorinated
solvents
Use of an extraction well surrounded by
permeable reactive media at site
contaminated with chlorinated solvents.
Debris/Solid Media Treatment
Lawrence Livermore National Laboratory, California
(Chemical Reduction/Oxidation; Direct Chemical
Oxidation)
Savannah River Site, South Carolina (Chemical
Reduction/Oxidation)
Argonne National Laboratory - East, Illinois (Physical
Separation)
Argonne National Laboratory - East, Illinois (Physical
Separation)
Femald Site, Ohio (Physical Separation)
Waste streams from
LLNL operations
Organic wastes
Debris (concrete)
Debris (concrete floor)
Debris
Not identified
1996 to 1997
August 1997 to
September, 1997
Not identified
August 1996 to
September 1996
Pilot-scale demonstration of the DCO
process to treat a variety of organic
aqueous waste streams
Demonstrate acid digestion of organic
wastes as an alternative to incineration
Demonstration of a remotely-controlled
concrete demolition system to remove
radioactively contaminated concrete
Demonstration of a remotely-operated
scabbier to decontaminate radioactive
concrete flooring
Demonstration of soft blast media to clean
surfaces contaminated with uranium
-------
Table 1. Summary of Remediation Case Studies (continued)
Site Name, State (Technology)
Hanford Site, Washington (Physical Separation)
Hanford Site, Washington (Physical Separation)
Hanford Site, Washington (Physical Separation)
Argonne National Laboratory - East, Illinois
(Solidification/Stabilization)
Clemson University, South Carolina
(Solidification/Stabilization)
Hanford Site, Washington (Solidification/Stabilization)
Idaho National Engineering and Environmental
Laboratory, Idaho (Solidification/Stabilization)
Idaho National Engineering and Environmental
Laboratory, Idaho (Solidification/Stabilization)
Idaho National Engineering and Environmental
Laboratory, Idaho (Solidification/Stabilization)
Los Alamos National Laboratory, New Mexico
(Solidification/Stabilization)
Los Alamos National Laboratory, New Mexico
(Solidification/Stabilization)
Principal
Contaminants*
Chlorinated Solvents
BTEX and/or TPH
Pesticides/Herbicides
Explosives/Propellants
Sซ
"3
1
Radionuclides
Media
(Quantity Treated**)
Debris (concrete) (54 ft2)
Debris (concrete)
Debris (contaminated
concrete walls and
floors) (4.6m2)
Salt-containing waste
streams
Incinerator fly ash
Process waste streams
Soil and debris
Process waste streams
Liquid mercury (75 kg)
Liquid mercury (132 kg)
Sludge (1,253 Ibs)
Laboratory Wastes
Project
Duration
November 1997
November 1997
January 1998
Not identified
1995
Not identified
Summer 1994 to
Summer 1996
1997 to 1998
1998
1998
September 1997 to
September 1998
Highlights
Demonstration of a light weight hand-held
grinder to decontaminate radioactive
concrete surfaces
Demonstration of a concrete shaver to
decontaminate radioactive concrete
surfaces
First demonstration of the hand-held
concrete spaller on contaminated surfaces
Demonstration of phosphate-bonded
ceramics to stabilize a variety of high salt-
containing wastes
Treatability study of stabilization of mixed
waste fly ash using a sintering process
Treatability study of various polyester resins
to stabilize high salt-containing mixed waste
Field demonstration of innovative jet
grouting and retrieval techniques that are
applicable to TRU wastes
Demonstration of polysiloxane to
encapsulate high-salt content wastes
Demonstrate amalgamation of elemental
mercury
Demonstrate amalgamation of elemental
mercury
Demonstrate stabilization of low level
mercury in radioactive wastes
-------
Table 1. Summary of Remediation Case Studies (continued)
Site Name, State (Technology)
Pacific Northwest National Laboratory, Washington
(Solidification/Stabilization)
Portsmouth Gaseous Diffusion Plant, Ohio
(Solidification/Stabilization)
Idaho National Engineering and Environmental
Laboratory, Idaho (Vitrification)
STAR Center, Idaho (Vitrification)
Principal
Contaminants*
Solvents
"a
S
3
-2
o
1
S-
1
a
a
X
W
CO
erbicides
5
ซA
a
'0
4aป
&
ropellants
6i3
1
Sซ
o
B.
w
ซn
S
5ป
S
=3
s
o
'3
PA
Media
(Quantity Treated**)
Salt waste surrogates
Ion exchange resin
(160kg)
Wastes - including slag,
plutonium-238 waste,
neutron generators
Fly ash, soil, sludges,
debris
Project
Duration
Not identified
1998
1997 to 1998
1993 to 1997
Highlights
Laboratory testing of the sol gel process to
stabilize high salt content waste
Demonstrate stabilization of low level
mercury in radioactive wastes
Demonstrate DC arc plasma furnace to treat
a variety of wastes from DOE facilities
Demonstration of a plasma hearth furnace
to treat metals and radionuclides in a
variety of waste types
' Principal contaminants are one or more specific constituents within the groups shown that were identified during site investigations.
10
-------
Table 2. Remediation Case Studies: Summary of Cost Data
Site Name, State (Technology)
Technology Cost
($y-2
Quantity of Media
Treated
Quantity of
Contaminant
Removed
Calculated Unit Cost
for Treatment lp2
Key Factors
Potentially Affecting
Technology Costs* * *
In Situ Soil Treatment
Dover Air Force Base, Building 719, Delaware
(Bioventing)
Multiple Air Force Test Sites, Multiple Locations
(Bioventing)
White Sands Missile Range, SWMU 143, New Mexico
(Chemical Reduction/Oxidation)
Active Power Substation, Confidential Location
(Electrokinetics)
Naval Air Weapons Station Point Mugu, Site 5,
California (Electrokinetics)
Sandia National Laboratories, Unlined Chromic Acid
Pit, New Mexico (Electrokinetics)
Former Mare Island Naval Shipyard, California (In
Situ Thermal Treatment; In Situ Thermal Desorption)
Fort Richardson Poleline Road Disposal Area, OU B,
Alaska (In Situ Thermal Treatment; Six Phase Heating)
Argonne National Laboratory - West, Waste Area
Group 9, OU 9-04, Idaho (Phytoremediation)
Ensign-Bickford Company - OB/OD Area, Connecticut
(Phytoremediation)
Twin Cities Army Ammunition Plant, Minnesota
(Phytoremediation)
Patrick Air Force Base, Active Base Exchange Service
Station, Florida (Soil Vapor Extraction - Biofiltration)
Not provided
P: $92,300
P: $798,163
Not provided
Not provided
Not provided
Not provided
$967,822
P: $2,247,000
Not provided
Not provided
Not provided
450,000 Ibs
200 to 270,000
cubic yards per site
Not provided
Not provided
Not provided
Not provided
Not provided
3,910 cubic yards
Not provided
Not provided
Not provided
Not provided
Not provided
Not provided
Not provided
Not provided
Not provided
Not provided
Not provided
Not provided
Not provided
Not provided
Not provided
Not provided
Not provided
P: $10 to $60 per cubic
yard
P: $43 to $100 per cubic
yard
Not provided
Not provided
Not provided
$100 to $250 per ton
(vendor estimate)
$189 to $288 per cubic
yard, $726 to $2,552 per
Ib of contaminant
removed
Not provided
Not provided
$30.34 per cubic yard of
soil per year ($153 per
cubic yard over the life of
the project)
$18.66 to $38.06 per kg
(costs estimates were
provided by other
vendors)
Not provided
Volume of soil treated,
with lower costs for
sites with > 10,000 yds3
Size of the waste site
Not provided
Not provided
Not provided
Not provided
Availability and cost for
power
Amount of time needed
to meet goals and size
of area treated
Not provided
Amount of time needed
to meet goals and size
of area treated
Contaminant
concentration and flow
rate
11
-------
Table 2. Remediation Case Studies: Summary of Cost Data (continued)
Site Name, State (Technology)
Patrick Air Force Base, Active Base Exchange Service
Station, Florida (Soil Vapor Extraction - Thermal
Destruction)
Vandenberg Air Force Base, Base Exchange Service
Station, California (Soil Vapor Extraction - Resin
Adsorption)
Idaho National Engineering and Environmental
Laboratory, Pit 2, Idaho (Soil venting BERT)
Technology Cost
($)W
Not provided
DEMO: $36,634
P: $67,860
Quantity of Media
Treated
Not provided
Not provided
Not provided
Quantity of
Contaminant
Remoyed
Not provided
570 gals of
hydrocarbons
Chlorinated
solvents ranged
from 0.25 to 2.9
gms/day
Calculated Unit Cost
for Treatment w
Operating costs of $0.83
to $15. 40 per kg TVH
destroyed, $97 to $550
perkgofBTEX
destroyed
DEMO: $23 per kg of
hydrocarbon removed
P: $100 per cubic yard
Key Factors
Potentially Affecting
Technology Costs***
Contaminant
concentration and
supplemental fuel
requirement
Contaminant
concentration and flow
rate
Size of contaminated
area and length of
operation
Incineration
Former Weldon Springs Ordnance Works, OU 1,
Missouri (Incineration (on-site))
$13,665,997
30,000 tons
(18,000 cubic
yards)
85,230 feet of
pipeline
Not provided
Not provided
Types and properties of
materials treated (such
as moisture content,
BTU value)
Thermal Desorption
Arlington Blending and Packaging Superfund Site,
Tennessee (Thermal Desorption)
Letterkenny Army Depot Superfund Site, K Areas,
OU1, Pennsylvania (Thermal Desorption)
Longhorn Army Ammunition Plant, Burning Ground
No. 3, Texas (Thermal Desorption)
Rocky Flats Environmental Technology Site, Trenches
T-3 and T-4, Colorado (Thermal Desorption)
C: $4,293,893
0: $62,351
$4,647,632
$4,886,978
$1,934,203
41,431 tons
13,986 cubic yards
32,293 cubic yards
(5 1,669 tons)
3,796 cubic yards
Not provided
Not provided
Not provided
Not provided
$105 per ton
$220 per cubic yard
$151 per cubic yard
$350 per cubic yard
Types and properties of
materials treated such
as moisture content and
types of contaminants
(pesticides)
Types and properties of
materials treated such
as moisture content and
types of contaminants
(high oil and grease
content)
Types and properties of
materials treated such
as moisture content and
types of contaminants
(solvents)
Use of radiological
engineering controls
12
-------
Table 2. Remediation Case Studies: Summary of Cost Data (continued)
Site Name, State (Technology)
Technology Cost
($)W
Quantity of Media
Treated
Quantity of
Contaminant
Remoyed
Calculated Unit Cost
for Treatment w
Key Factors
Potentially Affecting
Technology Costs***
Other Ex Situ Soil Treatment
Joliet Army Ammunition Plant, Illinois
(Bioremediation (ex situ) Slurry Phase)
Fort Polk Range 5, Louisiana (Physical Separation and
Acid Leaching)
Los Alamos National Laboratory, Technical Area 33,
New Mexico (Physical Separation; Segmented Gate
System)
Pantex Plant, Firing Site 5, Texas (Physical Separation;
Segmented Gate System)
Sandia National Laboratories, ER Site 16, New
Mexico (Physical Separation; Segmented Gate System)
Sandia National Laboratories, ER Site 228A, New
Mexico (Physical Separation; Segmented Gate System)
Tonapah Test Range, Clean Slate 2, Nevada (Physical
Separation; Segmented Gate System)
RMI Titanium Company Extrusion Plant, Ohio
(Solvent Extraction)
Oak Ridge National Laboratory, Tennessee
(Vitrification)
Not provided
DEMO: $1,169,000
P: $1,700,000
$275,745
$203,887
$164,109
$220,040
$138,126
Pilot: $638,670
C: $5,000,000
AO: $10 to $44 per
kg of waste
Not provided
DEMO: 835 tons
PC: 10,000 tons
2,526 cubic yards
294 cubic yards
661.8 cubic yards
1,352 cubic yards
333 cubic yards
64 tons (38 batches)
16,000 Ibs of pond
and neutralization
sludge
Not provided
Not provided
Not provided
Not provided
Not provided
Not provided
Not provided
Not provided
Not provided
P: $290 to $350 per
cubic yard
DEMO: $1,400 per ton
P: $170 per ton
$109 per cubic yard
$111 per cubic yard
$236 per cubic yard
$154 per cubic yard
Not provided
P: $250 to $350 per ton
of soil
Not provided
Use of additives and
frequency of
replacement
Volume of waste
treated and level of
treatment required to
regenerate leachate
Quantity of material
processed
Quantity of material
processed
Quantity of material
processed
Quantity of material
processed
Quantity of material
processed
Contaminant
concentrations and
amount of heating
required for solvent
Size of area treated;
energy requirements;
and level of emission
controls required
13
-------
Table 2. Remediation Case Studies: Summary of Cost Data (continued)
Site Name, State (Technology)
Technology Cost
($)W
Quantity of Media
Treated
Quantity of
Contaminant
Remoyed
Calculated Unit Cost
for Treatment w
Key Factors
Potentially Affecting
Technology Costs***
Pump and Treat
Fort Lewis Logistics Center, Washington (Pump and
Treat)
$5,208,000
2. 147 million
gallons (through
8/98)
2,772 Ibs of TCE
(through 9/97)
Not provided
Length of system
operation; presence of
DNAPL
In Situ Groundwater Treatment
Abandoned Manufacturing Facility - Emeryville,
California (Bioremediation (in situ) Groundwater)
Avco Lycoming Superfund Site, Pennsylvania
(Bioremediation (in situ) Groundwater)
Dover Air Force Base, Area 6, Delaware
(Bioremediation (in situ) Groundwater)
Edwards Air Force Base, California (Bioremediation
(in situ) Groundwater)
Hanford 200 West Area, Washington (Bioremediation
(in situ) Groundwater)
Moffett Field Superfund Site, California
(Bioremediation (in situ) Groundwater)
Naval Weapons Station Seal Beach, California
(Bioremediation (in situ) Groundwater)
Watertown Site, Massachusetts (Bioremediation (in
situ) Groundwater)
Savannah River Site, South Carolina (Bioremediation
(in situ) Groundwater)
Texas Gulf Coast Site, Texas (Bioremediation (in situ)
Groundwater)
Hanford Site, 100-H and 100-D Areas, Washington
(Chemical Reduction/Oxidation)
$400,000
C: $220,000
AO: $50,000
C: $285,563
O: $522,620 (for 15
months)
C: $323,452
0: $14,354
Not provided
Not provided
DEMO: $875,000
P: $1,085,000
DEMO: $150,000
PC: $452,407
PAO: $236,465
C: $600,000
AO: $100,000
Not provided
Not provided
Not provided
Not provided
Not provided
Not provided
Not provided
Not provided
Not provided
Not provided
Not provided
Not provided
Not provided
Not provided
Not provided
12,132 cubic meters
Not provided
Not provided
Not provided
Not provided
17,000 Ibs VOCs
Not provided
Not provided
Not provided
Not provided
Not provided
Not provided
P: $5.80 per cubic meter
Not provided
P: $4,340 per gallon of
fuel
Not provided
Not provided
Not provided
Not provided
Size of area treated;
amount and frequency
of molasses injections
required
Size of area treated;
amount and frequency
of molasses injections
required
Size of area treated;
amount and type of
additives
Size of area treated; two
contaminated aquifers
Plume size - cost
effective for small
plumes (100 m
diameter)
Not provided
Size of area treated; for
demo, analytical costs
Not provided
Size of area treated;
DNAPL present
Size of area treated; use
of methanol as additive
Not provided
14
-------
Table 2. Remediation Case Studies: Summary of Cost Data (continued)
Site Name, State (Technology)
Portsmouth Gaseous Diffusion Plant, X-701B Facility,
Ohio (Chemical Reduction/Oxidation)
Milan Army Ammunition Plant, Tennessee
(Constructed Wetlands)
328 Site, California (Dual-Phase Extraction)
Defense Supply Center, Acid Neutralization Pit,
Virginia (Dual-Phase Extraction)
Tinkham's Garage Superfund Site, New Hampshire
(Dual-Phase Extraction)
Oak Ridge National Laboratory, Tennessee (Frozen
Soil Barrier)
Savannah River Site, Aiken, South Carolina
(Horizontal Wells)
Naval Air Station Pensacola, OU 10, Florida (In Situ
Oxidation; Fenton's Reagent)
Naval Submarine Base Kings Bay, Georgia (In Situ
Oxidation; Fenton's Reagent)
Confidential Manufacturing Facility, Illinois (In Situ
Thermal Treatment; Six Phase Heating)
Visalia Superfund Site, California (In Situ Thermal
Treatment; Dynamic Underground Stripping)
Fort Devens, AOCs 43G and 43 J, Massachusetts
(Monitored Natural Attenuation)
Technology Cost
($)W
DEMO: $562,000
P: $516,360
P: $3,466,000
C: $300,000
O: $550,000
Treat: $538,490
$1,500,000
DEMO: $1,809,000
Not provided
DEMO
C: $97,018
O: $81,320
Phase 1: $223,000
Not provided
Not provided
$671,642
PAO: $50,000
Quantity of Media
Treated
Not provided
Not provided
Not provided
17 million gallons
ofgroundwater
9,000 cubic yards
Not provided
Not provided
Not provided
Phase 1: 78,989
gallons
Not provided
Not provided
Not provided
Quantity of
Contaminant
Remoyed
Not provided
Not provided
l,2201bsVOCs
145 Ibs VOCs
Not provided
Not provided
Not provided
Not provided
Not provided
Not provided
141,000 gal of
creosote
Not provided
Calculated Unit Cost
for Treatment w
P: $64 per cubic yard
P: $1.78 per 1,000
gallons of groundwater
$53 per cubic yard
(based on treatment of
16,000 cubic yards)
Treat: $0.03 per gallon
$170 per cubic yard
Not provided
Not provided
Not provided
Not provided
$32 per cubic yard
P: $39 per cubic yard
Not provided
Key Factors
Potentially Affecting
Technology Costs***
Size of area treated;
DNAPL present
Type of system used
(gravel vs. lagoon-
based), size of area
treated, and climate
Use of pneumatic
fracturing;
contamination in two
aquifer zones
Volume ofgroundwater
treated; contamination
confined to upper
aquifer
Size of area treated;
contamination in two
aquifer zones
Complex hydrogeology
due to presence of
fractured bedrock
Not provided
Volume of reagent
injected and frequency
of injections
Volume of reagent
injected and frequency
of injections
Size of area treated;
power requirements
Groundwater extraction
capacity and plume size
Length of remediation;
monitoring
requirements
15
-------
Table 2. Remediation Case Studies: Summary of Cost Data (continued)
Site Name, State (Technology)
Keesler Air Force Base Service Station, AOC-A
(ST-06), Mississippi (Monitored Natural Attenuation)
Kelly Air Force Base, Former Building 2093 Gas
Station, Texas (Monitored Natural Attenuation)
Fry Canyon, Utah (Permeable Reactive Barrier)
Moffett Field Superfund Site, California (Permeable
Reactive Barrier)
Tacony Warehouse, Pennsylvania (Permeable Reactive
Barrier; Pump and Treat)
Debris/Solid Media Treatment
Lawrence Livermore National Laboratory, California
(Chemical Reduction/Oxidation)
Savannah River Site, South Carolina (Chemical
Reduction/Oxidation)
Argonne National Laboratory - East, Argonne, Illinois
(Concrete Scabbling)
Femald Site, Femald, Ohio (Soft Media Blasting)
Hanford Site, Hanford, Washington (Concrete Grinder)
Technology Cost
($)W
PO: $15,000 per
event
Not provided
DEMO C: $674,000
PAO: $55,000 to
$60,000
PC: $4,910,942
PAO: $72,278
$607,336
C: $416,777
AO: $16,880
Other: $132,417
Not provided
P: $2,000,000 to
$8,000,000
C: $165,000
O: $l,995/day
Not provided
C: $854 (purchase);
$75/week (rental)
Quantity of Media
Treated
Not provided
Not provided
33,000 cubic feet
(200,000 gallons
through 9/98)
Not provided
393,165 gallons
during the first year
Quantity of
Contaminant
Remoyed
Not provided
Not provided
Not provided
Not provided
Not provided
Calculated Unit Cost
for Treatment w
Not provided
Not provided
Not provided
Not provided
Not provided
Key Factors
Potentially Affecting
Technology Costs***
Length of remediation;
monitoring
requirements
Not provided
Type of reactive media;
size of PRB
Size of PRB and type of
reactive material;
projected costs assume
PRB constructed in two
sections
Size of PRB and type of
reactive material
Not provided
Not provided
Not provided
Not provided
54 square feet
Not provided
Not provided
Not provided
Not provided
Not provided
P: $9. 88 per kg of carbon
in the waste if oxidant
recycled; $79 per kg of
carbon if not recycled
Not provided
Not provided
DEMO: $4.60 per square
foot
Not provided
Amount of carbon in
waste stream; whether
oxidant is recycled
Physical and chemical
characteristics of waste
stream; volume treated
Area and depth of
concrete surface treated;
extent of particulate
controls used
Grade of media used;
size and depth of
concrete surface treated;
noise protection used
Size and depth of
concrete surface treated
16
-------
Table 2. Remediation Case Studies: Summary of Cost Data (continued)
Site Name, State (Technology)
Hanford Site, Washington (Concrete Shaver)
Hanford Site, Washington (Concrete Spaller)
Argonne National Laboratory - East, Illinois
(Phosphate Bonded Ceramic Stabilization)
Clemson University, Clemson, South Carolina
(Stabilization Using Clemson's Sintering Process)
Hanford Site, Hanford, Washington (Polyester Resin
Encapsulation)
Idaho National Engineering and Environmental
Laboratory, Idaho (Innovative Grouting and Retrieval)
Idaho National Engineering and Environmental
Laboratory, Idaho (Polysiloxane Stabilization)
Idaho National Engineering and Environmental
Laboratory, Idaho (Amalgamation of Mercury using
the NFS DeHgSM Process)
Los Alamos National Laboratory, New Mexico
(Amalgamation of Mercury using the ADA Process)
Los Alamos National Laboratory, New Mexico
(Solidification/Stabilization - GTS Duratek Process)
Pacific Northwest National Laboratory, Washington
(Solidification/Stabilization - Sol Gel Process)
Technology Cost
($)W
C: $17,861
Not provided
PC: $2,000,000
PO: $6,5 10 per
cubic meter of waste
Not provided
PC: $2,000,000
PO: $5,940 per
cubic meter of waste
P: $19,000,000
(1-acre);
$64,000,000(4-acre)
Not provided
Not provided
Not provided
Not provided
P: $600,000 to
$1,000,000
Quantity of Media
Treated
Not provided
4.6 square meters
Not provided
Not provided
Not provided
Not provided
Not provided
75 kg of mercury
132kg of mercury
Not provided
Not provided
Quantity of
Contaminant
Remoyed
Not provided
Not provided
Not provided
Not provided
Not provided
Not provided
Not provided
Not provided
Not provided
1,253 Ibs of sludge,
3 containers of
laboratory wastes
Not provided
Calculated Unit Cost
for Treatment w
$1 .32 per square foot
$128 per square meter
Not provided
Not provided
Not provided
Not provided
$8 per pound ($573 per
cubic foot) of salt waste
P: $300 per kg (based on
treating more than 1,500
kg)
P: $300 per kg (based on
treating more than 1,500
kg)
Not provided
Not provided
Key Factors
Potentially Affecting
Technology Costs***
Size and depth of
concrete surface treated
Size and depth of
concrete surface treated
Salt loading in waste;
types and
concentrations of heavy
metals
Not provided
Salt loading in waste;
types and
concentrations of heavy
metals
Size of area treated;
physical and chemical
characteristics of waste
Salt loading in waste;
types and
concentrations of heavy
metals
Quantity of waste
treated (costs
prohibitive for small
quantities)
Quantity of waste
treated (costs
prohibitive for small
quantities)
Not provided
Salt loading in waste;
types and
concentrations of heavy
metals
17
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Table 2. Remediation Case Studies: Summary of Cost Data (continued)
Site Name, State (Technology)
Portsmouth Gaseous Diffusion Plant, Ohio
(Solidification/Stabilization)
Idaho National Engineering and Environmental
Laboratory, Idaho (Graphite Elctrode DC ARC
Furnace)
STAR Center, Idaho (Plasma Hearth Process)
Technology Cost
($)W
PC: 30,000
PO: $95 per hour
PC: $50 to $80
million
PO: $12 to $18
million (startup);
$48 to $62 million
(for 5yrs)
PC: $50 to 86.2
million
PO: $12 to $18
million (startup);
$48 to 62 million
(for 5 yrs)
Quantity of Media
Treated
160 kg of resin
Not provided
Not provided
Quantity of
Contaminant
Remoyed
Not provided
Not provided
Not provided
Calculated Unit Cost
for Treatment w
$1.73 per kg
P: $7,400 to $10,800 per
cubic meter (based on
17,000 cubic meters)
P: $7,400 to $10,800 per
cubic meter
Key Factors
Potentially Affecting
Technology Costs***
Types and
concentrations of heavy
metals
Physical characteristics
of waste (moisture
content); cost of power
Physical characteristics
of waste (moisture
content); cost of power
Actual full-scale costs are reported unless otherwise noted.
Cost abbreviation: AO = annual operation and maintenance (O&M) costs, C = capital costs, D = disposal costs, DEMO = demonstration costs, O = total O&M costs,
P = projected costs, Pilot = pilot-scale costs.
18
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IN SITU SOIL TREATMENT ABSTRACTS
19
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Cometabolic Bioventing at Building 719,
Dover Air Force Base, Dover Delaware
Site Name:
Dover Air Force Base, Building 719
Location:
Dover, Delaware
Period of Operation:
Propane acclimation period: December 1997 to April 1998
Bioventing operation: May 1998 to July 1999
Cleanup Authority:
CERCLA
Purpose/Significance of Application:
Field demonstration of in situ cometabolic bioventing to treat chlorinated
solvents in soil
Cleanup Type:
Field demonstration
Contaminants:
Chlorinated Solvents
Maximum concentrations of chlorinated aliphatic hydrocarbons (CAHs) in
soil found during site investigations were TCE (250 mg/kg); TCA (1,000
mg/kg); DCE (20 mg/kg)
Estimated mass of CAH in test plot - 26 pounds; TCA made up
approximately 70% of the total estimated mass of contaminants
Soil in the area is sand with varying amounts of clay, silt and gravel. Soil
permeability is 1.9xlO'7 to 7.0xlO'8 cm2.
Waste Source:
Discharges to a drainage ditch and
sanitary sewer; leaks from
underground and above ground tanks
Contacts:
EPA Remedial Project Manager:
Darius Ostrauskas
Remedial Project Manager
U.S. EPA Region 3
1650 Arch Street (3HS50)
Philadelphia, PA 19103
(215)814-3360
ostrauskas.darius@epa.gov
EPA Contact for Demonstration:
Dr. Gregory Sayles
U.S. EPA (mail stop 420)
26 W. Martin Luther King Drive
Cincinnati, OH 45268
(513)569-7607
Fax:(513)569-7105
E-mail: sayles.gregory@epa.gov
Technology:
In Situ Bioremediation; Cometabolic Bioventing
Test plot - approximately 30 ft long, 20 ft wide, and 10 ft deep with a volume
of 4,500 ft3 of soil
Three injection wells, screened to a depth of 10 ft bgs
A blower and a mass flow controller were used to inject a mixture of air and
propane (300 ppm in air) through the three wells at a rate of 1 cfm
13 soil gas monitoring points to monitor soil gas conditions throughout the
demonstration. Each soil gas monitoring point was equipped with two gas
probes (one at a depth of 4-5 ft and one at a depth of 8-9 ft bgs); an additional
11 "temporary" soil gas monitoring points were used during initial air
permeability testing, and during system operation, to monitor soil gas
Type/Quantity of Media Treated:
Soil/ 450,000 Ibs, based on an assumed density of 100 lbs/ft3
Regulatory Requirements/Cleanup Goals:
The objectives of the pilot test included evaluating in situ cometabolic bioventing to treat chlorinated solvents in soil and
to collect data for potential full-scale application of the technology at the site
Results:
After 14 months of operation, concentrations of TCE, TCA, and DCE were reduced in the soil in the test area
Reductions included TCE from >10 mg/kg to <0.25 mg/kg; TCA from >100mg/kg to <0.5mg/kg; and DCE from
>20mg/kg to <0.25mg/kg
Costs:
Not provided
20
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Cometabolic Bioventing at Building 719,
Dover Air Force Base, Dover Delaware
Description:
Dover Air Force Base (AFB), located in Dover, Delaware, is a 4,000 acre military installation that began operating in
1941. Building 719 is a jet engine inspection and maintenance shop where a variety of materials, including solvents and
fuel, were used un base operations. Until the mid-1960s, wastes from the shop were discharged to a drainage ditch and
sanitary sewer. During site investigations, leaking tanks were identified in the area to the northeast of the shop, and soil
and groundwater at the site was found to be contaminated with chlorinated solvents. Dover AFB was listed on the
National Priorities List in March 1989. As part of the interim ROD for the site, a pilot test of in situ cometabolic
bioventing was conducted at Building 719 to evaluate the ability of the technology to remove CAHs. The test plot
selected for the pilot study was an area contaminated with high concentrations of CAHs. Prior to the pilot test, laboratory
tests were performed on soils from the test plot area to evaluate candidate substrates. Propane was selected because of its
ability to stimulate cometabolic activity towards both TCA and TCE.
The bioventing system used for the pilot test included three injection wells, screened to a depth of 10 ft bgs, which was
the lowest expected water table elevation. In addition, soil gas conditions were monitored throughout the demonstration
using soil gas monitoring points. In situ cometabolic bioventing was successful in reducing CAH concentrations in test
plot soils. After 14 months of operation, TCE and DCE were reduced to concentrations of less than 0.25 mg/kg, and TCA
was reduced to concentrations of less than 0.5 mg/kg. According to the researchers for the pilot test, results of laboratory
treatability testing identified propane as a useful cosubstrate for driving the cometabolism of TCE and TCA.
21
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Bioventing at Multiple Air Force Test Sites
Site Name:
Multiple Air Force Test Sites (145 total; refer to case study for names and
locations of each test site)
Location:
Multiple locations throughout U.S.
Period of Operation:
Overall program: April 1992 to December 1995
Each test: varied by site; typical operation about one year
Cleanup Authority:
Sites are being addressed under
CERCLA, RCRA, and state
underground storage tank programs
Purpose/Significance of Application:
Major initiative to demonstrate the feasibility of bioventing to remediate
petroleum-contaminated soil at 145 Air Force sites
Cleanup Type:
Pilot scale
Contaminants:
Benzene, Toluene, Ethylbenzene, and Xylenes (BTEX) and Total Petroleum
Hydrocarbons (TPH)
Data provided for average initial concentrations of BTEX and TPH in soil
and soil gas (based on 328 samples from 100 test sites)
Average BTEX constituent concentrations in soil (soil gas) - benzene -106
mg/kg (88 ppmv); toluene - 250 mg/kg (13 ppmv); ethylbenzene - 276 mg/kg
(64 ppmv); xylenes -1,001 mg/kg (46 ppmv)
Average TPH concentration in soil - 3,301 mg/kg; Total Volatile
Hydrocarbons (TVH) in soil gas - 22,555 ppmv
Waste Source:
Leaks from underground storage
tanks, including tanks used to store
gasoline, JP-4, diesel fuel, heating
oils, and waste oils
Contacts:
Air Force Contact:
Lt. Col. Ross N. Miller
U.S. Air Force Center for
Environmental Excellence
Brooks, AFB
Texas
Telephone: 210-536-4331
Technology:
In Situ Bioventing
Specific configuration varied by site for number, depth of vent (air injection)
wells, number of monitoring wells, and blower size and type
Typical configuration included vent wells (1 to 9 per site; depths -7 to 233
feet below ground surface); vapor monitoring wells (1 to 6 per site); blower
(1 to 5 horsepower; either rotary vane or regenerative)
Horizontal vent wells used at five sites
Type/Quantity of Media Treated:
Soil
Quantities treated at each test site ranged from 200 to more than 270,000
cubic yards; based on radius of influence of vent well(s) at each site
Soil gas permeability - about 20% of the test sites contained greater than 50%
silt and clay fractions; the radius of oxygen influence from a single vent well
was equal to or greater than the contaminated area at about 50% of the test
sites
Soil pH - pH ranged from 5 to 9 at the majority of sites
Soil moisture - ranged from 5% to 20% at the majority of sites
Total Kjeldahl nitrogen - ranged from <50 to 200 mg/kg at the majority of
sites
Soil temperature - not measured at each site; soil temperatures between 0ฐC
and 25 ฐC observed at test sites
Regulatory Requirements/Cleanup Goals:
The objectives of the bioventing initiative included documenting the ability of bioventing to remediate petroleum-
contaminated soils in a variety of conditions, and obtaining a significant set of bioventing data
No specific cleanup goals were identified for the test sites
22
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Bioventing at Multiple Air Force Test Sites
Results:
Results from data collected after one year of bioventing (328 sampling locations at 100 sites):
Average reduction in BTEX concentrations of 97% in soil and 85% in soil gas; average TPH concentrations reduced by
24% in soil; average TVH concentrations reduced by 90% in soil gas
Biodegradation rates measured at the test sites - at start of test ranged from <300 mg/kg/yr to >6000 mg/kg/yr; average
1,200 mg/kg/yr
Average biodegradation rate decreased to 700 mg/kg/yr, as a result of the decreasing bioavailability of hydrocarbons
over time
Bioventing was effective in a variety of climate conditions, ranging from 0ฐC in Alaska to 25 ฐC in California; higher
biodegradation rates were observed in warmer climates
A combination of high moisture content and fine-grained soils made bioventing infeasible at only two of the 145 test
sites
Costs:
The average actual cost for design, installation, and 1-year of operation of pilot-scale bioventing at a single vent well
site was $60,000
The projected cost of full-scale bioventing generally ranges from $ 10 to $60 per cubic yard of soil treated
At sites with more than 10,000 cubic yards of contaminated soil, costs are less than $10 per cubic yard; at sites with
less than 500 cubic yards of contaminated soil, costs are greater than $60 per cubic yard
Projected costs for a typical full-scale bioventing system (defined as an Air Force site with 5,000 cubic yards of soil
contaminated with 3,000 mg/kg of JP-4 fuel; bioventing system consisting of four vent wells at a depth of 15 feet,
operated for two years) - $92,300, including $27,000 for pilot testing and $27,500 for full-scale construction
Description:
In April 1992, the Air Force Center for Environmental Excellence (AFCEE), in cooperation with the Air Force Armstrong
Laboratory and the U.S. Environmental Protection Agency, began an initiative to demonstrate the feasibility of using
bioventing to remediate petroleum contaminated soils in a variety of climatic, soil, and contaminant conditions. Between
April 1992 and December 1995, initial bioventing tests were conducted at 145 Air Force sites throughout the country.
The pilot-scale systems included vent (air injection) wells, monitoring wells, and blowers. The specific configuration
varied by test site, and horizontal vent wells were used at five of the sites. Concentrations of BTEX and TPH were
measured in soil and soil gas from over 300 sampling locations at 100 sites at the start of bioventing operations and after
one year of operation. Results showed that bioventing was effective in reducing concentrations of BTEX and TPH in soil
and soil gas in a variety of site conditions. Soil BTEX and TPH concentrations were reduced by 97% and 24%,
respectively. Soil gas BTEX and TVH concentrations were reduced by 85% and 90%, respectively. According to the
Air Force, the reductions in BTEX are sufficient to meet the most conservative EPA risk-based cleanup criteria for soils,
and regulatory acceptance of this technology was obtained in 38 states and the 10 EPA regions. The pilot-scale systems
have been converted to full-scale systems at about half of the test sites, saving the Air Force an estimated $5 to $ 10
million in design and construction costs.
23
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In Situ Gaseous Reduction System Demonstrated at White Sands Missile Range,
New Mexico
Site Name:
White Sands Missile Range, SWMU 143
Location:
NM
Period of Operation:
April - June 1998
Cleanup Authority:
Not identified
Purpose/Significance of Application:
Demonstrate use of injection of H2S for in situ reduction of hexavalent
chromium
Cleanup Type:
Field demonstration
Contaminants:
Heavy metals
Cr6+
Waste Source:
Spills
Contacts:
Technical Contacts:
Ed Thornton
Pacific Northwest National
Laboratory (PNNL)
(509) 373-0358
DOE Contacts:
Jim Hanson
DOE EM50
(509) 372-4503
James A. Wright
DOE SRS
(803) 725-5608
Technology:
In Situ Gaseous Reduction (ISGR)
ISGR involves injection of a low concentration H2S gas mixture (100-200
ppmv) into soils, where it reacts with oxidized metals such as Cr6+ and
uranium, followed by extraction of gas containing reduced metals, such as
Cr3+
System included an injection pump, extraction pump, water knockout tank,
scrubber, one central injection well, and six extraction wells; wells were
completed to approximately 20 ft bgs
Treatment progress was measured by breakthrough of H2S at the extraction
wells
Type/Quantity of Media Treated:
Soil (in situ)
Regulatory Requirements/Cleanup Goals:
Objectives of demonstration were to provide technical and cost information about ISGR; obtain operational
information; and determine site air flow characteristics
No specific cleanup goals were identified
Results:
After completion of the demonstration, soil samples were collected from nine boreholes; these results showed that
nearly all the Cr6+ in the interval from 4 -10 ft bgs was reduced - this zone contained clean white gypsum sand that
initially contained the highest concentrations of Cr6+
The mass of Cr6+ did not change appreciably in the 10-16 ft bgs interval, which contained a brownish sand containing
gypsum plus clay
These results suggested that the effectiveness of ISGR is limited by subsurface heterogeneities, with channeling of the
injected gases in the most permeable white sand
Comparison of pre- and post-demonstration soil samples showed that >70% of the Cr6+ mass was reduced, and all post-
treatment samples had <30 mg/kg of Cr6+
Costs:
Projected costs for a full-scale application of ISGR were a total cost of $798,163, or $43/yd3
Projected unit for ISGR were estimated to range as high as $ 100/yd3, depending on the size of the waste site
24
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In Situ Gaseous Reduction System Demonstrated at White Sands Missile Range,
New Mexico
Description:
The White Sands Missile Range lies within the Mexican Highland Section of the Basin and Range Province.
Contamination was discovered at SWMU 143 in January 1990 when greenish-yellow soil was found in a corner of the
equipment yard. A review of facility records indicated that several 5 5-gallon drums of Entec 300 had spilled directly onto
the ground in 1982 or 1983.
In a cooperative effort between DOE and DoD, ISGR was demonstrated at this site in the spring and summer of 1998.
The technology involved injecting 200 ppm H2S mixture into chromate-contaminated soils. Results showed that >70% of
the Cr6+ in the soil was reduced to Cr34" during the demonstration, and that all post-treatment soil samples had <30 mg/kg
of Cr6+. The amount of H2S consumed during the test was greater than the amount predicted in laboratory studies, and is
likely due to interfering reactions in the field or slower reaction kinetics. A life-cycle cost analysis suggested that ISGR
should be a less expensive remedy than excavation, especially for sites where the depth of contamination is more than 15 -
20 ft bgs. During FY 1999-2000, a deployment is planned at the DOE Hanford site to remediate Cr6+-contaminated soils
in the 100 Area.
25
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Electrokinetics at an Active Power Substation (Confidential Location)
Site Name:
Active Power Substation (Confidential Location)
Period of Operation:
Summer 1998 (6 month pilot-scale study)
Purpose/Significance of Application:
First field demonstration of electrokinetic remediation in the U. S. by
Electrokinetics, Inc.
Contaminants:
Heavy Metals
Arsenic concentrations ranged from 1-1,400 mg/kg
Contacts:
Vendor:
Laurie LaChiusa
Vice President
Electrokinetics, Inc.
1 1552 Cedar Part Avenue
Baton Rouge, LA 70809]
Telephone: (225) 753-8004
E-mail: ekinc@pipeline.com
Location:
Southern U.S.
Cleanup Authority:
Not identified
Cleanup Type:
Field demonstration
Waste Source:
Herbicide use
Technology:
Electrokinetics
Pilot-scale testing was conducted in two adjacent treatment cells - one for
arsenic extraction and one for arsenic stabilization - each measuring 30 ft
long by 20 ft wide by 3 1 ft deep (18,600 ft3)
Each treatment cell had three anodes spaced 10 ft apart and one cathode
located 30 ft from the middle anode; the cathode was made of carbon steel
and inserted to a depth of 3 1 ft
In the first cell, a depolarizing agent was pumped in at the cathode to create a
neutral to slightly basic catholyte
In the second cell, proprietary reactive anodes were used to inject an arsenic-
binding compound into the soil mass
The first cell (extraction) required 80 kW-hr per yd3; the second cell
(stabilization) 74 kW-hr per yd3; for each cell, the pH was 5 and moisture
content was 25%
Prior to the pilot-scale tests, bench-scale studies were conducted using soil
samples from several substation sites located in the southeastern U.S.
Type/Quantity of Media Treated:
Soil
Silty sands without heavy clay
Soil properties include pH of 5 and hydraulic conductivity of 6 x 10"5 cm/sec
Regulatory Requirements/Cleanup Goals:
Assess the performance of extraction and stabilization systems, and determine which configuration would yield the best
results for extracting arsenic and preventing off-site migration
Results:
Bench-scale test results showed that >99% of arsenic was extracted; tests of arsenic -binding compounds showed that
soil passed both the TCLP and SPLP teachability tests
A final report for the pilot-scale demonstration had not yet been submitted, and performance results are not available
for release to the public
Results are expected to be available in the first quarter of 2000
Costs:
Cost data are not yet available for release to the public; these are expected to be
available in the first quarter of 2000
26
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Electrokinetics at an Active Power Substation (Confidential Location)
Description:
A large southern U.S. power company performed bench- and pilot-scale studies of electrokinetic extraction and
electrokinetic stabilization for selected arsenic contaminated sites. After extensive analysis of both the results of bench-
scale studies on representative soils and site conditions at several substations, one active power substation site
(confidential location) was selected for pilot-scale electrokinetic treatment. Both electrokinetic extraction and
electrokinetic stabilization configurations were explored at this site.
The pilot-scale demonstration was performed using one treatment cell for arsenic extraction, that used a depolarizing
agent, and one cell for arsenic stabilization, that used proprietary reactive anodes. Results from the bench-scale tests
showed extraction of >99% of the arsenic from the soil, and that soil passed both TCLP and SPLP teachability tests.
Results from the pilot-scale tests are expected to be made available in the first quarter of 2000.
27
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Electrokinetics at Site 5, Naval Air Weapons Station Point Mugu, California
Site Name:
Naval Air Weapons Station Point Mugu, Site 5
Location:
Point Mugu, California
Period of Operation:
March 1998 - June 1999
Cleanup Authority:
Not identified
Purpose/Significance of Application:
Field demonstration of electrokinetics for treatment of metals in a sandy soil
Cleanup Type:
Field demonstration
Contaminants:
Heavy metals
Total concentrations of chromium up to 25,100 mg/kg and cadmium up to
1,810 mg/kg
TCLP concentrations of chromium were nondetect and cadmium were 10.5
mg/L
Waste Source:
Lagoons used for wastewater
discharges from electroplating and
metal finishing activities
Contacts:
Technology Researcher:
Gene L. Fabian
Mechanical Engineer
US Army Environmental Center
Attn: SFIM-AEC-ETD
5179HoadleyRoad
APG-EA, MD 21010-5401
Telephone: (410) 436-6847
E-mail:
gene.fabian@aec.apgea.army.mil
Vendor:
Lynntech, Inc.
Technology:
Electrokinetics
Two 1/8-acre test cells; one cell (#1) contained the two former waste lagoons
and the surrounding berms, and was an artificially confined treatment area
The second cell (#2) was an unconfined treatment area that was open to
groundwater and tidal effects
Operations within test cell #2 were never initiated due to performance
problems observed in cell #1
An electrically nonconductive sheet pile barrier wall was installed to a depth
of 20 feet around the perimeter of cell #1
Three rows of anode wells and two rows of cathode wells were installed to a
depth of 10 ft; initial current density was 0.2 mA/cm2
By 5/98 (3 months of operation), the size of the test area was reduced (1/16
acre), and the current density was increased from 0.2 mA/cm2 to more than
0.33 mA/cm2
In 10/98 (22 weeks of operation), the field demonstration was temporarily
suspended
From January to June 1999, system operation resumed in a further reduced
area (approximately 500 ft2)
Type/Quantity of Media Treated:
Soil
Soil type was sandy soil and sediment, with 85% sand, 7% gravel, 6% silt,
and 1% clay
Soil properties included pH of 5.84, total organic carbon of 6,390 mg/kg,
hydraulic conductivity of 0.045 cm/sec, and cation exchange capacity of 3.9
Regulatory Requirements/Cleanup Goals:
Metals - meet TCLP levels and California state total threshold limit concentration, and soluble threshold limit
concentration levels
Results:
Analytical results of multiple soil and pore fluid samples were used to track the movement of heavy metals over time
October 1998 results indicated that chromium was migrating towards the cathode
June 1999 results indicated that cadmium was moving toward the surface and towards the cathode region, and that
chromium was moving toward the cathode region
During the demonstration, elevated levels of trihalomethanes and free chlorine were found in the electrolyte solutions
28
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Electrokinetics at Site 5, Naval Air Weapons Station Point Mugu, California
Costs:
Not provided
Description:
The U.S. Army Environmental Center and the Engineer Research and Development Center of Waterways Experiment
Station conducted a field demonstration of electrokinetics at a metal-contaminated site at Site 5 of Naval Air Weapons
Station Point Mugu, California. NAWS Point Mugu comprises approximately 4,500 acres, and is located approximately
50 miles northwest of Los Angeles. Site 5, the Old Area 6 Shops, is a large area where electroplating and metal finishing
operations were conducted. The area of study was approximately one-half acre in and around two former waste lagoons
located in the center of Site 5. The lagoons are unlined and were used between 1947 and 1978 to receive wastewater
discharge from electroplating and metal finishing activities. Prior to the field demonstration, extensive laboratory testing
was conducted to assess the potential effectiveness of electrokinetic extraction at NAWS Point Mugu.
Results from laboratory studies showed that electrokinetics could successfully be applied to the demonstration site at
NAWS Point Mugu. During the demonstration, electrokinetics increased the mobility of cadmium and chromium at this
site. Operation of the electrokinetic extraction system at the NAWS Point Mugu site is continuing to identify and further
assess the factors that limit the performance of the technology. According to USAEC, at its current stage of development,
this technology is not considered to be sufficiently developed to be considered as a commercially available technology.
Issues to be resolved prior to full-scale commercialization include formation of trihalomethanes; effects on naturally
occurring ions; a methodology for predicting treatment performance; electrode design and its effects on electric field
shape and intensity; and a methodology for determining the configuration of the electrodes under field conditions.
29
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Electrokinetic Extraction at the Unlined Chromic Acid Pit, Sandia National
Laboratories, New Mexico
Site Name:
Sandia National Laboratories (SNL), Unlined Chromic Acid Pit
Period of Operation:
May 15 to November 24, 1996
Purpose/Significance of Application:
The first field demonstration of electrokinetics for removal of contaminant ions
from arid soil
Contaminants:
Heavy metals (chromium)
Total chromium concentrations were measured in soil as high as 200 mg/kg,
up to 17 ftbgs
TCLP chromium concentrations were measured in soil as high as 28 mg/L
Contacts:
Technology Researcher:
Dr. Eric R Lindgren
Sandia National Laboratories
P.O. Box 5800
Albuquerque, NM 87185-0719
Telephone: (505) 844-3820
E-mail: erlindg@sandia.gov
Location:
New Mexico
Cleanup Authority:
Not identified
Cleanup Type:
Field demonstration
Waste Source:
Waste pit
Technology:
Electrokinetics
SNL's patented electrode - constructed of a porous, ceramic outer casing and
an inner, iridium-coated titanium electrode; extracts contaminants by moving
them into water held under tension (a partial vacuum) inside the outer casing
For demonstration, three rows of electrodes in 144 ft2 area; center row - five
anodes; outer two rows - each five cathodes
Voltage applied between electrodes - 1,572 kW hrs total; current applied to
each electrode was about 15 amps
Additional components included a liquid control system, a vacuum control
system, a power application system, and a monitoring system
Type/Quantity of Media Treated:
Soil
Near surface geology consists of alluvial fan deposits with some eolian
deposits
Sediments consist of intercalated fine-to-coarse grained, well-sorted to
poorly-sorted sands, gravels, and cobbles
Water table located 485 ft bgs
Soil moisture content about 10 weight percent; conductivity is <10 mS/m
Regulatory Requirements/Cleanup Goals:
Demonstrate extraction of chromate from unsaturated soils without addition of significant amounts of water
Results:
13 tests were performed in the demonstration (12 operating conditions; 1 system performance testing)
A total of approximately 600 grams of hexavalent chromium were removed from the soil after 2700 hours of operation
(0.22 g/hr)
At the system's preferred operating conditions, approximately 200 grams of hexavalent chromium were removed during
700 hours of operation (0.29 g per hour)
After treatment, soil samples adjacent to the cathodes had total chromium concentrations of 72 ppm and TCLP
concentrations less than 5 mg/L
Addition of significant amounts of water was not required
Costs:
Not provided
30
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Electrokinetic Extraction at the Unlined Chromic Acid Pit, Sandia National
Laboratories, New Mexico
Description:
Sandia National Laboratories (SNL) is located southeast of Albuquerque, New Mexico, within the boundaries of Kirtland
Air Force Base. The Unlined Chromic Acid Pit is located in the Chemical Waste Landfill at SNL, which is located in
Technical Area III. The chromium disposed of in the Unlined Chromic Acid Pit was in the form of chromic sulfuric
acids. A chromium plume resides in the vadose (unsaturated) zone beneath the pit, with the most contaminated horizon
beneath the pit containing concentrations of chromium higher than 200 mg/kg.
A field demonstration of in situ electrokinetic extraction technology was conducted at the Unlined Chromic Acid Pit to
show that chromate could be extracted from unsaturated soils on a field scale without the addition of significant amounts
of water. The field demonstration targeted the floor of the former pit at a horizon 8 to 14 feet below the surface, with
three rows of electrodes placed in a 12-foot by 12-foot area. Test results met the goal, with the soil samples adjacent to
the cathodes showing total chromium concentrations of 72 ppm and TCLP concentrations less than 5 mg/L. In addition,
the electrokinetic process was found to be stable over long periods of time. While SNL's electrokinetic extraction system
was successful in removing chromium from unsaturated sandy soil, SNL noted that the electrode system was a research
prototype and was not specifically engineered for commercialization. After the 1996 field demonstration, SNL began
developing a passive system, where the system is operated at a lower power, thereby avoiding the expense of actively
cooling the electrokinetic electrode system. The new system uses a solid matrix capture system, eliminating the need for
the liquid control and vacuum systems.
31
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In-Situ Thermal Desorption at the Former Mare Island Naval Shipyard, California
Site Name:
Former Mare Island Naval Shipyard
Location:
California
Period of Operation:
September to December 1997
Cleanup Authority:
California EPA
Purpose/Significance of Application:
Field demonstration of in situ thermal desorption to treat PCBs in shallow and
deep contaminated soils
Cleanup Type:
Field demonstration
Contaminants:
PCBs
PCB levels were measured as high as 2,200 mg/kg, with an average of 220
mg/kg during a RI
Waste Source:
Contaminated wash water discharged
to soil
Contacts:
Vendors:
Mr. Gary R. Brown, P.E.
Project Oversight Manager
RT Environmental Services, Inc.
215 West Church Road
King of Prussia, PA 19406
Telephone: 610-265-1510
Fax 610-265-0587
Email: grbrwn@aol.com
Mr. Vince Fredrick, Project Manager
TerraTherm Environmental Services,
Inc.
19510 Oil Center Blvd.
Houston, TX 77073
Telephone: 281-925-0400
Fax: 281-925-0480
Email: vfredrick@terratherm.com
U.S. Navy Contacts:
Mr. Ken Spielman
EFA West, NAVFAC
Code 182
900 Commodore Drive
San Bruno, CA 94066
Telephone: 650-244-2539
Fax: 650-244-2553
Email:
khspielman@efawest.navfac.navy.mil
Mr. Chris Lonie
EFD Pacific
Env Restoration 258 Makalapa Dr
Pearl Harbor 96860-3134
Telephone: 808-474-5962
Email:
LonieCM@efdpac.navfac.navy.mil
Technology:
In-Situ Thermal Desorption (ISTD)
Two demonstrations were conducted - a thermal well and a thermal blanket -
using the MU-125 (125 cfm capacity) unit
12 thermal/vapor extraction wells, installed to a depth of 14 ft bgs and
screened from 6 inches to 14 ft, used to treat deeper soil
Two thermal blankets used to treat shallow soils
Emissions control system included a flameless thermal oxidation unit, a heat
exchanger, and GAC augmented with pelletized calcium hydroxide
Heating was conducted for a total of 35 days (over a period of 3 months) to
reach the target temperature of 600 ฐF at four central monitoring locations
Process flow rates ranged from 38 to 82 scfm
Type/Quantity of Media Treated:
Soil
Aquifer material - siltstone/fine-grained sandstone
Groundwater depth - approximately 9 feet to 15 feet bgs
Moisture content - approximately 20%
Porosity - approximately 30%
32
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In-Situ Thermal Desorption at the Former Mare Island Naval Shipyard, California
Regulatory Requirements/Cleanup Goals:
The primary performance objective for the demonstration was to treat PCBs in soil to a concentration of less than 2
mg/kg
Off-gas limits included an HCL emission rate limit of 4.0 Ibs/hr
Results:
All post-treatment samples had total PCB concentrations below the quantitation limit (10 ug/kg) and met the
performance objective of <2 mg/kg
On average, the thermal wells reduced total PCBs from 53,540 ug/kg to <10 ug/kg, to a 12 ft depth
On average, the thermal blankets reduced total PCBs from 20,607 ug/kg to <10 ug/kg, to a 1 ft depth
The HC1 emission rate limit of 4.0 Ibs/hr was not exceeded during the demonstration
CO emissions were below 10 ppmV with a mean concentration of approximately 2 ppmV
Total hydrocarbon emissions ranged from 0 to 8 ppmV with a median discharge rate of less than 0.002 Ib/hr as CH4
Excess oxygen was > 12%, except during the change over to the thermal blanket
Costs:
Actual construction and operating costs for this project are not available
Depending on site-specific factors, the vendor has established an overall cost range of approximately $100 to $250 per
ton
Description:
The Former Mare Island Naval Shipyard includes an electrical workshop, known as Building 866, which was used from
1955 to 1994. From 1955 to 1978, transformers washed in the workshop contained polychlorinated biphenyl (PCB) oils,
which were drained and washed into a 30-gallon sump through floor grates and drains. The liquid waste and sludge that
accumulated in the sump were pumped to a 3,000 gallon grease trap near the western corner of the building. The test site
was located in the area of the former grease trap and adjacent paved areas located at the northwest corner of Building 866.
Levels of PCBs as high as 2,200 mg/kg were identified at the site during the remedial investigation. A demonstration of
In-Situ Thermal Desorption (ISTD) using thermal blankets and thermal wells was conducted in this area by the U.S. Navy
and the Bay Area Defense Conversion Action Team (BADCAT) Environmental Technology Project (ETP).
ISTD is a combination of thermal desorption and vacuum extraction, and is conducted in-situ. Two demonstrations were
conducted (thermal well and thermal blanket) and were found to be effective in treating PCB impacted soils, achieving the
performance objective of 2 mg/kg. The results of the demonstrations suggested minor modifications in well heater
materials, control, and monitoring to aid in more even soil heating and extend heater life and efficiency. The heater
failures experienced on this project were attributable to the use of 316 stainless steel heater strips (rather than 310
stainless steel), and the initially high operating temperature of heaters.
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Soil Vapor Extraction Enhanced by Six-Phase Soil Heating at Poleline Road
Disposal Area, Fort Richardson, Alaska
Site Name:
Poleline Road Disposal Area (PROA), Operable Unit B
Location:
Fort Richardson, Alaska
Period of Operation:
Treatability Study - July through December 1997
Cleanup Authority:
CERCLA and State
Record of Decision (ROD) date
August 8, 1997
Purpose/Significance of Application:
Treatability study of SVE enhanced with SPSH to treat soil contaminated with
VOCs.
Cleanup Type:
Treatability study
Contaminants:
Organic Compounds
Volatiles (halogenated)
- 1,1,2,2-Tetrachloroethane (TCA)
- Tetrachloroethene (PCE)
- Trichloroethene (TCE)
- Maximum concentrations: 2,030 mg/kg TCA, 159 mg/kg PCE, 384 mg/kg TCE
Waste Source:
Chlorinated solvents were used
as a carrier for neutralization
chemicals after burning of
materials in disposal trenches
Contacts:
Project Management:
USACE, Alaska District
P.O. Box 898
Anchorage, Alaska 99506-0898
Kevin Gardner
US Army, Dept of Public Works
Fort Richardson, Alaska
(907)384-3175
Vendor:
David Fleming
Current Environmental Services
P.O. Box 50387
Bellevue, Washington 98015
(425) 603-9036
david@cesiweb.com
http://cesiweb.com/index.cfm
Regulatory Contacts:
Lewis Howard
Alaska Department of Environmental
Conservation
555 Cordova
Anchorage, Alaska 99501
(907) 269-7552
Lhoward@envircon.state.ak.us
Matt Wilkening
US EPA Region 10
1200 6th Street
Seattle, Washington 98101
(206) 553-1284
wilkening. matt@epamail. epa.gov
Technology:
Soil Vapor Extraction (SVE) with Six-Phase Soil Heating (SPSH)
Electrical power was delivered to the soil by steel electrodes inserted
vertically in a circular array. Each electrode served as an SVE vent
Electric current passed through the soil creating steam and contaminant
vapors
A blower pulled soil vapors from the SVE vents and through a knockout tank
to a condenser
The condenser cooled and condensed hot vapors and separated the gas and
liquid phases
The gas phase passed through a knockout tank and was discharged to the
atmosphere
The liquid stream was treated by air stripping and was discharged on site
Type/Quantity of Media Treated:
3,910 cubic yards or 7,150 tons of soil in situ
Soil Moisture Content: 7.3 - 13.9%
Air Permeability (within the soil volume): 1.6 x 10
Soil Porosity: 21 ^27%
cm
34
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Soil Vapor Extraction Enhanced by Six-Phase Soil Heating at Poleline Road
Disposal Area, Fort Richardson, Alaska
Regulatory Requirements/Cleanup Goals:
System performance was evaluated against three primary criteria:
1. The ability of each of the three six-phase heating arrays to heat soil in-situ
2. Demonstrated removal of contaminants, as measured in the condenser off-gas and condensate
3. Demonstrated reduction of soil contamination, as measured in the pre- and post-treatment soil samples
The air stripper effluent was compared to the Alaska maximum contaminant levels (MCLs) for drinking water
Results:
The treatability study met all of the criteria established for system performance
The air stripper effluent met Alaska MCLs
Costs:
The total cost for this project was $967,822
The total cost for treatment ranged from $189 to $288 per CY ($103 to $158 per ton) of soil. The soil treatment costs
ranged from $726 to $2,552 per pound of contaminant removed
The large power requirement of the treatment equipment was a significant operating cost because the site was in a
remote location and power was provided by diesel generators
Description:
The PRDA was active from approximately 1950 to 1972. Chlorinated solvents were used as a carrier for neutralization
chemicals that were applied after burning of materials in disposal trenches. These materials included chemical warfare
agents, smoke bombs, and Japanese cluster bombs (detonated prior to burial). Four disposal areas have been identified in
an area encompassing approximately 1.5 acres. Two solvents, TCA and TCE, were found in higher concentrations and
over a larger area than any other chemicals detected. PCE was also detected above action levels. A 1996 treatability study
at the PRDA concluded that SVE was capable of removing solvent vapors from the subsurface, but at a rate that would
require more than 10 years of treatment. Based on these results, it was recommended that SVE treatment enhanced with
in-situ soil heating could be used at the site as a means for completing treatment more rapidly.
A treatability study was conducted between July and December 1997 to evaluate SVE enhanced by SPSH. Three arrays
were constructed and operated at PRDA. Two arrays were 27 feet in diameter and one array was 40 feet in diameter.
Each array was operated for six weeks after a shakedown period. The smaller arrays demonstrated over 90% removal of
soil contaminants; the larger array demonstrated over 80% removal of contaminants. These results indicated that there
may be limitations to the size of the array that can effectively treat soil at a particular site. The size of the array is limited
by the resistivity of the soil and power requirements.
35
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Phy to remediation at Argonne National Laboratory - West, Waste Area Group 9,
Operable Unit 9-04, Idaho Falls, Idaho
Site Name:
Argonne National Laboratory - West, Waste Area Group 9, Operable Unit 9-04
Location:
Idaho Falls, Idaho
Period of Operation:
May to October 1998
Cleanup Authority:
CERCLA
ROD dated 9/29/98
Purpose/Significance of Application:
Bench-scale testing of phytoremediation to treat heavy metals in soil
Cleanup Type:
Bench scale
Contaminants:
Heavy metals
Contaminants of concern included chromium, mercury, selenium, silver, and
zinc.
Soil concentrations are 44.85 mg/kg Cr, <1.5 mg/kg total Hg, and 56.32
mg/kg total Zn
Waste Source:
Scientific and engineering research
activities
Contacts:
Technology Provider:
Ray Hinchman/M. Cristina Negri
Argonne National Laboratory
9700 S. Cass Avenue
ES-Bldg 362
Argonne, IL 60439
Telephone: (630) 252-3391/9662
E-mail:
hinchman@anl. gov/negri@anl. gov
Site Contact:
Scott D. Lee
Argonne National Laboratory - West
P.O. Box 2058
Idaho Falls, ID 83403-2528
Telephone: (208) 533-7829
Technology:
Phytoremediation
Greenhouse experiments were performed using contaminated soil and clean
sand
Three candidate plant species were tested: Prairie Cascade hybrid willow;
canola; and kochia
For the soil experiment, the soil was spiked with EDTA and citric acid
For the sand experiment, the soil was spiked with metals (soluble forms of
Cr, Zn, Hg, Ag, and Se)
Type/Quantity of Media Treated:
Soil
Site is a relatively flat, semi-arid, sagebrush desert
Climate conditions are a temperature range of 7.9ฐF - 84.8ฐF; a growing
season of April to mid-October; and annual average precipitation of 8.7
inches
Soil texture is loam, with particle size distribution of 47% sand, 34.6% silt,
18.4% clay
Soil composition is 1.59% organic matter, 5.41% lime, 5,310 mg/kg
extractable Ca, 510 mg/kg extractable Mg, 76 mg/kg extractable Na, 438
mg/kg extractable K, 48 mg/kg extractable P, 71 mg/kg soluble SO4, and 76
mg/kg soluble Na; soil pH is 8.57
Regulatory Requirements/Cleanup Goals:
Determine uptake rates and metal concentration factors for each plant species
Determine the most effective, non-hazardous chelating agent to increase the availability of metals from impacted soils
Evaluate potential maximum uptake of metals by candidate plant species under selected conditions
Results:
The optimum formulation of chelating agents for treating the metals was determined to be a 0.05 molar solution of 40%
EDTA and 60% citric acid
In the sand experiment, the best recovery levels for zinc, chromium, mercury, and silver were found in the willow with
96%, 38%, 42%, and 24% recovery, respectively
Testing using actual soils yielded significantly lower removals than with the sand experiment; the amount of zinc and
chromium removed was 4-5% and 2%, respectively
The willow roots had better removal of the metals than either kochia or canola
It was concluded that willows would be used in the field; possible removal rates of up to 14% of Zn and 3 to 4% Cr per
year were predicted, which could result in cleanup times between 6-7 years for Zn and 9 years for Cr
36
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Phy to remediation at Argonne National Laboratory - West, Waste Area Group 9,
Operable Unit 9-04, Idaho Falls, Idaho
Costs:
Use of phytoremediation at full-scale for four sites at ANL-W was projected to cost $2,247,000, including management
- $528,000; documentation - $98,000; construction - $841,000; and O&M - $780,000
The construction cost consisted of an initial 2-year field test at $300,000 and a contingency of $542,000 for five
additional years of phytoremediation
Description:
The Idaho National Engineering and Environmental Laboratory (INEEL), located in Idaho Falls, Idaho, is a government
facility managed by the U.S. DOE. Various sites at ANL-W are contaminated with wastes generated from the scientific
and engineering research at ANL-W and contain various levels of petroleum products, acids, bases, PCBs, radionuclides,
and heavy metals. The ROD for Waste Area Group 9 identifies seven areas that will undergo remediation and identifies
phytoremediation as the remedy, with a contingent remedy of excavation and disposal. As a pre-condition for
implementing phytoremediation in these areas, bench scale (laboratory and greenhouse) tests were performed to evaluate
the applicability of phytoremediation as well as to determine operating parameters and time frames for full-scale
implementation
The bench-scale tests were conducted in a greenhouse using contaminated soil and sand that was spiked with metals.
Results from these tests showed that use of contaminated soils yielded significantly lower removals than sand, with
removals from soil of chromium - 2% and zinc - 4 to 5%, and that willows were the best species for use at the site. Based
on these results, ANL-W calculated the number of years of phytoremediation that would be required to meet the
remediation goals for several site areas, and these estimates ranged from 6 to 122 years. As a next step, each of five sites
at ANL-W will be treated using phytoremediation during a two-year field test. Each site will be planted with three-foot
tall bare-root willow trees in a grid pattern, and whole tree harvesting (roots and above ground) will occur at the end of
each growing season. Excavated trees will be chipped and transported to an on-site incineration facility for disposal.
37
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Phytoremediation at the Open Burn and Open Detonating Area, Ensign-Bickford
Company, Simsbury, Connecticut
Site Name:
Ensign-Bickford Company, Open Burn and Open Detonating Area
Period of Operation:
April - October 1998
Purpose/Significance of Application:
Phytoremediation of lead in soil using both phytoextraction and
phytostabilization
Contaminants:
Lead
Average concentration of total lead was 635 mg/kg; concentrations were
higher than 1,000 mg/kg in many areas of the site, with some areas exceeding
4,000 mg/kg
Leachable lead concentrations were higher than 0.015 mg/L using the
Synthetic Precipitation Leaching Procedure (SPLP)
Contacts:
Vendor:
Dr. Michael Blaylock
Edenspace Systems Corp.
11720 Sunrise Valley Drive
Reston, Virginia 20191
Telephone: (703)390-1100
Fax: (703)390-1180
E-mail: SoilRx@aol.com
Location:
Simsbury, Connecticut
Cleanup Authority:
Not identified
Cleanup Type:
Full scale
Waste Source:
Open burn and open detonation
Technology:
Phytoremediation
Combination of phytoextraction (for treatment of four areas with high lead
concentrations - Areas 1-4) and phytostabilization (for treatment of one area
with low lead concentrations - Area 5) to reduce total soil lead concentrations
and SPLP extractable lead
Soils were fertilized with nitrogen, phosphorus, and potassium; dolomite lime
was added to adjust soil pH
Fertilizers and lime were tilled into the soil to a depth of 15 to 20 cm; an
overhead irrigation system was used to provide moisture
Areas 1-5 were seeded with Indian mustard and sunflower; 3 treatment crops
were planted
Supplemental foliar fertilizers were added through the irrigation system
Area 5 also treated with stabilizing amendments
Type/Quantity of Media Treated:
Soil
Soil type is silly loam with a pH of 6.5 to 7.5
Water table ranges in depth from 2 to 4 ft below surface soil
Site drainage is poor; soil remains saturated throughout the growing season
(April to October)
Regulatory Requirements/Cleanup Goals:
Reduce total lead concentrations; specific cleanup levels not identified
Results:
Plant growth for each of the treatment crops was generally good
Some areas within the treatment area remained saturated; these areas exhibited poor plant growth and reduced biomass
yields
Total lead concentrations in Areas 1-4 decreased from an average of 635 mg/kg (4/98) to 478 mg/kg (10/98); by 10/98,
the highest concentrations in Areas 1-4 had been reduced
Lead uptake ranged from 342 mg/kg (dry weight) in the Indian mustard in treatment crop 1 to 3252 mg/kg in the Indian
mustard in treatment crop 3
Average lead uptake measured in the sunflower plant material and Indian mustard were similar, having average lead
concentrations from all crops of approximately 1000 mg/kg (dry weight).
The average reduction in SPLP lead concentration in Area 5 was 0.95 mg/L.
Costs:
Not provided
38
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Phytoremediation at the Open Burn and Open Detonating Area, Ensign-Bickford
Company, Simsbury, Connecticut
Description:
The Ensign-Bickford Company in Simsbury, Connecticut, conducted open burn/open detonation (OB/OD) activities,
resulting in near surface soils in the area becoming contaminated with lead. From 1996 to 1997, Edenspace Systems
Corp. (formerly known as Phytotech, Inc.) conducted phytoremediation treatment of a 1.5 acre area surrounding the
OB/OD area. In 1998, this effort was expanded to include a total of 2.35 acres and to address not only reductions in total
lead concentrations, but also stabilizing leachable lead in the soil.
Phytoremediation was conducted using three treatment crops of Indian mustard and sunflower over a six month period.
Total lead concentrations in a portion of the site decreased from an average of 635 mg/kg (4/98) to 478 mg/kg, with hot
spots also reduced. In the area where phytostabilization also was used, the average reduction in SPLP lead concentration
was 0.95 mg/L. Further treatment is planned during 1999 and 2000.
39
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Phytoremediation at Twin Cities Army Ammunition Plant,
Minneapolis-St. Paul, Minnesota
Site Name:
Twin Cities Army Ammunition Plant (Site C and Site 129-3)
Location:
Minneapolis-St. Paul, Minnesota
Period of Operation:
Spring and Summer 1998
Cleanup Authority:
Not identified
Purpose/Significance of Application:
Phytoremediation of heavy metals in soil in a northern climate
Cleanup Type:
Field demonstration
Contaminants:
Heavy metals
Site C: antimony, arsenic, beryllium, lead, and thallium; average of 2,610
ppm lead in surface soil
Site 129-3: antimony, barium, chromium, and lead; average of 358 ppm lead
in surface soil
Waste Source:
Burn areas, pits used for wastewater
disposal
Contacts:
Technology Contact:
Ms. Darlene F. Bader
U.S. Army Environmental Center
SFIM-AEC-ETD (Bader
5179 Hoadley Road, Bldg E4430
Aberdeen Proving Ground, MD
21010-5401
Telephone: (410)436-6861
E-mail: t2hotline@aec.apgea.army.mil
Technology:
Phytoremediation
Demonstration used 0.2-acre plots at Site C and Site 129-3
Sites were prepared by clearing, fencing, plowing, and installing an irrigation
system
Two crops were grown on each site; first corn and second white mustard
Amendments (acetic acid and EDTA) were added to the soil to aid in the
solubilization and uptake of lead
Each crop was harvested and smelted
Type/Quantity of Media Treated:
Soil
Climate conditions included an average annual precipitation rate of 28.6
inches and an average annual temperature of 49.6ฐF; the location also can
have early/late frosts
Soil type at Site C is peat, underlain by fine sand and sandy clay; at Site 129-
3, fine- to medium-grained sand
Depth to water table at Site C is 2 to 6 ft bgs; at Site 129-3, 140 to 200 ft bgs
Regulatory Requirements/Cleanup Goals:
Determine if phytoextraction is a technically and economically feasible means of reducing lead contamination from
near-surface soils; specific cleanup levels not identified
Results:
Results from the first year's demonstration showed less than anticipated biomass yields and lead uptake in the
harvested plant material
Corn yielded 2.1 to 3.6 tons per acre, compared to the anticipated yield of 6.0 tons per acre; poor yields were attributed
to agronomically low producing soils at the site and the presence of other soil contaminants
Lead concentrations in harvested corn averaged 0.65% and 0.13% dry weight for Sites C and 129-3, compared with the
0.85% removal obtained during a prior greenhouse study
White mustard yielded 1.9 to 2.1 tons per acre; on a per plot basis, the total yields for Site C were half of this value
since the white mustard grew in only about 50% of the plot area
In the areas where plants grew, the yields were comparable to the expected yield of 2 tons per acre of mustard
Lead concentrations in harvested white mustard averaged 0.083% and 0.034% dry weight for Sites C and 129-3,
compared with the 1.5% obtained during greenhouse studies
40
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Phytoremediation at Twin Cities Army Ammunition Plant,
Minneapolis-St. Paul, Minnesota
Costs:
USAEC developed a preliminary cost estimate for a typical full-scale phytoextraction project in a northern U.S.
location, with two crops grown per year (one corn and one white mustard), sub-optimal soil conditions for plant
growth, soil lead levels of about 2,500 ppm, and five years of remediation required to meet the regulatory standard
The projected cost for full-scale phytoextraction was $30.34 per cubic yard of soil per year, or about $153 per cubic
yard of soil over the life of the project
Description:
The Twin Cities Army Ammunition Plant (TCAAP) is a 2,370-acre facility located in Arden Hills, Minnesota,
approximately 10 miles north of Minneapolis-St. Paul, Minnesota. The TCAAP was used for the production and storage
of small arms ammunition, related materials, fuzes, and artillery shell materials. A phytoremediation demonstration was
conducted at areas within Sites C and 129-3 at the TCAAP. Site C was used for burning production materials and
decontamination equipment. Site 129-3 contained pits that were believed to have contained contaminated wastewater
from a lead styphanate production facility. The project is a two-year field demonstration executed under a partnering
agreement among the U.S. Army Environmental Center (USAEC), Tennessee Valley Authority (TVA), TCAAP, and the
U.S. Army's Industrial Operations Command (IOC).
During the first year, phytoremediation was conducted at thee sites using corn and white mustard, and results were less
than anticipated. Changes planned for 1999 to improve performance included use of alternate mustard varieties; use of
higher fertilizer rates to encourage greater biomass; varying the irrigation scheme to encourage rooting and growth;
alternate amendment delivery systems; deep tilling; and alternate EDTA degradation methods.
41
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EG&G's Aerobic Biofiltration System for the Destruction of Hydrocarbon
Vapors from Fuel-Contaminated Soils
Site Name:
Patrick Air Force Base, Active Base Exchange (BX) Service Station
Location:
Florida
Period of Operation:
1/15/94 to 2/26/94
Cleanup Authority:
RCRAUST
Purpose/Significance of Application:
Treatment of extracted vapors from an S VE system
Cleanup Type:
Field demonstration
Contaminants:
Volatile hydrocarbons and BTEX
Initial soil gas contained TVH of 2,400 ppmv in study area
Waste Source:
Leaks from USTs
Contacts:
Vendor:
EG&G
Rotron Division
Saugerties, NY
Air Force Contact:
U.S. Air Force
Center for Environmental Excellence
Technology Transfer Division
Brooks AFB, TX
Technology:
Biocube (supplement to SVE)
Demonstration used an above-ground biofiltration unit, consisting of a
proprietary mixture of inorganic and organic substrate containing active
bacteria
Unit removed hydrocarbons by adsorption and biodegradation
Soil vapors from a horizontal vent well at 4 ft bgs passed through knockout
drum and diluted with fresh air to maintain an influent concentration of 1,000
ppm, then passed through a humidifier prior to the Biocube
A recirculation loop was installed to allow multiple passes through the
biofilter
Air emissions from the biofilter were passed through vapor-phase carbon
prior to discharge; three 5 5 -gal drums were used
Type/Quantity of Media Treated:
Soil vapors
Average depth to water table is 5 ft
Regulatory Requirements/Cleanup Goals:
Test objectives were to remove BTEX - >90% and TVH - >75%, based on an influent concentration of 1,000 ppmv
Results:
In first 8 days of operation, at a flow rate of 30 scfm, no measurable differences were detected between Biocube
influent and effluent, and the system was reconfigured
Maximum removal efficiencies of 90.8% for BTEX and 29.5% for TVH were achieved at very low loading rates and
flow rate of 3.2 scfm
At a 49 scfm flow rate, removal efficiencies were BTEX of 40% and TVH of 18%
Limitations experienced during the demonstration included a relatively slow system acclimation; vacuum leaks and
dilution of process gas; and inaccurate flow measurements
Costs:
Full-scale cost estimates were not provided based on this demonstration
Costs provided by other biofiltration vendors showed unit costs of $18.66/kgto $38.06/kg, for TVH influent
concentrations of 1,000 to 2,000 ppmv and flow rates of 20 - 40 scfm
42
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EG&G's Aerobic Biofiltration System for the Destruction of Hydrocarbon
Vapors from Fuel-Contaminated Soils
Description:
A field demonstration of the Biocube aerobic biofiltration system technology was conducted at Patrick Air Force Base
in Florida to determine the effectiveness of the technology in reducing VOCs in extracted soil vapors prior to release to
the atmosphere. The Biocube demonstration was tested on the soil vapors extracted from a single extraction well at the
Base Exchange service station.
The target removal efficiencies could be achieved only when the flow rate and loading were reduced to unpractically low
levels. As such, the Biocube could not be used as the primary vapor treatment technology when high BTEX and TVH
removal efficiencies were required.
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Internal Combustion Engines for the Destruction of Hydrocarbon Vapors from
Fuel-Contaminated Soils
Site Name:
Patrick Air Force Base, Active Base Exchange (BX) Service Station
Location:
Florida
Period of Operation:
10/18/93 to 1/14/94
Cleanup Authority:
Not identified
Purpose/Significance of Application:
Use of an internal combustion engine to treat extracted vapors from an SVE
system
Cleanup Type:
Field demonstration
Contaminants:
Volatile hydrocarbons
Initial soil gas contained TVH - 26,800 ppmv; benzene - ND; toluene -15
ppmv; ethylbenzene -14 ppmv; xylenes - 200 ppmv; concentrations
decreased after these initial levels were measured
Low levels of oxygen and BTEX were found in the soil vapors
Waste Source:
Leaks from USTs
Contacts:
Vendor:
Tom Davis
VR Systems
Anaheim, CA
Telephone: (714) 826-0483
Fax: (714) 826-8746
Air Force Contact:
U.S. Air Force
Center for Environmental Excellence
Technology Transfer Division
Brooks AFB, TX
Technology:
Internal combustion engine (ICE, as a supplement to SVE)
Demonstration used a VR Systems Model V3 Ford Motor Company 460 in3
displacement engine, 55-gallon knockout drum prior to engine, and onboard
computer
Horizontal vent well installed at 4 ft bgs as part of a bioventing pilot test, and
used in vapor extraction mode for demonstration
During ICE demonstration, flow rate of 150 scfm and average engine speed
of 1,790 rpm used for first 2 days, followed by a flow rate of 80 scfm
Propane used as supplemental fuel; 1,925 ft3 used in first 2 days
Type/Quantity of Media Treated:
Soil vapors
Average depth to water table is 5 ft
Regulatory Requirements/Cleanup Goals:
The objectives of the demonstration included evaluating the performance and cost of the ICE technology
Results:
Destruction efficiency was >99% for BTEX and >96% for TVH throughout the test period
A 4% reduction in TVH destruction efficiency occurred when the engine rings and valves began to wear, allowing a
portion of the propane to pass unburned through the exhaust
Costs:
Average operating cost was $325/day for first 5 days of operation, including equipment rental, propane, and labor
Over the course of the test, operating costs ranged from $0.83 to 15.40/kg TVH destroyed, and $97 to 550/kg of BTEX
destroyed
Costs varied based on soil vapor concentrations and supplemental fuel requirements
44
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Internal Combustion Engines for the Destruction of Hydrocarbon Vapors from
Fuel-Contaminated Soils
Description:
A field demonstration of an internal combustion engine (ICE) technology for extracted soil vapors was conducted at
Patrick Air Force Base in Florida. In Florida, soil vapor extraction must include a vapor treatment technology capable of
removing 99% of the VOCs prior to discharge. The ICE demonstration was tested on the soil vapors extracted from a
single extraction well at the Base Exchange service station.
The ICE tested was a Ford Motor Company 460 in3 displacement engine; it was preceded by a 55-gallon knockout drum.
An onboard computer was used to control system operation. For the demonstration, the initial flow rate was 150 scfm
with an average engine speed of 1,790 rpm, followed by a flow rate of 80 scfm for the remainder of the demonstration.
Propane was used as supplemental fuel. The destruction efficiency measured was >99% for BTEX and >96% for TVH
throughout the test period. The researchers found that initial soil gas oxygen levels were low, and they had to adjust flow
rates to maintain an adequate oxygen/fuel ratio. According to the researchers, ICE technology is most effective when
initial soil gas TVH is greater than 40,000 ppm, when the unit can operate without supplemental fuel.
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Purus PADREฎ Regenerative Resin System for the Treatment of Hydrocarbon
Vapors from Fuel-Contaminated Soils
Site Name:
Vandenberg Air Force Base, Base Exchange (BX) Service Station
Location:
Lompoc, CA
Period of Operation:
2/11/94 to 6/1/94
Cleanup Authority:
Santa Barbara County Air Pollution
Control District
California Department of Toxic
Substances
Central Coast Regional Water Quality
Control Board
Purpose/Significance of Application:
Use of resin adsorption to treat extracted vapors from an SVE system
Cleanup Type:
Field demonstration
Contaminants:
Petroleum hydrocarbons and BTEX
Maximum concentrations in soil: TPH-gasoline - 22,000 mg/kg; benzene -
210 mg/kg; toluene - 2,000 mg/kg; ethylbenzene - 490 mg/kg; xylenes - 2,900
mg/kg
Maximum concentrations in soil gas: volatile hydrocarbons - 54,000 ppmv;
benzene - 400 ppmv
Waste Source:
Leaks from USTs
Contacts:
Vendor:
Purus Inc.
2713 N. First Street
San Jose, CA 95134-2000
Air Force Contact:
U.S. Air Force
Center for Environmental Excellence
Technology Transfer Division
Brooks AFB, TX
Technology:
Resin Adsorption (as a supplement to SVE)
Demonstration used a Purus Padreฎ Model 1.6 vapor treatment system to treat
hydrocarbon vapors removed using soil vapor extraction (5 SVE wells; flow
rates 20 - 49 scfm)
System used filter beds filled with synthetic polymeric adsorbent (PurSorb -
200); preceded by a water and dirt trap; two beds were used with 180 Ibs
adsorbent/bed; beds were switched between adsorption and desorption cycles
In the desorption cycle, organic material was volatilized, condensed, and
transferred to a tank; 2-stage condenser operated at 2ฐC and ^45ฐC
Treated soil gas with less than 1,000 ppm total hydrocarbons was returned to
the soil using a perimeter injection trench for in situ biotreatment
Type/Quantity of Media Treated:
Soil vapors
Contamination found within a permeable silly sand, extending from 3 to 14 ft
bgs
Depth to groundwater varies from 7 to 9 ft bgs and fluctuates seasonally
Impermeable clay bed located between 14 and 20 ft bgs
Soil vapor depleted of oxygen due to fuel biodegradation
Regulatory Requirements/Cleanup Goals:
Objectives of the demonstration included evaluating the performance and cost of the Purus Padre* technology
No air emission permit was required; instead operating conditions were established for ambient air, flux emissions, and
site emissions
Results:
Average soil vapor concentrations reduced by factor of five during first 18 days of treatment and by factor of 20 during
110 days of operation, with increase in oxygen content
Resin system removal rates averaged > 98% for total hydrocarbons and >99% for benzene
The system recovered approximately 570 gallons of hydrocarbons (1,600 kgs; 3,520 Ibs) and 70 gallons of water during
the 110 day demonstration
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Purus PADREฎ Regenerative Resin System for the Treatment of Hydrocarbon
Vapors from Fuel-Contaminated Soils
Costs:
Demonstration costs were $36,634, consisting of setup - $2,500; rental - $25,667; operation labor - $4,500; power -
$1,212; nitrogen - $1,760; and mobilization/demobilization - $1,000
Total treatment cost corresponded to a unit cost of $23/kg ($ 10.45/lb) of hydrocarbons removed
A comparison of technologies showed that internal combustion engine technology will be less expensive that Purus
Padreฎ at fuel spill sites
Description:
In 1985, two 10,000 gallon unleaded gasoline tanks and associated piping were removed from the Vandenburg AFB BX
service station. Two additional gasoline storage tanks and a 250-gallon waste oil tank were removed in 1991.
Hydrocarbon contamination was discovered in soil and groundwater beneath the tanks. A two-phased bioventing pilot
test began on February 11, 1994. During phase one, high levels of hydrocarbon vapors were removed using soil vapor
extraction, treated using a Purus Padreฎ resin adsorption unit, and returned to the soil using a perimeter injection trench
for in situ biotreatment. When the average soil gas concentrations had been reduced to less than 1,000 ppmv, the Purus
Padreฎ unit was removed and soil gas returned directly through the trench.
This demonstration used a Purus Padreฎ Model 1.6 vapor treatment system to treat hydrocarbon vapors removed using
five soil vapor extraction wells, with a total flow rate of 20 - 49 scfm. The system used filter beds filled with PurSorb -
200; 180 Ibs adsorbentfoed were used. System removal rates averaged > 98% for total hydrocarbons and >99% for
benzene, and recovered approximately 570 gallons of hydrocarbons (1,600 kgs). Demonstration costs were $36,634,
corresponding to a unit cost of $23/kg of hydrocarbon removed. This system was found to be an effective method of
controlling vapor emissions.
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Barometrically Enhanced Remediation Technology (BERT) Demonstration at
Idaho National Engineering and Environmental Laboratory, RWMC, Pit 2, Idaho
Falls, Idaho
Site Name:
Idaho National Engineering and Environmental Laboratory, Radioactive Waste
Management Complex, Pit 2
Location:
Idaho Falls, Idaho
Period of Operation:
December 1996 to January 1999
Cleanup Authority:
Not identified
Purpose/Significance of Application:
Demonstrated use of passive soil venting for remediation of VOC-
contamination
Cleanup Type:
Field demonstration
Contaminants:
Chlorinated solvents
Maximum concentration of carbon tetrachloride was 111 ppm
Waste Source:
Waste burial pit
Contacts:
Technical Contacts:
William E. Lowry
Science and Engineering Associates, Inc.
(505) 424-6955
E-mail: blowry@seabase.com
Eric Miller
Lockheed Martin Idaho Technologies
Company
(208) 526-9410
E-mail: ecm@inel.gov
Management Contacts:
William Haslebacher
Federal Energy Technology Center
(304) 285-5435
E-mail: whasle@fetc.doe.gov
Technology:
Barometrically Enhanced Remediation Technology (BERT)
BERT consists of a large surface area seal, a collection plenum, and a
one-way valve to vent soil gas to the atmosphere at a low rate; the system
operation relies on small changes in atmospheric pressure and wind
effects to displace soil gas
The system at INEEL used a surface seal 100 ft by 100 ft made of 45-mil
EPDM, a collection plenum filled with YA to l/i inch pea gravel that was
10 ft thick and 30 ft diameter, and a vent pipe 6 ft tall
In October 1996 (after almost 2 years of operation), the system was
modified to extend the collection plenum to the edges of the surface seal
to expose more soil; this was referred to as the wind-enhanced
configuration
No boreholes or site electrical power was used in the demonstration
Type/Quantity of Media Treated:
Soil (in situ)
Surface soils are typically less than 20 ft thick and consist of gravelly
sand and fine-grained eolian deposits; water table is 600 ft bgs
Regulatory Requirements/Cleanup Goals:
Objectives of demonstration were to obtain technical and cost information about BERT
No specific cleanup goals were identified
Results:
During the initial phase of the demonstration, the average vent flow rate was 9 mVday, with contaminants removed as
follows: TCE - 27.8 ppm and 1.15 g/day, CC14 - 5.2 ppm and 0.25 g/day, and chloroform -19.6 ppm and 0.73 g/day
During the wind-enhanced phase of the demonstration, the average vent flow rate was 34 nrVday, with contaminants
removed as follows: TCE -18.9 ppm and 2.9 g/day, CC14 - 6.8 ppm and 1.2 g/day, and chloroform - 9.4 ppm and 1.3
g/day
Results showed that wind speed had a greater effect on vent flow than did changes (drop) in atmospheric pressure
48
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Barometrically Enhanced Remediation Technology (BERT) Demonstration at
Idaho National Engineering and Environmental Laboratory, RWMC, Pit 2, Idaho
Falls, Idaho
Costs:
Projected costs for a full-scale application of BERT were $67,860 total, including materials, labor, and O&M, or
$100/yd3 ($74/ton)
Unit costs for BERT were compared with costs for landfill disposal ($320/yd3, $237/ton), soil vapor extraction
($183/yd3, $136/ton), and thermal desorption ($360/yd3, $267/ton), and found to be lower on both a per cubic yard and
per ton basis
Description:
The Idaho National Engineering and Environmental Laboratory (INEEL) Radioactive Waste Management Complex
(RWMC) contains a Subsurface Disposal Area (SDA). The SDA is a 96 acre fenced disposal area where mixed wastes
containing VOCs and radioactive wastes were buried in shallow waste disposal pits, trenches, and soil vault rows.
Disposal pit 2 at the SDA received barrels of sludge between 1954 and 1965. The primary contaminant in this area was
chlorinated solvents.
The Barometrically Enhanced Remediation Technology (BERT) was demonstrated at this site. BERT induces net
upward displacement of soil gas based on small changes in atmospheric pressure and wind speed. A system was
demonstrated that was 100 ft long by 100 ft wide, and that required no boreholes or site power. During the initial phase of
the demonstration, the average vent flow rate was 9 nf/day, with removals of TCE, CC14, and chloroform ranging from
0.25 to 1.15 g/day. During the wind-enhanced phase of the demonstration, the average vent flow rate was 34 nrVday, with
removals of TCE, CC14, and chloroform ranging from 1.2 to 2.9 g/day. Results showed that wind speed had a greater
effect on vent flow than changes/drops in atmospheric pressure. Unit costs for BERT were compared with costs for
landfill disposal, soil vapor extraction, and thermal desorption, and found to be lower on both a per cubic yard and per ton
basis. A BERT system is currently under construction at Los Alamos National Laboratory, with operation anticipated
by the end of July 1999.
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INCINERATION ABSTRACTS
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On-Site Incineration at Weldon Spring Ordnance Works, St. Charles County,
Missouri
Site Name:
Former Weldon Spring Ordnance Works (WSOW), Operable Unit 1
Location:
St. Charles County, Missouri
Period of Operation:
Trial Burn - 8/14/98 to 8/16/98
Interim Operation - 8/17/98 to 9/18/98
Full-Scale Operation - 9/19/98 through 1999
Cleanup Authority:
CERCLA and State
Record of Decision (ROD) date - May
1996
Purpose/Significance of Application:
Full-scale, on-site incineration of explosives and propellants
Cleanup Type:
Full scale
Contaminants:
Explosives/Propellants
2,4,6-Trinitrotoluene (TNT) and 2,4- and 2,6-Dinitrotoluene (DNT)
Maximum concentrations:
- 510,632 mg/kg TNT
- 7,100mg/kg2,4-DNT
- 200 mg/kg 2,6-DNT
Some soil contaminated by lead, asbestos, PCBs, and PAHs
Waste Source:
Discharge and leaks/spills of
contaminated wash water and
wastewater; open burning of
explosives
Contacts:
Project Management:
Mr. Dan Mroz
USACE, Kansas City District
USACE-MD-H
60 IE. 12th Street
Kansas City, KS 64106
(816) 983-3567
Captain Jim Workman
USACE
Big Piney Building 1018
P.O. Box 200
Ft. Leonard Wood, MO 65473
(314)498-5176
Vendor:
Mr. Alan J. Zupko
Roy F. Weston, Inc.
1 Weston Way
West Chester, PA 19380-1499
(610) 701-3623
Regulatory Contacts:
Mr. Tom Lorenz
U.S. EPA Region 7
726 Minnesota Avenue
Kansas City, KS 66101
(913)551-7292
Mr. Ray Strebler
Missouri Department of Natural Resources,
Hazardous Waste Program,
Division of Environmental Quality
P.O. Box 176
Jefferson City, MO 65102-0176
(573)751-7241
Technology:
On-Site Incineration
Excavated pipeline and combustible debris were shredded
Soil and shredded materials were fed through a screen to remove large
debris
The incineration system consisted of a co-current, rotary kiln and a
secondary combustion chamber (SCC)
The kiln operated at an exit gas temperature above 1626 ฐF and the SCC
operated above 1823ฐF
Hot gases exiting the SCC passed through a two-stage spray tower and
two pulse-jet baghouses in parallel
Treated soil and fly ash were stockpiled for compliance sampling
Treated soil and fly ash that met treatment standards were used as fill
material at the site
Type/Quantity of Media Treated:
An estimated 30,000 tons (18,000 cubic yards) of nitroaromatics-
contaminated soil
An estimated 85,230 linear feet of nitroaromatics-contaminated wooden
pipeline
Average Moisture Content: 18%
BTU Value: 60 Btu/lb
Pipeline: 1 linear foot weighed approximately 25 pounds; the shredded
density was 0.43 tons/CY
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On-Site Incineration at Weldon Spring Ordnance Works, St. Charles County,
Missouri
Regulatory Requirements/Cleanup Goals:
Destruction and Removal Efficiency (ORE) of 99.99% for POHC
Regulatory limits for treated soil and fly ash after incineration were 57 ppm TNT and 2.5 ppm 2,4- and 2,6-DNT
Treated soil and fly ash with TCLP values in excess of 5 mg/L lead were stabilized
Air emission requirements included control of metals, hydrogen chloride, chlorine, 2,3,7,8-tetrachlorinated dibenzo-p-
dioxin toxic equivalents, carbon monoxide, total hydrocarbons, nitrous oxides, paniculate matter and opacity in the
stack gas
Results:
Sampling of treated soil and fly ash indicated that the soil and pipeline cleanup goals were met
Emissions data from the trial burn, interim operations and full-scale operations indicated that all emissions standards
were met
Costs:
The total cost for this project was $13,665,997 including all remedial activities performed at the site, including
incineration
Description:
The former Weldon Spring Ordnance Works included a nitroaromatics manufacturing facility operated by the Army
between 1941 and 1945. Wash water and wastewater generated in the TNT and DNT production plants were discharged to
settling lagoons at the WSOW prior to mid-1942 and to wastewater treatment plants via an underground wooden pipeline
after mid-1942. Leaks and spills occurred at the production buildings and the wastewater pipeline. Open burning was used
to dispose and/or treat off-specification material, surplus product and contaminated soil. Nitroaromatics were detected in
surface soil, shallow subsurface soil, groundwater and springs at the former WSOW. A ROD was signed in September
1996, specifying on-site incineration as the remedial technology for addressing nitroaromatics-contaminated soil and
wooden pipeline at the site. Contaminated soil and pipeline at the former WSOW was identified as Operable Unit (OU) 1.
Site cleanup goals were specified in the ROD.
Site work for construction of the incinerator was commenced in December 1997. Incinerator start up and shake down were
performed in July and August 1997. The trial burn was conducted in August 1998. After receiving approval from EPA
and MDNR of the proposed operating limits, the incinerator was put into full-scale operation in September 1998.
Treatment was completed in April 1999. The incineration system consisted of a co-current, rotary kiln followed by a SCC.
After confirming that treated soil and fly ash met the cleanup criteria, the materials were backfilled at the site.
Demobilization of the incinerator from the site was completed in 1999.
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THERMAL DESORPTION ABSTRACTS
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Thermal Desorption at the Arlington Blending and Packaging Superfund Site
Arlington, Tennessee
Site Name:
Arlington Blending and Packaging Superfund Site
Location:
Arlington, TN
Period of Operation:
January 13 to June 4, 1996
Cleanup Authority:
CERCLA - Remedial Action
ROD signed June 28, 1991
Purpose/Significance of Application:
Application of low temperature thermal desorption to treat pesticide-
contaminated soil
Cleanup Type:
Full scale
Contaminants:
Pesticides and Metals
Maximum concentrations during remedial investigation: chlordane (390
mg/kg surface and 120 mg/kg subsurface); endrin (70 mg/kg surface and 20
mg/kg subsurface); pentachlorophenol (130 mg/kg surface and 9.5 mg/kg)
subsurface; arsenic (370 mg/kg surface)
Waste Source:
Leaks and spills of pesticides during
blending and packaging operations;
process wastewater discharged to
drainage ditches at the site
Contacts:
Vendor:
Smith Environmental Technologies
Corporation (formerly Canonie)
EPA Remedial Project Manager:
Derek Matory
U.S. EPA Region 4
345 Courtland Street, NE
Atlanta, GA 30365
Telephone: (404) 562-8800
Fax: (404) 562-8788
E-mail: matory.derek@epa.gov
Additional Contacts:
George Harvell
Memphis Environmental Center
2603 Corporate Avenue, Suite 100
Memphis, TN 38132
Telephone: (901) 345-1788
Fax: (901) 398-4719
Paul Sadler
Senior Project Engineer
Focus Environmental, Inc.
9050 Executive Park Drive
Knoxville, TN 37923
Telephone: (423) 694-7517
E-mail: psadler@focusenv.com
Technology:
Low Temperature Thermal Desorption
Direct-fired rotating dryer that heated the soil to between 580 and 750ฐF
using a hot air stream
Propane gas was used to heat the air stream, and the organic constituents in
the soil were desorbed in the dryer through contact with the heated air
Off-gas treatment included a cyclone/baghouse system; a low pressure drop
Venturi air scrubber; and vapor-phase carbon adsorption
A vacuum of 0.10 to 0.18 inches of water was maintained throughout the
process train
Type/Quantity of Media Treated:
Soil-41,431 tons
Soils primarily silty sands with an average moisture content of 17 wt%
pH of soil-6.8
Regulatory Requirements/Cleanup Goals:
Cleanup goals for organics were: chlordane (3.3 mg/kg); heptachlor (0.3 mg/kg); pentachlorophenol (0.635 mg/kg);
endrin (0.608 mg/kg); heptachlor expoxide (0.2 mg/kg)
Cleanup goal for arsenic initially established at 25 mg/kg in ROD; changed to 100 mg/kg in BSD. All treated soil with a
total arsenic concentration >100 mg/kg was to be disposed of off-site. Any treated soil with total arsenic concentrations
>100 mg/kg and leachable arsenic >5mg/L (determined by the toxicity characteristic leaching procedure) was required
to be identified as hazardous waste and stabilized prior to disposal off-site
Emission standards for the unit were total hydrocarbons (500 ppmv); particulates (0.08 gr/dscf); and system removal
efficiency (>95%)
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Thermal Desorption at the Arlington Blending and Packaging Superfund Site
Arlington, Tennessee
Results:
A total of 84 batches of soil (41,431 tons) were treated
All but six batches of soil met the cleanup goals for the organics on the first pass through the system
Three batches exceeded the cleanup levels and were retreated and met the cleanup goals
An additional three batches were slightly above the cleanup levels for total chlordane; based on the concentrations, EPA
determined that the batches were not required to be retreated
One batch of treated soil did not meet the 100 mg/kg limit for arsenic and was shipped offsite for disposal in a Subtitle
C landfill; however, because the TCLP level for arsenic was below the 5 mg/L limit, solidification/stabilization prior to
off-site disposal was not required
Compliance with the emissions standards was verified during the performance test; the unit met all emissions standards
during the three test runs, achieving a system removal efficiency >99.999%
Costs:
Total project cost was $5,586,376 including $4,356,244 in costs directly associated with the thermal treatment
Treatment costs included $4,293,893 in capital costs and $62,351 in O&M costs
The calculated unit cost for this application was $105 per ton, based on 41,431 tons of soil treated
Description:
The Arlington Blending and Packaging Superfund site, located in Arlington, Tennessee, is a 2.3 acre site that was used for
the formulation and packaging of pesticides and herbicides from 1971 to 1978. Chemicals handled at the facility included
the pesticides endrin, aldrin, dieldrin, chlordane, heptachlor, lindane, methyl parathion, and thimet as well as solvents and
emulsifiers used in the formulation operations. Leaks and spills of chemicals occurred during these operations and process
wastewater was discharged to drainage ditches at the site. The site was placed on the National Priorities List (NPL) in July
1987. A remedial investigation (RI), begun in 1988, determined that the main areas of soil contamination at the site were
located around and beneath the process buildings. The ROD, signed in 1991, specified excavation of contaminated soil and
treatment on site using thermal desorption.
Smith's low temperature thermal aeration (LTTA) process was used to treat the contaminated soil at the site. The unit
included a direct-fired rotating dryer that heated the soil using a hot air stream. The heated soil was discharged from the
rotary dryer to an enclosed pugmill where it was quenched with water to cool and rehumidify the soil. The treated soil was
then sampled, and based on the results, backfilled on site or stabilized and shipped off-site for disposal. A total of 41,431
tons of contaminated soil in 84 batches were treated during this application. All but six batches of soil met the cleanup
goals for the organics on the first pass through the system. Three batches exceeded the cleanup levels and were retreated.
Three additional batches slightly exceeded the cleanup goal for total chlordane. EPA determined, based on the
concentrations, that the batches did not have to be retreated. Following confirmation that the cleanup goals had been met,
treated soil was backfilled at the site. Only one batch of treated soil did not meet the total arsenic limit and was shipped
offsite for disposal in a Subtitle C landfill. The original estimate for the soil excavation was 10,000 tons, based on the
results from field-based screening using the Drexil method. Subsequent verification analyses indicated that the results
from this method were not accurate. The site was recharacterized, using immunoassay sampling (results confirmed to be
accurate by an off-site laboratory), and an additional 30,000 tons of soil requiring excavation were identified. The use of
immunoassay sampling saved time by providing real time results (versus 5 to 6 day turnaround time for an off-site
laboratory).
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Thermal Desorption at Letterkenny Army Depot Superfund Site, K Areas, OU 1
Chambersburg, Franklin County, Pennsylvania
Site Name:
Letterkenny Army Depot Superfund Site K Areas, OU 1
Location:
Chambersburg, Franklin County, Pennsylvania
Period of Operation:
September 1993 to October 1994
Cleanup Authority:
CERCLA
ROD signed June 28, 1991
ROD modified August 2, 1991
Purpose/Significance of Application:
Thermal desorption to treat VOC-contaminated soil, including soils with
high oil and grease content
Cleanup Type:
Full scale
Contaminants:
Volatile Organic Compounds and Metals
Maximum concentrations of TCE of 30,000 mg/kg in soils in K areas
Maximum concentrations of lead of 10,000 mg/kg in soils in K areas
Waste Source:
Disposal of waste in lagoons; leaks and spills
from waste solvent drum storage area
Contacts:
Vendor:
McLaren/Hart, Inc
300 Stevens Drive
Philadelphia, PA 19113
EPA Contact:
Stacie Driscoll
U.S. EPA Region 3
1650 Arch Street
Philadelphia, PA 19103
Telephone: (215) 814-3368
Facsimile: (215) 814-3001
E-mail: driscoll.stacie@epamail.epa.gov
USACE Contact:
Paul Stone
U.S. Army Corps of Engineers (USACE)
Baltimore District
PO Box 1715
Baltimore, MD 21203-1715
Telephone: (410) 962-4906
Facsimile: (410) 962-6732
E-mail: Paul.R.Stone@nab02.usace.army.mil
Technology:
Low Temperature Thermal Desportion
Patented I.R.V.-100 LTTD system
1.2 million BTU/hr system; six carbon steel treatment chambers (5
cubic yards of soil per chamber capacity)
Each chamber equipped with 16 propane-fired infrared heaters; soil
temperature of 600ฐ F
System operated at under a vacuum of 12 to 20 column inches of
water; volumetric air flow of 500 to 1,000 cubic feet per minute per
chamber
Residence Time- 60 minutes for clay soils and 120 to 150 minutes for
black stained soils
Off-gas treatment included two cyclones, two air expansion chambers
to cool the temperature of the air from about 120ฐ F to about 90 ฐF,
and one 4,000 pound activated carbon adsorption unit
Type/Quantity of Media Treated:
Soil -13,986 cubic yards (11,366 cubic yards of clay soil; 2,620 cubic
yards of black stained soil)
Regulatory Requirements/Cleanup Goals:
ROD specified cleanup goal for TCE in treated soil - 0.05 mg/kg
RCRA Land Disposal Restriction treatment standards for the following VOCs - acetone, benzene, carbon tetrachloride,
chlorobenzene, o-dichlorobenzene, 1,1,1-trichloroethane, 1,1,2-trichloroethane, tetrachloroethene, ethylbenzene,
toluene, and total xylene) and for metals
No goals were established for total RCRA metals
Emissions standards for the unit included an opacity limit of < 10% for 30 minutes, total VOC emissions of < 1
pound/hour, and paniculate matter of < 0.08 grains per dry standard cubic foot
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Thermal Desorption at Letterkenny Army Depot Superfund Site, K Areas, OU 1
Chambersburg, Franklin County, Pennsylvania
Results:
A total of 13,986 cubic yards of contaminated soil were treated to the cleanup goals; information on the total number of
batches treated was not provided
Soil that did not meet the cleanup goals on the first pass were retreated until the goals were met; approximately 10% of
the clay soils and 14% of the black stained soils from the K-l area required retreatment
Treated soil that exceeded the TCLP limits for metals required to be stabilized and shipped off site for disposal;
treated soils that was excavated from the top 6 feet of the K-l area and the top 3 feet of the K-2 area were stabilized
prior to off-site disposal; a total of about 4,000 cubic yards of treated soils was stabilized prior to disposal off site
The remaining treated soil was backfilled on-site
Costs:
Total actual project cost - $5,402,801, including $4,647,632 in actual costs for McLaren/Hart's application of thermal
treatment and other project costs identified by USAGE for design and project remediation ($192,827), design contract
costs ($249,320), and construction contract management ($312,320)
The unit cost for the application was $220 per cubic yard, based on 13,986 cubic yards of soil treated
McLaren/Hart's actual costs of $4,647,632 include $2,622,470 for five modifications to the contract
USAGE subsequently paid McLaren/Hart a total of $3,905,256 for the remediation of the K area soils, as a result of a
settlement agreement regarding costs of the modifications
Description:
The Letterkenny Army Depot is a 19,243-acre U.S. Army facility located in Chambersburg, Franklin County,
Pennsylvania. Since 1942, the Army has used the site to overhaul, rebuild, and test missile systems; store and demilitarize
ammunition; and maintain and refurbish equipment and vehicles. Operations at the facility have included degreasing,
metal plating, painting and paint stripping, steam cleaning, and petroleum storage. Wastes from these operations were
disposed of in landfills, trenches, pits, and surface impoundments at the site. Site investigations identified elevated levels
of volatile organic compounds in soil and groundwater in the site, including three areas of soil contamination, also referred
to as the K areas. K-l was a waste disposal lagoon, K-2 was used as a transfer station, and K-3 was an area used to store
drums of waste solvent. A 1992 remedial investigation identified elevated levels of TCE, polychlorinated biphenyls
(PCBs), metals, and semivolatile organic compounds (SVOCs) in soils in the K areas. A Record of Decision, signed in
June 1991, specified excavation of VOC-contaminated soil and on-site treatment using low temperature thermal
desorption.
A low temperature thermal desorption system (LTTD), model I.R. V.-100 designed by McLaren/Hart, was used to treat the
contaminated soil from the K areas. The 1.2 million BTU/hr system, operated under vacuum, included a total of six
carbon steel treatment chambers used to heat soils to temperatures up to 600ฐF. The unit operated from September 1993
to October 1994. A total of 13,986 cubic yards of soil were treated during this application, including 2,620 cubic yards of
"black stained" soils that were encountered during the excavation of areas K-l and K-3. The black stained soils contained
heavy oils, greases, and debris and were stockpiled separately from the "clay soils" for treatment. Approximately 10% of
the clay soils and 14% of the black stained soils from the K-l area were retreated. In addition, a total of about 4,000 cubic
yards of treated soils was stabilized prior to disposal. This included treated soil that was above the TCLP metals levels and
from the top 6 feet of K-l area and top 3 feet of K-2 area. The remaining treated soil was backfilled on-site. According to
vendor, the presence of the black stained soils had not been anticipated at the time of the original contract. The adverse
effects of these soils on the operation of the unit, from the heavy hydrocarbons in the soil, were discovered during the first
demonstration test and required modification to the design and operation of the system, including expansion of the
emissions controls. This resulted in increased costs and a delay in the schedule over the original plan.
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Low Temperature Thermal Desorption at Longhorn Army Ammunition Plant,
Karnack, Texas
Site Name:
Longhorn Army Ammunition Plant, Burning Ground No. 3
Location:
Karnack, Texas
Period of Operation:
Proof of Performance Test-February 1997
Full-Scale Operation - February to December 1997
Cleanup Authority:
CERCLA and State
ROD date - May 1995
Purpose/Significance of Application:
Thermal desorption to treat chlorinated solvents in the site soil and source
materials
Cleanup Type:
Full scale
Contaminants:
Organic Compounds - Volatiles (Halogenated)
Trichlororethylene (TCE) and Methylene Chloride
Maximum concentrations in mg/kg - TCE (1,000 mg/kg) and Methylene
Chloride (742 mg/kg)
Waste Source:
Open burning, incineration,
evaporation, and burial of pyrotechnic
and combustible solvent wastes
Contacts:
Project Management:
Jonna Polk
USACE, Tulsa District
1645 South 101st Avenue
Tulsa, OK 74128-4629
Oscar Linebaugh
USACE, Ft. Worth District
Eastern Area Office
(318)676-3365x225
David Tolbert
Longhorn/Louisiana Army
Ammunition Plant
Highway 80 East, Gate 4
Doyline, LA71055
(903) 679-2054
Vendor:
Bryan Smith
Radian International LLC
Longhorn Army Ammunition Plant
P.O. Box 107
Karnack, TX 75661
(903) 679-3448
Regulatory Contact:
Chris Villarreal
U.S. EPA Region 6
1445 Ross Avenue, Suite 1200
Dallas, TX 75202-2733
(214) 665-6758
Diane Poteet
TNRCC
Superfund Investigation,
MC-143
12100 Park 35 Circle, Bldg. D
Austin, TX 78753
Technology:
On-Site Low Temperature Thermal Desorption (LTTD)
Soil was fed through a vibrating screen to remove large debris
Soil passed counter-current to hot combustion gases in one of two parallel
LTTD units
Soil was heated between 350 and 650ฐF
The gas stream from each LTTD unit passed through a baghouse and then the
two streams were combined
The combined gas stream was preheated to 680ฐF prior to entering the
catalytic oxidizer where desorbed VOCs in the gas stream were destroyed
Hot gases exiting the oxidizer passed through a heat exchanger, multi-stage
quench and packed bed scrubber
Solids exiting the thermal desorption units and baghouses were stockpiled for
compliance sampling
Type/Quantity of Media Treated:
Soil (ex situ)
32,293 cubic yards (51,669 tons) of soil
Average Clay Content: 31.5%
Mean Particle Size: 0.032mm
Average Moisture Content: 17.5 %
Bulk Soil Density: 1.6 tons per cubic yard
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Low Temperature Thermal Desorption at Longhorn Army Ammunition Plant,
Karnack, Texas
Regulatory Requirements/Cleanup Goals:
If TCE or methylene chloride concentrations in the soil were below 40 mg/kg, the treatment objective was to reduce the
concentrations to 2 mg/kg or lower
If TCE or methylene chloride concentrations in the soil exceeded 40 mg/kg, the treatment objective was to reduce the
concentrations by at least 95%
Air emission requirements included control of total chemical emissions, paniculate matter and 2,3,7,8-tetrachlorinated
dibenzo-p-dioxin toxic equivalents in the stack gas
Results:
Sampling of treated soil indicated that all soil cleanup goals were met
Emissions data from the Proof of Performance test and full-scale operations indicated that all emissions standards were
met
Costs:
The total cost for this project was $4,886,978
The total cost for treatment was $ 151 per cubic yard ($95 per ton) of contaminated material
Description:
Burning Ground No. 3 was operational from 1955 to 1997. The site was used for the treatment, storage, and disposal of
pyrotechnic and combustible solvent wastes including open burning, incineration, evaporation and burial. Site
investigations indicated the presence of high concentrations of chlorinated solvents and heavy metals in subsurface soils
and shallow groundwater at the site. In addition, buried sawdust and other solvent-contaminated wastes were encountered.
A ROD was signed in May 1995, specifying LTTD as the remedial technology for addressing soil contamination at the
site. Site soil cleanup goals were specified in the ROD.
Mobilization and set-up of the soil treatment plant (STP) occurred in January 1997. System start-up and shake down and
the Proof of Performance test were conducted in February 1997. After successfully demonstrating that the STP could meet
performance requirements, the STP was put into full production. Soil/source material excavation and full-scale operation
of treatment system was performed between February and December 1997. The STP consisted of a counter-current, LTTD
system followed by a low-temperature, catalytic oxidation system to treat the LTTD off-gas. After confirming that treated
soil met the cleanup criteria, the soil was used as general fill material for landfill caps at two sites at the LHAAP.
Demobilization of the STP from the site was completed in January 1998 and site restoration was completed by June 1998.
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Thermal Desorption at the Rocky Flats Environmental Technology Site,
Trenches T-3 and T-4, Golden, Colorado
Site Name:
Rocky Flats Environmental Technology Site, Trenches T-3 and T-4
Location:
Golden, Colorado
Period of Operation:
June - August 1996
Cleanup Authority:
CERCLA - Removal
Action Memorandum
Date - January 18, 1996
Purpose/Significance of Application:
Application of thermal desorption to treat soils contaminated with VOCs and low levels of
radiation
Cleanup Type:
Full scale
Contaminants:
Chlorinated solvents, ketones, and low level radionuclides
The highest concentrations of VOCs in trench T-3 were TCA at 13,000 mg/kg, acetone at
5,100 mg/kg, methylene chloride at 2,400 mg/kg, and carbon tetrachloride at 700 mg/kg
The highest concentrations of VOCs in trench T-4 were TCE at 680 mg/kg and acetone at
120 mg/kg
Subsurface soils contaminated with low levels of radionuclides including uranium,
plutonium, and tritium
Waste Source:
Burial of drums and debris
in trenches on the site
Contacts:
Vendor:
Ronnie Hill
Principal Construction Manager
McLaren-Hart, Inc.
9323 Stockport Place
Charlotte, NC 28273
(704) 587-0003
ronnie_hill@mclaren-hart. com
EPA Contact:
Tim Rehder
Rocky Flats Project Coordinator
U.S. EPA Region 8
999 18th Street, Suite 500
Denver, CO 80202-2466
(303)312-6293
rehder.timothy@epa.gov
State Contact:
Steve Gunderson
CDPHE Rocky Flats Cleanup Agreement Coordinator
4300 Cherry Creek Dr. South
Denver, CO 80246-1530
(303) 692-3367
steve.gunderson@state.co.us
DOE Contact:
Hopi Salomon
Rocky Mountain Remediation Services, LLC
Rocky Flats Environmental Technology Site
P.O. Box 464
Golden, CO 80402-0464
(303) 966-2677
Fax: (303) 966-8244
Technology:
Vacuum-enhanced low temperature thermal desorption
IRV-100 system manufactured by McLaren-Hart
6 treatment chambers (18 feet long, 8 feet wide and 5 feet
high; operating capacity of 5yd3 per chamber)
Each chamber equipped with 16 propane units
Energy output of total system (infrared energy) -1.5 MM
Btu/hr
Vacuum condition in treatment chamber - 500 mm Hg
Air flow rate -1,000-3,000 cfm
Residence time - 5.25 hours
System throughput -1 yd3/hour
Soil temperature - 250ฐF
Emissions controls - two dry paniculate filters (in series), a
condenser, and a granular activated carbon unit
Type/Quantity of Media Treated:
Soil and debris - 3,796 cubic yards
Soils consist of sandy and clayey gravel
Moisture content approximately 8%
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Thermal Desorption at the Rocky Flats Environmental Technology Site,
Trenches T-3 and T-4, Golden, Colorado
Regulatory Requirements/Cleanup Goals:
Cleanup goals specified for 12 VOCs:
Goal of 6 mg/kg each for TCE, TCA, PCE, DCE, DCA, chloroform, carbon tetrachloride
Goal of 10 mg/kg each for benzene, ethylbenzene, toluene
Goal of 160 mg/kg for acetone and 30 mg/kg for methylene chloride
Results:
A total of 58 batches (3,796 yd3 total) of soil were treated during this application
Of the 58 batches treated, 52 met the cleanup goals on the first pass, including 20 batches where all 12 VOCs were
below the detection level
Six batches did not meet the cleanup goals on the first pass, exceeding the level for PCE; these batches were retreated
and met the cleanup goals
Concentrations of six VOCs (TCA, DCE, DCA, carbon tetrachloride, chloroform, and ethylbenzene) were below the
detection level in all 58 batches
According to the vendor, there were no exceedances of the applicable air emissions standards
Costs:
The total cost for this project was $1,934,203, including $1,328,600 in costs directly associated with the thermal
treatment
The calculated unit cost was $3 50/yd3 based on the treatment of the 3,796 yd3 of contaminated soil and debris
The original contract cost was $ 1,200,000, based on treating 2,200 yds3 of contaminated soil; two change orders were
issued for the remediation of additional soil volumes, changing the total amount of soil treated from 2,200 yd3 to 3,796
yd3, with a final project cost of $1,934,204
Description:
From 1951 to 1989, the U.S. Department of Energy (DOE) used the Rocky Flats site to process and store plutonium,
manufacture components for nuclear weapons, fabricate, machine, and assemble components from metals, and store
solvents used in the manufacturing processes. Hazardous and radioactive wastes were stored and disposed of at various
locations at the site, including on-site trenches. Waste handling practices at the site also included recycling of hazardous
materials. Trenches T-3 and T-4 were used for the disposal of sanitary sewage sludge contaminated with uranium and
plutonium and miscellaneous debris, primarily flattened drums contaminated with volatile organic compounds (VOCs),
uranium, and plutonium. Subsurface soils in trenches T-3 and T-4 were found to contain elevated levels of VOCs,
semivolatile organic compounds, and metals, along with low-level radiological contamination. A Proposed Action
Memorandum (PAM) was issued in January 1996 calling for thermal treatment of the T3/T4 soils. Prior to treatment, each
load of excavated soil was screened using a Field Instrument for the Detection of Low Energy Radiation (FIDLER) to
identify "potentially radiologically contaminated material". Soil with readings above 5,000 counts per minute (cpm) was
segregated and treated separately from the soil that was not considered to be potentially radioactive. A total of about 380
cubic yards of soil were identified as potentially radioactive.
The thermal desorber used at this site, an infrared radiation-heated unit manufactured by McLaren-Hart (the IRV-100
system), was a modular, batch-operated vacuum system, equipped with six treatment chambers. The system was operated
under a vacuum of approximately 500 mm Hg and soil was heated to temperatures of 250 ฐF. Thermal treatment
operations were conducted from June to August, 1996. A total of 58 batches (3,796 yd3 total) of soil were treated during
this application. Fifty-two of the batches met the cleanup goals on the first pass. The six batches that did not meet the
cleanup goals were retreated and met the cleanup goals. The total project cost was $1.9 million with the cost for the
thermal treatment application being $1.3 million or $350/yd3 (based on 3,796 yd3 of contaminated soil and debris).
According to vendor, the total project cost would likely be less for a similar application at sites where radiological
engineering controls were not required.
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64
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OTHER EX SITU SOIL TREATMENT ABSTRACTS
65
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Slurry Reactor Biotreatment of Explosives-Contaminated Soils at Joliet Army
Ammunition Plant, Joliet, Illinois
Site Name:
Joliet Army Ammunition Plant
Location:
Joliet, Illinois
Period of Operation:
July 1994 to August 1995
Cleanup Authority:
CERCLA
Final ROD scheduled for June 2001
Purpose/Significance of Application:
Use of bioslurry technology for treatment on explosives wastes
Cleanup Type:
Field demonstration
Contaminants:
Explosives
Excavated soils had concentrations of TNT -1,000 - 6,226 mg/kg; DNT - ND
- 360 mg/kg; TNB - 48 - 360 mg/kg; RDX - ND - 310 mg/kg; and HMX - ND
-215 mg/kg
Waste Source:
Process water from munitions washout
Contacts:
Technical Contacts:
J.F. Manning, Jr., R. Boopathy, and
E.R. Breyfogle
Argonne National Laboratory
Environmental Research Division
Bioremediation Group
9700 South Cass Avenue
Argonne, IL 60439-4843
Mark Hampton
U.S. Army Environmental Center
SFIM-AEC-ETD
Aberdeen Proving Ground, MD
21010-5401
(410) 436-6852
mark.hampton@aec.apgea.army.mil
EPA Remedial Project Manager:
Diana Mally
U.S. EPA Region 5
77 W. Jackson Blvd.
Chicago, IL 60604
(312)886-7275
E-mail: mally.diana@epa.gov
Technology:
In Situ Bioremediation
Field bioslurry system included a soil screening operation, four 420-gallon
bioslurry reactor tanks (variable speed drive mixer with double impeller); two
slurry dewatering beds; and tanks for water storage
Bioslurry demonstration was performed in the reactors (350-380 gals/reactor),
with addition of molasses, pH adjustment (to >6), and aerobic-anoxic
operating cycles
Four reactors were operated: (1) a control with no molasses; (2) a 20% weekly
replacement; (3) a 10% weekly replacement; and (4) a 5% daily replacement
All reactors were operated with a 10-16% WAV soil slurry in a sequencing
batch mode
Soil was screened to 40 mesh (0.0165 inch) prior to placement in the reactors
Type/Quantity of Media Treated:
Soil
Regulatory Requirements/Cleanup Goals:
Determine effectiveness and cost of bioslurry systems for degrading explosives in soil
Evaluate a field-scale system for mechanical integrity and ability to enrich a microbial consortium, and to analyze
system performance over an extended operating period
A target goal of 20 mg/kg for TNT was used for the demonstration, since a cleanup goal had not yet been established
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Slurry Reactor Biotreatment of Explosives-Contaminated Soils at Joliet Army
Ammunition Plant, Joliet, Illinois
Results:
Removed more than 99% of explosives from the soil
The 20% weekly replacement reactor (soil retention time of 5 weeks), when operated at >25ฐC, degraded TNT to <50
mg/kg and DNT to < 100 mg/kg, and RDX and TNB to <10 mg/kg; the report does not indicate if this reactor met the
target goal for TNT
The 10% weekly replacement reactor (soil retention time of 10 weeks), when operated at >25ฐC, degraded TNT to <20
mg/kg and DNT to <10 mg/kg, and RDX and TNB to <10 mg/kg
The 5% daily replacement reactor (soil retention time of 5 weeks) had performance similar to that of the 20% weekly
replacement reactor, and removed TNT to <20 mg/kg
The control reactor (no molasses addition) showed no explosives removed from the soil
Costs:
Projected costs for full-scale implementation of the slurry-phase biotreatment system was $290-350/yd3
Description:
Joliet Army Ammunition Plant was constructed in Will County, Illinois, approximately 17 miles south of Joliet, in the early
1940's. JAAP contains two major functional areas - a manufacturing area for production of constituent chemicals and
explosive materials, covering 14 square miles, and a load-assemble-package (LAP) area for munitions filling and assembly
lines, storage magazines, and demilitarization, covering 27 square miles. In April 1989, the LAP area was added to the
NPL. Soil for a field demonstration of bioslurry technology was obtained from Group 61, Site LI of the LAP Area, a
ridge-and-furrow area that received pink water from washout of munitions.
The field demonstration showed that bioslurry technology could reduce concentrations of TNT and other explosives in
soil. The important process parameters are the need for an organic co-substrate (molasses), operation of the reactors in an
aerobic-anoxic sequence, and temperature. In warmer temperatures (>25ฐC), operation of the system at >20% weekly
replacement will achieve removal of explosives. Colder temperatures did not destroy the microbial activity, but did slow
the metabolic rate. In particular, degradation of TNT continued with the accumulation of DNT. The reactors were
operated successfully at lower replacement rates (< 10% weekly) in colder weather. The treated soil (bioslurry) can be
applied directly to land and will not affect plant growth.
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Joint Small Arms Range Remediation (Physical Separation and Acid Leaching)
at Fort Polk Range 5, Leesville, Louisiana
Site Name:
Fort Polk Range 5
Location:
Leesville, Louisiana
Period of Operation:
August - December, 1996
Cleanup Authority:
RCRA
Purpose/Significance of Application:
Demonstration of physical separation and acid leaching to treat metals in soil
Cleanup Type:
Field demonstration
Contaminants:
Heavy Metals - Lead
Stockpiled untreated soil had a lead assay of 0.5%
Waste Source:
Small arms testing
Contacts:
Vendor Contacts:
Acetic Acid Leaching:
Thomas Leggiere
ContracCon Northwest Inc
Hydrochloric Acid Leaching:
Craig Jones
Brice Environmental Corporation
Army Contacts:
Richard O'Donell
Lisa Miller
Army Environmental Center
Technology:
Physical separation and acid leaching
Demonstration included two vendors - one used physical separation and acetic
acid (weak acid) leaching; the other used physical separation and hydrochloric
acid (strong acid) leaching
Physical separation for both vendors included screening to remove oversize
debris, including bullets and bullet fragments; hydrodynamic separation;
density separation; froth flotation; and magnetic separation
Following separation, the soil was mixed with the acid in a tank; for the acetic
acid leaching, three tanks were used in series; for the hydrochloric acid
leaching, one mix tank was used
The treated soil slurry was separated from the leachate and dewatered (filter
press); leachate was regenerated (preciptiation)
Average processing rate - 2.8 tons/hr (acetic acid) and 6.3 tons/hr
(hydrochloric acid)
Type/Quantity of Media Treated:
Soil
Acetic acid leaching process - 263 tons
Hydrochloric acid leaching process - 835 tons
Regulatory Requirements/Cleanup Goals:
TCLPforleadof5ug/L
Total metals concentration for lead, copper, zinc, and antimony -1,000 mg/kg each for acetic acid leaching and 500
mg/kg each for hydrochloric acid leaching
Results:
Soil from physical separation alone was tested for TCLP lead; did not meet cleanup criteria
Acetic Acid Leaching:
- Initially, approximately 93% total lead, 93% total copper, 77% total zinc, and 70% total antimony removed
- During the demonstration, both total and leachable lead levels in treated soil rose due to buildup of lead in
regenerated leachate as a result of inadequate precipitation
- Total lead was reduced from 2,828 mg/kg in untreated soil to 122-1,443 mg/kg in processed soil; data on TCLP lead
levels was not provided
Hydrochloric Acid Leaching:
- Met both total and TCLP lead targets throughout demonstration
- Removed 96% total lead, 97% total copper, 89% total zinc, and 60% total antimony
- Total lead was reduced from 4,117 mg/kg in untreated soil to 165 mg/kg in treated soil
- Average TCLP lead level in treated soil was 2 mg/L
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Joint Small Arms Range Remediation (Physical Separation and Acid Leaching)
at Fort Polk Range 5, Leesville, Louisiana
Costs:
Costs from the acid leaching demonstration were not analyzed because of the operational difficulties experienced with
leachate regeneration
Costs for physical separation and hydrochloric acid leaching demonstration were $ 1,400/ton for the 83 5 tons of soil
processed
Projected full-scale costs for physical separation and hydrochloric acid leaching are $ 170/ton based on 10,000 tons of
soil
Description:
A demonstration of physical separation and acid leaching of soil from a small arms testing range at Fort Polk was
conducted from August to December, 1996. Two types of acid leaching were demonstrated - one using acetic acid to
demonstrate a weak acid and one using hydrochloric acid to demonstrate a strong acid. Soil containing heavy metals was
excavated from the small arms range and stockpiled for the demonstration. The soil was sent through physical separation
followed by acid leaching. The treated soil was separated from the leachate, and dewatered; the leachate was regenerated
and reused in the process.
Results showed that treating soil using physical separation alone did not meet the cleanup goals. While the acetic acid
leaching initially removed metals, operational problems with the regeneration of the leachate resulted in increasing levels
of lead in the treated soil. The hydrochloric acid leaching process met the cleanup goals for all metals throughout the
demonstration. Projected full-scale costs for physical separation and hydrochloric acid leaching are $ 170/ton based on
10,000 tons of soil treated.
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Thermo NUtech's Segmented Gate System at Los Alamos National Laboratory
Technical Area 33, Los Alamos, New Mexico
Site Name:
Los Alamos National Laboratory Technical Area 33
(Report also addresses testing from Site TA-15)
Location:
Los Alamos, New Mexico
Period of Operation:
April 28^ May 19, 1999
(soil processing on 15 days)
Cleanup Authority:
Voluntary Corrective Action
Purpose/Significance of Application:
Use of a gate system to reduce volume of radioactive-contaminated soil
requiring off-site disposal
Cleanup Type:
Full scale
Contaminants:
Natural Uranium (NU) and Depleted Uranium (DU)
Concentrations reported as high as 431.46 pCi/g
Waste Source:
Nuclear weapon production operations
Contacts:
Vendor:
Joe Kimbrell
Thermo NUtech
Albuquerque, NM
(505) 254-0935 ext. 209
Management Support:
Ray Patteson, Sandia National
Laboratories, (505) 884-1904
John McCann, Los Alamos National
Laboratory, (505) 665-1091
Technology:
Segmented Gate System (SGS)
SGS is a combination of conveyor systems, radiation detectors (primarily
gamma radiation), and computer control used to segregate waste by
contamination level
Detectors monitored radioactivity content of soil traveling on belt and
computer opened specified gates to separate portions of soil based on
radioactivity criteria
Contaminated soil on conveyor belt was diverted by segmented gates into
stockpiles
Operating parameters included a belt speed of 30 ft/min, belt length of 16 -18
ft, soil layer thickness of 2 in by width of 30.75 in, and soil density of 1.02
g/cm3
Total soil processing time was 91.1 hrs; average daily operational time was
6.48 hrs
Oversize debris and rock pre-screened
Type/Quantity of Media Treated:
Soil and Debris
2,526 yds3 of soil were processed
Soil moisture content estimated as 12-15%
Regulatory Requirements/Cleanup Goals:
Reduce the volume of contaminated soil by separating soil that was above the specified criteria and that would require
off-site storage and disposal, from soil that was below the criteria
The sorting criterion was 50 pCi/g
Results:
Overall volume reduction of contaminated soil was 91.64%; approximately 350 yds3 of above-criteria soil required off-
site disposal
Average activities for soil from Sites C33-003, C33-010, and C33-007b were: above-criteria 318, 431.46, and 165.89
pCi/g, respectively, and below-criteria soil: 3.2, 44.8, and 9.88 pCi/g
Costs:
Actual cost for SGS was $275,745, including $6,600 for pre-deployment activities, $46,000 for mobilization, $185,445
for processing, $35,000 for demobilization, and $2,700 for final report
Additional costs incurred by LANL were $543,400, including for staff, prime contractor, G&A, and soil disposal
Overall unit cost of SGS was $ 109/yd3 of soil processed
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Thermo NUtech's Segmented Gate System at Los Alamos National Laboratory
Technical Area 33, Los Alamos, New Mexico
Description:
Los Alamos National Laboratory (LANL) is a 43-square mile multi-disciplinary research facility owned by the U.S. DOE
and located in north-central New Mexico. Technical Area 33 (TA-33), located in the eastern portion of LANL, is an active
testing area. TA-33 was used to test initiators (components of nuclear weapons) from 1947 to the 1950's. This report
focused on remediation of uranium-contaminated soil and debris from Potential Release Sites (PRSs) 33-007(b), 33-
010(c), and C33-003 in TA-33. Historical records indicate that natural uranium (NU) and depleted uranium (DU) are
present at these sites.
A Segmented Gate System (SGS) was used to reduce the volume of radioactive-contaminated soil that required off-site
disposal. SGS is a combination of conveyor systems, radiation detectors, and computer control, where contaminated soil
on a conveyor belt is diverted by segmented gates into stockpiles by contamination level. Detectors monitor the
radioactivity content of the soil traveling on the belt and a computer opens specified gates to separate portions of the soil
based on radioactivity criteria. At this site, the overall volume reduction was measured as 91.64%. The actual cost for the
application was $275,745, including $185,445 for processing. This corresponded to an overall unit cost of $109/yd3 based
on 2,526 yd3. During the demonstration, delays were caused by operational failures from hydraulic systems.
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Thermo NUtech's Segmented Gate System at Pantex Plant, Firing Site 5, Amarillo,
Texas
Site Name:
Pantex Plant, Firing Site 5
Location:
Amarillo, Texas
Period of Operation:
March 27-May 1, 1998
(soil processing from April 17 -April 19, 1999)
Cleanup Authority:
RCRA Corrective Action
Purpose/Significance of Application:
Use of a gate system to reduce volume of radioactive-contaminated soil
requiring off-site disposal
Cleanup Type:
Full scale
Contaminants:
Depleted Uranium (DU)
- Concentrations reported as high as 567 pCi/g
Waste Source:
Firing range for test shots of depleted
uranium and explosives
Contacts:
Site Contact:
Martin Amos, Battelle Pantex
(806) 477-6458
Vendor:
Scott Rogers, Thermo Nutech
(423) 481-0683
Management Support:
Tom Burford, Sandia National Laboratories,
(505) 845-9893
Technology:
Segmented Gate System (SGS)
SGS is a combination of conveyor systems, radiation detectors
(primarily gamma radiation), and computer control used to
segregate waste by contamination level
Detectors monitored radioactivity content of soil traveling on belt
and computer opened specified gates to separate portions of soil
based on radioactivity criteria
Contaminated soil on conveyor belt was diverted by segmented
gates into stockpiles
Operating parameters included a belt speed of 30 ft/min, belt length
of 16 -18 ft, soil layer thickness of 2 in by width of 30.75 in, and
soil density of 1.0 g/cm3
Average daily operational time was 2.67 hrs
Oversize debris and rock pre-screened
Type/Quantity of Media Treated:
Soil and Debris
294 yds3 of soil were processed
Soil moisture content estimated as 17%
Regulatory Requirements/Cleanup Goals:
Reduce the volume of contaminated soil by separating soil that was above the specified criteria and that would require
off-site storage and disposal, from soil that was below the criteria
The sorting criterion was 50 pCi/g
Results:
Overall volume reduction of contaminated soil was 38.5%; approximately 180.8 yds3 of above-criteria soil required off-
site disposal
Average activities ranged from 125 - 213 pCi/g for above-criteria soil and 20 - 54 pCi/g for below-criteria soil
Costs:
Actual cost for SGS was $203,887, including $18,768 for regulatory and compliance issues, $103,015 for mobilization,
$32,594 for soil processing, and $49,510 for demobilization
Additional costs incurred by LANL were for site preparation, excavation, oversight labor, health physics support,
sample analysis, and waste disposal (specific cost data not provided)
Unit cost of SGS was $ 11 I/yd3 based on 294 yd3 of soil
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Thermo NUtech's Segmented Gate System at Pantex Plant, Firing Site 5, Amarillo,
Texas
Description:
Firing Site 5 (FS-5) is within the boundaries of the Pantex Plant, located northeast of Amarillo, Texas. The site was used
to conduct test shots of combined explosives and depleted uranium. The firing site was surrounded on three sides by an
earthen berm 10 ft high and 33 ft thick at the base. Soil at the site was contaminated with depleted uranium (DU).
A Segmented Gate System (SGS) was used to reduce the volume of radioactive-contaminated soil that required off-site
disposal. SGS is a combination of conveyor systems, radiation detectors, and computer control, where contaminated soil
on a conveyor belt is diverted by segmented gates into stockpiles based on contamination level. Detectors monitor the
radioactivity content of the soil traveling on the belt and a computer opens specified gates to separate portions of the soil
based on radioactivity criteria. At this site, the overall volume reduction for the first 294 yds3 of soil treated was measured
as 38.5%, and the results were determined to be unsatisfactory; processing was terminated at this time. The actual cost for
the application was $203,887, including $32,594 for soil processing. This corresponded to a unit cost of $11 I/yd3 for soil
processing. Lessons learned included problems with using a hand survey method for classifying soil, which resulted in
misclassifying soil as above the SGS criterion, and the method used each day to cover and uncover the piles.
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Thermo NUtech's Segmented Gate System at Sandia National Laboratories, ER Site
16, Albuquerque, New Mexico
Site Name:
Sandia National Laboratories, ER Site 16
Location:
Albuquerque, New Mexico
Period of Operation:
February-March 1998
(soil processing from February 27 -
March 5, 1998)
Cleanup Authority:
RCRA Corrective Action
Part B permit issued 8/93
Regulatory Authority:
New Mexico Environment Department
Purpose/Significance of Application:
Use of a gate system to reduce volume of radioactive-contaminated soil
requiring off-site disposal
Cleanup Type:
Full scale
Contaminants:
Depleted Uranium (DU)
Concentrations reported as high as 4,100 pCi/g
Waste Source:
Dump Site
Contacts:
Site Contact:
Tom Burford
Sandia Corporation
DOE/AL
(505) 845-9893
Vendor:
Scott Rogers
Thermo NUtech
A ThermoRetec Company
4501 Indian School Road ME, Suite
G105
Albuquerque, NM 87110
(505) 424-3072
Technical Support:
Sue Collins
Sandia National Laboratories
(505) 284-2546
Technology:
Segmented Gate System (SGS)
SGS is a combination of conveyor systems, radiation detectors (primarily
gamma radiation), and computer control
Contaminated soil on conveyor belt was diverted by segmented gates into
stockpiles
Detectors monitored radioactivity content of soil traveling on belt and
computer opened specified gates to separate portions of soil based on
radioactivity criteria
Operating parameters included a belt speed of 30 ft/min, belt length of 16 -
18 ft, soil layer thickness of 2 in by width of 30.75 in, and soil density of
1.0 g/cm3
Average daily processing time was 4.7 hrs, less than the target of 7 hrs
Oversize debris and rock pre-screened using a field grizzly (vertical bar grate)
and hammermill
Type/Quantity of Media Treated:
Soil
661.8 yds3 of soil were processed
Soil identified as silty sands, containing 35-45% silt and clay; moisture
content estimated as 10%
Regulatory Requirements/Cleanup Goals:
Reduce the volume of contaminated soil by separating soil that was above the specified criteria and that would require
off-site storage and disposal, from soil that was below the criteria
The sorting criterion was 54 pCi/g
Results:
Overall volume reduction of contaminated soil was 99.9%; 358 kg of above-criteria soil required off-site disposal
After first pass, average activity of above-criteria soil was 406.5 pCi/g and below-criteria soil 4.2 pCi/g
Costs:
Actual cost was $164,109, including $59,326 for mobilization, $57,770 for operations, and $47,013 for demobilization
Overall unit cost was $236/yd3 of soil processed, reflecting the relatively small amount of soil processed
Additional activities included site preparation, operation of crane, excavation, oversight labor, health physics support,
water supply, sample analysis, and waste disposal
74
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Thermo NUtech's Segmented Gate System at Sandia National Laboratories, ER Site
16, Albuquerque, New Mexico
Description:
Sandia National Laboratories' Environmental Restoration (ER) Site 16 is located northeast of the Technical Area III/V
complex, within Kirtland Air Force Base. The site covers 25 acres and was an open dumping ground for concrete and
other rubble. The concrete and rubble was presumed to be the source on contamination. Approximately 1/3 acre was
excavated for the project from the side and bottom of an arroyo, after the removal of larger debris.
A Segmented Gate System (SGS) was used to reduce the volume of radioactive-contaminated soil that required off-site
disposal. SGS is a combination of conveyor systems, radiation detectors, and computer control, where contaminated soil
on a conveyor belt is diverted by segmented gates into stockpiles. Detectors monitor the radioactivity content of the soil
traveling on the belt and a computer opens specified gates to separate portions of the soil based on radioactivity criteria.
At this site, the overall volume reduction was measured as 99.9%. The actual cost for the application was $164,109,
including $59,326 for mobilization, $57,700 for operations, and $47,013 for demobilization. This corresponded to an
overall unit cost of $236/yd3. Lessons learned included impacts from startup requirements, jams in the screen/hammermill
caused by larger rocks, and soil buildup in the gas chutes.
75
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Thermo NUtech's Segmented Gate System at Sandia National Laboratories, ER Site
228A, Albuquerque, New Mexico
Site Name:
Sandia National Laboratories, ER Site 228A
Location:
Albuquerque, New Mexico
Period of Operation:
July-November 1998
(soil processing from November 6-17, 1998)
Cleanup Authority:
Not identified
Purpose/Significance of Application:
Use of a gate system to reduce volume of radioactive-contaminated soil
requiring off-site disposal
Cleanup Type:
Full scale
Contaminants:
Depleted Uranium (DU)
Concentration not provided
Waste Source:
Burial pits
Contacts:
Site Contact:
Sandia Corporation
DOE/AL
Vendor:
Thermo NUtech
A ThermoRetec Company
4501 Indian School Road ME, Suite G105
Albuquerque, NM 87110
Technical Support:
Sue Collins
Sandia National Laboratories
(505) 284-2546
Technology:
Segmented Gate System (SGS)
SGS is a combination of conveyor systems, radiation detectors
(primarily gamma radiation), and computer control
Contaminated soil on conveyor belt was diverted by segmented gates
into stockpiles
Detectors monitored radioactivity content of soil traveling on belt and
computer opened specified gates to separate portions of soil based on
radioactivity criteria
Operating parameters included a belt speed of 30 ft/min, belt length of
16-18 ft, soil layer thickness of 2 in by width of 30.75 in, and soil
density of 1.29 g/cm3
Average daily processing time was 4.47 hrs, less than the target of
7hrs
Oversize debris and rock pre-screened using a field grizzly (vertical
bar grate) and hammermill
Type/Quantity of Media Treated:
Soil
1,352 yds3 of soil were processed
Extended 0.4 acres at a depth of 2 ft
Soil identified as sandy, moisture content estimated as 10%
Regulatory Requirements/Cleanup Goals:
Reduce the volume of contaminated soil by separating soil that was above the specified criteria and that would require
off-site storage and disposal, from soil that was below the criteria
The sorting criterion was 27 pCi/g
Results:
Overall volume reduction was measured as 99.56%; 21 55-gallons drums of above-criteria soil required off-site disposal
Average activity of above-criteria soil was 223 pCi/g and below-criteria soil 14.77 pCi/g
5.2 yds3 of soil from Burn Site showed volume reduction of 99.4%
Costs:
Actual cost was $220,040, including $29,000 for excavation and pre-screening, $41,300 for mobilization, $117,000 for
operations, and $32,340 for demobilization
Overall unit cost was $154/yd3, reflecting the relatively small quantity of soil processed
Project contracted as a lump sum fixed price; did not include excavation, oversight labor, health physics support, water
supply, fuel services, generator support, sample analysis, and waste disposal
76
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Thermo NUtech's Segmented Gate System at Sandia National Laboratories, ER Site
228A, Albuquerque, New Mexico
Description:
Environmental Restoration (ER) Site 228A, the Centrifuge Dump Area and Tijeras Arroyo Operative Unit-ADS 1309, is
located 500 ft east of Technical Area II, within Kirtland Air Force Base. In July 1997, heavy rains eroded a portion of a
depleted uranium burial from the Tijeras Arroyo rim. Depleted uranium mixed with soil and debris washed down the
slope.
A Segmented Gate System (SGS) was used to reduce the volume of radioactive-contaminated soil that required off-site
disposal. SGS is a combination of conveyor systems, radiation detectors, and computer control, where contaminated soil
on a conveyor belt is diverted by segmented gates into stockpiles. Detectors monitor the radioactivity content of the soil
traveling on the belt and a computer opens specified gates to separate portions of the soil based on radioactivity criteria.
At this site, the overall volume reduction was measured as 99.56%. The actual cost for the application was $220,040,
including $29,000 for excavation and pre-screening, $41,300 for mobilization, $117,000 for operations, and $32,340 for
demobilization. This corresponded to an overall unit cost of $154/yd3. Lessons learned included impacts from weather
delays and equipment concerns, and difficulties with rocks that were 3 inches in diameter.
77
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Thermo NUtech's Segmented Gate System at Tonapah Test Range, Clean Slate 2,
Tonapah, Nevada
Site Name:
Tonapah Test Range, Clean Slate 2
Location:
Tonapah, Nevada
Period of Operation:
May 4^ June 12, 1998
(soil processing from May 18 - June 3, 1999)
Cleanup Authority:
RCRA Corrective Action
Purpose/Significance of Application:
Use of a gate system to reduce volume of radioactive-contaminated soil
requiring off-site disposal
Cleanup Type:
Field demonstration
Contaminants:
Plutonium
- Concentrations reported as high as 1,100 pCi/g
Waste Source:
Weapons test range
Contacts:
Vendor:
Scott Rogers, Thermo Nutech, (423) 481-0683
Management Support:
Tom Burford, Sandia National Laboratories,
(505) 845-9893
Technical Contact:
Mike Hightower, Sandia National Laboratories,
(505) 844-5499
Technology:
Segmented Gate System (SGS)
SGS is a combination of conveyor systems, radiation detectors
(primarily gamma radiation), and computer control used to segregate
waste by contamination levels
Detectors monitored radioactivity content of soil traveling on belt
and computer opened specified gates to separate portions of soil
based on radioactivity criteria
Contaminated soil on conveyor belt was diverted by segmented gates
into stockpiles, based on the criteria
Operating parameters included a belt speed of 30 ft/min, belt length
of 16 -18 ft, soil layer thickness of 1 - 2 in by width of 30.75 in, and
soil density of 1.0 g/cm3
Oversize debris and rock were pre-screened
Type/Quantity of Media Treated:
Soil and Debris
333 yds3 of soil were processed
Soil was primarily sand and silt with some gravel and cobbles; soil
type and moisture content optimal for SGS operation
Regulatory Requirements/Cleanup Goals:
Reduce the volume of contaminated soil by separating soil that was above the specified criteria and that would require
off-site storage and disposal, from soil that was below the criteria
The sorting criterion was 50 -1,500 pCi/g; demonstration results were to be used to define optimum operating
parameters
Results:
79 runs were conducted, each characterized by different soil activity levels, operating parameters, and end points
(sorting criterion)
Results showed that optimum separation criteria for soils with <400 pCi/g was about 300 pCi/g, resulting in a volume
reduction of 60% and an average clean soil activity of 160 pCi/g
Soils between 400 - 800 pCi/g did not appear to have an optimum separation criterion, and had a volume reduction of
30 - 40% and an average clean soil activity of 250 pCi/g
Soils >800 pCi/g did not appear to have an optimum separation criterion, and had a volume reduction of 30% and an
average clean soil activity of 500 pCi/g; this clean soil activity was too high and suggested that processing soil with
>800 pCi/g would probably not be appropriate
Costs:
Actual cost for SGS was $138,126, including $8,203 for regulatory and compliance issues, $29,614 for mobilization,
$78,545 for physical treatment, and $21,764 for demobilization
78
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Thermo NUtech's Segmented Gate System at Tonapah Test Range, Clean Slate 2,
Tonapah, Nevada
Description:
Tonapah Test Range is a DOE and DoD weapons testing range. The Clean Slate-2 soil remediation site of the range is in
the northwest portion of Nellis Air Force Base. In 1963, a series of four nuclear weapons, component, and explosive
vulnerability destruction experiments, known as Operation Roller Coaster, were conducted at the range. These
experiments left varying levels of finely dispersed plutonium at the site. Approximately 32,000 yds3 of soil in Clean Site-2
are contaminated, with the site still being characterized.
A Segmented Gate System (SGS) was used to reduce the volume of radioactive-contaminated soil that required off-site
disposal. SGS is a combination of conveyor systems, radiation detectors, and computer control, where contaminated soil
on a conveyor belt is diverted by segmented gates into stockpiles based on contamination levels. Detectors monitor the
radioactivity content of the soil traveling on the belt and a computer opens specified gates to separate portions of the soil
based on radioactivity criteria. At this site, 79 periods of operation (runs) were conducted, each characterized by different
soil activity levels, operating parameters, and end points (sorting criterion) ranging from 50 to 1,500 pCi/g. Results
showed that optimum separation criteria for soils with <400 pCi/g was about 300 pCi/g, resulting in a volume reduction of
60% and an average clean soil activity of 160 pCi/g. Soils >400 pCi/g did not appear to have an optimum separation
criterion. Results suggested that processing soil with >800 pCi/g would probably not be appropriate for the SGS. Actual
cost for SGS was $138,126, including $78,545 for soil processing. Results from these tests were used to develop potential
treatment scenarios for the SGS at Clean Slate-2. Lessons learned covered topics such as the need for accurate site
characterization data and the benefits of selective excavation of hot spots.
79
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Chemical Extraction for Uranium Contaminated Soil at the RMI Titanium
Company Extrusion Plant, Ashtabula, Ohio
Site Name:
RMI Titanium Company Extrusion Plant
Location:
Ashtabula, Ohio
Period of Operation:
January 7, 1997 - February 14, 1997
Cleanup Authority:
NRC
Purpose/Significance of Application:
Demonstration of chemical leaching process for treatment of uranium-
contaminated soil
Cleanup Type:
Field demonstration
Contaminants:
Radionuclides - Uranium
Most uranium present as U+236
Uranium levels in feed soil were 74-146 pCi/g
Waste Source:
Particulates from uranium extrusion
operations
Contacts:
DOE Contacts:
Ward Best, DOE Ashtabula Area
Office, (216) 993-1944
Jeff Kulpa, RMI Environmental
Services, (216) 993-2804
Erik Groenendijk, ART pilot project
manager, (813) 264-3529
Mike Hightower
Sandia National Laboratories
Telephone: (505) 844-5499
Fax:(505)844-0116
E-mail: mmhight@sandia.gov
EPA Contact:
Brian Nickel
Ohio EPA
401 East Fifth Street
Dayton, OH 45402-2911
Telephone: (513) 285-6357
Fax:(513)285-6249
Technology:
Chemical Extraction
Process involves application of heated bicarbonate solution to soil in a rotary
reactor, liquid/soils separation, dewatering, and ion exchange to remove
uranium from liquid
Solution was 0.2 M NaHCO3 at a 115ฐF and retention time of 1.5 hrs; reactor
was a 5 yd3 cement mixer
Processed 1 to 2 tons of soil/batch, using a 30% solids slurry
Type/Quantity of Media Treated:
Soil
64 tons (3 8 batches)
high clay content silt loams and clay loams; low organic material
Regulatory Requirements/Cleanup Goals:
Evaluate process performance, such as ability to meet a 30 pCi/g free release standard and achieve a significant volume
reduction of the waste
Results:
Treated soil from two areas of the plant had 12-14 pCi/g of uranium, with removal efficiencies of 87-91%
Treated soil from another area of the plant had 27-47 pCi/g; the higher concentrations was attributed to high feed
concentrations from a hot spot with 587 pCi/g
Volume reduction was 95%; less than 5% residual waste required off-site disposal
Average feed concentration to ion exchange was 16 ppm and output 1.7 ppm, resulting in a 91% removal efficiency
Costs:
The total cost for the pilot plant was $638,670, including mobilization and preparatory work; monitoring, sampling,
testing, and analysis; chemical treatment; decontamination and decommissioning; disposal commercial; demobilization;
and data compilation and report writing
The report authors indicate that a linear relationship does not exist between pilot plant and full-scale costs
Full-scale costs were estimated to range from $250-350 per ton of soil treated
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Chemical Extraction for Uranium Contaminated Soil at the RMI Titanium
Company Extrusion Plant, Ashtabula, Ohio
Description:
From 1962 to 1988, the RMI Titanium Company (RMI) performed uranium extrusions operations for the U.S. DOE at its
plant in Ashtabula, Ohio. The uranium metal processed at the site included deleted and slightly enriched material that was
used in nuclear and non-nuclear weapons. During the early years of extrusion and machining, paniculate uranium was
generated and discharged from roof vents and stacks and settled on surrounding soils. A test of a carbonate extraction
process was conducted to leach uranium from contaminated soils.
Thirty-eight batches of 1-2 tor^atch were treated in a pilot-scale test of a chemical extraction process, through DOE's
ITRD program. Treated soil had an overall removal efficiency of approximately 82% with a volume reduction of 95%;
less than 5% of residual waste required off-site disposal. Difficulties with meeting the cleanup goal were identified only
when treating soil from a hot spot. The total cost for the pilot plant was $638,670, and full-scale costs were estimated as
$250-3 50/ton.
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Transportable Vitrification System at Oak Ridge National Laboratory,
Oak Ridge, Tennessee
Site Name:
Oak Ridge National Laboratory (ORNL)
Location:
Oak Ridge, TN
Period of Operation:
October 1997
Cleanup Authority:
RCRA and NRC
Purpose/Significance of Application:
Demonstration of a transportable vitrification system to treat low-level mixed
waste sludges
Cleanup Type:
Field demonstration
Contaminants:
Metals and Radionuclides
Waste Source:
Mixed low-level waste sludges from
DOE operations - included pond
sludge and sludge from a
neutralization facility
Contacts:
Principal Investigator:
Frank Van Ryn
Bechtel Jacobs Company
ORNL
P.O. Box 2003
Oak Ridge, TN 37831
Telephone: 423-574-1907
Fax: 423-574-9786
E-mail: xs2@ornl.gov
DOE Technical Program Manager:
Dave Hutchins
Environmental Technology Group,
EM-93
U.S. DOE, Oak Ridge Operations
Office
P.O. Box 2001
Oak Ridge, TN 37831
Telephone: 423-241-6420
Fax: 423-576-5333
E-mail: hutchinsda@oro.doe.gov
Technology:
Vitrification
Transportable Vitrification System (TVS):
Waste and Additives and Materials Processing Module - 240-gal melter feed
blend tank equipped with a load cell and agitator, centrifugal pump, feed tank,
melter module, and emission control module
Melter Module - joule-heated glass melter equipped with molybdenum rod
electrodes and lined with heavy flux contact refractory
Melter capacity - up to 300 Ib/hr; operating temperature -1,150 to 1,400ฐC;
heated with a 500,000-BTU/hr propane burner
Melter equipped with a drain bay chamber to remove waste glass and salt tap
side chamber to remove corrosive salts
Waste glass poured from drain bay chamber into 8-cubic foot stainless steel
containers
Emission Control Module included quench tower, packed bed cooler, variable
throat venturi, mist eliminator, reheater, and high-efficiency paniculate air
filters
Control and Services Module - used to control and monitor equipment
operation
Type/Quantity of Media Treated:
Sludge
Pond sludge and mixtures of pond and neutralization sludge -16,000 Ibs
Regulatory Requirements/Cleanup Goals:
RCRA Land Disposal Restriction (LDR) standards and NRC guidelines
Air emissions limits were specified in a State of Tennessee air permit
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In situ Bio remediation Using Molasses Injection at an Abandoned Manufacturing
Facility, Emeryville, California
Results:
The waste form produced by the TVS met the RCRA LDR standards and NRC guidelines, was stable and durable, and
represented a 60% volume reduction of the waste
The TVS system operated within the required emissions limits
The melting rate decreased during the demonstration, resulting in lower average throughput rate (450 kg/day versus
expected 900 kg/day); attributed to high iron content of waste which decreased heat transfer characteristics of glass
material
Costs:
Projected costs for a full-scale system include:
- Capital costs, including all equipment - $5 million
- Operating costs - $10 to $44/kg of waste, assuming analytical expenses similar to those incurred for the
demonstration; assuming less extensive analytical requirements for normal operations, operating costs were estimated
at$7to$17/kgofwaste
Description:
In October 1997, following completion of process development and testing, demonstration of the TVS was conducted at
ORNL, using actual low-level mixed waste containing metals. The waste used for the demonstration was B&C pond
sludge and a mix of B&C pond sludge and sludge from a neutralization facility. The objectives of the demonstration
included meeting the RCRA LDR standards and NRC guidelines for the glass waste form, meeting the air emissions limits
for the operation of the TVS, and collecting operating and performance data for the process for use in scale-up.
The results of the demonstration showed that the TVS was capable of treating low-level mixed waste sludges to the RCRA
LDR levels and the NRC guidelines, and of operating within the required air emission standards. The waste form
produced by the TVS was highly durable with long-term integrity, and significant reductions in waste volumes were
achieved. For different waste compositions from those tested, additional process development would be required to
determine the process controls and scale-up methods needed to achieve optimal glass waste forms, consistent melter
operation, and to avoid adverse melter conditions. Treatability studies are recommended for any waste stream to be treated
using TVS.
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PUMP AND TREAT ABSTRACTS
85
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Groundwater Extraction and Treatment at the Logistics Center Operable Unit,
Fort Lewis, Washington
Site Name:
Fort Lewis Logistics Center Operable Unit
Location:
Fort Lewis, Washington
Period of Operation:
August 1995 - ongoing
Cleanup Authority:
CERCLA Remedial Action
Record of Decision (ROD) signed on
September 25, 1990
Purpose/Significance of Application:
Use of two groundwater extraction systems to remove VOCs and treat using air
stripping.
Cleanup Type:
Full scale
Contaminants:
Organic Compounds, Halogenated (Chlorinated Solvents) - TCE and DCE
Maximum TCE concentration in groundwater is greater than 100,000 mg/L.
Waste Source:
Disposal of waste solvents in surface
trenches, including disposal of free
liquids and disposal of drums
containing liquids
Contacts:
Project Management:
Project Manager
Mr. Bill Goss
USACE, Seattle District
4735 Marginal Way, South
O&M Contractor:
URS Greiner Woodward-Clyde
2401 Fourth Avenue, Suite 1000
Seattle, Washington 98121
LTM - Kelly Teague
(206)674-7931
O&M-SteffranNeff
(206) 343-7933
Regulatory Contact:
Mr. Bob Kievit
U.S. EPA Region X
Washington Operations Office
300 Desmond Drive, Suite 102
Lacey, Washington 98503
(360) 753-9014
Technology:
Groundwater is extracted via two well fields located at the suspected main
contaminant source area (The East Gate system), and from a line of wells
located down gradient of the source areas (The 1-5 system)
Extracted groundwater is treated by air stripping
Treated groundwater is recharged to the subsurface via wells and infiltration
galleries near each extraction area
Type/Quantity of Media Treated:
2.147 Million gallons of water extracted, treated and recharged as of 8/98
2772 pounds of TCE removed as of 9/97
Regulatory Requirements/Cleanup Goals:
Groundwater extracted at the Logistics Center Site is required to be treated to drinking water standards (MCLs) prior to
recharge to the subsurface for the contaminants of concern: TCE - 5 mg/L; DCE - 70 mg/L
Air emissions from the treatment systems are required to be below 75 pounds per month (1-5) and 325 pounds per
month (East Gate), respectively
Results:
Effluent sampling at each air stripper indicates that TCE concentrations in the treated groundwater are consistently
below the treatment requirement of 5 mg/L. Several samples collected during the first few months of operation for the
East Gate system contained TCE in concentrations exceeding 5 mg/L, however, operations have since been modified to
improve performance of this system. No results above MCLs have been observed since October 1995. TCE removal
efficiencies for the air strippers have ranged from 96 percent to greater than 99 percent since start up in 1995
Air emissions have been below allowable limits for both treatment systems since since start up in 1995
86
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Groundwater Extraction and Treatment at the Logistics Center Operable Unit,
Fort Lewis, Washington
Costs:
The total cost incurred for design, construction and the first year of O&M for the two extraction and treatment systems
was $5,208,000. The design cost was $1,251,000, and the construction cost was $3,528,000
Description:
The Logistics Center site at Fort Lewis covers 650 acres and is currently an active facility. The site was previously
operated as an ordnance depot from 1942 to 1963 and has been operated as a non-aircraft maintenance facility since 1963.
Groundwater at the Logistics Center has been contaminated with chlorinated organic compounds as the likely result of
past disposal activities that included disposal of waste solvents in trenches excavated at the site. The principle
contaminants of concern at the site are TCE and DCE. In 1990, a ROD was signed for the Logistics Center Operable Unit
specifying that the contaminant plume be monitored and reduced over time, and that migration of groundwater
contamination from the site be minimized.
In response to the ROD, it was determined that two extraction and treatment systems would be installed at the site. One
system (the East Gate system) was designed to reduce the contaminant plume in the source area, and the other system (1-5)
was designed to minimize off-site migration of contaminants. Both systems include treatment of contaminated
groundwater using air stripping, followed by recharge of treated water to the subsurface. Recharge is accomplished using
infiltration galleries located at each site and also by injection wells located at the East Gate site. The treatment systems
have been in operation since 1995, and it is anticipated that treatment will continue for 30 years. The treatment systems
each consistently meet federal and local requirements for treatment of groundwater prior to recharge and for allowable air
emissions.
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IN SITU GROUNDWATER TREATMENT ABSTRACTS
89
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In Situ Bio remediation Using Molasses Injection at an Abandoned Manufacturing
Facility, Emeryville, California
Site Name:
Abandoned Manufacturing Facility
Period of Operation:
Pilot study - August 1995 to February 1996
Full scale system - ongoing, data available from April 1997 to October 1998
Purpose/Significance of Application:
Bioremediation of a site contaminated with both chlorinated solvents and
hexavalent chromium
Contaminants:
TCE, hexavalent chromium
Concentrations of TCE reported as high as 12,000 ug/L
Contacts:
Remediation Contractor:
Daniel L. Jacobs
ARCADIS Geraghty & Miller, Inc.
3000 Cabot Boulevard West, Suite
3004
Langhorne, PA 19047
Telephone: (215) 752-6840
Fax: (215) 752-6879
e-mail: Djacobs@gmgw.com
Location:
Emeryville, California
Cleanup Authority:
State voluntary cleanup program
Cleanup Type:
Pilot and Full scale
Waste Source:
Electroplating operations
Technology:
In situ bioremediation
A pilot study was performed using a mixture of molasses, biologically
inoculated solution (supernatant), and tap water was injected into the
subsurface
The full-scale system used 91 temporary injection points, installed to 24 ft
bgs with a Geoprobe
Molasses injection events were performed in April 1997 and February 1998,
which involved a mixture of water, molasses, and a small amount of
supernatant
During the first injection event, each injection point received 25 gallons of
molasses, 1 gallon of supernatant, and 125 gallons of water
Type/Quantity of Media Treated:
Groundwater
Site geology consists of interbedded sand and clay units
Depth to groundwater is approximately 3.5 to 8 ft
Groundwater velocity is estimated at approximately 60 ft per yr
Regulatory Requirements/Cleanup Goals:
The pilot study was performed to determine if TCE degradation and metal precipitation could be enhanced by an in situ
reactive zone
Cleanup goals for the full-scale application were not identified
Results:
The average TCE concentration in on-site wells has decreased by 99% (3,040 \igfL in April 1995 to 4 ug/L in October
1998) during bioremediation
The trends for TCE degradation products (cis-l,2-DCE and VC) indicate that TCE has been reductively dechlorinated
to ethene under the engineered anaerobic conditions; initial cis-l,2-DCE and VC concentrations increased following
the first reagent injection, but declined as shown in the October 1998 groundwater monitoring results
The average concentrations of total chromium and hexavalent chromium in the injection area have been reduced by
approximately 98% and 99%, respectively
Costs:
The overall project cost was approximately $400,000
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In Situ Bio remediation Using Molasses Injection at an Abandoned Manufacturing
Facility, Emeryville, California
Description:
Metal plating operations were conducted at a manufacturing facility located in Emeryville, California (actual site name
confidential) from 1952 until 1989. Investigations conducted at the site found groundwater to be contaminated with
chlorinated solvents, primarily TCE, and hexavalent chromium. From August 1995 to February 1996, the site owner
conducted a pilot study of anaerobic reductive dechlorination to evaluate its potential as a groundwater remedy under a
state voluntary cleanup program. Based on the results of the pilot test, a full-scale system was installed and is operating at
the site.
The injection of molasses reagent solution created conditions favorable for the reduction in TCE, DCE, VC, and
chromium concentrations in the subsurface. During an 18-month period of full-scale operation, average concentrations of
TCE were reduced by 99%, from more than 3,000 ug/L to 4 ug/L, and average concentrations of Cr+6 also were reduced
by 99%. The pilot study showed that the rate of reductive dechlorination could be enhanced with the use of an injected
molasses solution.
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In Situ Bio remediation Using Molasses Injection at the Avco Ly coming
Superfund Site, Williamsport, Pennsylvania
Site Name:
Avco Lycoming Superfund Site
Location:
Williamsport, Pennsylvania
Period of Operation:
Pilot study October 1995 to March 1996;
Full-scale system ongoing, data available through July 1998
Cleanup Authority:
CERCLA
ROD signed December 1996
Purpose/Significance of Application:
One of the first applications of molasses injection technology on a full scale at a
Superfund site
Cleanup Type:
Pilot and Full scale
Contaminants:
Chlorinated solvents and heavy metals - TCE, DCE, VC, hexavalent chromium,
cadmium
Maximum concentrations measured in late 1996 were TCE - 700 ug/L,
hexavalent chromium - 3,000 ug/L, and cadmium - 800 ug/L
Waste Source:
Spills and leaks from plating
operations; disposal in lagoons and
wells
Contacts:
Remediation Contractor:
Daniel L. Jacobs
ARCADIS Geraghty & Miller, Inc.
3000 Cabot Boulevard, West, Suite
3004
Langhorne, PA 19047
Telephone: (215) 752-6840
Fax: (215) 752-6879
E-mail: djacobs@gmgw.com
EPA Remedial Project Manager:
Eugene Dennis
U.S. EPA Region 3
1650 Arch Street (3HS21)
Philadelphia, PA 19103-2029
(215)814-3202
E-mail: dennis.eugene@epa.gov
Technology:
In Situ Bioremediation; Anaerobic Reductive Dechlorination
Pilot studies consisted of molasses injection and air sparging/soil vapor
extraction
Full scale molasses injection system consists of 20 four-inch diameter
injection wells, ranging in depth from 19 to 30 ft, completed in the
overburden
Molasses is added two times each day at variable concentrations and rates
Eight additional wells are used for monitoring system performance
This is a proprietary technology owned by ARCADIS Geraghty & Miller.
Type/Quantity of Media Treated:
Groundwater
Site geology consists of a sandy silt overburden overlying a fractured bedrock
and a fractured limestone
Target area for treatment is the shallow overburden to approximately 25 ft
bgs, covering approximately 2 acres
Regulatory Requirements/Cleanup Goals:
The 1996 ROD specified the following cleanup goals for groundwater: TCE - 5 ug/L; 1,2-DCE - 70 ug/L; VC - 2 ug/L;
Cd - 3 ug/L; Cr+6 - 32 ug/L; Mn - 50 ug/L
Results:
The pilot study showed that the technology was able to create strongly reducing conditions
The baseline sampling event showed that anaerobic, reducing conditions were present only near two of the site
monitoring wells
Since the injection of reagent, the redox levels have decreased to anaerobic conditions in many of the wells that had
previously indicated an aerobic environment, and cleanup goals have been met in some of the wells
Analytical results for TCE, DCE, and VC for an area that was converted from aerobic to anaerobic show that TCE was
reduced from 67 to 6.7 ug/L, a 90% reduction. The concentration of DCE initially increased, indicating the successful
dechlorination of TCE, and then decreased to 19 ug/L
Concentrations of TCE, DCE, and Cr+6 have been reduced to less than their cleanup goals in many of the monitoring
wells at the site
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In Situ Bio remediation Using Molasses Injection at the Avco Ly coming
Superfund Site, Williamsport, Pennsylvania
Costs:
ARCADIS Geraghty & Miller reported a total project value of $145,000 for the pilot study application at this site,
including preparation of a work plan
The costs for the construction of the full scale molasses injection system was approximately $220,000. Operation and
maintenance, including monitoring, is approximately $50,000 per year
Description:
The Avco Lycoming Superfund site (Lycoming) is a 28-acre facility located in Williamsport, Pennsylvania. Since 1929,
various manufacturing companies have operated at the site. Past waste handling practices have contaminated the site,
including disposal of waste in wells and lagoons, and spillage and dumping of wastes from metal plating operations. In
1984, the state identified volatile organic compound (VOC) contamination in the local municipal water authority well
field located 3,000 ft south of the site. A pump and treat system was installed in the mid 1980's. In May 1995, the PRP
proposed the use of in situ bioremediation to replace the pump and treat remedy. Pilot studies of molasses injection and
air sparging/soil vapor extraction (SVE) were conducted from October 1995 to June 1996. A new ROD, issued in
December 1996, replaced the pump and treat remedy with in situ bioremediation, and a full-scale system has been
operating at the site since January 1997. Construction of the air sparging/SVE system was suspended in the Spring of
1998, due to higher than anticipated water levels.
The use of molasses injection was shown to create an anaerobic reactive zone in an 18-month period where concentrations
of TCE, DCE, and hexavalent chromium were reduced. According to the PRP contractor, this technology was shown to
save substantial resources when compared to pump and treat.
93
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In Situ Bioremediation Using Bioaugmentation at
Area 6 of the Dover Air Force Base, Dover Delaware
Site Name:
Dover Air Force Base, Area 6
Location:
Dover, Delaware
Period of Operation:
Proof of Technology Test: September 1996 to March 1998
Testing for Technology Scale-up: April 1998 to June 1999 (planned)
Full-scale System: Summer 1999 (planned)
Cleanup Authority:
CERCLA
Purpose/Significance of Application:
The first successful bioaugmentation project using live bacteria from another
site to treat TCE using reductive dechlorination
Cleanup Type:
Field demonstration (pilot proof of
technology test)
Contaminants:
Chlorinated solvents
Concentrations in the pilot area before the test were PCE - 46 ug/L, TCE -
7,500 ug/L, cis-DCE - 2,000 ug/L, and vinyl chloride - 34 ug/L
Waste Source:
Waste disposal
Contacts:
RTDF Contact:
Dr. David Ellis
DuPont Engineering
Barley Mill Plaza 27-2234
P.O. Box 80027
Wilmington, DE 19880-0027
(302) 892-7445
email: david.e.ellis@usa.dupont.com
ITRC Contact:
Paul Hadley
ITRC In Situ Bioremediation
Technical Task Team Leader
California Environmental Protection
Agency
Department of Toxic Substances
Control
PO Box 806
Sacramento, CA 95814
(916) 324-3823
EPA Remedial Project Manager:
R. Drew Lausch
U.S. EPA Region 3
1650 Arch Street
Philadelphia, PA 191103
(215) 814-3359
email: lausch.robert@epa.gov
Technology:
In Situ Bioremediation
Groundwater flow and three-dimensional transport models (MODFLOW and
MT3D) were used in designing the pilot system
The pilot system included three extraction or pumping wells and three
injection wells, each screened to a depth of 38 to 48 ft bgs, and designed to
operate as an isolated or "closed-loop" recirculation cell
The pumping wells were operated at a combined rate of 3.75 gpm (1.25 gpm
each), providing a residence time of about 60 days for groundwater from the
deep zone of the aquifer
The extracted groundwater was filtered, and substrate (sodium lactate) and
nutrients (ammonia and phosphate) were injected into the combined
groundwater stream downstream of the filter
On June 5 and 20, 1997, an aqueous culture (from the DOE's Pinellas site in
Largo, Florida; augmenting solution) was injected into the cell
Type/Quantity of Media Treated:
Groundwater
The saturated portion of the formation consists of various sands and is about
3 8 feet thick
The aquifer acts as one unconfined unit that includes three zones
(approximately equal thickness) - an upper zone of fine sand (0 to 12 ft bgs),
an intermediate zone of medium sand (12 to 25 ft bgs), and a deep zone also
of medium sand (25 to 48 ft bgs)
Groundwater is found in the intermediate and deep zones, starting at 10 to 12
ft bgs.
Hydraulic conductivity was 60 ft/day and groundwater velocity 140 ft/yr
Regulatory Requirements/Cleanup Goals:
Pilot test goals: 1) demonstrate that TCE and PCE degradation can be stimulated in the deep portion of an aquifer; 2)
confirm that degradation will proceed to nontoxic end products; 3) develop operation and cost data for a full-scale system;
and 4) document the methodology used in the pilot system
94
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In Situ Bioremediation Using Bioaugmentation at
Area 6 of the Dover Air Force Base, Dover Delaware
Results:
During the first five months of operation, the concentration of TCE gradually decreased, cis-DCE showed a slight
increase, and there was no increase for vinyl chloride or ethene, indicating that limited dechlorination was occurring
For the first 90-days following bioaugmentation, TCE concentrations continued to decrease and DCE concentrations
continued to increase; however, there was no evidence of vinyl chloride or ethene in the groundwater
By March 1998, all TCE and DCE in the groundwater were converted to ethene and between 75 and 80% of the TCE
and DCE had been recovered as ethene, indicating that the bioaugmentation was successful in destroying TCE by
reductive dechlorination
From April 1998 through June 1999, the test was focusing on testing of parameters involved with technology scale up
Costs:
Total capital costs were $285,563
Total operating costs were $164,962 for the first three months of operation (through November 30, 1996) and $522,620
for the first fifteen months of operation (through November 30, 1997)
According to the RTDF contact, a typical full-scale bioaugmentation system would cost substantially less than the
system used in the pilot test at Dover
Description:
Dover Air Force Base (AFB), located in Dover, Delaware, is a 4,000 acre military installation that began operating in
1941. An estimated 23,000 cubic feet of waste, including solvents, waste fuels and oils, and a variety of other wastes,
were disposed at the site from 1951 to 1970. Soil and groundwater at the base were found to be contaminated with
volatile organic compounds, including TCE and PCE, and with heavy metals, including arsenic and cadmium. In March
1989, the site was listed on the National Priorities List. During a remedial investigation, "Area 6" was one of the areas at
the base that was determined to have been contaminated with chlorinated solvents; a plume of VOCs was identified in
groundwater in this area. Based on the results of that investigation as well as additional sampling, the area was selected
for pilot testing of a bioaugmentation process. The remediation of Dover AFB is managed by EPA Region 3 and the
Delaware Department of Natural Resources and Environmental Control. Interim RODs were signed in September 1995
that identify the following technologies for remediation at Dover: anaerobic reductive dehalogenation, cometabolic
bioventing, and monitored natural attenuation. The pilot test was performed as part of the Bioremediation Consortium of
the Remediation Technology Development Forum.
Data from the pilot test indicated that an extended period of time was required for the bacteria to exhibit functional
dechlorination. At the start of bioaugmentation, lag periods of about 180 days between bioaugmentation and complete
reduction of TCE and DCE to ethene were observed, including a 90-day lag period before vinyl chloride was first
observed. Injection well plugging was a problem during the pilot test. Several methods were used to keep the wells
unplugged including cleaning the well screens with wire brushes and pumping out residue from the screened interval,
using hydrogen peroxide to clean the wells, and changing substrates from sodium lactate to lactic acid. Hydrogen
peroxide proved the most effective technique for keeping the wells from clogging.
95
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Aerobic Degradation at Site 19,
Edwards Air Force Base, California
Site Name:
Edwards Air Force Base
Location:
California
Period of Operation:
February 5, 1996 to April 1, 1997
Cleanup Authority:
CERLCA
Purpose/Significance of Application:
Field demonstration of in situ bioremediation using groundwater recirculation
wells to remediate TCE in a two aquifer system
Cleanup Type:
Field demonstration
Contaminants:
Chlorinated Solvents
Primary contaminant in groundwater- trichloroethene (TCE)
Levels as high as 1,150 ug/L found in the groundwater; average TCE
concentration in the upper and lower aquifer of 680 and 750 ug/L, respectively
No 1,1-DCE found at the site prior to the demonstration
Waste Source:
Equipment cleaning and solvent
degreasing operations
Contacts:
EPA RPM:
Richard Russell
U.S. EPA Region 9
75 Hawthorne Street, SFD-8-1
San Francisco, CA 94105
(415)744-2406
e-mail: russell.richard@epa.gov
Air Force Project Manager:
David Steckel
AFFTC/EMR
5 East Popson Avenue, Building
2650A
Edwards Air Force Base, CA 93524-
1130
(805) 277-1474
fax:(805)277-6145
e-mail: david.steckel@edwards.af.mil
Principal Investigator:
Dr. Perry McCarty
Stanford University
Department of Civil and
Environmental Engineering
Stanford, CA 94305-4020
(650)723-4131
fax: (650) 725-9474
e-mail: mccarty@ce.stanford.edu
Technology:
In Situ Bioremediation; Aerobic Degradation
Two 8-in diameter, PVC treatment wells installed approximately 24 m deep
and spaced 10m apart; equipped with submersible pumps
Each treatment well screened in both the upper (15m) and lower aquifers (10
m)
Groundwater recirculation - one well withdrew water from the upper aquifer
and discharged it into the lower aquifer, while the other well withdrew water
from the lower aquifer and discharged it into the upper aquifer creating a
bioreactive treatment cell
Initial flow rate - 38 liters per minute (L/min)
Operation included groundwater pumping, pulsed addition of toluene, and
addition of dissolved oxygen (DO, as gaseous oxygen) and hydrogen
peroxide (H2O2)
An area of 480 m2 (0.12 acres) was monitored using 20 monitoring wells
The demonstration included five phases, during which time the operating
parameters were varied: pre-operational studies (days 0 - 33); establishment
of a toluene-degrading consortium (days 34 - 55); pre-steady-state operation
(days 56 -136); steady-state operation (days 145 - 271); and balanced flow
operation (days 317 - 444)
Type/Quantity of Media Treated:
Groundwater
Volume of water in test area -1,160 m3
Volume of water pumped -12,132 m3 from upper to lower aquifer; 16,063 m3
from lower to upper aquifer
Groundwater contaminant plume of approximately 53 acres
Two relatively homogeneous aquifers - upper, unconfined aquifer is 8 m
thick, and separated by a 2 m aquitard from the lower confined aquifer;
lower, confined aquifer is approximately 5 m thick and lies above weathered
bedrock
Regulatory Requirements/Cleanup Goals:
The objectives of the field demonstration included evaluate the effectiveness of in situ bioremediation to treat TCE in
groundwater and to collect data for potential full-scale application at the site
Specific remedial goals were not established for the demonstration
96
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Aerobic Degradation at Site 19,
Edwards Air Force Base, California
Results:
The system was found to be technically feasible for remediation of TCE in a two aquifer system
TCE concentrations were reduced by 97.7%, from levels of up to 1,150 ug/L to 27 ug/L
The average reduction of TCE during steady-state operation (days 145 - 271) was 87% in the upper aquifer bioactive
zone and 69% in the lower aquifer adjacent to treatment well Tl discharge screen
The average reduction of TCE during balanced flow operation (days 365 - 444) was 86% and 83% in the upper and
lower aquifer bioactive zones, respectively
No information was provided about potential degradation products from this demonstration
Costs:
The total cost for the demonstration at Edwards AFB was $337,807, including $323,453 in capital costs and $14,354 in
O&M costs
Description:
Edwards Air Force Base covers approximately 301,000 acres, is located on the western portion of the Mojave Desert,
about 60 miles north of Los Angeles, and is used for aircraft research and development. From 1958 through 1967, rocket
engines were maintained in facilities at the site. Spent TCE from maintenance operations was disposed at Site 19, a 53
acre area on the west side of Rogers Dry Lake. The resulting groundwater contaminant plume extends approximately
3,200 ft down-gradient from the source area. The site was added to the National Priorities List in August 1990. A Record
of Decision (ROD) had not been signed for this facility at the time of this report.
Site 19 at Edwards Air Force Base was selected for a field demonstration to evaluate in situ bioremediation for the
treatment of groundwater contaminated with TCE. The system used for the demonstration consisted of two treatment
wells screened in both the upper and lower aquifers. One treatment well was used to withdraw water from the upper
aquifer and discharged it into the lower aquifer, while the other treatment well was used to withdraw water from the lower
aquifer and discharge it into the upper aquifer. This process recirculated the water between the two aquifers creating a
bioreactive treatment cell. Treatment system operation included the pulsed addition of toluene, and the addition of
dissolved oxygen and hydrogen peroxide (H2O2). The demonstration included steady-state and balanced flow operation.
The results of the field demonstration showed that in situ bioremediation using groundwater recirculation was technically
feasible for remediating TCE in a two aquifer system. TCE concentrations were reduced by 97.7%. The average
reduction of TCE during steady-state operation was 69% to 87% in the lower and upper aquifer bioactive zones,
respectively. The average reduction of TCE during balanced flow operation was 83% and 86% in the lower and upper
aquifer bioactive zones, respectively. Prevention of well clogging was found to be an important operational concern for
application of this technology. In this demonstration, site operators used well redevelopment and addition of hydrogen
peroxide to control clogging.
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In Situ Bioremediation at the Hanford 200 West Area Site, Richland, Washington
Site Name:
Hanford 200 West Area
Location:
Richland, Washington
Period of Operation:
January 1995 to March 1996
Cleanup Authority:
Not identified
Purpose/Significance of Application:
In situ bioremediation of chlorinated solvents and nitrate, including use of a
computer-based tool to aid in system design and operating strategies
Cleanup Type:
Field demonstration
Contaminants:
Chlorinated solvents
Concentrations in groundwater at the demonstration site were approximately
2 mg/L for carbon tetrachloride (CC14) and about 250 mg/L for nitrate
Estimated 600,000 kg of CC14 in soil and groundwater at demonstration site
Waste Source:
Chemical processing operations
Contacts:
Technical Contact:
Rod Skeen
Principal Investigator
Pacific Northwest National
Laboratory
(509) 375-2265
Management Contact:
Jim Wright
DOE EM-50
Subsurface Contaminants Focus Area
Manager
(803) 725-5608
Licensing Information:
John Sealock
Technology Transfer
PNNL
(509) 375-3635
Technology:
In Situ Bioremediation
One injection/extraction well pair (dual multi-screened wells) used to
recirculate groundwater; two monitoring wells located between recirculation
wells; a nutrient injection system; and a groundwater sampling system
Groundwater was extracted and filtered, nutrients were added, and reinjected
Nutrients consisted of acetate and nitrate pulses added at 24 hr intervals; the
nitrate pulses were skewed 10 hrs from the acetate pulses
An Accelerated Bioremediation Design Tool (ABDT) was used to determine
pulse requirements
Two separate tests were performed - one in the upper aquifer zone and one in
the lower aquifer zone
Type/Quantity of Media Treated:
Groundwater
The unsaturated zone is 75 m thick and uncontaminated
Upper aquifer zone occurs at 75 - 78 m bgs; lower aquifer zone occurs at 87 -
92 m bgs; zones separated by low permeability unit and do not interact with
each other significantly
Regulatory Requirements/Cleanup Goals:
Purpose of the demonstration was to evaluate the ability of the technology to degrade chlorinated solvents and to collect
information about the use of ABDT
Results:
Approximately 2 kg of CC14 were biodegraded during the upper and lower zone tests, with less than 2% conversion to
chloroform
CC14 biodegradation rate - 0.8 mg/g-biomass/day in upper zone and 0.9 mg/g/day in lower zone
The concentration of CC14 in the upper zone was reduced from approximately 2.0 to 1.2 mg/L after 100 days
The upper zone test produced more than 20 kg of bacteria and the lower zone more than 10 kg (dry weight)
No plugging of the injection well was observed
The ABDT was used to design and operate an effective in situ bioremediation system for the demonstration
98
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In Situ Bioremediation at the Hanford 200 West Area Site, Richland, Washington
Costs:
An analysis of projected costs showed that the costs for in situ bioremediation were $5.80/m3, compared to $13.30/m3
for the baseline technology of air sparging/GAC; the treatment time was estimated as 1.9 yrs for ISB and 4.5 yrs for
AS/GAC
In situ bioremediation is cost-effective where plumes or portions of plumes are small enough for volumetric treatment
(100 m diameter range), in aquifers where contaminant plumes exhibit non-equilibrium contaminant partitioning, and in
source area plumes with significant contaminant sorption
Description:
The Hanford Site's mission has been to support national defense efforts through the production of nuclear materials.
From 1944 to 1989, as part of the plutonium recovery processes, a variety of wastes including solvents, metals, and
radionuclides were released to the soil and groundwater. Soil and groundwater at the 200 West Site Area at Hanford,
located approximately 250 ft north of the sanitary tile field and 750 ft west of the 221-T plant, is contaminated with an
estimated 600,000 kg of CC14. The 200 West Site Area was selected for a field-scale demonstration of in situ
bioremediation. The demonstration included two separate tests, which were conducted in distinct, unconnected aquifer
zones at the test site.
A recirculating well in situ bioremediation system was demonstrated at the 200 West Site Area, which showed reductions
in the mass and concentration of CC14 in the two aquifer zones. Lessons learned from the field demonstration included
that effective ISB system design and operational process control requires an ABDT or similar process simulator, and that
use of an ABDT allows quick corrective action (such as changes in the amount/duration of nutrient pulse or the pulse
period) to maintain rapid contaminant destruction during these changes. In addition, ISB was found to yield significant
economic and efficiency gains over conventional baseline technologies for remediation of groundwater contaminated with
VOCs and nitrates, and to be potentially effective for treating plumes caused by dissolution of non-aqueous phase liquids.
99
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Aerobic Degradation at Moffett Naval Air Station, Mountain View, California
Site Name:
Moffett Naval Air Station
Location:
Mountain View, California
Period of Operation:
September 1986 to November 1988 (three seasons)
Cleanup Authority:
CERCLA
Purpose/Significance of Application:
One of the earliest field demonstrations of aerobic in situ bioremediation under
varying experimental conditions
Cleanup Type:
Field demonstration
Contaminants:
Chlorinated Solvents
1,1,1 -trichloroethane (TCA) and 1,1 -dichloroethane (DCA) found in test
zone; regulatory approval obtained for adding TCE, cis- and trans-DCE, and
VC to the injected groundwater for demonstration
Waste Source:
Leaks and spills from aircraft and
maintenance operations; disposal of
waste in landfills
Contacts:
EPA RPM:
Roberta Blank
U.S. EPA Region 9
75 Hawthorne Street, SFD-8-1
San Francisco, CA 94105
(415)744-2384
e-mail: blank.roberta@epa.gov
Principal Investigator:
Dr. Lewis Semprini
Oregon State University
Department of Civil, Construction,
and Environmental Engineering
202 Apperson Hall
Corvallis, OR 97331-2302
(541) 737-6895
fax: (541) 737-3099
e-mail: Lewis.Semprini@orst.edu
Technology:
In Situ Bioremediation; Aerobic Degradation
One extraction well and two injection wells used to create groundwater
recirculation treatment cell
TCE, cis- and trans-DCE, and VC injected into groundwater (regulatory
approval obtained)
Experiments conducted using native bacteria, methane addition, phenol and
toluene addition, and hyfrogen peroxide addition; bromide tracer tests also
performed
Type/Quantity of Media Treated:
Groundwater
Test zone located in shallow, confined aquifer -1.5 m thick; approximately 4
to 6 m bgs
Hydraulic conductivity -0.11 cm/sec; indigenous methanotrophic bacteria
present in aquifer
Regulatory Requirements/Cleanup Goals:
The objectives of the field demonstration included evaluating the performance of in situ biodegradation of chlorinated
aliphatic hydrocarbons (CAHs) using native bacteria enhanced through addition of methane, toluene, and phenol
Specific remedial goals were not established for this demonstration
Results:
Methane addition was required for biodegradation of CAHs
Removal rates for methane addition - TCE (20 - 30%), cis-DCE (45 - 55%), trans-DCE (80 - 90%), and VC (90- 95%);
rate of TCE reduction remained relatively constant over three seasons of testing
Use of phenol and toluene achieved higher percent removals of TCE (93 - 94%)
Presence of 1,1-DCE was toxic to the transforming bacteria
Costs:
Not provided
100
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Aerobic Degradation at Moffett Naval Air Station, Mountain View, California
Description:
Moffett Naval Air Station, used for aircraft operations and maintenance, operated from 1933 to 1994, and is located 35
miles south of San Francisco in Santa Clara County. In 1994, the Navy ceased operations and the airfield was transferred
to the National Aeronautics and Space Administration. Soil and groundwater at the site are contaminated with petroleum
products and VOCs, including TCE and PCE. Moffett was selected for a field demonstration of aerobic biodegradation
and a series of experiments were conducted to evaluate the performance of the technology in treating CAHs using native
bacteria enhanced through addition of methane, toluene, and phenol.
Results showed that active use of methane in the treatment zone was required for biodegradation of CAHs, and that
groundwater residence times in the treatment zone of 1-2 days resulted in biodegradation of TCE, DCE, and VC. The use
of phenol and toluene achieved higher percent removals of TCE (93 - 94%) compared with use of methane (19%), and
hydrogen peroxide was found to achieve TCE removals similar to those achieved using oxygen. While 1,1-DCE was
partially transformed in the study with phenol, the transformation products were toxic to the transforming bacteria.
Therefore, the use of this technology when 1,1-DCE is present may not be appropriate. Alternating pulsed addition of
methane and oxygen helped to prevent biofouling in the area near the injection well. According to the researchers, the
relatively low concentration of phosphate in the groundwater did not limit the biodegradation of CAHs at this site; other
phosphate minerals may have dissolved in the groundwater to replenish this mineral as it was being removed by the
bacteria. The results from the field experiments were found to be consistent with the results from batch soil column
laboratory testing using aquifer solids from the test zones.
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Enhanced In Situ Anaerobic Bio remediation of Fuel-Contaminated Ground Water
Site Name:
Naval Weapons Station (NWS) Seal Beach
Location:
Southern CA
Period of Operation:
9/97 - 10/98
Cleanup Authority:
California Regional Water Quality
Control Board
Regulatory Authority:
Lawrence Vitale
CARWQCB Region 8
2010 Iowa Ave, Suite 100
Riverside, CA 92507-2409
(909) 782-4130
Purpose/Significance of Application:
Demonstrate anaerobic bioremediation for treating fuel hydrocarbons
Cleanup Type:
Field demonstration
Contaminants:
Fuel hydrocarbons and BTEX
Maximum concentrations in groundwater: benzene - 4,000 ug/L;
ethylbenzene - 250 ug/L; m+p-xylenes - 500 ug/L
Waste Source:
Leaks from USTs
Contacts:
Project Management:
Carmen A. LeBron
Naval Facilities Engineering Service
Center
1100 23rd Ave, ESC 411
Port Hueneme, CA 93043
Telephone: (805) 982-1616
Fax: (805) 982-4304
E-mail: lebronca@nfesc.navy.mil
Principal Investigator:
Martin Reinhard
Dept. of Civil and Environ. Engr.
Stanford University
Stanford, CA 94305 ^4020
Telephone: (650) 723-0308
Fax:(650)725-3162
E-mail: reinhard(@cive.stanford.edu
Technology:
In Situ Bioremediation
Demonstration used one extraction and three injection wells (three zones of
180 m3 each)
Extraction rate 4.5 L/min; injection 1.5 L/min/well
Electron acceptors varied by zone - one zone augmented with sulfate, one
with sulfate and nitrate, one with none; three rounds of augmentations
performed
Sampling performed with automated system
Type/Quantity of Media Treated:
Groundwater (in situ), Soil (in situ), LNAPL
Contaminated area 20 acres, demonstration conducted on portion of site
Groundwater velocity 0.7 cm/sec; transmissivity >2 ftVday; depth to
groundwater low
Groundwater had been anaerobic for > 10 yrs
Regulatory Requirements/Cleanup Goals:
Demonstrate the technical viability of the technology to treat petroleum hydrocarbons and to stimulate biodegradation
of BTEX with nitrate and sulfate
No specific cleanup goals were identified
Results:
Concentrations of BTEX compounds were reduced, with toluene preferentially degraded
Ethylbenzene and m+p-xylene degradation stimulated by nitrate, with concentrations reduced from 250 to <10 ug/L for
ethylbenzene and from 500 to <20 ug/L for xylenes
O-xylene degradation stimulated by sulfate, with concentration reduced from >400 to <10 ug/L
Benzene removal was mostly due to flushing rather than biodegradation
Costs:
Demonstration costs were $875,000, including equipment, labor, laboratory supplies, travel, and overhead; >9,000
samples were collected
Projected present value costs for a full-scale bioremediation application were $ 1,085,000, or $4,340/gallon of fuel
recovered, compared with similar costs for pump and treat of $1,530,000, or $6,120/gallon of fuel recovered
102
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Enhanced In Situ Anaerobic Bio remediation of Fuel-Contaminated Ground Water
Description:
In 1984, a fuel leak was discovered at the Naval Weapons Station (NWS) Seal Beach when a steel tank was replaced with
fiberglass tanks. NWS Seal Beach is located in southern California between Long Beach and Huntington Beach. About
5,800 gallons of fuel had leaked and migrated to the groundwater and was a concern for its potential effects on a local
wildlife refuge.
A demonstration of in situ bioremediation was performed in a portion of the contaminated area of this site. The
demonstration evaluated the performance of various concentrations of sulfate and nitrate in three zones between one
extraction well and three injection wells. The results showed that concentrations of BTEX compounds were reduced,
with toluene preferentially degraded. Ethylbenzene and xylenes also were degraded, but benzene was found to be
removed mostly by flushing. Projected full-scale costs for in situ bioremediation were found to be approximately 30%
less than for pump and treat. Lessons learned included the effect of BTEX compounds in a non-aqueous phase, the
demand of non-BTEX fuel hydrocarbons on sulfate and nitrate, and the role of sulfate and nitrate as terminal electron
acceptors.
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In Situ Bioremediation (Anaerobic/Aerobic) at Watertown, Massachusetts
Site Name:
Not identified
Period of Operation:
Anaerobic: November 1996 to July 1997;
Aerobic: August 1997 to ongoing (data available through October 1997)
Purpose/Significance of Application:
Combined anaerobic/aerobic system for treatment of chlorinated solvents
Contaminants:
Chlorinated Solvents
TCE, PCE; initial TCE levels were 12 mg/L
Contacts:
Technology Researcher:
Dr. Willard Murray
Harding Lawson Associates
107 AudubonRoad Suite 25
Wakefield,MA01880
(781)245-6606
E-mail: wmurray@harding.com
EPA Contact:
Dr. Ronald Lewis
U.S. Environmental Protection
Agency
26 W. Martin Luther King Dr.
Cincinnati, OH 45268
(573) 569-7856
lewis.ronald@epa.gov
Location:
Watertown, Massachusetts
Cleanup Authority:
Not identified
Cleanup Type:
Field demonstration
Waste Source:
Manufacturing operations
Technology:
In situ bioremediation
A "two-zone" enhanced bioremediation process that used sequential
anaerobic and aerobic biodegradation processes to degrade PCE and TCE;
anaerobic conditions were used for eight months (through late July 1997),
then changed to aerobic conditions
The system was a groundwater recirculating cell that consisted of three
injection wells and three extraction wells, and covered a surface area of
approximately 10 ft by 20 ft; with wells screened from 13 to 20 ft bgs
Nutrients and a carbon source were injected into the groundwater through the
three up-gradient wells and extracted through the three down-gradient wells
A relatively constant recirculating flow rate of 0.25 gpm was used along with
an amendment injection rate of about four gallons per day (approximately 1%
of the recirculating flow)
Lactic acid was used in the anaerobic conditions, and ORC socks plus
methane in aerobic conditions
Type/Quantity of Media Treated:
Groundwater
Soil at the Watertown site consists of about 13 ft of sand and gravel over
approximately 7 ft of silty sand
Depth to groundwater is approximately 8 ft bgs
Regulatory Requirements/Cleanup Goals:
Purpose of the demonstration was to evaluate the use of a combined anaerobic and aerobic system for treatment of
chlorinated solvent
Results:
After four to five months of operation of anaerobic operation, significant increases in DCE were observed along with
decreases in TCE concentrations, indicating that reductive dechlorination was occurring; no significant increases in VC
concentrations were observed until July 1997, 8 months after operations began
By July 1997, TCE concentrations had been reduced from about 12 mg/L at the beginning of the demonstration to less
than 1 mg/L and there was an overall reduction of about 80% in the mass of total VOCs
During the aerobic phase, levels of DCE and vinyl chloride have started to decrease in the groundwater; in addition,
DCE epoxide, a transient biodegradation product of aerobic degradation of DCE, was detected, indicating that aerobic
VOC-degrading bacteria have been stimulated
Costs:
The field-scale pilot study has incurred a cost of approximately $150,000 through November 5, 1997
No estimates were provided about the projected costs for a full-scale system using this technology
104
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In Situ Bioremediation (Anaerobic/Aerobic) at Watertown, Massachusetts
Description:
The Watertown site has been used since the late 1800's for a variety of operations, including a coal gas manufacturing
plant, which ceased operations in the 1930's, and a metal plating shop, which ceased operations in 1990. The site is
currently being used as a manufacturing facility for electric switch assembly. Soil and groundwater at the site are
contaminated with chlorinated solvents, including TCE and PCE, from past operations and waste disposal practices. A
field demonstration of the Two-Zone Plume-Interception Treatment Technology, developed by Harding Lawson
Associates (HLA, formerly ABB Environmental Services, Inc.), was conducted at the Watertown site under the Superfund
Innovative Technology Evaluation (SITE) program. The field demonstration is currently ongoing.
Under anaerobic conditions, TCE in groundwater was reduced by reductive dechlorination (from 12 mg/L to less than 1
mg/L) and there was an overall reduction of about 80% of the total VOC mass in one well. Data indicate that
methanogenic conditions were not achieved during the anaerobic phase and most of the reductive dechlorination was
attributed to sulfate-reducing bacteria. A period of about one month was required to establish aerobic conditions after
ORC socks were placed in the wells. This lag time was attributed to the presence of residual carbon that had to be
degraded before aerobic conditions could be established. Initial results indicate that VOC levels, primarily DCE and vinyl
chloride, are decreasing. According to EPA, future applications should consider not starting in the winter, start when the
anaerobic process can go quickly, use a higher level of lactate, and drive the oxidation potential down quickly.
105
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Methane Enhanced Bioremediation Using Horizontal Wells
at the Savannah River Site, Aiken, South Carolina
Site Name:
U.S. DOE Savannah River Site
Location:
Aiken, South Carolina
Period of Operation:
February 26, 1992 to April 30, 1993
Cleanup Authority:
CERCLA
Purpose/Significance of Application:
Field demonstration of in situ bioremediation system using horizontal wells and
methane injection
Cleanup Type:
Field demonstration
Contaminants:
Chlorinated Solvents
TCE and PCE concentrations in groundwater ranged from 10 to 1,031 ug/L
and 3 to 124 ug/1, respectively
TCE and PCE concentrations in sediment ranged from 0.67 to 6.29 mg/kg
and 0.44 to 1.05 mg/kg, respectively
Waste Source:
Wastewater discharges from
aluminum forming and metal finishing
operations
Contacts:
Principal Investigators:
Dr. Terry C. Hazen
Lawrence Berkeley National
Laboratory
Center for Environmental
Biotechnology
MS70A-3317
One Cyclotron Road
Berkeley, CA
(510)486-6223
fax: (510)486-7152
tchazen@lbl.gov
Brian Looney
Westinghouse Savannah River
Company
PO Box 616
Aiken, SC 29802
(803) 725-64137(803) 725-3692
DOE Integrated Demonstration
Manager:
Kurt Gerdes
U.S. DOE
Office of Environmental Management
Science & Technology Development
Office of Technology Systems
Cloverleaf Room 113 5
Germantown, MD 20874
Telephone: (301) 903-7289
fax: (301)903-7457
Technology:
In Situ Bioremediation
Methane enhanced bioremediation
Two horizontal wells used for the demonstration:
- "lower" horizontal injection well - depth of 175 feet (below the water
table); screen length of 310 feet; "upper" horizontal extraction well -
depth of 80 feet (in the vadose zone); screen length of 205 feet
- Air and gas injection rate - 200 scfm; air and contaminant extraction rate -
240 scfm
Catalytic oxidizer used to treat the extracted vapors
Demonstration performed in six different operational modes:
- baseline tests of the vapor extraction and injection systems (with and
without air sparging)
- a series of nutrient additions (addition of 1% methane, 4% methane, pulsed
4% methane; and combination of nitrous oxide at 0.007% and triethyl
phosphate at 0.07% in air in combination with pulses of 4% methane)
- a helium tracer test
- an assessment of microbiological assays for monitoring performance
Type/Quantity of Media Treated:
Groundwater and sediment
VOC plume was estimated to cover about 1200 acres and to be about 150-ft
thick
Dense nonaqueous phase liquids (DNAPLs) have also been observed
Depth to groundwater -120 to 135 feet bgs
Groundwater velocity -15 to 100 feet/year
Regulatory Requirements/Cleanup Goals:
Cleanup goals for groundwater included TCE (5 ppb) and PCE (5 ppb)
Information was not provided about cleanup goals for sediment
106
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Methane Enhanced Bioremediation Using Horizontal Wells
at the Savannah River Site, Aiken, South Carolina
Results:
After 384 days of operation, the system removed about 17,000 Ibs of VOCs through a combination of vacuum
extraction and biodegradation - the vacuum component of the system removed 12,096 Ibs of VOCs and the biological
component degraded 4,838 Ibs of VOCs
After treatment, the total sediment inventory for both TCE and PCE decreased by 24%, with the concentrations of
VOCs in most sediment samples reported to be below the detection limits; concentrations of TCE and PCE in
groundwater were reported to be less than 5 ppb; soil gas concentrations reportedly decreased by more than 99%
The addition of methane stimulated the growth of methanotrophs - 1% methane addition increased the population of
methanotrophs by several orders of magnitude, to levels close to 100,000 MPN/ml; 4% methane addition initially
increased the population of methanotrophs, which then decreased as a result of nutrient depletion
The addition of nitrogen and phosphorous nutrients with pulsed methane stimulated microbial activity. This phase was
reported to optimize bioremediation and mineralization of TCE and PCE in groundwater and sediments
Helium tracer tests indicated that more than 50% of the injected methane was consumed by indigenous microbes before
it reached the extraction well; results were not provided from the microbiological assays
Costs:
Projected costs for full-scale application at this site were $452,407 for total capital costs (including equipment
amortized over 10 years, well installation, and mobilization) and $236,465 for operation and maintenance (including
monitoring, consumables, and demobilization)
Description:
The U.S. Department of Energy (DOE) Savannah River Site (SRS) is a 300 square mile facility located in Aiken, South
Carolina that has been used for the research and production of nuclear materials. Area M at the facility was used for
aluminum forming and metal finishing operations. Wastewaters from this area containing an estimated 3.5 million pounds
of solvents were discharged to an unlined settling basin, a process sewer line, and a nearby stream from the 1950's to the
1980's. High levels of chlorinated solvents, primarily TCE (up to 1,031 ug/L in groundwater and 6.29 mg/kg im
sediment) and PCE (up to 124 ug/L in groundwater and 1.05 mg/kg in sediment), were found at the site and DNAPLs
were observed. The VOC groundwater plume was estimated to cover about 1200 acres and to be about 150-ft thick.
From February 1992 to April 1993, DOE conducted a field demonstration of in situ methane enhanced bioremediation
using two horizontal wells - one located below the water table and used for injection and one located in the vadose zone
and used for extraction. A catalytic oxidizer was used to treat the extracted vapors. The demonstration was performed in
six different operational modes, varying the type and concentration of nutrients added and the use of pulsing. During the
demonstration, about 17,000 Ibs of VOCs were removed through a combination of vacuum extraction and biodegradation.
The addition of methane stimulated the growth of methanotrophs, with the addition of 1% methane increasing the
population of methanotrophs by several orders of magnitude. Results of a tracer test showed that more than 50% of the
injected methane was consumed by indigenous microbes before it reached the extraction well.
107
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In Situ Bioremediation at the Texas Gulf Coast Site, Houston, Texas
Site Name:
Texas Gulf Coast Site (actual site name confidential)
Period of Operation:
Ongoing (data available from June 1995 to December 1998)
Purpose/Significance of Application:
Groundwater recirculation system using trenches for extraction and injection
Contaminants:
TCE, cis-l,2-DCE, VC
TCE was present at approximately 50 mg/L
Contacts:
Site Contractor:
Susan Tighe Litherland, P. E
David W. Anderson, P.E., P.O.
Roy F. Weston, Inc.
5300 Bee Caves Road, Suite 1-100
Austin, TX 78746
(512)329-8399
fax:(512)329-8348
e-mail: litherls@mail.rfweston.com
e-mail: andersod@mail.rfweston.com
Site Contact:
Not identified
Location:
Houston, Texas
Cleanup Authority:
State of Texas Voluntary Cleanup
Program; administered by TNRCC
Cleanup Type:
Full scale
Waste Source:
Leaks and spills from manufacturing
operations
Technology:
In situ bioremediation
An extraction-injection recirculation system, completed in May 1995,
consists of an alternating series of four extraction (1,800 linear ft total) and
four injection (1,100 linear ft total) trenches set at a spacing of approximately
100ft
The extraction trenches were completed to a depth of at least one foot into the
bottom clay layer (20 - 22 ft bgs), and were sloped to a sump
System operation consists of groundwater circulation and addition of
methanol
As of January 1999, the recirculation rate averages 6 to 8 gpm, and a total of
12 million gallons have been recirculated through the system (approximately
2.5 pore volumes)
Type/Quantity of Media Treated:
Groundwater
The area of contaminated groundwater is approximately 600 ft by 700 ft in an
unconsolidated water-bearing zone which occurs at a depth of approximately
12 -20 ft bgs
Hydraulic conductivity is 1 x 10"4 to 4 x 10"4 cm/sec
Groundwater velocity is 4 - 18 ft/yr
Regulatory Requirements/Cleanup Goals:
The primary objectives of the clean up are to actively remediate the contaminated groundwater at this site to a point that
natural attenuation would prevent further migration of the plume, and to discontinue active treatment
No specific cleanup goals have been identified for groundwater at this site
Results:
Excluding results from the one potential "source" area, the average decrease in TCE concentrations is approximately
99% (from an average of 12 to 0. 12 mg/L) during a 3 l/i year period
TCE concentrations in portions of the plume have decreased to below the detection limit (0.005 mg/L).
Accounting for dilution, the site contractor reported that TCE concentrations were reduced by approximately 2% per
month during a period of nutrient-only addition, and approximately 10% per month during the period of methanol
addition
The ratio of cis-l,2-DCE to TCE increased from approximately 0.06: 1 to 0.30: 1 after addition of methanol, suggesting
more active dechlorination associated with higher concentrations of substrate.
Costs:
Capital costs for construction of the extraction/injection trenches and control building were approximately $600,000
Annual costs for operation, maintenance and monitoring are approximately $100,000
108
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In Situ Bioremediation at the Texas Gulf Coast Site, Houston, Texas
Description:
The Texas Gulf Coast site is an abandoned industrial manufacturing facility located near Houston, Texas that operated
between 1952 and 1985. Trichloroethene was used at the facility and was found in the groundwater starting in 1986. In
situ bioremediation is being used to clean up groundwater at the site under the State of Texas Voluntary Cleanup Program.
Methanol addition was found to increase the rate of biodegradation of TCE at this site, based on the reduction of TCE
concentration and increase in the ratio of cis-l,2-DCE to TCE. This site is planning to stop using active bioremediation
after four years of system operation (three years of methanol addition) to allow use of natural attenuation. According to
the site contractor, natural attenuation will be used to prevent future migration of the plume, and to achieve stable or
declining contaminant concentrations. Excessive biomass formation, leading to a reduced flow rate, was found to be a
concern for addition of methanol. Excess biomass was not noted during the period when nutrients alone were added;
however, a significant increase in biomass formation was noted after addition of methanol. To remedy this, the site
contractor modified their methanol addition to a batch system. The site contractor found that it was difficult to balance
the system hydraulics between the extraction and infiltration trenches, and that it required approximately one year of
operating time to achieve a balance. In addition, they found it difficult to interpret the treatment performance data
because of the non-homogeneous nature of the initial groundwater quality, and dilution due to recharge of rainwater and
clean water from beyond the planned treatment area.
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In Situ Redox Manipulation at U.S. DOE Hanford Site, 100-H and 100-D Areas
Site Name:
U.S. Department of Energy Hanford Site, 100-H and 100-D Areas
Location:
Richland, WA
Period of Operation:
September 1995 to September 1998
Cleanup Authority:
Not identified
Purpose/Significance of Application:
Demonstrate in situ redox manipulation for treatment of hexavalent chromium
Cleanup Type:
Field demonstration
Contaminants:
Chromium
Initial chromate concentrations 60 ug/L in 100-H area and 910 ug/L in 100-D
area
Waste Source:
Nuclear processing operations
Contacts:
Technical Contacts:
John Fruchter
Pacific Northwest National
Laboratory
(509) 376-3937
Wayne Martin
Pacific Northwest National
Laboratory
(509) 372-4881
Management Contacts:
James A. Wright
DOE SR, Field Manager
(803) 725-5608
Technology:
In Situ Redox Manipulation (ISRM)
The field demonstration used 20,500 gallons of buffered sodium dithionite
solution (Na2S2O4, also known as hydrosulfite) to react with natural iron in
the subsurface and form reduced iron (Fe2+); the reduced iron reacts with
chromate to form insoluble chromium oxides
Dithionite solution was injected through one 8-inch diameter
injection/extraction well, allowed to react for 18 hrs, and then withdrawn; this
created a reduced zone 50 ft in diameter
The withdrawal phase took 83 hrs and 4.8 injection volumes to remove
unreacted reagent, buffer, reaction products, bromide tracer, and mobilized
metals
16 two-inch monitoring wells were used to assess physical and chemical
conditions after the test
Type/Quantity of Media Treated:
Groundwater
Depth to groundwater is 50 ft in 100-H area and 85 ft in 100-D area
Aquifer is 15-20 ft thick
Regulatory Requirements/Cleanup Goals:
Evaluate performance of ISRM for treating chromium in groundwater
No specific cleanup goals were identified
Results:
Concentrations of chromium in groundwater were reduced to less than 8 ug/L in one month
87-90% of the dithionite solution was recovered during the withdrawal phase, along with most of the mobilized metals
(Fe, Mn, Zn)
Within 25 ft of the injection well, 60-100% of the available iron was reduced; this zone was estimated to have a life of
7-13 yrs
Two years after treatment was complete, the treatment zone remained anoxic and hexavalent chromium below detection
limits
Costs:
Projected costs for use of ISRM in a full-scale deployment at this site were identified using two methodologies (one for
a 200 ft barrier and one for a 1,400 ft barrier), both in comparison to projected costs for pump and treat; this analysis
showed cost savings for use of ISRM of $4.6 to 16 million
110
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In Situ Redox Manipulation at U.S. DOE Hanford Site, 100-H and 100-D Areas
Description:
The 100 Area of the Hanford site contains nine nuclear reactors, and is located in the north-central portion of the site near
the Columbia River. During reactor operations, chromium was introduced to the soil and groundwater in this area.
A demonstration of in situ redox manipulation (ISRM) was conducted in the 100-H and 100-D areas at Hanford that
consisted of field-scale demonstrations. ISRM is a passive barrier technique that uses injection of buffered sodium
dithionite solution (Na2S2O4) to react with natural iron in the subsurface and form reduced iron (Fe2+); the reduced iron
reacts with chromate to form insoluble chromium oxides. Results from the field demonstration test showed that initial
chromate concentrations of 60 ug/L in the 100-H area and 910 ug/L in the 100-D area were reduced to less than 8 ug/L in
a one month period. In addition, 87-90% of the dithionite solution was recovered during the withdrawal phase, along with
most of the mobilized metals (Fe, Mn, Zn). A full-scale deployment for the Hanford 100-HR-3 operable unit is planned
to begin in late 1999.
111
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In Situ Chemical Oxidation Using Potassium Permanganate at Portsmouth Gaseous
Diffusion Plant, X-701B Facility
Site Name:
Portsmouth Gaseous Diffusion Plant, X-701B Facility
Location:
Piketon, OH
Period of Operation:
Spring 1997 (operated for one month)
Cleanup Authority:
RCRA Corrective Action
Purpose/Significance of Application:
Demonstrate in situ chemical oxidation for treating chlorinated solvents
Cleanup Type:
Field demonstration
Contaminants:
Chlorinated solvents
Initial TCE concentrations in groundwater averaged 176.7 mg/L
Waste Source:
Leaks from USTs
Contacts:
Technical Contacts:
Robert L. Siegrist
Colorado School of Mines and Oak
Ridge Natl. Lab.
(303) 273-3490
Olivia West
Oak Ridge Natl. Lab.
(423) 576-5005
Management Contacts:
Tom Houk
Bechtel Jacobs Company, LLC
(740) 897-6502
James A. Wright
DOE SR, Field Manager
(803) 725-5608
Technology:
In Situ Chemical Oxidation
Demonstration used a pair of parallel horizontal wells - one to extract
groundwater (6 gpm) and one to reinject after addition of potassium
permanganate (KMnO4)
Each well had a 200 ft screened section located in a 5 ft thick silty, gravel
aquifer in the center of a plume
Crystalline KMnO4 was added to the extracted groundwater and reinjected
into the downgradient well 90 ft from the extraction well; a total of 206,000
gals of KMnO4 solution was injected
Oxidant solution (~2% KMnO4) was recirculated for one month
Delivery of oxidant solution was not uniform throughout the horizontal well;
a subsequent injection of KMnO4 was made into a nearby vertical well for 8
days to enhance delivery
System shutdowns were due to heavy rains, well-screen clogging, and repairs
Type/Quantity of Media Treated:
Groundwater (in situ)
The Gallia sand and gravel unit was the target for the demonstration
DNAPL compounds (mostly TCE) were located 25-35 ft bgs, 12 ft below top
of water table
Area of contamination approximately 90 ft by 220 ft by 6 ft (119,000 ft3)
containing 272.7 Ibs of TCE
Regulatory Requirements/Cleanup Goals:
Evaluate performance of the technology in degrading TCE
No specific cleanup goals were identified
Results:
Average concentrations of TCE were 176.7 mg/L before treatment, 110 mg/L at completion of treatment, and 41 mg/L
two weeks after recirculation ended; concentrations increased to 65 mg/L at 8 weeks and 103 mg/L at 12 weeks after
recirculation ended
Immediately after recirculation ended, concentrations of TCE were low (BDL to low ug/L) in monitoring wells where
KMnO4was also detected
Residual concentrations of KMnO4were detected at nine monitoring well locations 19 months after the demonstration
ended
112
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In Situ Chemical Oxidation Using Potassium Permanganate at Portsmouth Gaseous
Diffusion Plant, X-701B Facility
Costs:
The estimated cost for the demonstration was $562,000, consisting of project management ($67,440), pre-
demonstration characterization ($162,980), remediation operations/oxidant recirculation ($162,980), resistivity
monitoring ($67,440), and post-demonstration characterization and demobilization ($101,160)
Projected costs for use of the technology at a full-scale were $516,360, to treat a hot spot area of 22.9 acres in the
central portion of the X-701B plume; this corresponds to $64/yd3
Description:
The Portsmouth Gaseous Diffusion Plant (PORTS), located 80 miles south of Columbus, Ohio, is a 3,714-acre DOE
reservation. It was constructed between 1952 and 1956 and enriches uranium for electrical power generation. The X-
70 IB site, located in the northeastern area of PORTS, contains an unlined 200 ft by 50 ft holding pond. The pond was
used from 1954 to 1988 for neutralization and settling of metal-bearing acidic wastewater and solvent-contaminated
solutions. During a RCRA Facility Investigation, TCE was detected in a groundwater sample at 700 mg/L.
A field demonstration of in situ chemical oxidation was conducted at PORTS using a pair of parallel horizontal wells -
one for extraction and one for reinjection. Crystalline KMnO4 was added to extracted groundwater and reinjected into the
downgradient well 90 ft from the extraction well; a total of 206,000 gals of KMnO4 solution was injected and recirculated
for one month. Results showed that immediately after recirculation ended, concentrations of TCE were low (DDL to low
ug/L) at those locations where KMnO4 was detected in the monitoring well. However, oxidant addition was not uniform
and average concentrations were higher -110 mg/L at completion of treatment, and 41 mg/L two weeks after recirculation
ended. The researchers concluded that the number and pattern of extraction and injections wells must be designed to
ensure maximum coverage of the treatment zone.
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Phytoremediation Using Constructed Wetlands at the Milan Army Ammunition
Plant, Milan, Tennessee
Site Name:
Milan Army Ammunition Plant
Location:
Milan, Tennessee
Period of Operation:
June 17, 1996 to July 21, 1998
Cleanup Authority:
Not identified
Purpose/Significance of Application:
Use of constructed wetlands for treatment of explosives-contaminated
groundwater
Cleanup Type:
Field demonstration
Contaminants:
Explosives
Total nitrobody (the sum of the following six explosives: TNT, RDX, HMX,
TNB, 2A-DNT, and 4A-DNT) concentrations in groundwater ranged from
3,250 to 9,200 ppb
TNT concentrations in groundwater ranged from 1,250 to 4,440 ppb
RDX concentrations in groundwater ranged from 1,770 to 4,240 ppb
HMX concentrations in groundwater ranged from 87 to 110 ppb
Waste Source:
Industrial wastewater discharged to
ditches
Contacts:
AEC Project Manager:
Darlene F. Bader
U.S. Army Environmental Center
ATTN: SFIM-AEC-ETD (Bader)
5179HoadleyRoad
APG,MD 21010-5401
(410)436-6861
Fax: (410) 436-6836
E-mail: dfbader@aec.apgea.army.mil
TVA Program Manager:
Richard A. (Rick) Almond
Tennessee Valley Authority
Reservation Road CEB 4C
Muscle Shoals, AL 35661
(256) 386-3030
Fax: (256) 386-3799
E-mail: raalmond@tva.gov
Technology Research Biologist:
Dr. Susan L. Sprecher
Chemical Control Technology
U.S. Army Corps of Engineers
Waterways Experiment Station, ES-p
3 909 Halls Ferry Rd.
Vicksburg, MS 39180-6199
(601) 634-2435
Fax: (601) 634-2617
Technology:
Constructed Wetlands
Two types of wetlands were demonstrated - a gravel-based system and a
lagoon-based system
Both systems were designed to retain groundwater for approximately 10 days
at an influent flow rate of 5 gpm per system
The gravel system consisted of two 4 ft deep gravel-filled beds (cells)
connected in series and planted with emergent plants; the first cell (0.088
acre) was maintained as anaerobic (by carbon addition) and the second cell
(0.030 acre) as aerobic; emergent plants used were canary grass, wool grass,
sweetflag, and parrotfeather
The lagoon system consisted of two 2 ft deep lagoons (cells) connected in
series and planted with submergent plants
The demonstration was conducted in three phases - (I) plant screening and
treatability studies; (II) design, construction, and 16 months of monitoring;
and (III) longer-term monitoring and optimization
Type/Quantity of Media Treated:
Groundwater
Groundwater flow north-northwest
Regulatory Requirements/Cleanup Goals:
Reduce concentration of TNT to less than 2 ppb, and total nitrobody concentrations (see contaminants) to less than 50
ppb
114
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Phytoremediation Using Constructed Wetlands at the Milan Army Ammunition
Plant, Milan, Tennessee
Results:
The gravel-based system performed better than the lagoon-based system
The gravel system reduced TNT, RDX, and HMX concentrations to below the cleanup goals during all but the coldest
months; in addition, a sustainable ecosystem was established
The lagoon system met the cleanup goal for TNT of 2 ppb only during the first 50 days of the demonstration, but did
not remove RDX and HMX or meet the total nitrobody goals; in addition, an adequate plant population was not
maintained within the lagoon system
Costs:
Projected costs for a 10-acre, full-scale, gravel-based system designed to treat 200 gpm of contaminated groundwater at
Milan AAP were $3,466,000 ($1998).
Assuming a 95% system availability and 30-yr life, the total cost (capital plus O&M) for use of this system was
estimated as $1.78 per 1,000 gals of groundwater
Description:
The Milan Army Ammunition Plant (MAAP) is a government-owned, contractor-operated military industrial installation
within the U.S. Army Industrial Operations Command. The original facility was constructed during World War II.
MAAP is located on 22,436 acres of land, which include approximately 548 acres for various production lines, 7,930
acres for storage areas, and 1,395 acres for administrative, shop maintenance, housing, recreation, and other functions.
From World War II to 1981, MAAP's production facilities discharged explosives-contaminated wastewater directly into
open ditches that drained from sumps or surface impoundments into local streams. Several of these drainage ditches
became contaminated with explosive residuals which leached into the groundwater. In 1981, the production facility's
wastewaters were redirected to explosives-contaminated wastewater treatment plants.
A wetlands demonstration system was constructed in Area K adjacent to Building K-100. The demonstration consisted of
gravel- and lagoon-based systems, and was conducted over a two-year period. The study found that the gravel-based
system had results better than the lagoon system, and met the goals during all but the coldest months. The lagoon system
did not consistently meet the goals, and had several operational problems, including a severe tadpole infestation and a
hailstorm. The demonstration study authors concluded that a wetland's economic and technical feasibility depends on
site-specific factors such as regional temperature variations, rainfall patterns, groundwater flow characteristics, explosive
type and concentration, the presence of other contaminants, and regulatory requirements. In general, they found that
wetlands perform better in warmer climates with moderate levels of rainfall.
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Multi-Phase Extraction at the 328 Site, Santa Clara, CA
Site Name:
328 Site
Location:
Santa Clara, CA
Period of Operation:
November 19, 1996 to May 4, 1999
Shutdown period to assess rebound: June 5, 1998 through September 8, 1998
Cleanup Authority:
State of California San Francisco Bay
Regional Water Quality Control Board
Purpose/Significance of Application:
Use of DPE with pneumatic fracturing to remove VOCs from silty clay soils and
shallow groundwater
Cleanup Type:
Full scale
Contaminants:
Chlorinated Solvents
Trichloroethene (TCE) is the primary contaminant of concern, with the
highest TCE concentration measured in the soil and groundwater during the
remedial investigation at 46 mg/kg and 37,000 ug/L, respectively
Waste Source:
Storage of waste from vehicle
manufacturing operations
Contacts:
Vendor:
Jeffrey C. Bensch, P.E.
HSI GeoTrans
3035 Prospect Park Drive, Suite 40
Rancho Cordova, California 95670,
Tel: 916-853-1800
Fax: 916-853-1860
E-mail: jbensch@hsigeotrans.com
State Contact:
Mr. George Lincoln
State of California
Regional Water Quality Control Board
San Francisco Bay Region
1515 Clay Street, Suite 1400
Oakland, CA 94612
Additional Contacts:
Zahra M. Zahiraleslamzadeh
Environmental Project Manager
FMC Corporation
1125 Coleman Avenue, Gate 1 Annex
P.O. Box 58123
Santa Clara, California 95052
Tel: 408-289-3141
Fax: 408-289-0195
E-mail: zahra_zahir@udlp.com
Technology:
Dual Phase Extraction (DPE) with Pneumatic Fracturing System
20 dual phase, single pump extraction wells installed at the source area
41 fracture locations (two pneumatic fracture points installed between each
pair of extraction wells)
Following initial fracturing, a low flow/low pressure compressor provided
continuous air injection into each fracture point
Groundwater extraction rate - approximately 35 gpm on a continuous basis
Average vapor flow rate - increased from approximately 39 scfm to over 65
scfm, following pneumatic fracturing
Type/Quantity of Media Treated:
Soil and Groundwater
Depth to groundwater - 8 ft bgs; the first water-bearing zone (A-level aquifer)
present at 20 to 50 ft bgs; second water-bearing zone (B-level aquifer)
present 50 to 90 ft bgs
Sediments underlying the site include marine or basinal clays, coarse channel
deposits, and inter-channel silts and clays
Regulatory Requirements/Cleanup Goals:
Less than 10 mg/L total VOCs in soil.
Results:
The DPE system removed approximately 1,220 pounds of VOCs from the source area
- VOC mass removed by soil vapor extraction - 782 pounds
Average source area VOC concentration in groundwater declined from over 12,000 ug/L to less than 800 ug/L
During first month of operation, about 40% of the mass of VOCs removed was from the vadose zone; by the fifth
month, groundwater extraction was removing more VOC mass than SVE
DPE system shut down June through August 1998 to assess rebound
- VOC concentrations remained relatively constant during shut down and after restart
27 confirmation soil samples averaged 0.93 mg/L total VOCs
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Multi-Phase Extraction at the 328 Site, Santa Clara, CA
Costs:
The cost to design and install the DPE system with pneumatic fracturing was approximately $300,000.
Approximate costs for two years of operation and maintenance services, reporting, and analytical fees were $450,000,
averaging $225,000 per year. Approximately $100,000 was required for the disposal of spent carbon.
The unit cost for treatment of the 0.5-acre source area from 0 to 20 feet bgs was $53 per cubic yard of soil (for
treatment of 16,000 yd3)
Description:
The 328 Site occupies approximately 27.1 acres in a primarily industrial and commercial area of San Jose and Santa
Clara, California, near the San Jose Airport. The 328 Site was used for manufacturing military tracked vehicles, including
assembly and painting operations, from 1963 through 1998. A former waste storage area was the suspected source of
VOC contamination of soil and groundwater at the site. The cleanup of the 328 Site was performed in anticipation of
future commercial/industrial redevelopment and was conducted by FMC Corporation in accordance with the State of
California San Francisco Bay Regional Water Quality Control Board Final Site Cleanup Requirements Order Number 96-
024.
A DPE system, which included 20 dual phase, single pump extraction wells, was used to remove VOCs from silty clay
soils and shallow groundwater at the site Air flow through the soils was enhanced by pneumatic fracturing (PF) between
DPE extraction wells and by supplying continuous low flow/low pressure air to the fractured soils. Over 40 percent of the
VOC mass removal occurred from the vadose zone during the first month of operation. Groundwater extraction provided
greater mass removal rates than soil vapor extraction by the fifth month of operation. The combination of technologies
has allowed soil vapor extraction to be effective in an area that is not well suited for in-situ remediation.
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Dual Phase Extraction at the Defense Supply Center, Richmond, Virginia
Site Name:
Defense Supply Center, Acid Neutralization Pit (ANP)
Location:
Richmond, VA
Period of Operation:
July 1997 - July 1998
Cleanup Authority:
CERCLA - Remedial Action
ROD signed 1992
BSD signed 1995
Purpose/Significance of Application:
Use of DPE to treat soil and groundwater contaminated with chlorinated
solvents, including PCE and TCE
Cleanup Type:
Treatability study
Contaminants:
Chlorinated Solvents
The highest concentrations of VOCs detected in the upper aquifer were 3300
micrograms per liter (//g/L) for PCE, 890 //g/L for TCE, and 26 //g/L for 1,2-
DCE; VOCs were not detected in the lower aquifer
Waste Source:
Leaks from settling basins that
received wastewater from metal
plating operations
Contacts:
Vendor:
Katy L. Allen, P.E.
Law Engineering and Environmental
Services, Inc.
112 Town Park Drive
Kennesaw, GA30144
Tel: (770)421-3400
Regulatory Contact:
Stephen Mihalko
Remedial Project Manager
Virginia Department of Environmental
Quality
P.O. Box 10009
Richmond, VA 23240
Tel: (804)698-4202
Todd Richardson
U.S. EPA Region 3
1650 Arch Street (MC 3HS50)
Philadelphia, PA 19103-2029
Tel: (215)814-5264
E-mail: richardson.todd@epa.gov
Additional Contacts:
Bill Saddington
DSCR Remedial Project Manager
Defense Supply Center Richmond
8000 Jefferson Davis Highway
Richmond, VA 23297-5000
Tel: (804)279-3781
E-mail: bsaddington@dscr.dla.mil
Technology:
Dual Phase Extraction (DPE)
12 DPE wells and six air injection wells arranged in a rectangular grid
DPE wells installed to depth of 22 to 28 ft bgs (10 ft screen length) and
equipped with an electric, submersible (variable-frequency drive) pump,
SVE vacuum at blower - 42 in WC; SVE air flow rate - 314 cfm
Groundwater extraction rate - 37 gpm
DPE radius of influence - 600 to 800 ft, downgradient
Air extracted by the SVE blower was vented to the atmosphere. Extracted
groundwater was pumped directly to a low-profile tray type air stripper to
remove VOCs. Air stripper off-gas was released to the atmosphere
Effluent water was discharged to a storm sewer that flows to a nearby stream.
Type/Quantity of Media Treated:
Soil and Groundwater/17 million gallons of groundwater recovered and treated
The plume area was estimated to be 16,000 square feet
Depth to groundwater -10 to 15 ft bgs; hydraulic gradient - 0.001 to 0.002
ft/ft; aquifer transmissivity - 374 to 504 ftVd
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Dual Phase Extraction at the Defense Supply Center, Richmond, Virginia
Regulatory Requirements/Cleanup Goals:
Remedial goals for PCE - 5 //g/L and TCE - 5 /wg/L, or attainment of an asymptotic trend in contaminant of concern
concentrations in groundwater (whichever occurs first)
The purpose of the DPE treatability study was to collect additional operational data to refine system design parameters,
and to evaluate the effectiveness of an air injection system to facilitate air flow through soils exposed by drawdown of
the groundwater surface
Results:
Total VOC concentrations were reduced by more than 99% in several wells; for example, in two wells located in the
plume center initial concentrations of total VOCs were reduced from 1,980 fj,g/L to 11.9 //g/L and from 1,766 //g/L to
3.5//g/L
Total mass of VOC removed -145 Ib:
- Groundwater VOC mass removal rate - 28 Ib (0.09 Ib/d) total, including 2 Ib (<0.01 Ib/d) aromatic and 26 Ib (0.08
Ib/d) chlorinated
- Soil VOC mass removal rate -117 Ib (0.37 Ib/d) total, including 70 Ib (0.22 Ib/d) aromatic and 47 Ib (0.15 Ib/d)
chlorinated
At the completion of the treatability study, PCE and TCE concentrations remained above the remedial goals in several
wells, and increasing VOC concentrations were observed in wells at the outer edge of the radius of influence of the
DPE system
Costs:
The total cost for the one year treatability study of the DPE system was $538,490, including $134,092 for pre-design
investigations supporting DPE design, $73,198 for engineering design of the DPE system, $205,743 in system
construction costs (equipment only), $24,309 in startup costs, and $101,148 in operation and maintenance, which
included the cost of sample collection and analysis
The total cost per unit volume of groundwater recovered and treated was $0.03 per gallon (based on 17 million gallons
of groundwater)
Description:
The 640-acre Defense Supply Center Richmond (DSCR) is a military support, service, and storage facility located
approximately 11 miles south of the City of Richmond, VA. Since 1942, DSCR has been furnishing and managing
general military supplies to the Armed Forces and several federal civilian agencies. Historic and current industrial
operations at the DSCR have included repair of equipment, engine rebuilding, and refurbishment of combat helmets and
compressed gas cylinders. The Acid Neutralization Pit (ANP) site, located in the northern section of the DSCR, consists
of two former concrete settling basins that received wastewater from metal cleaning operations conducted at one of the
warehouse buildings. In 1985, when the tanks were closed, they were observed to be cracked and broken. Site
investigations determined that the groundwater was contaminated with chlorinated solvents, primarily tetrachloroethene
(PCE) and trichloroethene (TCE). The site was placed on the National Priorities List. A ROD, signed in 1995,
addressed the contamination at the ANP site, and the results of the Feasibility Study identified DPE as a potentially viable
remediation alternative for the site.
A pilot test of the DPE system, along with aquifer testing, was performed in June 1995 to gather site-specific
hydrogeologic data and data on air extraction rates and SVE mass removal rates. The results of the testing supported the
use of DPE for VOC recovery at DSCR. A full-scale system, consisting of 12 DPE wells and six air injection wells were
installed and a treatability study was conducted for one year to evaluate the effectiveness of the full-scale system,
including collecting operational data to refine system design parameters, and to evaluate the effectiveness of the air
injection system. After one year, the DPE system removed 145 pounds of VOCs, including 117 pounds from the soil
vapor and 28 pounds from the groundwater. Although VOC concentrations were reduced in a number of wells, including
reductions of more than 99% in two wells located withing the plume, concentrations of PCE and TCE remained above the
cleanup goals in several wells. Based on the results of the treatability study, the Army's contractor recommended that the
DPE system continue operation and that additional investigations be done to better define the capture zone of the system.
The unit cost was $0.03 per gallon based on 17 million gallons of groundwater treated during the pilot test.
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Dual Vapor Extraction at Tinkham's Garage Superfund Site, Londonderry, NH
Site Name:
Tinkham's Garage Superfund Site
Location:
Londonderry, NH
Period of Operation:
November 22, 1994 to September 29, 1995
Cleanup Authority:
CERCLA
ROD signed 1985
ROD amended March 1989
Purpose/Significance of Application:
Use of D VE to treat soil and groundwater contaminated with chlorinated
solvents, including PCE and TCE
Cleanup Type:
Full scale
Contaminants:
Chlorinated Solvents
Tetrachloroethene (PCE) and trichloroethene (TCE)
Site investigations found total VOCs as high as 652 ppm in soil and 42 ppm
in groundwater
Waste Source:
Discharges of liquids and sludge to
surface soils
Contacts:
Vendor:
Joleen Kealey
Project Manager
Terra Vac, Inc.
213 Rear Broadway
Methuen, MA01844
Tel: (978)688-5280
EPA RPM:
James DiLorenzo
U.S. EPA Region 1 (MC:HBO)
One Congress Street, Suite 1100
Boston, MA 02114-2023
Tel: (617)918-1247
E-mail: dilorenzo.jim@epa.gov
Technology:
Dual Vapor Extraction (DVE)
33 DVE wells divided into 25 shallow DVE wells, screened in the
overburden, and 8 deep DVE wells, screened in the upper bedrock and
overburden; five existing pilot test wells were left in place and used for vapor
extraction; the wells were distributed over three manifold lines
SVE vacuum at blower - 5 in Hg (-68 in WC)
SVE flow rate - 500 scfm, average
Vapors treated using activated carbon; recovered groundwater treated using
air stripping to meet the Deny POTW pre-treatment standards; off-gas from
air stripper treated using vapor phase carbon
Type/Quantity of Media Treated:
Soil and Groundwater/9,000 cubic yards of soil treated
Overburden consisting of inorganic and organic silty clay and sand grading to
fine and medium-grained sand; weathered metamorphic bedrock at
approximately 14feetbgs
Depth to groundwater - 5 to 6 feet bgs
Hydraulic conductivity - range 1 ft/d to 10 ft/d
Regulatory Requirements/Cleanup Goals:
ROD specified 1 ppm total VOCs for soil and 5 ppb each for PCE and TCE in groundwater
Results:
Soil cleanup goals were achieved within ten months of operation; groundwater cleanup goals were not achieved at the
conclusion of DVE system operation and pump-and-treat has been implemented as the site
Approximately 53 pounds of VOCs were removed by the DVE system:
- vapor extraction removed approximately 48 pounds; averaging 0.17 pounds per day
- groundwater extraction removed approximately 5 pounds of VOCs (recovered in the aqueous phase); averaging 0.016
pounds per day
The majority of VOCs recovered were PCE and TCE
VOCs extracted in the vapor phase were reduced from concentrations as high 16 ppm to below 1 ppm (the soil cleanup
goal)
Concentrations of VOCs in groundwater in the source area decreased by over 99% in one well and by 64% in a second
well. However, total VOCs concentrations in groundwater remained above the cleanup goals and ranged from 29 to
237 ppb in the source area
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Dual Vapor Extraction at Tinkham's Garage Superfund Site, Londonderry, NH
Costs:
The actual cost for the project, not including permitting and oversight, was $1.5 million, or $170/cy (based on 9,000 cy
of soil treated).
This cost includes an adjustment for inflation
Description:
The Tinkham's Garage Superfund site includes 375 acres of residential and undeveloped land in Londonderry, NH. Site
investigations in 1981 found soil and groundwater contaminated with VOCs, including PCE, and TCE, resulting from
unauthorized surface discharges of liquids and sludge in 1978 and 1979. Several source areas were identified at the site
including areas near a condominium complex and a one acre area located behind Tinkham's Garage ("Garage Area").
The original 1985 ROD for the site specified excavation of contaminated soil with onsite treatment by either thermal
aeration, composting, or soil washing. As a result of the pre-design and pilot studies, the ROD was amended in March
1989 to require the treatment of contaminated soil by DVE. For cost purposes, all VOC impacted soil was consolidated
for treatment. Contaminated soil from the various areas at the site was excavated and hauled to the Garage Area, where it
was and spread and compacted in place.
The DVE system consisted of 33 DVE wells divided into 25 shallow DVE wells, screened in the overburden, and 8 deep
DVE wells, screened in the upper bedrock and overburden. Five existing pilot test wells were left in place and used for
vapor extraction. The wells were distributed over three manifold lines to provide the greatest coverage over the area of
contamination. After 10 months of operation, approximately 53 pounds of VOCs were removed by the DVE system, with
SVE removing about 48 pounds and groundwater extraction removing about 5 pounds. The soil cleanup goals were
achieved. VOCs extracted in the vapor phase were reduced from concentrations as high as 16 ppm to below 1 ppm (the
soil cleanup goal). However, total VOCs concentrations in groundwater remained above the cleanup goals. According to
Terra Vac, DVE was not intended to achieve groundwater remediation goals; rather the extraction and treatment of
groundwater was necessary to target and remediate soil contamination located within the saturated zone. A pump and
treat system is currently operating at the site to provide a long term migration control remedy for groundwater. The actual
project cost was $1.5 million, or $170/cy (based on 9,000 cy treated).
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Frozen Soil Barrier at Oak Ridge National Laboratory, Oak Ridge, Tennessee
Site Name:
Oak Ridge National Laboratory
Location:
Oak Ridge, Tennessee
Period of Operation:
September 1996 to September 1998
Cleanup Authority:
NRC
Purpose/Significance of Application:
Demonstrate frozen soil barrier for containment of contaminated surface
impoundment
Cleanup Type:
Field demonstration
Contaminants:
Radionuclides
Initial concentrations in sediment included strontium 90 - 75 Curies (Ci) and
cesium 137 -16 Ci
Waste Source:
Nuclear processing operations
Contacts:
Technology Vendor:
Edward Yarmak
Chief Engineer
Arctic Foundations Inc.
(907) 562-2741
Technical Contacts:
Elizabeth Phillips, Principal
Investigator, DOE Oak Ridge
(423)241-6172
Michael Harper, Co-Principal
Investigator, Bechtel Jacobs Company
LLC
(423) 574-7299
Steven Rock, EPA SITE
(513)569-7149
DOE Contact:
Scott McMullin, DOE Savannah River
(803) 725-5608
Technology:
Frozen Soil Barrier
The demonstration used an array of 50 sealed thermocouples installed around
the perimeter of the impoundment, on 6 ft centers to a depth of approximately
SOftbgs
The thermocouples were fabricated from 6 inch schedule 40 steel pipe, and
used carbon dioxide as a working fluid, with an above-ground refrigeration
system, to freeze the soil
The refrigeration system used R-404A, and thermal expansion valves, to
control the amount of freezing
The frozen soil barrier was established in 18 wks, had a length of 300 linear
ft, depth of 30 ft, thickness of 12 ft, frozen soil volume of 108,000 ft3, and
contained a volume of 168,750 ft3
A two-part polyurea coating was spray applied over a non-woven geotextile
fabric to prevent surface water from entering the isolated area
The system was operated first in a freeze-down phase, where the frozen soil
barrier was created; subsequent operation was in maintenance phase
Type/Quantity of Media Treated:
Soil, Sediment, Groundwater
Depth to groundwater is 2 to 9 ft bgs
Groundwater discharges to surface water at several locations around the
impoundment
Complex hydrology due to presence of fractured bedrock
Regulatory Requirements/Cleanup Goals:
Evaluate performance of the barrier for isolating and containing contaminants
No specific cleanup goals were identified
Results:
Performance was evaluated based on groundwater level monitoring, dye tracer studies, and operation tests
Groundwater level monitoring and dye tracer studies (eosine and phloxine dies) showed hydraulic isolation of the
impoundment
A 7-day loss of power test showed that the barrier maintained its integrity during a power outage
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Frozen Soil Barrier at Oak Ridge National Laboratory, Oak Ridge, Tennessee
Costs:
The actual cost for the demonstration was $1,809,000, consisting of $43,000 for site infrastructure, surveys, and
maintenance; $1,253,000 for system design, fabrication, procurement, installation, and start-up; $274,000 for ORNL
site support; and $239,000 for barrier verification
A review of projected costs for frozen soil barriers to grouted barriers showed that frozen soil is less costly for initial
installation and operation, with a break-even point of 8 to 9 yrs
Description:
The demonstration site is a former unlined, earthen impoundment used from 1958 through 1961 for retention/settling of
liquid radioactive wastes generated from operation of a Homogeneous Reactor Experiment (HRE) at DOE's Oak Ridge
facility. The impoundment was 75 ft long by 80 ft wide by 10 ft deep, with a capacity of approximately 310,000 gallons.
In 1970, the impoundment was backfilled with local soils, covered with 8 inches of crushed stone, and capped with
asphalt. A 1986 study found that sediments buried in the impoundment contained strontium 90 and cesium 137, and that
groundwater that moved through this area transported contaminants to surrounding locations, including surface waters.
For the demonstration, a frozen soil barrier was constructed using thermocouple technology. The barrier had a length of
300 linear ft, depth of 30 ft, thickness of 12 ft, frozen soil volume of 108,000 ft3, and contained a volume of 168,750 ft3.
Groundwater level monitoring and dye tracer studies showed that the barrier provided for hydraulic isolation of the
impoundment, and a 7-day loss of power test showed that the barrier maintained its integrity during this time. A cost
analysis comparing projected costs for frozen soil barriers to grouted barriers showed that frozen soil barriers are less
costly for initial installation and operation, with a break-even point of 8 to 9 years.
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Horizontal Wells Demonstrated at U.S. DOE's Savannah River Site and Sandia
National Laboratory
Site Name:
U.S. DOE's Savannah River Site (SRS) and Sandia National Laboratory; Other
Sites (report focuses on use at SRS)
Location:
Aiken, SC, and Albuquerque, NM
Period of Operation:
1988 - 1993
Cleanup Authority:
Not identified
Purpose/Significance of Application:
Demonstrate use of horizontal wells to treat groundwater at multiple sites and
locations
Cleanup Type:
Field demonstration
Contaminants:
Chlorinated solvents
Waste Source:
Multiple sources, including leaks of
solvents
Contacts:
Technical Contacts:
Dawn Kaback
Colorado Center for Environmental
Management
(303) 297-0180 ext. Ill
E-mail: dsdaback@csn.net
Management Contacts:
Skip Chamberlain
DOE EM50
(301) 903-7248
E-mail:
grover. chamberlain@em. doe .gov
James A. Wright
DOE SRS
(803) 725-5608
E-mail: wrightjamesb@srs.gov
Technology:
Pump and Treat (report focuses on installation of horizontal wells above and
below water table)
Four different systems were used for directional drilling and horizontal well
installation
A short radius petroleum industry technology was used to install wells at 65
ft bgs and 150-175 ft bgs; these wells were constructed of steel
A modified petroleum industry technology was used to install two
comparable wells; these wells were constructed of HOPE
A mini-rig utility industry/compactional tool drilling technology was used to
install a well at 35-40 ft bgs; this well was constructed of fiberglass
A mini-rig utility industry technology was used to install two wells at 100 ft
bgs; these wells were constructed of PVC
Type/Quantity of Media Treated:
Groundwater (in situ)
Geology consists of 200 ft of alternating units of permeable sands with low
fines; water table is 120 ft bgs
Regulatory Requirements/Cleanup Goals:
Test the feasibility of installing horizontal wells in unconsolidated sediments using directional drilling technology
Results:
Directional drilling technology was used to install a total of seven wells (steel, stainless steel, PVC, HOPE, and
fiberglass) to depths of 35 -175 ft bgs, with horizontal screen sections ranging from 150 - 400 ft
The wells were used to demonstrate in situ air stripping, in situ bioremediation, and thermally enhanced soil vapor
extraction; four of the wells were later integrated in a vapor extraction remediation system
Costs:
Costs for horizontal wells vary widely based on drilling method and size of rig, type of drilling tool, drilling fluid,
guidance system, vertical depth, total well length, site geology, well materials, and number of personnel on site
Costs for installing a PVC or HOPE well using a small to medium sized utility-type drilling rig are projected as $ 164/m
($50/ft)
Estimated capital costs for horizontal wells were comparable to the capital cost of five vertical wells; O&M costs for
the one horizontal well were less than one-third of the O&M costs for five vertical wells
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Horizontal Wells Demonstrated at U.S. DOE's Savannah River Site and Sandia
National Laboratory
Description:
This report describes the installation and use of horizontal wells at several DOE sites, including Savannah River Site
(SRS) and Sandia National Laboratories. At SRS, seven wells were installed at depths of 35 -175 ft bgs, with horizontal
screen sections ranging from 150 - 400 ft, and using the following materials: steel, stainless steel, PVC, HDPE, and
fiberglass. The wells were used to demonstrate in situ air stripping, in situ bioremediation, and thermally enhanced soil
vapor extraction; four of the wells were later integrated in a vapor extraction correction action. The SRS demonstration
identified two important factors for consideration during design of horizontal wells: (1) trips in and out of the well bore
should be minimized; and (2) well materials should be adequately flexible to negotiate curves.
At Sandia, several pieces of commercial machinery were tested and evaluated, including the water-assisted Jet Trac
Boring System, the air-assisted True Trac Boring System, the P-80 rod pusher, and the Pierce Arrow pneumatic hammer
tool. Based on the results from initial testing of these machines, construction was begun on a prototype machine, the X-
810.
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In Situ Chemical Oxi-Cleanse Process at the Naval Air Station Pensacola Florida,
Operable Unit 10, Pensacola, Florida
Site Name:
Naval Air Station Pensacola Florida, Operable Unit 10
Period of Operation:
November 1998 to May 1999
Purpose/Significance of Application:
Field demonstration of in situ chemical oxidation using Fenton's reagent to treat
chlorinated solvents
Contaminants:
Chlorinated Solvents
TCE primary target for demonstration
Maximum concentration of TCE 3,600 ug/L
Contacts:
Vendors:
Mattehew Dingens
Geo-Cleanse International, Inc.
4 Mark Road, Suite D
Kenilworth, NJ 07033
Telephone: (908) 206-1250
E-mail: geocleanse@earthlink.net
Site Contact:
Tom Kelly
Public Works Center
NAS Pensacola
Telephone: (850) 452-8236
U.S. Navy Contacts:
Maxie Keisler/Michael Maughon
Naval Facilities Engineering Command
SOUTHNAVFACENGCOM
P.O. Box 190010
2 155 Eagle Drive
N. Charleston, SC 29419
Telephone: (843) 820-7322/7422
Email:
keislermr@efdsouth.navfac.navy.mil;
maughonmj @ef dsouth. navf ac . navy . mil
Mark Stuckey
Hazardous Waste Regulation Section
2600 Blair Stone Road MS 4560
Tallahassee, FL 32399-2400
(850) 921-9246
E-mail: stuckey_m@dep. state. fl.us
Location:
Pensacola, Florida
Cleanup Authority:
RCRA Corrective Action
Cleanup Type:
Field demonstration
Waste Source:
Unlined sludge drying bed
Technology:
In-Situ Chemical Oxidation using Fenton's Reagent
Geo-Cleanse's patented process for in situ chemical oxidation conducted
in two phases
Fenton's reagent - hydrogen peroxide (50%) and an equivalent volume
of ferrous iron catalyst
Phase I injected 4,089 gallons of hydrogen peroxide and similar
volumes of reagents through 14 injection wells at a depth of 10-40 ft bgs
Phase 2 injected 6,038 gallons of hydrogen peroxide and similar
volumes of reagent through 10 injection wells (9 old, 1 new), totaling
10,127 gallons; phosphoric acid was added to the reagent mix to
stabilize the hydrogen peroxide
Operating parameters included injection rate of 0.25 - 3 gpm, injection
pressure of 5 - 1 10 psig, pH <8, and CO2 evolution of 5% - >25%
Type/Quantity of Media Treated:
Groundwater
16,500 gallons of groundwater in the source area
Depth to groundwater 0-4 ft; contaminants detected in groundwater 35-
45 ft bgs
Soil classified as fine to medium quartz sand
Properties included porosity >15%; pH 3-6; hydraulic conductivity 2-44
ft/day; dissolved iron >500 mg/L
Regulatory Requirements/Cleanup Goals:
Evaluate effectiveness of in situ chemical oxidation in treating chlorinated solvents
No specific cleanup goals were identified
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In Situ Chemical Oxi-Cleanse Process at the Naval Air Station Pensacola Florida,
Operable Unit 10, Pensacola, Florida
Results:
Phase I reduced TCE concentrations from as high as 3,600 ug/L to 485 ug/L in source area well
This was considered insufficient reduction; Phase I performance was attributed to elevated concentrations of ferrous
iron in the treatment area, likely due to a historic spill of sulfuric acid
Phase II reduced TCE concentrations from 460 ug/L to <5 ug/L in source area well
Costs:
Actual costs for this demonstration, reported by Geo-Cleanse, were $178,338, consisting of $97,018 for capital and
$81,320 for O&M; these costs do not include electrical power or water supply, which were provided by NAS
Pensacola
Description:
Naval Air Station (NAS) Pensacola is a 5,800-acre naval facility located in the western portion of the Florida panhandle.
Operable Unit (OU) 10, is located on 26 acres of Magazine Point Peninsula in the northeast corner of the NAS, was the
site of the former Industrial Wastewater Treatment Plant (IWWTP). The IWWTP treated wastewater from operations
such as painting and electroplating, as well as organic solvents and acids, and included an unlined sludge drying bed. A
groundwater recovery system had been operated for more than 10 years under a RCRA corrective action program to
control migration of contaminated groundwater. In situ chemical oxidation using the Geo-Cleanse patented process was
evaluated for its ability to reduce concentrations of chlorinated solvents in the source area, such that natural attenuation
would be an effective remedy for down-gradient groundwater.
The Geo-Cleanse process used Fenton's reagent (hydrogen peroxide (50%) and an equivalent volume of ferrous iron
catalyst) and was conducted in two phases at OU-10. A total of 10,127 gallons of hydrogen peroxide and similar volumes
of reagents were injected under pressure through 15 wells at a depth of 10-40 ft bgs. Over the two phases, the
concentration of TCE was reduced from 3,600 ug/L to <5 ug/L, as measured in a source area monitoring well. Elevated
concentrations of ferrous iron in the groundwater, due to a historic sulfuric acid spill, limited the effectiveness of the first
phase of injections. In the second phase, phosphoric acid was added to the reagent mix to help stabilize the hydrogen
peroxide in the presence of elevated ferrous iron concentrations. The actual costs for the demonstration were $178,338,
and additional injections were not planned for this site.
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In Situ Chemical Oxidation Using Fenton's Reagent
at Naval Submarine Base Kings Bay, Site 11, Camden County, Georgia
Site Name:
Naval Submarine Base Kings Bay, Site 11
Location:
Camden County, GA
Period of Operation:
November 1998 through August 1999 (Phase 1 and 2)
Cleanup Authority:
RCRA Corrective Action
Purpose/Significance of Application:
Use of Fenton's Reagent to remediate chlorinated solvents in groundwater
Cleanup Type:
Full scale
Contaminants:
Chlorinated Solvents
PCE source was 120 feet long by 40 feet wide; 30 to 40 foot horizon below
ground surface (bgs); PCE concentrations in landfill source area detected as high
as 8,500 ug/L
TCE, DCE, and VC detected at concentrations of more than 9,000 ug/L in
groundwater within the landfill source area
Because PCE concentrations were as much as 5 percent (%) of the pure solubility
phase, the presence of dense non-phase aqueous liquids (DNAPL) was inferred
Waste Source:
Leaks from a landfill
Contacts:
Vendor:
Matthew M. Dingens, Vice President Sales
J. Daniel Bryant, Ph.D., Senior Geologist
Geo-Cleanse International, Inc.
4 Mark Road, Suite C
Kenilworth, NJ 07033
Telephone: 908-206-1250
Facsimile: 908-206-1251
E-mail: geocleanse@earthlink.net
State Contact:
Billy Hendricks
Compliance Officer
State of Georgia Environmental Protection
Division
205 Butler Street SE, Suite 1162
Atlanta, GA 30334
Telephone: 404-656-2833
E-mail: billy_hendricks@mail.dnr.state.ga.us
Navy Contact:
Clifton C. Casey, P.E.
Southern Division NAVFAC
Environmental Department (Code 18)
P.O. Box 190010
North Charleston, SC 29419-9010
Telephone: 843-820-5561
E-mail: CaseyCC@EFDSOUTH.NAVFAC.
NAVY.mil
Technology:
In Situ Chemical Oxidation; Fenton's reagent
Geo-Cleanse's patented process for in situ chemical oxidation using
Fenton's reagent
Fenton's reagent - hydrogen peroxide (50%) and an equivalent
volume of ferrous iron catalyst were delivered via injection to the
subsurface
Total of 44 injectors - 23 for Phase 1, including deep (42 ft bgs) and
shallow (32 ft bgs) injectors; 21 injectors added for Phase 2, including
deep (40 ft bgs) and shallow (35 ft bgs) injectors
Phase 1 - two injections of Fenton's reagent into the subsurface,
totaling 12,045 gallons (8,257 gallons November 2-21, 1998; 3,788
gallons February 8-14, 1999) of solution were injected.
Phase 2 - two injections of Fenton's reagent into the subsurface,
totaling 11,247 gallons (8,283 gallons June 3-11, 1999; 2,964 gallons
July 12-15, 1999)
Type/Quantity of Media Treated:
Groundwater
Estimated volume of groundwater treated during the Phase Iwas
78,989 gallons (based on a treatment volume of 1,778 cubic yards
and a porosity of 22%)
Information on volume of groundwater treated during Phase 2 was not
provided
Regulatory Requirements/Cleanup Goals:
Cleanup goal for the RCRA corrective action at Site 11 was established by the state at 100 ug/L for total chlorinated
aliphatic compounds (CACs), defined as the sum of PCE, TCE, cis-1,2 DCE, and VC concentrations in groundwater
128
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In Situ Chemical Oxidation Using Fenton's Reagent
at Naval Submarine Base Kings Bay, Site 11, Camden County, Georgia
Results:
Phase 1 - after first injection, total CAC concentrations were reduced to below the cleanup goal in five of the seven
monitoring wells, including one well located within the source area where concentrations had been reduced by >97%.
However, total CAC concentrations remained above the cleanup goal in two downgradient monitoring wells; after
second injection, total CAC concentration remained at or above the cleanup goal in the two downgradient wells and
were found to have increased in other wells. As a result, a second phase of treatment was performed
Phase 2 - after the first injection, total CAC concentrations were reduced to below the cleanup goal in all but one
downgradient monitoring well; however, concentrations increased above the cleanup goal in two downgradient
injectors. After the second injection, total CAC concentrations were reduced to below the cleanup goal in the
downgradient injectors and remained below the cleanup goal in all wells except for the one downgradient well (total
CAC concentration was primarily DCE)
Sample results from August 1999 showed elevated concentrations of total CACs in one injector located to the east of
the area of concern. The Navy has determined that there is a previously unknown source of contamination in this area
and is addressing the cleanup of the area separate from the Site 11 area of concern. Data on this cleanup were not
available at the time of this report
Costs:
Total proposed cost for application of in situ chemical oxidation of Fenton's reagent using the Geo-Cleanse process
was approximately $223,000 for Phase 1, including costs for reagents, mobilization, onsite treatment time, injection
and monitoring equipment, documentation, and injector construction oversight and materials
No additional cost data were provided
Description:
Naval Submarine Base (NSB) Kings Bay, 16,000 acre facility in Camden County, GA, is the U.S. Atlantic Fleet home
port to the next generation of ballistic submarines, and maintains and operates administration and personnel support
facilities. Site 11 is the location of a former 25-acre landfill at NSB Kings Bay, known as the Old Camden County
landfill, that was operated by the county during the mid-1970s to 1980. A variety of wastes from the local Kings Bay
community and the Navy were disposed of in the landfill, including solvents and municipal waste. Site investigations
found the groundwater in the area to be contaminated with PCE, as well as TCE, DCE, and VC. On March 18, 1994,
NSB Kings Bay entered into a Corrective Action Consent Order with the Georgia Environmental Protection Division to
address prior releases of hazardous constituents from Site 11. The Navy selected in situ chemical oxidation using
Fenton's reagent for this site based on its successful use by the U.S. Department of Energy (DOE) in remediating
chlorinated solvent contaminated groundwater at the Savannah River site. The Navy's approach to the cleanup of Site 11
was to use in situ chemical oxidation to reduce groundwater contaminant concentrations in the source area followed by
natural attenuation to address residual contamination.
For the remeditation of Site 11, the Geo-Cleanseฎ process, a patented in situ chemical oxidation technology using
Fenton's reagent, was used. The Fenton's reagent consisted of hydrogen peroxide (50%) and an equivalent volume of
ferrous iron catalyst that were injected into the subsurface under pressure. The remediation was performed in two phases.
For Phase 1, 23 injectors were installed in and around the area of concern and there were two injections of Fenton's
reagent into the subsurface, totaling 12,045 gallons. During Phase 2, the system was expanded to add 21 injectors and
there were two injections of Fenton's reagent into the subsurface, totaling 11,247 gallons. After two phases of treatment
using the Geo-Cleanseฎ process, total CAC concentrations had been reduced to below the cleanup goal of 100 ug/L in all
but one well located downgradient of the area of concern. The total CAC concentrations in this well were primarily DCE.
The first phase of treatment (two injections) reduced total CAC concentrations to below the cleanup goal in five of the
seven monitoring wells, including a reduction of >97% in the well located within the source area. Cost data provided by
Geo-Cleanse indicated that the proposed cost for application of in situ chemical oxidation of Fenton's reagent was
approximately $223,000 for Phase 1. No additional cost data were available.
In August 1999, elevated concentrations of total CACs concentrations were found in an injector located to the east of the
area of concern, indicating the presence of an additional contamination source area in the shallow soil. The soil in this
area has been excavated and the Navy is planning to use chemical oxidation to polish the groundwater in this area.
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Six Phase Heating at the Skokie, Illinois Site
Site Name:
Confidential Manufacturing Facility
Location:
Skokie, Illinois
Period of Operation:
June 4, 1998 to April 30, 1999
Cleanup Authority:
State Voluntary Cleanup
Purpose/Significance of Application:
Use of SPH to remediate chlorinated solvents in soil and groundwater
Cleanup Type:
Full scale
Contaminants:
Chlorinated Solvents
Primary contaminants included TCE, TCA, and DCE
Concentrations in groundwater at start of SPH remediation (June 1998) -
TCE (130 mg/L maximum; 54.4 mg/L average), TCA (150 mg/L maximum;
52.3 mg/L average) and DCE (160 mg/L maximum; 37.6 mg/L average)
DNAPL present
Waste Source:
Leaks from spill contaminant systems
and underground storage tanks
Contacts:
Vendor:
David Fleming, Corporate
Development Leader
Current Environmental Solutions
P.O. Box 50387
Bellevue, WA 98015
Telephone: 425-603-9036
Fax: 425-643-7590
E-mail: david@cesiweb.com
Greg Beyke, Operations Manager
Current Environmental Solutions
1100 Laurel Crest Way
Marietta, GA 30064
Telephone: 770-794-1168
E-mail: greg@cesiweb.com
EPA Contact:
Stan Komperda
Illinois EPA
Bureau of Land, No. 24
1021 East North Grand Avenue
Springfield, IL 62794-9276
Telephone: 217-782-5504
E-mail: epa4207@epa.state.il.us
PRP Oversight Contractor:
Gregory Smith
ENSR
27755 Diehl Rd.
Warrenville, IL 60555
Telephone: 630-836-1700
Technology:
Six-Phase Heating (electrical resistive heating combined with soil vapor
extraction)
Initial network of 107 electrodes (85 beneath the floor of a warehouse
building) operated from June to November 1998; 78 electrodes added (185
total) and operated from December 1998 to April 1999 to treat additional area
of contamination
Electrodes designed to be electrically conductive throughout a depth interval
of 11 to 21 feet bgs and to increase the subsurface temperature in the depth
interval of 5 to 24 feet bgs to the boiling point of water
Electrical power input -13.8 kV local service at 1250 kW; 1,775 megawatt
hours (MW-hrs.) consumed from June 4 to November 20, 1998; information
not provided for Dec. 1998/Jan. 1999 through May 1999
Temperature -100 ฐC; operating pressure/vacuum - 7.5 inches of mercury
(Hg)
Network of 37 soil vapor extraction wells, screened to 5 feet bgs, were used
to capture vapors
Off-gas was condensed and sent through an air stripper prior to discharge to
the atmosphere
Type/Quantity of Media Treated:
Soil and groundwater
23,100 cubic yards treated from June to November 1998
Additional 11,500 cubic yards treated from December 1998 to April 1999
Soil at site - heterogeneous silty sands with clay lenses to 18 feet bgs
(hydraulic conductivity -10"4 to 10"5 cm/sec); underlain by dense clay till
aquitard (hydraulic conductivity -10"8 cm/sec)
Depth to groundwater- 7 feet bgs
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Six Phase Heating at the Skokie, Illinois Site
Regulatory Requirements/Cleanup Goals:
Tier III cleanup criteria for groundwater; developed by ENSR and approved by Illinois EPA as the cleanup goals for
the site
Tier III goals were TCE (17.5 mg/L); TCA (8.85 mg/L); and DCE (35.5 mg/L)
No criteria established for soil
Results:
Results for the remediation of the initial 23,000 cubic yards of contamination:
By December 1998 (six months of operation), theTier III cleanup goals were achieved for TCE, TCA, and DCE in all
wells in the initial area of contamination
During this time, average groundwater concentrations were reduced by more than 99% for TCE (54.4 mg/L to 0.4
mg/L); more than 99% for TCA (52.3 mg/L to 0.2 mg/L), and more than 97% for DCE (37.6 mg/L to 0.8 mg/L)
Results for the remediation of the additional 11,000 cubic yards of contamination:
By April 1999 (five months of operation), theTier III cleanup goals were achieved for TCE, TCA, and DCE in all wells
in the additional area of contamination
During this time, average groundwater concentrations were reduced by more than 96% for TCE (4.16 mg/L to 0.15
mg/L); more than 92% for TCA (14 mg/L to 1 mg/L); and more than 90% for DCE (2.39 mg/L to 0.24 mg/L)
Costs:
Cost data were provided on a unit cost basis; total project cost data were not provided
The unit cost for this technology of $32 per cubic yard is based on a calculated treatment volume of 23,100 cubic yards,
or a treatment area of 26,000 square ft and a depth of 24 ft bgs
The unit cost for the treatment from December 1998 through May 1999 also was $32 per cubic yard, based on a
calculated treatment volume of 11,500 cubic yards
Description:
The Skokie site is a former electronics manufacturing facility located in Skokie, Illinois. From 1958 to 1988,
manufacturing operations included machining and electroplating. Soil and groundwater at the site was found to be
contaminated with solvents (TCE and TCA), including large pools of dense nonaqueous phase liquids (DNAPL). The site
is being remediated under Illinois' voluntary Site Remediation Program. From 1991 to 1998, steam injection combined
with groundwater and vapor extraction reduced the area of contamination from about 115,000 square feet to about 23,000
square feet. As of early 1998, the remaining area to be remediated represented four source locations where manmade
subsurface features limited the effectiveness of the previously used steam-based remediation system. To complete the
remediation, the site owner selected Six-Phase Heating (SPH).
The SPH process operated at the Skokie site from June 4, 1998 to November 20, 1998 to remediate the initial estimated
23,000 cubic yards of contaminated soil and groundwater. Based on the results of sampling conducted in December 1998
that indicated there was a potential for vinyl chloride to be produced outside the initial treatment area at levels in excess of
the cleanup levels, a decision was made to expand the SPH system to cover an additional 11,500 cubic yard treatment
area. The SPH system restarted in December 1998 and operated until April 30, 1999 when cleanup goals were achieved
in the additional area. The unit cost for this technology was $32 per cubic yard for the initial 23,000 cubic yards of
contaminated soil and groundwater and also for the additional 11,500 cubic yards of contaminated media.
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Hydrous Pyrolysis Oxidation/Dynamic Underground Stripping (HPO/DUS) at
Visalia Superfund Site, CA
Site Name:
Visalia Superfund Site
(report also includes treatment at DOE Portsmouth Site, Piketon, OH)
Period of Operation:
June 1997 to mid-1999
Purpose/Significance of Application:
Use of HPO/DUS for treatment of large quantity of creosote in groundwater
Contaminants:
Semivolatiles - Halogenated and Nonhalogenated
Creosote and pentachlorophenol were the primary contaminants
Contacts:
Site Contact:
Southern California Edison
Vendor:
Steam Tech Environmental Services
Technical Contact:
Robin Newmark
Lawrence Livermore National
Laboratory
Telephone: (925) 423-3644
E-mail: newmarkl@llnl.gov
EPA Contact:
Kathi Moore
U.S. EPA Region 9
75 Hawthorne Street
San Francisco, CA 94 105
(415) 744-2221
Other Contacts:
James Wright
DOE SRS
Telephone: (803) 725-5608
E-mail: jamesb.wright@srs.gov
Kathy Kauffman
LLNL
Telephone: (925) 422-2646
Location:
Visalia, CA
Cleanup Authority:
CERCLA
ROD - 6/10/94
Cleanup Type:
Field demonstration
Waste Source:
Wood preservation operations
Technology:
Hydrous Pyrolysis Oxidation/Dynamic Underground Stripping
DUS involved continuous injection of steam and air into permeable zones
over a 5 month period to create a steam front, which swept contaminants from
the injection wells toward extraction wells; when the steam front collapsed,
groundwater reentered the treatment zone and the steam/vacuum extraction
cycle was repeated in a process called "huff and puff
System used 1 1 injection and 8 extraction wells; steam and air were injected
to 80 - 100 ft bgs in paired wells; average temperature was 60ฐC (maximum
140ฐC), with groundwater extracted at 350 - 400 gpm
Extracted vapors initially were treated with carbon; however, because of the
expense of the carbon, it was replaced with treatment in steam boilers
Extracted groundwater was treated with filtration and discharged to a POTW
HPO occurred after the steam and air injection stopped, when groundwater
returned to the heated zone and mixed with oxygen; contaminants were
rapidly oxidized in this environment
Underground mapping was performed using 29 electrical resistance
tomography (ERT) wells and thermocouples to track the steam fronts and
heated areas
Type/Quantity of Media Treated:
Groundwater
Three distinct water-bearing zones are present; shallow aquifers from 35 to 75
ft bgs, an intermediate aquifer from 75 to 105 ft bgs, and a deep aquifer below
120 ft bgs; the HPO/DUS system targeted the intermediate aquifer
Regulatory Requirements/Cleanup Goals:
Evaluate the performance of DUS/HPO for removing creosote
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Hydrous Pyrolysis Oxidation/Dynamic Underground Stripping (HPO/DUS) at
Visalia Superfund Site, CA
Results:
During 25 months of operation, a total of 1,130,000 Ibs (141,000 gals) of creosote were removed or treated (10,400
Ibs/wk)
Approximately 50% of the contaminants were removed in free phase, 16% as vapors, 16% in an aqueous phase, and
17% destroyed by HPO in situ
Monitoring the progress of the heating fronts showed that all the aquifer was treated
Costs:
A comparison of projected costs for use of HPO/DUS and pump and treat at Visalia showed that HPO/DUS would have
larger capital and annual O&M costs, but would be operated for less years, than pump and treat; projected unit costs
were $39/yd3 for HPO/DUS and $110/yd3 for pump and treat
Key factors affecting the cost analysis include the groundwater extraction capacity and size of plume
Description:
Since the 1920's, the four-acre Visalia Poleyard was the site of a wood preservation treatment plant for power poles. Poles
were dipped into creosote, a pentachlorophenol compound, or both. Soil and groundwater to 100 ft bgs were contaminated
with creosote, pentachlorophenol, and diesel fuel. A pump and treat system was installed in 1975 and several years later a
slurry wall was constructed to contain the plume at its leading edge.
A field demonstration of Hydrous Pyrolysis Oxidation/Dynamic Underground Stripping (HPO/DUS) was conducted at
Visalia over a 25-month period. HPO/DUS is a combination of technologies including steam and air injection, vapor
extraction, pump and treat, and electrical resistance tomography. The system used at Visalia consisted of 11 injection and
8 extraction wells; steam and air were injected to 80 -100 ft bgs in paired wells. Groundwater was extracted at 350-400
gpm. During the 25 months of operation, atotal of 1,130,000 Ibs (141,000 gals) of creosote were removed ortreated
(10,400 Ibs/wk). Approximately 50% of the contaminants were removed in free phase, 16% as vapors, 16% in an aqueous
phase, and 17% treated by HPO in situ.
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Intrinsic Remediation at AOCs 43G and 43J, Fort Devens, Massachusetts
Site Name:
Areas of Concern (AOCs) 43G and 43 J
Location:
Fort Devens, Massachusetts
Period of Operation:
Intrinsic remediation assessment (IRA) - 3/97 to 6/99
Long-term monitoring -12/99 to 12/11 (AOC 43G) and 12/04 (AOC 43 J).
End dates are estimated.
Cleanup Authority:
CERCLA and State
Record of Decision (ROD) signed on
October 17, 1996
Purpose/Significance of Application:
This project demonstrates that intrinsic remediation is a viable treatment
alternative at sites contaminated with BTEX.
Cleanup Type:
Full scale
Contaminants:
Organic Compounds
Volatiles (nonhalogenated)
BTEX (benzene, toluene, ethylbenzene, and xylene)
Maximum benzene concentrations:
- 2,OOOmg/LatAOC43G
- 300 mg/L at AOC 43J
Waste Source:
Leaks and spills from former gasoline and
waste oil USTs.
Contacts:
Project Management:
Mark Applebee
USAGE, New England Division
696 Virginia Road
Concord, MA 01742-2751
mark.r.applebee@usace.army.mil
Jim Chambers
BRAC Environmental Coordinator
Devens Reserve Forces Training Area
30 Quebec Street
Devens, MA 01432-4429
(978)796-3114
ChambersJ@devens-emhl .army.mil
Vendor:
Gina Nyberg
Stone & Webster Environmental
Technology & Services
245 Summer Street
Boston, MA 02210
(617) 589-2527
gina. nyberg@stoneweb. com
Regulatory Points of Contact:
Jerry Keefe
USEPA, Region 1
1 Congress St., Suite 1100
(Mailcode HBT)
Boston, MA 02114-2023
(617) 918-1393
Keefe.Jerry@epamail.epa.gov
John Regan
MADEP
627 Main Street
Worchester, MA 01605
(978) 792-7653
John.Regan-EQE@state.ma.us
Technology:
Intrinsic Remediation
Remediation approach requires a demonstration, through intensive site
characterization, that natural biological processes are destroying
contaminants in situ and that the site will reach specified remediation
goals within 30 years
The demonstration includes:
- Observation of a stable or decreasing contaminant plume over time
- Correlation of contaminant plumes with electron acceptor distribution
- Modeling studies that indicate attenuation due to processes other than
dispersion, volatilization, and sorption
Eight quarterly sampling rounds were conducted to accumulate the data
necessary for the remediation demonstration
Annual long-term monitoring is required to confirm that adequate
remediation is occurring
Type/Quantity of Media Treated:
The contaminant plume at AOC 43 G extends 320 feet downgradient
from the source area and is 230 feet wide. The contaminant plume at
AOC 43 J extends 250 feet downgradient from the source area and is 190
feet wide. Plume dimensions were calculated based on groundwater
concentrations above the maximum contaminant level (MCL) for
benzene in March 1997
The aquifer is approximately 5 feet thick at AOC 43G and 10 feet thick
at AOC 43J
Free product has been detected
Electron acceptors are present in the groundwater at varying levels
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Intrinsic Remediation at AOCs 43G and 43J, Fort Devens, Massachusetts
Regulatory Requirements/Cleanup Goals:
The ROD established the preliminary remediation goals (PRGs) for AOCs 43G and 43 J that must be met within 30
years; most goals were based on MCLs.
Property boundary performance standards for AOCs 43 G and 43 J were based on the PRGs and the Massachusetts
Contingency Plan (MCP) GW-1 standards for extractable and volatile petroleum hydrocarbons (EPH/VPH)
Results:
The results of the Mann-Kendall statistical trend analyses on BTEX compounds at both sites indicated that groundwater
concentrations exhibit a statistically significant decreasing trend
At both sites, there is significant evidence of the utilization of electron acceptors and the appearance of degradation
products, suggesting that contaminants are being biologically degraded and not just physically diluted or dispersed
Modeling indicates that the contaminant plumes at both sites will be reduced below the applicable MCLs between 8 and
15 years after the ROD was signed
Fate and transport modeling demonstrated that it was unlikely that the BTEX plumes would move off of Army property
Costs:
The total cost for the IRA was $671,642
The anticipated long-term monitoring and reporting costs are $50,000 per year
The number of wells sampled is a significant cost element because it effects the duration of field sampling events,
analytical expenses, and the effort involved with tracking and assessing data
Description:
AOCs 43G and 43J are two former gasoline stations operated at Fort Devens. These sites were also used for motor pool
operations during World War II. BTEX and TPH contamination in soil and groundwater at these sites is consistent with
the historical use of the areas. The Army determined that intrinsic remediation was the most appropriate remedy for the
contamination at both sites. The remedy consists of intrinsic remediation, IRA data collection and groundwater modeling,
long-term groundwater monitoring and annual reporting, and five-year site reviews
The IRAs for AOCs 43G and 43J demonstrated that intrinsic remediation is working and that the Army will not need to
initiate additional cleanup actions. Specifically, modeling indicates that the concentrations of the contaminants of concern
will be below groundwater cleanup levels in less than 30 years and that they will not migrate off of Army property
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Monitored Natural Attenuation at Keesler Air Force Base, Mississippi
Site Name:
Keesler Air Force Base (AFB), Base Exchange Service Station, Area of Concern
- A (ST-06)
Location:
Biloxi, Mississippi
Period of Operation:
September 1997 to April 1999
Cleanup Authority:
EPA Region 4 and Mississippi DEQ
Purpose/Significance of Application:
Monitored natural attenuation for a gasoline contaminated site
Cleanup Type:
UST cleanup
Contaminants:
BTEX, Lead
Soil concentrations measured as high as 166 mg/kg for BTEX and 8.7 mg/kg
for lead
Groundwater concentrations measured as high as 22,400 ug/L for BTEX and
21ug/Lforlead
Waste Source:
Gasoline USTs and associated piping
Contacts:
Vendor:
John Hicks
Parsons Engineering Science, Inc.
1700 Broadway, Suite 900
Denver, CO 80290
(303)831-8100
john.hicks@parsons.com
Site Contact:
Lisa Noble
81stCES/CEVR
508 L Street
Keesler AFB, MS 39534-2115
(601)377-5803
noblel@ces.kee.aetc.af.mil.
Air Force Contact:
Jim Gonzales
AFCEE/ERT
3207 North Rd., Building 532
Brooks AFB, TX 78235-5363
(210) 536-4324
james.gonzales@hqafcee.brooks.af.mil
EPA Contact:
Robert Pope
USEPA Region 4
61ForsythSt, SW
Atlanta, GA 30303-3104
(404) 562-8506.
State Contact:
Bob Merrill
Mississippi DEQ
P.O. Box 10385
Jackson, MS 39289-0385
(601)961-5171
Technology:
Monitored Natural Attenuation
Bioventing and density-driven convection in-well aeration were used
previously as source control measures
Monitoring of 9 groundwater wells planned for five years
Samples will be analyzed for aromatic volatile organics and geochemical
parameters
Type/Quantity of Media Treated:
Soil, groundwater, and soil gas
Source area plus dissolved plume covers approximately 4.0 acres
- Fine- to medium-grained sand to 20 ft bgs, underlain by a clay layer of
unknown thickness
- Groundwater present at 5 to 9 ft bgs
- Average hydraulic conductivity of sand zone is 40 ft/day
- Calculated horizontal groundwater flow velocity is 0.8 ft/day
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Monitored Natural Attenuation at Keesler Air Force Base, Mississippi
Regulatory Requirements/Cleanup Goals:
Cleanup levels for BTEX was 100 ppm for soil and 18 ppm for groundwater
Risk-based screening levels for lead was identified as 400 ppm in soil and 15 ug/L in groundwater
OSHA PELs were used as screening levels for BTEX in soil gas
Results:
In February 1998, the only contaminant in soil to exceed the cleanup levels was BTEX (1 sample at 166 mg/kg); BTEX
(1 sample at 22.4 mg/L) and lead (3 samples - 21, 21 and 16 ug/L) exceeded the cleanup levels in groundwater. Only
lead in groundwater was identified as a chemical of potential concern for this site
Data from 1988 to 1998 indicated substantial oscillation in dissolved BTEX concentrations at the plume core since May
1993, but that the total BTEX plume appears to have been relatively stable
Costs:
The estimated O&M cost for long-term monitoring was identified as $15,000 per event
Description:
In 1987, 10 USTs were removed from the Keesler Air Force Base, in Biloxi, Mississippi. During the removals, there was
evidence that one or more of the tanks had leaked, and site investigations found gasoline components in the soil and
groundwater, including BTEX and lead. A bioventing system was installed in 1993 and operated for three years. A
density-driven convection (DDC) in-well aeration system was installed in 1996 and operated at least through February
1998. Based on a RBCA analysis, the recommended final remedial action was monitored natural attenuation. The
recommendation was based on the finding that the site contamination does not currently (and will not in the future) pose a
significant risk to potential receptors, the dissolved plume is stable and degrading, and institutional controls can be
maintained with a high level of confidence. The RBCA analysis showed that concentrations of target analytes in all
sampled media do not exceed applicable MDEQ RBSLs or OSHA PELs, and that detected concentrations of total lead in
groundwater do not pose a risk to potential receptors.
Geochemical data indicated that biodegradation of fuel hydrocarbons is occurring at the site, primarily via the anaerobic
processes of sulfate reduction, nitrogen fixation, and methanogenesis. Previous and current source removal efforts have
reduced hydrocarbon concentrations in vadose zone and saturated zone soils, and the current system does not have an
adverse effect on the natural attenuation processes at the site. A long-term monitoring plan was negotiated with the MDEQ
and USEPA Region 4 that included monitoring of nine wells for five years. Monitoring will occur quarterly for the first
year and annually for the second through fifth years. The purpose of the monitoring is to verify the effectiveness of
naturally-occurring remediation processes at limiting plume migration and reducing dissolved contaminant concentrations.
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Monitored Natural Attenuation at Kelly Air Force Base , Former Building 2093
Gas Station, Texas
Site Name:
Kelly Air Force Base (AFB), Former Building 2093 Gas Station
Period of Operation:
July 1997 to July 1998
Purpose/Significance of Application:
Monitored natural attenuation for a gasoline-contaminated site
Contaminants:
Gasoline constituents
BTEX concentrations in groundwater measured as high as 2,807 ug/L in
November 1997
Contacts:
Vendor:
John Hicks
Parsons Engineering Science, Inc.
1700 Broadway, Suite 900
Denver, CO 80290
(303)831-8100
john.hicks@parsons.com
Site Contact:
Jerry Arriaga
SA-ALC/EMRO
301 Tinker Dr., Suite 2
Bldg. 301
Kelly AFB, TX 78241
(210) 925-1819
garriaga@emgatel.kelly.af.mil.
Air Force Contact:
Jim Gonzales
AFCEE/ERT
3207 North Rd., Building 532
Brooks AFB, TX 78235-5363
(210) 536-4324
james.gonzales@hqafcee.brooks.af.mil.
State Contact:
Antonio Pena
TNRCC
P.O. Box 13087
Austin, TX, 78711-3087
(512)239-2200
APENA@tnrcc.state.tx.us.
Technology:
Location:
Kelly AFB, Texas
Cleanup Authority:
Texas Natural Resource Conservation
Commission
Petroleum Storage Tank Division
Cleanup Type:
UST cleanup
Waste Source:
Leaking gasoline USTs and associated
piping
Monitored Natural Attenuation
Monitoring network not described
Type/Quantity of Media Treated:
Soil, groundwater, and soil gas
Source area plus dissolved plume covers 1.5 acres
The site is underlain by silty clay; with a distinct clay unit from 35
to\ A -A- 1~
40 it DgS
Groundwater occurs primarily in silt and possibly caliche seams that
produce only small amounts of water; static groundwater levels
range from 5 to 25 feet bgs, depending on location and season
Hydraulic conductivity of the silty clay unit is 0.2 to 0.5 ft/day based
on slug tests, and the estimated horizontal groundwater flow
velocity is 3 1 ft/year
Regulatory Requirements/Cleanup Goals:
TNRCC Plan A target concentrations for Category II aquifers, and TNRCC target concentrations for construction
worker exposure are the cleanup goals for affected groundwater
138
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Monitored Natural Attenuation at Kelly Air Force Base , Former Building 2093
Gas Station, Texas
Results:
Based on a Tier 1 screening, only the Plan A concentration for benzene of 0.0294 mg/L was exceeded, and benzene in
groundwater and soil was identified as a contaminant of potential concern
Fate and transport modeling using the analytical code BIOSCREEN indicated that the maximum migration distance of
dissolved benzene from the source area will be approximately 300 ft, and that dissolved benzene concentrations will be
below groundwater quality standards within 10 years
Results of groundwater sampling events indicated that the dissolved contaminant plume is not increasing in areal extent,
and that natural attenuation indicator parameters exhibit trends associated with a plume that is being naturally degraded.
The site was identified as a candidate for immediate closure according to TNRCC guidance
The Air Force will restrict use of the shallow groundwater at the site until all dissolved benzene concentrations decrease
below TNRCC Plan A Category II criterion of 0.0294 mg/L
Maximum-detected concentrations of BTEX in soil gas were compared to the chemical-specific OSHA 8-hour time-
weighted average permissible exposure limits (PELs), and there were no exceedences
Costs:
Not provided
Description:
As a result of UST integrity testing in 1989, the former Building 2093 Gas Station at Kelly Air Force Base, in Texas, was
found to be leaking, and the UST and associated piping were removed in 1991. Site investigations found BTEX
contamination in the groundwater. A 1-year-long bioventing pilot test was concluded in January 1995; the test results
indicated that site soils were not sufficiently permeable to enable use of this in situ source reduction technique. Later in
1995, the dispensing islands and remaining below-grade piping were removed, and 2,750 cubic yards of soil in the area of
the former tank pad and dispensing islands were excavated. Based on a RBCA analysis, the TNRCC issued a no-further-
action memorandum closing the site based on plume stability, the occurrence of natural attenuation of fuel residuals, and
the conclusion that site contamination will not pose a significant risk to potential receptors.
139
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In Situ Permeable Reactive Barriers for Contaminated Groundwater
at Fry Canyon
Site Name:
Fry Canyon
Location:
Southeastern Utah
Period of Operation:
September 1997 - ongoing (performance data for first year of demonstration -
September 1997 to September 1998)
Cleanup Authority:
Not applicable
Purpose/Significance of Application:
Field demonstration of three types of PRBs to treat uranium-contaminated
groundwater
Cleanup Type:
Field demonstration
Contaminants:
Radionuclides (uranium) and metals
Uranium concentrations in groundwater found at levels as high as 16,300 ug/L
Iron and manganese concentrations found in groundwater at 90 ug/1 and 180
ug/L, respectively
Waste Source:
Subsurface drainage from abandoned
uranium ore mill ponds
Contacts:
EPA Contact:
Ed Feltcorn
U.S. EPA/ORIA
Ariel Rios Building
1200 Pennsylvania Avenue, N.W.
Washington, D.C. 20460
Telephone: 202-564-9422
Fax: 202-565-2037
E-mail: feltcorn.ed@epa.gov
USGS Contact:
David Naftz, Ph.D.
U.S. Geological Survey
2329 West Orton Circle
West Valley City, UT 84119-2047
Telephone: 801-908-5053
Fax: 801-908-5001
E-mail: dlnaftz@usgs.gov
Technology:
Permeable Reactive Barriers (PRBs)
Three types of PRBs demonstrated - phosphate (PO4), zero valent iron (ZVI),
and amorphous ferric oxyhydroxide (AFO)
PRBs installed side-by-side and operated concurrently
Funnel and gate design; each PRB was keyed, along with each of the
impermeable funnels, into the bedrock (Cedar Mesa Sandstone formation)
beneath the colluvial aquifer
1.5-foot layer of pea gravel on the upgradient side of the PRBs to facilitate
uniform flow of groundwater into the PRBs
"As built" volume of reactive material was: PO4 - 67.2 ft3; ZVI - 77.7 ft3, and
AFO - 67.2 ft3
Each PRB contains a total of 22 monitoring wells, configured in two parallel
"rows" - Row 1 and Row 2
Estimated range of groundwater velocity through PRBs - 0.2 - 2.5 ft/day
Type/Quantity of Media Treated:
Groundwater - 33,000 cubic feet (about 200,000 gallons)
Depth to groundwater - 8 feet bgs
Colluvial aquifer ranges in depth from 2-5 feet
Groundwater flow rate - 0.2-2.5 ft/day
Transmissivity -10-200 ft/day
Hydraulic conductivity - 55-85 ft/day
Regulatory Requirements/Cleanup Goals:
The objective of the demonstration project is to evaluate the use of three types of PRBs in controlling the migration of
uranium and metals in groundwater
Results:
Performance data were available for the first year (September 1997 to September 1998) of this ongoing demonstration
The ZVI PRB showed the best removal rate of the three PRBs tested, removing more than 99.9% of the uranium from
the groundwater
The PO4 PRB initially removed more than 99% of the uranium from the groundwater, with the removal rate decreasing
to 60-70% in January 1998, then increasing to 92% as of September 1998. Available results from tracer tests indicated
that there was no leakage from the ZVI PRB to the PO4 PRB; rather, the increased efficiency in the PO4 PRB is the
result of anoxic conditions caused by the release of PO4
The AFO PRB had the lowest removal rate, consistently removing less than 90% of the uranium from the groundwater;
with removal rates as low as 37% observed
140
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In Situ Permeable Reactive Barriers for Contaminated Groundwater
at Fry Canyon
Costs:
The cost for the PRB demonstration included $280,000 for site selection, characterization, and PRB material testing;
$148,000 for design of the PRBs; and $246,000 for the installation of the PRBs
O&M costs were reported as being relatively expensive because of the extensive monitoring performed for the
demonstration compared to full-scale operation. Projected costs for full-scale O&M for a comparable site were
estimated to be $55,000-$60,000 per year
Description:
Fry Canyon, located in southeastern Utah (approximately 60 miles west of Blanding, Utah), is the site of an abandoned
uranium ore milling operation and copper leach operation. From 1957 to 1960, COG Minerals Corporation conducted
uranium upgrading (concentrating) operations at the site, and from 1962 to 1968, the Besinare Company conducted copper
leach operations. Waste from these operation, including tailings, were stored and disposed of at the site. The Utah
Department of Health, Bureaus of Radiation Control and Solid and Hazardous Waste, conducted site visits to Fry Canyon
in 1984 and 1986. Elevated levels of uranium were found in water samples from Fry Creek. The site was selected by the
U.S. Environmental Protection Agency (EPA) in cooperation with the U.S. Geological Survey (USGS), the U.S.
Department of Energy (DOE), BLM, and the Utah Department of Environmental Quality, for a field demonstration of
PRBs to assess their performance in removing uranium from groundwater.
Prior to constructing the PRBs, extensive laboratory investigations were conducted to evaluate the various reactive
materials for each type of PRB and to select the specific reactive materials for the Fry Canyon demonstration. Three types
of PRBs were demonstrated - phosphate (PO4), zero valent iron (ZVI), and amorphous ferric oxyhydroxide (AFO). The
PRBs were constructed side-by-side to allow all three types of materials to be evaluated during the demonstration period.
A funnel and gate design was used and each PRB was keyed into bedrock beneath the colluvial aquifer at the site. After
one year of operation, the ZVI PRB showed the best performance, consistently removing more than 99% of the uranium
from the groundwater. The next best performance was observed for the PO4 PRB. While the removal rate for the PO4
PRB varied throughout the year, decreasing to as low as 62%, as of September 1998, the uranium removal rate for the PO4
PRB at the end of one year of operation was greater than 92%. The AFO PRB initially removed greater than 90% of the
uranium from the groundwater, but dropped to as low as 37% after the first year of operation.
Several problems were encountered during installation of the PRBs. For example, a large bedrock nose was encountered
that caused the PRBs to be rotated such that groundwater entered into the gate structures at an oblique angle rather than
perpendicular, as designed. To prevent this problem for other applications, a more detailed view of the bedrock
topography would be needed during site characterization. Full-scale cost considerations include potential lower costs for
design and operation compared to the demonstration costs, which included three PRBs and a more extensive monitoring
system than would be needed for a non-research application.
141
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Permeable Reactive Wall Remediation of Chlorinated Hydrocarbons in
Groundwater at Moffett Field Superfund Site
Site Name:
Naval Air Station, Moffett Field Superfund Site
Location:
Mountain View, CA
Period of Operation:
April 1996 - December 1997
(Monitoring data available June 1996 through December 1997)
Cleanup Authority:
Installation Restoration Program
Purpose/Significance of Application:
Field demonstration of PRB to remediate groundwater contaminated with
chlorinated solvents
Cleanup Type:
Field demonstration
Contaminants:
Chlorinated Solvents
Groundwater contaminated with chlorinated volatile organic compounds
(CVOCs) including TCE, cis-l,2-DCE, PCE, and 1,1-DCE; TCE is the most
prevalent contaminant at the site
CVOC plume, located in the near surface A aquifer, is more than 10,0000 feet
long and about 5,000 feet wide
TCE and PCE concentrations in the A aquifer reported above 20 mg/L and
0.5 mg/L, respectively
Waste Source:
Wastes from operations and waste
management activities, including leaks
from underground storage tanks,
aboveground tanks, and sumps
Contacts:
Navy Contractor:
Arun Gavaskar
Battelle
505 King Avenue
Columbus, OH 43201
614-424-3403
Navy Contacts:
Charles Reeter
Naval Facilities Engineering Service
Center
1100 23rd Avernue
Port Hueneme, CA 93043
805-982-4991
Stephen Chao
U.S. Navy, EFA West
900 Commodore Drive
San Bruno, CA 94066
Technology:
Permeable Reactive Barrier (PRB)
Funnel-and-gate system; pea gravel added to gate to help distribute
groundwater flow through reactive cell
PRB is 10 feet long (6 feet of reactive material) by 10 feet wide; installed at
depth from +5 feet bgs to -14 feet bgs; keyed into low-permeability sediments
(sand channel)
Reactive material - iron (from Peerless Metal Products, Inc.); -8 to +40 mesh
particle size range
Groundwater monitoring well network includes wells within the PRB as well
as upgradient and downgradient
Type/Quantity of Media Treated:
Groundwater
The aquifer includes two units - Al which is up to 20 feet thick and is
overlain by a clayey surface layer of varying thickness; and A2 which is up to
20 feet thick and extends to 40 feet below mean sea level
Aquifer contains multiple channels of sand and gravel; zone is not laterally
homogenous due to the interbraided channel nature of the sediments
Both units are contaminated; however, the pilot-scale PRB penetrates the Al
unit only
Al unit - hydraulic gradient ranges from 0.005 to 0.009; hydraulic
conductivity ranges from 0.04 foot/day to 633 feet/day (due to lithographic
variation); groundwater velocity ranges from 0.2 to 5.0 feet/day
Regulatory Requirements/Cleanup Goals:
Groundwater cleanup goals are the MCLs for PCE (5 mg/L), TCE (5 mg/L), cis-l,2-DCE (70 mg/L), and vinyl chloride
(2 mg/L), as measured in the effluent from the PRB
142
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Permeable Reactive Wall Remediation of Chlorinated Hydrocarbons in
Groundwater at Moffett Field Superfund Site
Results:
The PRB monitored on a quarterly basis from June 1996 to October 1997 (five quarters total)
By October 1997, TCE, PCE, DCE, and VC were reduced to below the MCLs in the effluent from the PRB
Data from two wells located within the reactive cell (one upgradient; one downgradient) were used to analyze trends in
TCE and DCE degradation:
- TCE concentrations in both wells remained below the MCL every quarter except for June 1996; possible reasons for
the elevated TCE levels in June 1996 included adsorption-desorption on the iron surfaces and residual contamination
from construction activities attributed to the recent installation of the PRB (April 1996)
- DCE concentrations in both wells remained below the MCL for all five quarters
- Over the five quarters, TCE concentrations were relatively constant in both wells
- There was wider variation in DCE concentrations between the two wells; lower DCE concentrations were observed in
the downgradient well, indicating that DCE degraded more slowly than TCE in the reactive medium.
Costs:
The total cost associated with the treatment of groundwater during the pilot-scale PRB demonstration was $802,375,
including $652,375 in capital costs and $150,000 in O&M costs
The projected capital cost for a full-scale PRB at Moffett Field was $4,910,942. O&M costs for a full-scale system
were projected to be $72,278 in annual monitoring costs and $267,538 in barrier maintenance costs, incurred once every
ten years, to replace part of the iron medium
The projected full-scale costs assumed that the PRB would be constructed in two sections - the first section to capture
and treat the groundwater; the second section, constructed downgradient from the leading edge of the plume to control
further migration of the plume; both sections would extend to the base of the A2 aquifer zone, a depth of about 65 feet
Description:
The Naval Air Station, Moffett Field, located in Mountain View California, was selected by the U.S. Navy as part of the
Installation Restoration Program for a field demonstration of a PRB. Groundwater at Moffett Field is contaminated with
chlorinated solvents, and the site was placed on the National Priorities List in 1987. An area known as the West Side
Plume, a chlorinated solvent plume (primarily TCE) located on the west side of Moffett Field, was used for the
demonstration. Based on the results of laboratory testing, iron from Peerless Metal Powders was selected for the PRB.
The pilot-scale PRB, installed in April 1996, was a funnel-and-gate design, keyed into low-permeability sediments. The
PRB was operated through October 1997, with groundwater monitored quarterly from June 1996 through October 1997
(five quarters total). By October 1997, TCE, PCE, DCE, and VC were reduced to below the cleanup goals in the effluent
from the PRB. Additional data for TCE and DCE collected from wells located within the reactive cell showed that TCE
and DCE concentrations within the PRB were generally below the MCLs, and that DCE degraded more slowly in the
reactive cell than TCE. The projected cost for a full-scale PRB at Moffett Field was $4,910,942 in capital costs and
$72,278 in annual monitoring costs. In addition, the projected O&M costs included $267,538 in barrier maintenance costs
for iron medium replacement, incurred once every ten years.
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Groundwater Extraction and a Permeable Reactive Treatment Cell at Tacony
Warehouse, Philadelphia, Pennsylvania
Site Name:
Tacony Warehouse (TW)
Location:
Philadelphia, Pennsylvania
Period of Operation:
May 13, 1998 through 2001 (projected)
Cleanup Authority:
CERCLA and State
Record of Decision (ROD) signed on
July 21, 1995
Purpose/Significance of Application:
This project demonstrates that an extraction well that is surrounded by permeable
reactive media (iron filings) is a viable treatment alternative at sites contaminated
with chlorinated solvents.
Cleanup Type:
Full scale
Contaminants:
Organic Compounds
Volatiles (halogenated)
Maximum concentrations: 4,214 mg/L PCE, 579 mg/L TCE,
2,800 mg/L cis-l,2-DCE, 64.6 mg/L trans-1,2-DCE, 2,000 mg/L vinyl chloride
Waste Source:
The source of chlorinated solvents in
the groundwater is not known.
Contacts:
Project Management:
Russ Marsh
USACE, Baltimore District
10 S. Howard Street
Baltimore, MD 21201
(410) 962-2227
russell.e.marsh@nab02.usace.army.mil
Vendor:
Bob Manzitti
Radian International
7101 Wisconsin Ave., Suite 700
Bethesda, MD 20814
(301) 280-2601
bob_manzitti@radian.com
Regulatory Points of Contact:
Mark Stephens
US EPA, Region 3
1650 Arch Street
Philadelphia, PA 19103-2029
(215) 814-3353
stephens.mark@epamail.epa.gov
Christopher Falker
PADEP
Lee Park Suite 6010
555 North Lane
Conshohocken, PA 19428
(610) 832-5930
Technology:
Pump and treat using a permeable reactive treatment cell
Three extraction wells are being used to remove groundwater at the site. The
system extracts an average of 3 gallons per minute
The Tacony Treatment Cell or TTC is located near the monitoring well with
the highest VOC concentrations (MW-9). The TTC is four feet in diameter
and is filled with 22 tons of zero-valent iron filings around a four-inch
diameter extraction well. The thickness of the iron filings layer was
calculated to provide a 10 hour detention time
Zero-valent iron reacts with the chlorinated hydrocarbons to form less-
chlorinated and non-chlorinated hydrocarbons
EW-1 and EW-2 are six-inch extraction wells with no reactive media. They
were located to influence the hydraulic capture zone
Extracted groundwater is discharged to the City of Philadelphia sanitary sewer
system
Type/Quantity of Media Treated:
Before treatment began, an area in the vicinity of MW-9 was contaminated in
addition to an area approximately 300 feet downgradient of MW-19
During the first year of operation, approximately 1.8 million gallons were
extracted from the aquifer beneath the site, of which 393,165 gallons were
treated by the TTC
The contaminated aquifer is between 8 and 35 feet below ground surface
(bgs). The aquifer can be described as heterogeneous and anisotropic, with
hydraulic conductivities ranging from 2.3 to 29.4 gal/day/ft2
Regulatory Requirements/Cleanup Goals:
PADEP established the groundwater remediation goal of achieving background levels, which are based on the analytical
quantitation limits of EPA SW-846 Test Method 8240. The remediation targets are 5 mg/L for PCE, TCE, and DCE
and 10 mg/L for vinyl chloride
The City of Philadelphia does not allow water to be discharged to the sewer system at concentrations exceeding 2.13
mg/L of total toxic organics
144
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Groundwater Extraction and a Permeable Reactive Treatment Cell at Tacony
Warehouse, Philadelphia, Pennsylvania
Results:
The TTC is demonstrating conversion of PCE and TCE to less-chlorinated hydrocarbons when compared to untreated
groundwater at MW-9, which is located approximately 15 feet away. PCE and TCE were not detected at the TTC,
however, intermediate reaction products (cis-l,2-DCE and vinyl chloride) were observed
Three of the six target monitoring wells are meeting the remedial standards and a fourth well met the standards in April
1999 but exceeded these levels in June 1999
The sewer discharge meets the City of Philadelphia limit on total toxic organics
Costs:
The total project cost was $607,336, which includes the capital costs ($416,777), one year of operation and maintenance
($16,880), and other related costs ($132,417)
Description:
The TW site is located on 14.2 acres of land adjacent to the Delaware River in northeast Philadelphia. The site was
constructed and established as an armor plate assembly facility in 1943. The site was used for warehousing operations
from the 1950s through 1992, when the site was vacated. During this time, there were several periods of inactivity and
numerous changes in accountability for the site.
Site investigations at the TW site indicate that the groundwater in several areas is contaminated with chlorinated solvents
and that soil contamination around MW-9 may be a potential ongoing source of contamination. Use of barriers
constructed from zero-valent iron has been demonstrated to be an effective treatment method at other sites contaminated
with chlorinates solvents. At TW, groundwater in the vicinity of MW-9 is drawn through a bed of iron filings surrounding
an extraction well. As the groundwater passes through the bed, it is treated through reductive dehalogenation reactions.
The treated water is combined with untreated groundwater from two other on-site extraction wells and is discharged to the
city sanitary sewer.
Results from the first year of operation indicate that reductive dehalogenation reactions are occurring, but not to
completion. Permeable reactive extraction wells are applicable for many sites, especially where contamination is migrating
off-site. In these cases, the hydraulic control provided by pumping may be necessary or the installation of an interceptor
wall may not be feasible.
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146
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DEBRIS/SOLID MEDIA TREATMENT ABSTRACTS
147
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Direct Chemical Oxidation at Lawrence Livermore National Laboratory
Livermore, California
Site Name:
Lawrence Livermore National Laboratory (LLNL)
Location:
Livermore, California
Period of Operation:
Not identified
Cleanup Authority:
Not identified
Purpose/Significance of Application:
Pilot-scale demonstration of the DCO process to treat a variety of organic
aqueous waste streams
Cleanup Type:
Field demonstration
Contaminants:
Chlorinated solvents, PCBs, kerosene, explosives, ion exchange resins
Solvents - TCE, PCE, methylene chloride, chloroform
2,4,6-TNT, triethylamine, ethylene gylcol
Waste Source:
LLNL waste streams or surrogates
containing chlorinated solvents
Contacts:
Product Line Manager:
Vince Maio, Advisory Engineer
Mixed Waste Focus Area
Lockheed Martin Idaho Technologies
Company
Idaho National Engineering and
Environmental Laboratory
P.O. Box 1625
Idaho Falls, ID 83415
Telephone: 208-526-3696
Fax: 208-526-1061
E-mail: vmaio@inel.gov
Principal Investigator:
Dr. John Cooper
Chemistry and Materials Science
Directorate, L-352
LLNL
P.O. Box 808
Livermore, CA 94550
Telephone: 925-423-6649
Fax: 925-422-0049
E-mail: cooper3@llnl.gov
Technology:
Direct Chemical Oxidation (DCO)
Nonthermal, low temperature, ambient pressure, aqueous-based technology
used to oxidize organic compounds in hazardous and mixed waste streams to
carbon dioxide and water
Oxidizing agent - sodium or ammonium peroxydisulfide
Five continuously stirred tank reactors (CSTRs) - pretreatment, feed, and
three-stage oxidizer (15L each)
Hydrolysis used a pretreatment step for highly volatile wastes - for
demonstration, hydrolysis used in tests of PCB waste streams only
Operating temperature - hydrolysis - < 150 ฐ C; oxidation - 90 ฐ C
Oxidation rate - about 200-kg (as carbon) per cubic meter of reactor per day
Tests conducted on several types of waste streams including concentrated
waste streams (2,4,6-TNT, kerosene, triethlyamine, Dowex - an ion exchange
resin, ethylene glycol), kerosene(predominately dodecane), chlorinated
solvents (PCE, TCE, methylene chloride, chloroform and a mix of PCE and
chloroform), and low concentrations (45 ppm) of PCBs
The tests included oxidation and destruction rates for concentrated waste
streams; oxidation time profile for kerosene; oxidation of chlorinated solvents
without hydrolysis pretreatment; and treatment of PCB waste both with and
without hydrolysis pretreatment
Type/Quantity of Media Treated:
Waste streams from LLNL operations
Regulatory Requirements/Cleanup Goals:
The purpose of the demonstration was to evaluate the DCO process on a variety of organic waste streams, including
concentrated waste streams, under varying conditions
No specific goals were established for the demonstration
148
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Direct Chemical Oxidation at Lawrence Livermore National Laboratory
Livermore, California
Results:
Concentrated waste streams - the oxidation rate (based on Ka of 0.02-0.04 min' and input concentration of 5N oxidant)
and the destruction rate were calculated for the concentrated waste streams; the oxidation rate was considered to be a
rough estimate for CSTR scaling; oxidation rates ranged from 132 kg/m3/day (TNT and Dowex) to 432 kg/mVday
(ethylene glycol); destruction rates ranged from >98.8 (TNT and triethylamine) to >99.97% (kerosene)
Kerosene- the oxidation rate profile showed a rapid destruction of kerosene following the addition of the oxidant at
90ฐC - 99.97% within the first 70 minutes, followed by a slower destruction rate during the reminder of the test, with a
destruction rate of 99.99% after 140 minutes
Chlorinated solvents - results showed that chlorinated solvents are readily oxidized by the process, without pretreatment.
Data reported on the extent of oxidation after 1 hr ranged from 0.967 to 0.996; however, the pretreatment step avoids
the need to pressurize the oxidation step to avoid entrainment of the volatile solvents in the CO2 offgas
PCBs - results showed that very dilute solutions of PCBs can be treated to below detection limits by the process, both
with and without pretreatment; little difference was observed with and without pretreatment; pretreatment was
determined not to be necessary since PCBs are not volatile
Costs:
Projected costs for a full-scale DCO process were calculated for a 50 kg/day plant operating at an 80% capacity factor;
costs were estimated for two scenarios - recycling the expended oxident and not recycling
If recycled, the projected cost is $9.88/kg of carbon in the waste, including the cost of electrical energy ($2.63), labor
($3), and capital cost ($1.92) plus profit and G&A (30%)
If not recycled, the projected cost is $79/kg of carbon in the waste based on the equivalent weights of sodium
peroxydisulfate (119 g/equivalent) and carbon (3 g/equivalent), a bulk cost for sodium peroxydisulfate ($0.73/lb), and
an assumed 80% stoichiometric efficiency
Description:
In 1992, researchers at LLNL began developing the DCO process, a nonthermal, low temperature, aqueous based
technology, for use in mixed waste treatment, chemical demilitarization and decontamination, and environmental
remediation. A pilot-scale demonstration of the DCO process was conducted on a number of waste streams including
concentrated wastes such as TNT, kerosene, triethlyamine, ion exchange resins, and ethylene glycol; chlorinated solvents
such as TCE, PCE, methylene chloride, and chloroform; and low concentrations of PCBs in solution. The pilot-scale DCO
process included a pretreatment (hydrolysis) step, used for highly chlorinated volatiles and a three-stage oxidation process
performed in 15L reactors.
The results of the pilot-scale testing showed that the DCO process can treat a variety of organic waste streams. The
destruction rate for the concentrated wastes was >98%, chlorinated solvents were readily oxidized using the three-stage
oxidation only (without hydrolysis), and concentrations of PCBs were reduced to below detection levels both with and
without pretreatment. According to LLNL, further research is not needed before scale-up of the technology, however,
treatability studies are recommended for each candidate waste stream. Considerations in selecting DCO to treat a waste
stream include the matrix and physical properties of the waste, waste composition and characteristics, and the target degree
of oxidation/destruction removal efficiency.
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Acid Digestion of Organic Waste at Savannah River Site, Aiken, South Carolina
Site Name:
Savannah River Site
Period of Operation:
1996 to 1997
Purpose/Significance of Application:
Demonstrate acid digestion of organic wastes as an alternative to incineration
Contaminants:
Organic wastes and simulated radioactive wastes; no specific contaminants
identified
Contacts:
Principal Investigator:
Robert A. Pierce
Westinghouse Savannah River Co.
P.O. Box 616, Bldg. 773A, Rm. C-137
Aiken, SC 29802
Telephone: (803) 725-3099
E-mail: robert.pierce@srs.gov
DOE Contact:
William Owca
U.S. DOE Idaho Operations Office
850 Energy Drive
Idaho Falls, ID 83401-1563
Telephone: (208) 526-1983
Fax: (208) 526-5964
E-mail: owcawa@id.doe.gov
Location:
Aiken, South Carolina
Cleanup Authority:
Not identified
Cleanup Type:
Bench and pilot scale
Waste Source:
Nuclear processing operations
Technology:
Acid Digestion Process
Process consists of an oxidation vessel, acid recycle and offgas treatment
system, and acid stabilization and waste immobilization system
Organic destruction takes place in oxidation vessel; waste is added to a bath
of 14. 8M phosphoric acid containing 0.5 to l.OM nitric acid
The vessel is heated to 150 to 200ฐC under pressure of 0 to 20 psig
Bench-scale tests were conducted in units with 2-5 L capacity and pilot-scale
tests in a 40 L glass reactor
Type/Quantity of Media Treated:
Organic wastes
Cellulose (240 gms of KimWipes),
neoprene, polyethylene, and PVC
Regulatory Requirements/Cleanup Goals:
Determine applicable organic wastes for technology, and related operating conditions
No specific cleanup goals were identified
Results:
Tests were conducted on cellulose, neoprene, polyethylene, and PVC
Tests on cellulose showed that 240 gms of KimWipes were oxidized to CO2 and H2O in 70 mL of acid and residual
phosphoric acid was stabilized, providing for a volume reduction of 50 to 100 fold
Tests showed that dissolution time for organic wastes depends on the type of waste, temperature, pressure, and acid
concentration
The dissolution rate for mixtures of waste types will be limited by the PVC dissolution rate, even when PVC is present
in small quantities
Costs:
Projected costs for full-scale acid digestion systems are under preparation, but were estimated to range from $2,000,000
to $8,000,000 for design, construction, and demonstration
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Acid Digestion of Organic Waste at Savannah River Site, Aiken, South Carolina
Description:
Bench- and pilot-scale tests of an Acid Digestion system were conducted at DOE's Savannah River Site in 1996 and 1997.
This technology was tested using job control wastes - organic waste forms consisting of materials such as cellulose,
neoprene, polyethylene, and PVC. Acid Digestion is one of several Alternative Oxidation Technologies (AOT) under
consideration by SRS for treatment of their plutonium 238 contaminated job control wastes.
Acid Digestion consists of dissolution of organic materials in a solution of nitric acid in phosphoric acid, and is conducted
at operating conditions of 150 to 200ฐC and 0 to 20 psig. Tests were conducted on cellulose, neoprene, polyethylene, and
PVC, and showed that dissolution time for organic wastes depended on the type of waste, temperature, pressure, and acid
concentration. Further, tests showed that the dissolution rate for mixtures of waste types will be limited by the PVC
dissolution rate, even when PVC is present in small quantities. Because the process involves the use of nitric acid,
controlling the reaction is an important safety consideration. Issues associated with monitoring the oxidation rate and
water content need to be resolved for full-scale deployment of the technology.
151
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Remotely Operated Scabbling at Argonne National Laboratory-East
Argonne, Illinois
Site Name:
Argonne National Laboratory-East
Location:
Argonne, Illinois
Period of Operation:
Not identified
Cleanup Authority:
Not identified
Purpose/Significance of Application:
Demonstration of a remotely-operated scabbier to decontaminate radioactive
concrete flooring
Cleanup Type:
Field demonstration
Contaminants:
Radionuclides
Beta/gamma radiation
Waste Source:
Nuclear processing operations
Contacts:
Technical Contacts:
Linda Lukart-Ewansil
Pentek, Inc
412-262-0725
pentekusa@aol.com
Susan Madaris
Florida International University
305-348-3727
madariss@eng.flu.edu
DOE Contact:
Richard Baker
DOE, Chicago Operations Office
630-252-2647
richard.baker@ch. doe. gov
Technology:
Remotely-Operated Scabbier
Pentek, Inc. Mooseฎ scabbier
Consists of three subsystems - scabbling head assembly, on-board, high-
efficiency paniculate (HEPA) vacuum system, and six-wheeler chassis;
remote operation performed using a small control panel attached to the
scabbier by a tether (50-ft used for demonstration)
Scabbling head - seven 2 1/4-in diameter reciprocating scabbling bits, each
with a 9-point tungsten carbide-tip capable of delivering 1,200 hammer
impacts/min
HEPA vacuum system - two-stage positive filtration system that deposits
waste into an on-board 23-gal drum
Chassis - independent skid steering for 360-degree rotation
During demonstration - average rate of scabbling - 130ft2/hr for a 2-person
crew
Type/Quantity of Media Treated:
Debris (concrete floor)
Regulatory Requirements/Cleanup Goals:
The objectives of the demonstration were to evaluate the remotely-operated scabbier for concrete flooring contaminated
with beta/gamma radiation
Results:
During the demonstration, the scabbier removed an average of 1/8-inch concrete from 620ft2 of the concrete floor
Contamination levels (total beta/gamma radiation) reduced from a maximum of 105,000 dpm/100 cm2 to 3,500 dpm/100
cm2
Waste generated - 37ft3 mix of powder and small chips of paint and concrete
Costs:
Costs for the Pentek Mooseฎ - $165,000 equipment cost; $l,995/day labor rate (two trained operators); and $2,400 for
replacement parts
For the cost analysis, the Pentek Mooseฎ was compared to a baseline technology of manual scabbling, using the
demonstration area (620ft2) and a hypothetical job size of 2,500 ft2 (area requiring one week of effort)
The Pentek Mooseฎ was more expensive than the baseline technology for the smaller area; but was comparable to the
baseline technology for the larger area
The report includes a detailed analysis of the effect of labor rates, equipment transportation costs, waste disposal costs,
and other factors on the cost of the technology
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Remotely Operated Scabbling at Argonne National Laboratory-East
Argonne, Illinois
Description:
The Pentek Mooseฎ is a remotely-operated scabbier used to scarify concrete floors and slabs. A demonstration of the
technology was conducted at the Argonne National Laboratory-East, CP-5 Reactor on a floor area (620ft2) contaminated
with beta/gamma radiation. The Mooseฎ includes a head assembly, on-board, high-efficiency paniculate (HEPA) vacuum
system, and six-wheeler chassis. The scabbier is operated remotely using a small control panel attached to the scabbier by
a tether, 50 to 300 ft in length. A 50-ft tether was used for the demonstration.
A two-person crew, one person to operate the scabbier and one to manage hoses and cords, removed an average of 1/8 in
concrete from an area of 620ft2 or at a rate of 130ft2/hr. Total beta/gamma radiation levels were reduced from a maximum
of 105,000 dpm/100 cm2 to 3,500 dpm/100 cm2 following the demonstration. Approximately 37ft3 of waste was generated
by the scabbling, consisting of a mixture of powder and small pieces of paint chips and concrete. The cost analysis showed
that a number of factors affect the cost of the remotely-operated scabbier compared to the baseline of manual scabbling,
including labor rates, costs to transport equipment, and waste disposal. The system is commercially available; however,
several design improvements were suggested based on the results of the demonstration including eliminating the need for a
second operator, increasing the size of the waste drum from 23-gal to 55-gal, and adding a second vacuum connection to
the rear of the unit to collect small pieces of debris.
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Soft Media Blasting at the Fernald Site, Fernald, Ohio
Site Name:
Fernald Site
Location:
Fernald, OH
Period of Operation:
August 19 - September 5, 1996
Cleanup Authority:
Not identified
Purpose/Significance of Application:
Demonstration of soft blast media to clean surfaces contaminated with uranium
Cleanup Type:
Field demonstration
Contaminants:
Radionuclides
Enriched uranium (1.34 wt-%U-235)
Contaminant levels of 18,000 dpm/100 cm2 measured prior to demonstration
Waste Source:
Residue from enriched uranium
processing operations
Contacts:
Vendor Contact:
Edward Damien
AEA Technologies, Inc.
13245 Reese Blvd, #100
Huntsville, NC 28078
704-875-9573
Technical Contacts:
Larry Stebbins
Fluor Daniel Fernald
513-648-4785
larry.stebbins@fernald.gov
Steve Bossart
Federal Energy Technology Center
304-285-4643
sbossa@fetc.doe.gov
Technology:
Soft Media Blasting
Compressed air is used to propel soft blast media through a hose onto the
contaminated surface; soft media traps and absorbs contaminants on impact
Air compressor - minimum requirements (250 ftVmin of air; 120 psi line
pressure at the feed unit); for demonstration- 375 ftVmin, 150 psi
Feed unit - contains media mixture; connected to a hose (1 1/4-in. diameter;
25-ft long) fitted with a venturi-style tungsten carbide blast nozzle (3/8 in and
1/2 in nozzles tested during demonstration)
Blast pressure - 45 psi; media flow - 20-25 Ibs
Six grades of media available (color-coded by grade); two grades of media
were tested - green media containing no abrasive; brown media containing
Starblastฎ abrasive
Demonstration involved cleaning a settling tank contaminated with enriched
uranium process residue
Type/Quantity of Media Treated:
Debris (concrete)
Regulatory Requirements/Cleanup Goals:
Performance objectives included cleaning effectiveness (based on amount of residual radioactivity) and production rate
Evaluate the technology for use in cleaning radioactive-contaminated surfaces
Results:
Radiation levels were below the minimum detectable count rate (MDCR) following the demonstration
Production rate was 92 ftVhr; rate was slower than expected - worker time was limited to 1 hr/day because of the noise
generated by the system (106 to 113 dB)
Brown media was effective on thick dirt; brown media generated more dust than the green media
Costs:
Demonstration cost for soft media blasting - $4.60/ft2
Projected full-scale costs are comparable to baseline technology (high-pressure water washing) for an area of 900ft2 or
larger
154
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Soft Media Blasting at the Fernald Site, Fernald, Ohio
Description:
A field demonstration of Soft Media Blasting Technology (SMBT) was performed at the Fernald Site to evaluate the
capability of the technology for cleaning radioactively-contaminated surfaces. SMBT uses compressed air to propel soft
blast media onto the contaminated surface, with the soft media trapping and absorbing contaminants on impact. Six grades
of media are available for the SMBT, manufactured by AEA Technologies, Inc. For the demonstration, two grades were
tested - one containing no abrasive and one containing the Starblastฎ abrasive. A settling tank contaminated with enriched
uranium process residue was used for the demonstration.
The results of the demonstration showed that the SMBT reduced radiation levels from 18,000 dpm/100 cm2 to MDCR.
The production rate of 92 ft2/hr was slower than the baseline technology of high-pressure washing. Because the system
was noisy, the time an individual could work was limited. The demonstration cost for soft media blasting was $4.60/ft2,
more expensive than the baseline technology. However, the projected full-scale costs for SMBT are comparable to the
baseline technology for an area of 900ft2 or larger. Issues associated with full-scale implementation include the noise level
produced by the system and improving the ergonomic design of the nozzle/hose assembly to make it less awkward to use.
While the media was not recycled during the demonstration, a unit (Classifier Unit) can be added to the system for this
purpose. The decision to not recycle the media during the demonstration was based on a concern that the feed and
classifier units would not be successfully decontaminated following repeated recycling of the contaminated media.
155
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Concrete Grinder at the Hanford Site, Richland, Washington
Site Name:
Hanford Site
Location:
Richland, WA
Period of Operation:
November 1997
Cleanup Authority:
Not identified
Purpose/Significance of Application:
Demonstration of a light weight hand-held grinder to decontaminate radioactive
concrete surfaces
Cleanup Type:
Field demonstration
Contaminants:
Radionuclides
Beta/gamma radiation
Waste Source:
Operation of a nuclear research reactor
Contacts:
Technical Contacts:
Stephen Pulsford, BHI, 509-373-1769
Greg Gervais, USAGE, 206-764-6837
DOE Contacts:
JohnDuda, FETC, 304-285-4217
Jeff Bruggeman, DOE-RL, 509-376-7121
Technology:
Concrete Grinding
Flex Model LD 1509 FR hand-held concrete grinder (6 Ibs)
5-in diamond grinding wheel (10,000 rpm)
1.25-in. vacuum port for dust extraction
Powered by 110 VAC, 11 amps
Type/Quantity of Media Treated:
Debris (concrete) - 54ft2
Regulatory Requirements/Cleanup Goals:
The objectives of the demonstration were to evaluate the capability of a light weight, hand-held grinder in removing
concrete
Results:
Removed concrete from 54ft2 of walls and floors in the demonstration area to a depth of 1/16 in. at a rate of 48ft2/hr
Contamination levels following demonstration were below free-release levels
Costs:
The costs for the Flex LD 1509 FR concrete grinder are - $649 equipment cost plus $205 for a replacement diamond
grinding wheel; grinder can be rented for $25/day or $75/week
The cost for the hand-held grinder were 40% less than the baseline technologies (scalier and scabbier)
Description:
The Flex concrete grinder is a lightweight, hand-held unit used to remove concrete and coatings from concrete surfaces.
The electric powered grinder is equipped with a diamond grinding wheel and a vacuum port for dust extraction. The
grinder was demonstrated on walls and flooring at the C reactor that were contaminated with beta/gamma radiation.
During the demonstration, the grinder removed concrete to a depth of 1/16 in from a total area of 54ft2. At the end of the
demonstration, radioactivity levels were below free-release levels. The Flex grinder was compared to two baseline
technologies - scabbier and sealer. The Flex grinder was found to be easier to use, more flexible, and more efficient that
the baseline technologies, and overall to cost about 40% less. However, the life of the grinding wheel (manufacturer
recommended change after 500ft2 at a depth of 1/16 in and the cost of a replacement wheel ($205) should be factored into
the decision to use the technology. No specific changes or modifications to the grinder are needed for full-scale
deployment.
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157
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Concrete Shaver at the Hanford Site, Richland, Washington
Site Name:
Hanford Site
Location:
Richland, WA
Period of Operation:
November 1997
Cleanup Authority:
Not identified
Purpose/Significance of Application:
Demonstration of a concrete shaver to decontaminate radioactive concrete
surfaces
Cleanup Type:
Field demonstration
Contaminants:
Radionuclides
Beta/gamma radiation
Waste Source:
Operation of a nuclear research reactor
Contacts:
Vendor Contact:
Ian Bannister
Marcrist Industries Limited
+44 (0) 1302 890888
Technical Contacts:
Stephen Pulsford, BHI, 509-373-1769
Greg Gervais, USAGE, 206-764-6837
DOE Contacts:
JohnDuda, FETC, 304-285-4217
Glenn Richardson, DOE-RL, 509-376-
7121
Technology:
Concrete Shaver
Marcrist Industries Limited Model DTF25 concrete shaver
Electric-powered, serf-propelled, walk behind concrete and coating removal
system
10-in. wide diamond impregnated shaving drum with 5-in. blades; vacuum
port for dust extraction
Weighs 330 Ibs; requires 380-480 volt, 3-phase power; minimum 16 amps
Variable cutting depth up to 0.5 in.; can reach to within 3 in. of wall/floor
interface or obstruction
Demonstrated on radioactive-contaminated concrete floor
Type/Quantity of Media Treated:
Debris (concrete)
Regulatory Requirements/Cleanup Goals:
The objectives of the demonstration were to evaluate the capability of the shaver in removing contaminated concrete
surfaces
Results
Removed concrete from 816 ft2 of floor space in the demonstration area to a depth of 1/8 in. at a rate of 128 ftVhr
Contamination levels following demonstration were below free-release levels:
Costs:
The costs for the Marcrist Industries Limited Model DTF25 concrete shaver are - $10,700 equipment cost plus $7,161
for a set of replacement blades (100 blades)
Unit cost of $ 1.32/ft2, assuming a rate of 128 ftVhr
The cost for the shaver is 50% less than the baseline technology (scabbier)
Description:
The Marcrist Industries Limited Model DTF25 concrete shaver is an electric-powered, serf-propelled, walk behind system
used to remove concrete and coatings from concrete surfaces. The electric powered shaver is equipped with a diamond
impregnated shaving drum and a vacuum port for dust extraction. The shaver was demonstrated on concrete flooring in
two rooms at the C reactor that were contaminated with beta/gamma radiation.
During the demonstration, the shaver removed concrete to a depth of 1/8 in from a total area of 816ft2. At the end of the
demonstration, radioactivity levels were reported to be below free-release levels. The shaver was compared to the baseline
technology - scabbier - and was found to be as much as five times faster, produce less worker fatigue, and save 50%
compared to the baseline technology. The shaver requires the use of a HEP A filtration system and is designed to work on
floors, but not walls. No specific changes or modifications to the shaver are needed for full-scale deployment.
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159
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Concrete Spaller Demonstration at the Hanford Site, Richland, Washington
Site Name:
Hanford Site
Location:
Richland, WA
Period of Operation:
January 16 - 27, 1998
Cleanup Authority:
Not identified
Purpose/Significance of Application:
First demonstration of the hand-held concrete spaller on contaminated surfaces
Cleanup Type:
Field demonstration
Contaminants:
Radionuclides
Beta and gamma radioactivty
Waste Source:
Nuclear processing operations
Contacts:
Technical Contacts:
Stephen Pulsford, BHU, 509-375-
4640
Mark Mitchell, PNNL, 509-372-4069
Gregory Gervais, USAGE, 206-764-
6837
DOE Contacts:
Glenn Richardson, 509-372-9629
Shannon Saget, 509-372-4029
Technology:
Concrete Spaller
Hand-held unit weighing about 30 Ibs
Components include spalling bit, removable metal shroud, hydraulic cylinder
rated at 9 tons, and hydraulic pump rated at 10,000 psi
Pre-drill holes in surface (2.5-cm diameter) in a honeycomb pattern
Spaller bit inserted into hole, the hydraulic valve opened causing bit to
expand and breaking off a chunk of concrete; concrete chunks were collected
in the metal shroud
A water spray was used to control dust emissions during the demonstration
Type/Quantity of Media Treated:
Debris - 4.6m2
Contaminated concrete walls and floors
Regulatory Requirements/Cleanup Goals:
The objectives of the demonstration were to evaluate the capabilities and design features of the concrete spaller for
removing contaminated concrete surfaces
No specific cleanup goals were identified
Results:
During the demonstration, the concrete spaller removed concrete from an area of 4.6 m2 to a depth of 3 mm to 50 mm;
the removal rate was 1.3m2/hr
Pre-drilling was relatively slow; however, faster drills are available for this step
Little dust was generated by the spaller
Costs:
Operating costs for the demonstration were about 22% higher than the baseline technology (scabbier and sealer) because
of the problems encountered with the drill (slower than expected and inexperienced crew)
For the cost analysis, operating costs were estimated for an improved concrete spaller technology (adequate drill and
experienced crew) - $128/m2, assuming a depth of 3-mm
Operating costs for the improved spaller are 15% less the costs for the baseline tools (sealer at $155/nf and scabbier at
$156/m2)
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Concrete Spaller Demonstration at the Hanford Site, Richland, Washington
Description:
The concrete spaller, developed by the Pacific Northwest National Laboratory, is a hand-held tool used for
decontaminating concrete surfaces. The spaller includes a 9-ton hydraulic cylinder and a patented spalling bit that is run
by a 10,000 psi hydraulic pump. Holes are drilled into the concrete in a honeycomb pattern and the spaller bit inserted into
each hole. The hydraulic valve is opened, expanding the bit, and the concrete is removed in chunks up to 2 inches thick
and collected in a metal shroud attached to the spaller. The unit can be used on flat or slightly curved concrete walls and
floors, and can be equipped with a vacuum filtration unit for paniculate control.
The concrete spaller was demonstrated at DOE's Hanford site in Richland, WA on two wall areas in the fan room of the C
Reactor facility. The walls were contaminated with beta/gamma radioactivity. During the demonstration, the spaller
removed 4.6 m2 of contaminated surface to a depth of 3 mm to 50 mm, which was deeper than the baseline technologies
(sealer and scabbier). The operating cost of the spaller under optimal conditions is $128/m2, which is less than the costs
for the baseline tools (sealer at $155/nf and scabbier at $156/m2). Considerations for future development and use of the
technology include the need for a simplified design or manufacturing technique for the spalling bit (which was found to be
fairly difficult to manufacture), the addition of a water spray nozzle to the drill to eliminate the need for a second worker to
manually apply water during drilling, and the additional of an automatic hydraulic control valve.
161
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Stabilization Using Phosphate Bonded Ceramics at Argonne National Laboratory,
Argonne, Illinois
Site Name:
Argonne National Laboratory
Location:
Argonne, IL
Period of Operation:
Not identified
Cleanup Authority:
RCRA and NRC
Purpose/Significance of Application:
Demonstration of phosphate-bonded ceramics to stabilize a variety of high salt-
containing wastes
Cleanup Type:
Development tests
Contaminants:
Metals
Oxide forms of cadmium, chromium, lead, mercury, and nickel were added to
the waste stream at concentrations of 1,000 mg/kg each
Waste Source:
Surrogate waste streams containing
high levels of nitrate salts and chloride
and sulfates similar to those found at
DOE facilities
Contacts:
Principal Investigator:
Arun S. Wagh, Ph.D.
Argonne National Laboratory
9700 South Case Ave
Argonne, IL 60439
Telephone: 630-252-4295
Fax: 630-252-3604
E-mail: arunwagh@gmgate.anl.gov
MWFA Product Line Manager:
Vince Maio, Advisory Engineer
Mixed Waste Focus Area
Lockheed Martin Idaho Technologies
Company
Idaho National Engineering and
Environmental Laboratory
P.O. Box 1625
Idaho Falls, ID 83415
Telephone: 208-526-3696
Fax: 208-526-1061
E-mail: vmaio@inel.gov
Technology:
Stabilization using phosphate bonded ceramics
50/50 blend of magnesium oxide and monopotassium phosphate powder
mixed with water, additives, and waste
Mixed for 20-30 minutes; waste form set for 2 hours, then cured for 14 days
Initial testing performed to determine effects of different test scenarios on
waste forms conducted on surrogate salt solutions and on surrogate salt waste
streams containing activated carbon and ion exchange resins
- Salt solutions - saturated solutions of NaNO3 (50-wt%) and NaCl (10-
wt%); RCRA metals (Cd, Cr, Pb, and Hg) added at 5,000 mg/kg each;
additives included 50-wt% Class-F fly ash and l-wt% K2S to tie up Hg
- Salt waste streams with activated carbon and ion exchange resins - mix
included nitrate, sulfate, and chloride salts (30%), Na2CO3, and CsCl (to
simulate a radioactive component)
Based on results, additional tests were performed on two salt surrogates - one
containing a high quantity of nitrate salts (58-wt%); the other high quantities
of chloride and sulfates (70-wt%); RCRA metals (Cd, Cr, Pb, Hg, and Ni)
added at 1,000 mg/kg each;
Waste forms tested for density, compressive strength, and flammability
(nitrate wastes)
Type/Quantity of Media Treated:
Salt-containing waste streams
Regulatory Requirements/Cleanup Goals:
RCRA Land Disposal Restriction (LDR) standards and NRC guidelines
Universal Treatment Standards (UTS) for metals
NRC leach index of 6; compressive strength of 500 psi
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Stabilization Using Phosphate Bonded Ceramics at Argonne National Laboratory,
Argonne, Illinois
Results:
Waste forms from salt solutions of NaNO3 (50-wt%) and NaCL (10-wt%):
Densities of 1.8 g/cm3 and 1.72 g/cm3, respectively and compressive strengths of 1,800 psi and 3,500 psi, respectively
Passed the UTS standards for metals, with the exception of Cd; attributed to the less acidic conditions of the test (pH 4)
that slowed reaction of Cd with the phosphate; Cd was fully stabilized in subsequent tests at lower pH levels
Marginally passed leach index criteria with leach levels of 6.86 and 6.7, respectively, indicating slow salt leaching;
additional binding or coating techniques may be needed to prevent salt leaching from deteriorating the waste
Waste forms from salt solutions containing activated carbon and ion exchange resins:
For the 60-wt% and 70-wt% loadings - had densities of 1.24 g/ml and 1.32 g/ml and compressive strengths of 2,224 psi
and 5,809 psi, respectively
Passed the UTS standards for metals
MWFA salt surrogates:
Had densities in the range of 1.7-2.0 g/cm3 and compressive strength in the range of 1,400-1,900 psi
Passed the UTS standards for metals
Leach index results showed that process was only marginally successful in retaining NO3 and CL anions; modifications
to the basic formulation for the process were made including adding fly ash to the binder and a polymer coating to the
waste form, which increased the leach index to as high as 12.6
Costs:
Projected cost for full-scale stabilization using phosphate bonded ceramics are capital costs of about $2 million,
including equipment design and development, and operating costs of about $6,510 per cubic meter of waste form,
including labor and materials; disposal costs are estimated to be $2,836 per cubic meter of waste
Compared to the baseline technology (basic Portland cement), the operating costs are higher ($6,510 versus $4,300 per
cubic meter of waste form), but the disposal costs are lower ($2,836 versus $3,700 per cubic meter of waste)
Description:
A series of development tests were conducted at the Argonne National Laboratory to validate the stabilization of salt-
containing wastes using a patented chemically bonded phosphate ceramics (CBPC) process. The low-temperature process
uses magnesium oxide and monopotassium phosphate to form a low porosity, dense waste form consisting mainly of a
ceramic magnesium potassium phosphate barrier. Various tests were performed using a number of mixed waste surrogates,
including saturated salt solutions, salt surrogate containing activated carbon and ion exchange resin, and two MWFA
recommended dry salt waste surrogates that represented actual wastes found at DOE facilities.
The results of the tests showed that the waste forms produced by the CBPC process met the RCRA UTS standards for
metals and the NRC disposal criteria. Flammability test results showed the waste forms containing oxidizing salts
(nitrates) to be stable and safe. Based on the results of the testing, additional testing of the salt waste form is recommended
before full-scale deployment, such as the effects of salt anion leaching over time. For different waste streams, additional
analytical and development work would be needed to qualify wastes for disposal and to verify the operating parameters for
the specific wastes.
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Stabilize Ash Using Clemson's Sintering Process at Clemson University,
Clemson, South Carolina
Site Name:
Clemson University
Period of Operation:
1995
Purpose/Significance of Application:
Treatability study of stabilization of mixed waste fly ash using a sintering
process
Contaminants:
Metals
Fly ash contained heavy metals - cadmium (5,000 mg/kg), chromium (1,000
rag/kg), and lead (35,000 mg/kg)
Contacts:
Principal Investigator:
H. David Leigh, III
Department of Ceramic and Materials
Engineering
Clemson University
P.O. Box 340907
Clemson, SC 29634
Telephone: 864-656-5349
E-mail: david.leigh@eng.clemson.edu
MWFA Product Line Manager:
Vince Maio, Advisory Engineer
Mixed Waste Focus Area
Lockheed Martin Idaho Technologies
Company
Idaho National Engineering and
Environmental Laboratory
P.O. Box 1625
Idaho Falls, ID 83415
Telephone: 208-526-3696
Fax: 208-526-1061
E-mail: vmaio@inel.gov
Location:
Clemson, SC
Cleanup Authority:
Not identified
Cleanup Type:
Bench scale
Waste Source:
Fly ash from the WERF incinerator at
INEEL
Technology:
Stabilization using Clemson's Sintering Process
Used a high iron/high potassium alumino silicate clay material - Red Roan
Formation (RRF)
A preliminary study and three statistically designed experiments performed to
evaluate and optimize processing parameters
Preliminary study - 67 vol% to 50 wt% equivalent fly ash/RRF mixture and a
high moisture content (18.1 wt%), pressed at 5,000 psi, then fired at 1,000ฐC
to produce waste form pellets
Experiment I - to evaluate the effects of different physical properties on the
waste form included 16 batches to test varying formulations; batch size - 270
grams; material pressed at 1,000 psi then fired between 1,025 and 1,075 ฐC
Experiment II - to optimize factors from experiment I included 15 batches
(500 grams each); fired between 1,025 and 1,075ฐC; TCLP leach testing
performed on waste forms
Experiment III - to further evaluate effects of four physical properties
(moisture content, waste loading, mixing time, auger speed) involved 27
batches, prepared using varying formulation based on the results of the second
experiment
Type/Quantity of Media Treated:
Incinerator fly ash
Regulatory Requirements/Cleanup Goals:
RCRA Land Disposal Restriction criteria
TCLP concentrations in mg/L - cadmium (0. 19), chromium (0.86), lead (0.37), and zinc (5.3)
164
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Stabilize Ash Using Clemson's Sintering Process at Clemson University,
Clemson, South Carolina
Results:
Preliminary study - TCLP results were above the limits for cadmium, lead, and zinc
Experiment I - significant factors affecting the waste form included firing temperature, the RRF particle size
distribution, and waste loading
Experiment II - TCLP results showed that leach values for metals increased with increased waste loadings and
decreased as the temperature increased; TCLP limits were met when waste loadings were below 20% vol
Experiment III - TCLP results showed that leach values for metals increased as the waste loading increased, decreased
as moisture content decreased; mixing time and auger speed were not significant factors
Costs:
No methodology has been selected to date to evaluate costs associated with full-scale deployment of the Clemson
stabilization process
Description:
A bench-scale treatability study was conducted at Clemson University in 1995 to determine whether stabilization using a
sintering process could be used to immobilize DOE waste. The study was funded by DOE through a cooperative
agreement with University Programs at the Savannah River Site. The process involves mixing a high iron/high potassium
aluminosilicate clay material with the waste, pressing the material, then firing the material to produce a ceramic waste
form. For this study, Red Roan Formation (RRF) was used as the clay material and fly ash from the WERF incinerator at
INEEL (containing high levels of metals) was used as the waste. A preliminary study and three statistically designed
experiments were performed to evaluate the process and to obtain operating data for use in future pilot-scale testing.
The results of the treatability study showed that the process can produce stable, low porosity waste forms that meet the
RCRA TCLP limits for metals at waste loadings of 20% vol or lower. This waste loading was lower than originally
anticipated. Other significant factors affecting the waste form included firing temperature and the particle size distribution
of the RRF. The process is applicable to most inorganic homogeneous solids and sludges such as ash, soils, and
particulates, but is not well siuted for aqueous and organic liquids or heterogeneous debris. Based on the results of the
treatability study, a pilot-scale demonstration of the process is planned for FY 1999.
165
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Mixed Waste Encapsulation in Polyester Resins at the Hanford Site
Site Name:
Hanford Site
Location:
Richland, WA
Period of Operation:
Not identified
Cleanup Authority:
RCRAandNRC
Purpose/Significance of Application:
Treatability study of various polyester resins to stabilize high salt-containing
mixed waste
Cleanup Type:
Treatability study
Contaminants:
Metals and radionuclides
Spiked metals concentrations in treatability study wastes - arsenic (159.3
mg/kg), barium (154.1 mg/kg), cadmium (119 mg/kg), chromium (151.3
mg/kg), lead (132.7 mg/kg), and selenium (140.9 mg/kg)
Spiked radionuclide concentrations in treatability study wastes - cesium
(1.2xl05 pCi/L), cobalt (l.lxlO5 pCi/L), strontium (l.lxlO5 pCi/L), and
tecnetium (1.3xl05 pCi/L)
Waste Source:
Salt-containing mixed wastes from
DOE processes and surrogate wastes
Contacts:
Principal Investigator:
Rabindra Biyani
COGEMA Engineering Corporation
P.O. Box 840
Richland, WA 99352
Telephone: 509-376-1004
E-mail: biyani@COGEMA-
Engineering. com
MWFA Product Line Manager:
Vince Maio, Advisory Engineer
Mixed Waste Focus Area
Lockheed Martin Idaho Technologies
Company
Idaho National Engineering and
Environmental Laboratory
P.O. Box 1625
Idaho Falls, ID 83415
Telephone: 208-526-3696
Fax: 208-526-1061
E-mail: vmaio@inel.gov
Technology:
Microencapsulation by Polyester Resin
Four polyester resins tested - polymer (trade name) - orthophthalic (S2293),
isophthalic (Aropol 7334), vinyl ester (Hetronฎ 922-L25), and water
extendable (Aropol WEP 662 - proprietary)
WEP resin was tested on aqueous wastes; other three were tested on dry waste
Initiator (catalyst) - cobalt naphthenate
Mixer equipped with a variable speed paddle and sample molds for curing
Dry waste added as free-flowing powder; aqueous waste was slurried
Mixing time - 5 to 10 minutes at a low rate to homogenize waste; additional 2
to 5 minutes at a high rate after initiator added (until the temperature rises
indicating the onset of curing)
Curing molds placed in adiabatic chambers
Three tests using surrogate wastes; one test using a Hanford waste stream
Type/Quantity of Media Treated:
Process waste streams
Regulatory Requirements/Cleanup Goals:
RCRA Land Disposal Restriction (LDR) and NRC disposal criteria
Treatability test targeted to TCLP levels for RCRA heavy metals - cadmium (1.0 mg/L), hexavalent chromium (5.0
mg/L), lead (5.0 mg/L) and mercury (0.2 mg/L)
NRC teachability indices - target of 6 or higher
166
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Mixed Waste Encapsulation in Polyester Resins at the Hanford Site
Results:
Orthophthalic, isophthalic, and vinyl ester resins:
For RCRA metals, TCLP results for resins were below the target levels for all metals except cadmium. Failure was
attributed to the sampling method which required the mold be cut to a smaller size (9mm), possibly destroying the
polyester coating. To counter the effect, fully coated polyester waste form molds of 9mm were specifically prepared for
TCLP testing; this sample passed for all metals including cadmium
Results were also compared to the UTS criteria - most samples failed for RCRA metals
Polyester microencapsulation was validated for salt loadings of 30-wt% for all three resins, and for salt loadings of up to
70% for the Orthophthalic resin
WEP resin:
For RCRA metals, TCLP results were below the targeted levels for all metals
Results were also compared to the UTS criteria - samples passed for all metals expect for cadmium
For radionucides, the teachability indices ranged from 10.1 to 10.8
Costs:
Projected full-scale cost for the polyester resin encapsulation process - capital cost of $2 million including equipment
design and development and operating cost of $5,940/cubic meter of waste form
Disposal cost of $2,100/cubic meter of waste form
Description:
The Mixed Waste Focus Area, a DOE Environmental Management (EM) -50 program, sponsored the development of five
low-temperature stabilization methods as an alternative to cement grouting to stabilize salt-containing mixed waste. One
of the alternative methods is microencapsulation using polyester resins. COGEMA Engineering Corporation performed a
series of treatabilitiy studies and developmental tests of the technology at the Hanford site. The studies included
encapsulation of salt-containing mixed wastes from the Handford site and with surrogate wastes spiked with contaminants.
Four types of resins were tested: Orthophthalic polyester, isophthalic polyester, and vinyl ester for dry waste, and a water-
extendible polyester resin for aqueous wastes. The cured waste forms were evaluated against the RCRA LDR and NRC
disposal criteria.
The results of the studies showed that the encapsulation of salt-containing mixed waste using polyester resins is applicable
to inorganic, relatively homogeneous low-level mixed wastes containing high levels of salt. Further development is needed
to identify chemical additives to reduce the solubility and toxicity of the RCRA metals. Other factors to be considered in
future development of the process include safety controls to address potential flammable and unstable conditions when
using polyester encapsulation, and additional research into the long-term effectiveness of the technology.
167
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Innovative Grouting and Retrieval at the Idaho National Engineering
and Environmental Laboratory, Idaho Falls, Idaho
Site Name:
Idaho National Engineering and Environmental Laboratory (INEEL)
Location:
Idaho Falls, ID
Period of Operation:
Summer of 1994 (innovative grouting and retrieval)
Summer of 1995 (polymer grouting)
Summer of 1996 (variety of grouting materials)
Cleanup Authority:
Not identified
Purpose/Significance of Application:
Field demonstration of innovative jet grouting and retrieval techniques that are
applicable to TRU wastes
Cleanup Type:
Full scale and field demonstrations
Contaminants:
Radioactive and nonradioactive wastes
Demonstration used nonradioactive tracer to simulate radioactive materials
Waste Source:
Buried drums and waste from DOE
operations
Contacts:
Technical Contact:
G.G. Loomis
Lockheed Martin Idaho
Technologies Company
INEEL
P.O. Box 1625, MS 3710
Idaho Falls, ID 83415
Telephone: 208-526-9208
E-mail: guy@inel.gov
DOE Contacts:
Skip Chamberlain
Subsurface Contaminants
Focus Area HQ Lead
DOE EM50
Germantown, MD
Telephone: 301-903-7248
James Wright
Subsurface Contaminants
Focus Area Program
Manager
DOE Savannah River
Aiken, SC
Telephone: 803-725-5608
Technology:
Innovative Grouting and Retrieval (IGR)
Demonstrated on a waste pit (10 ft3), loaded with 55-gal cardboard and steel drums, and
cardboard boxes (4 ft3) filled with waste and rare-earth tracer designed to simulate
transuranic (TRU) pits
Three phases - jet grouting, application of demolition grout, and retrieval of the waste
Jet grouting - CASA GRANDE drill system and a high pressure displacement pump used
to inject grout at a nominal 6,000 psi; total of 24 yds3 of Portland cement injected into 36
grout holes, creating a monolith
Demolition grouting - immediately following jet grouting, thin-walled, spiral-wrapped
tubes were inserted into the holes and allowed to cure, after which the demolition grout
(BRISTAR) was added to the tubes; however, the grout did not expand as planned and
the soil/waste matrix was not fractured
Retrieval - a backhoe bucket was used to remove the monolith
Wall Stabilization Technique Using Jet Grouting for Hot Spot Removal
Created a U-shaped wall by jet grouting Portland cement into an existing cold test pit at
INEEL containing drums and boxes
Jet grouting phase - 52 holes jet grouted to create the wall (30 ft along back and sides of
U extended 8 feet); used jet grouting apparatus at 6,000 psi; total of 24 yds3 of Portland
cement injected
Stabilization evaluation phase - wall excavated and visually examined; no collapse or
structural damage to wall during excavation and no visible voids; grout mixed with soil
and formed a soilcrete material that filled some voids; neat Portland cement filled other
voids
Jet Grouted Polymer for Waste Stabilization or as an Interim Technique Before Retrieval
Demonstrated on two waste pits designed to simulate TRU pits containing drums; used
55-gallon drums containing cloth, paper, metal, wood, and sludge; tracer placed in each
drum to simulate plutonium oxide
Tested two formulations of an acrylic polymer - one to produce a hard, durable material
for long-term encapsulation; one to form a soft material for retrieval
Hard polymer pit -18 holes jet grouted into 4.5 x 9 x 6 ft pit; after curing, hard polymer
was fractured and removed
Soft polymer pit -15 holes jet grouted into 4.5 x 9 x 6 ft pit; after curing, removed with a
backhoe
In Situ Stabilization
Demonstrated variety of grouting materials - TECT grout, WAXFIT, Hermite, water-
based epoxy, and Type H cement; jet grouted to form monoliths of buried waste
168
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Innovative Grouting and Retrieval at the Idaho National Engineering
and Environmental Laboratory, Idaho Falls, Idaho
Type/Quantity of Media Treated:
Soil and debris
Steel drams; cardboard boxes containing metal pipe, wire, and plate steel; paper
Regulatory Requirements/Cleanup Goals:
Purpose of the demonstrations was to evaluate different jet grouting techniques for use in stabilization and hot-spot
retrieval of waste; nonradioactive wastes used for demonstrations
No specific cleanup goals were identified
Results:
IGR - produced stable monolith; monolith was removed in 5 hrs; general soilcrete mix easily removed; grouted waste
that were more difficult to retrieve included grouted boxes containing metal pipe, wire, and plate steel and grouted
computer paper, which disintegrated during removal
Wall - produced a solid wall with no visible voids; wall was stable and excavated intact
Soft polymer - soft polymer material was removed easily; however, tracer material was detected at two-orders of
magnitude above background; determined that one of the containers was not penetrated during drilling; but was
punctured during removal releasing tracer
Hard polymer - produced cured, stabilized monolith with no voids; easily fractured with a backhoe and removed
Various grout materials - TECT, WAXFIT, and Type H materials are easily jet grouted and produced stable monoliths;
Hermite and water-based epoxy cannot be jet grouted
In general, grouting techniques did not spread tracer, indicating that release of radioactive particulates would be
minimized during operations
Costs:
Costs projected for IGR, jet grouting using TECT, and jet grouting using WAXFIT; costs developed for 1-acre; for IGR
costs also developed for 4-acre TRU contaminated site
IGR - projected cost is $19 million (1-acre) and $64 million (4-acre), including grouting and waste management,
excavation, secondary waste management, and D&D equipment
TECT - projected cost is $15 million, assuming pit is left in place permanently; includes costs for grouting and waste
management and secondary waste management, but no costs for caps
WAXFIT - projected costs is $20 million, assuming waste pit is a soft polymer and is retrieved; includes costs for
grouting and waste management and retrieval operations
Jet grouting technologies were less expensive than the baseline retrieval, packaging, and storage ($200 million for 1-
acre; $305 million for 4-acres)
Description:
Between 1994 and 1996, a number of different innovative jet grouting techniques were demonstrated at INEEL to
determine their potential for use in stabilization and retrieval of buried transuranic (TRU) and other wastes at DOE
facilities. Nonradioactive debris containing a rare-earth tracer were tested on waste pits designed to simulate those found
at TRU sites. Technologies demonstrated included innovative grouting and retrieval, wall stabilization techniques using
jet grouting for hot-spot removal, jet grouted polymer for waste stabilization, and various grouting materials for
stabilization.
The results of the demonstrations indicated that a number of the jet grouting technologies produce stable waste forms that
are generally easy to remove, thus making the technology suitable for stabilization and for hot-spot removal. In addition,
the costs for jet grouting and retrieval is up to 90% less than the costs for the baseline technology of retrieval, packaging,
and storage. Further testing is need of the BRISTAR demolition grout, which did not perform as expected, and long-term
durability studies of the materials are recommended, including development of monitoring systems to ensure complete
encapsulation of the waste.
169
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Polysiloxane Stabilization at
Idaho National Engineering and Environmental Laboratory, Idaho Falls, Idaho
Site Name:
Idaho National Engineering and Environmental Laboratory (INEEL)
Location:
Idaho Falls, ID
Period of Operation:
1997 - 1998
Cleanup Authority:
RCRA and NRC
Purpose/Significance of Application:
Demonstration of polysiloxane to encapsulate high-salt content wastes
Cleanup Type:
Field demonstration
Contaminants:
Heavy Metals
hexavalent chromium -1.045 ppm in one surrogate waste
oxides of lead, mercury, cadmium, and chromium at 1,000 ppm each in two
surrogate wastes
Waste Source:
Salt-containing wastes designed to
simulate wastes from DOE operations
Contacts:
Vendor Contact:
Dr. Steve Prewett
Orbit Technologies
Palomar Triad One
2011 Palomar Airport Road, Suite 100
Carlsbad, CA
330-794-2122
Principal Investigator:
G.G. Loomis
Lockhead Martin Idaho Technologies
Company
INEEL
P.O. Box 1625 (MS 3710)
Idaho Falls, ID 84315
208-526-9208
guy@inel.gov
MWFA Product Line Manager:
Vince Maio, Advisory Engineer
Mixed Waste Focus Area
Lockheed Martin Idaho Technologies
Company
Idaho National Engineering and
Environmental Laboratory
P.O. Box 1625
Idaho Falls, ID 83415
Telephone: 208-526-3696
Fax: 208-526-1061
E-mail: vmaio@inel.gov
Technology:
Stabilization using polysiloxane
Polysiloxane is a part inorganic part thermosetting polymer; for the
demonstration, Orbit Technology's polysiloxane material was used
The base chemicals (SiH and SiOH) are mixed with the waste and reacted in
the presence of a platinum catalyst to form the desired thermosetting polymer
and hydrogen gas
A filler such as quartz can be added to strengthen the waste form
The resultant vinyl-polydimethyl-siloxane product is gelled, and cured to form
a solid waste form
For the demonstration, the process was tested on three different salt surrogates
- Pad-A salts from INEEL, one high chloride salt surrogate, and one high
nitrate salt surrogate
Type/Quantity of Media Treated:
Process waste streams
Regulatory Requirements/Cleanup Goals:
RCRA Land Disposal Restriction (LDR) and DOT
Target TCLP levels for RCRA heavy metals - cadmium (1.0 mg/L), hexavalent chromium (5.0 mg/L), lead (5.0 mg/L)
and mercury (0.2 mg/L); also compared to RCRA universal treatment standards (UTS)
DOT oxidizer test for nitrate salt wastes
NRC recommended compressive strength of at least 60 psi
170
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Polysiloxane Stabilization at
Idaho National Engineering and Environmental Laboratory, Idaho Falls, Idaho
Results:
INEEL Pad-A salt surrogate waste form - met the target TCLP levels; but did not meet the UTS standard for chromium;
had a compressive strength of 637 psi
Chloride salt surrogate waste form - met the target TCLP levels; did not meet the UTS standard for cadmium or
chromium
Nitrate salt surrogate waste form - met the target TCLP levels; did not meet the UTS for chromium or mercury; passed
the DOT oxidizer test
Costs:
Cost for full-scale polysiloxzane treatment are about $8/lb or $573 per cubic foot of salt waste
The cost for polysiloxane encapsulation is competitive with the baseline technology of Portland cement stabilization
Description:
The Mixed Waste Focus Area, a DOE Environmental Management (EM)-50 program, sponsored the development of five
low-temperature stabilization methods as an alternative to cement grouting to stabilize salt-containing mixed waste. One
of the alternative methods is stabilization using polysiloxane. A demonstration of Orbit Technology' s polysiloxane
encapsulation process for high-salt content wastes was performed at INEEL on three salt surrogates, representing wastes
found at DOE facilities.
The results showed that the polysiloxane process produced a durable waste form for all three high-salt content surrogates.
The waste forms met the target TCLP levels for heavy metals, and the more stringent UTS standards for several of the
metals tested. The process is currently limited to nonaqueous solid materials. Treatability testing is recommended for
specific wastes prior to use of this technology. In addition, long-term durability testing of the polysiloxane waste forms is
needed.
171
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Amalgamation of Mercury-Contaminated Waste using NFS DeHgSM Process,
Applied Technology Laboratories, Erwin, TX
Site Name:
U.S. DOE INEEL, ETTP, and DSSI Facilities (tests conducted at Applied
Technology Laboratories, Erwin, TN)
Period of Operation:
1998
Purpose/Significance of Application:
Demonstrate amalgamation of elemental mercury
Contaminants:
Heavy metals
Mercury
Contacts:
Technology Vendor:
Nuclear Fuel Services, Inc.
Erwin, Tennessee
Contacts:
Thomas B. Conley
Oak Ridge National Laboratory
Telephone: (423) 574-6792
Fax: (423) 574-7241
E-mail: tbc@ornl.gov
William Owca
DOE Idaho Operations Office
Telephone: (208) 526-1983
Fax: (208) 526-5964
E-mail: owcawa@inel.gov
Location:
Idaho and Tennessee
Cleanup Authority:
Not identified
Cleanup Type:
Field demonstration
Waste Source:
Nuclear processing operations
Technology:
Amalgamation using the NFS DeHgSM Process
Prior to amalgamation, waste is sorted, shredded, and slurried to create a
homogeneous mixture
The first step in the process is to stabilize elemental mercury using one or
more amalgamation agents (agents not specified)
A possible second step is a chemical stabilization process using a proprietary
reagent to break mercury complexes and allow removal of mercury as a
precipitant; this step is required if the waste fails the cleanup criteria after the
first step
Treated material is produced as a presscake; filtrate is either recycled to the
reactor or discharged
Processing was conducted at ambient conditions in a ventilated hood
Type/Quantity of Media Treated:
Liquid mercury
5 1 kg from East Tennessee Technology Park, formerly the K-25 Site;
characterized as RCRA Waste Code U151
23 kg from INEEL; contained oil at 17% by volume; characterized as RCRA
Waste Code D009
1 kg from Diversified Scientific Services (DSSI); this material had been
recovered from a thermal desorption treatability study; also D009
Regulatory Requirements/Cleanup Goals:
Envirocare of Utah Waste Acceptance Criteria
For mercury - TCLP leachate concentration of 0.20 mg/L; also considered UTS of 0.025 mg/L
Results:
Wastes from INEEL (DSSI wastes were combined with those from INEEL) were treated with two step process; for
mercury - TCLP leachate in presscake from second step averaged 0.05 mg/L (range 0.02 to 0. 12 mg/L); TCLP leachate
in oil phase was 0.03 mg/L; total of 15 amalgams weighed 1 14 kg
Wastes from ETTP were treated with two step process; for mercury - TCLP leachate in presscake from second step
averaged 0.05 mg/L (range 0.01 to 0.17 mg/L); total of 20 amalgams weighed 238 kg
Costs:
Projected costs for treating more than 1,500 kg were $300/kg, assuming waste is elemental mercury, and does not
include disposal costs of the treated waste
172
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Amalgamation of Mercury-Contaminated Waste using NFS DeHgSM Process,
Applied Technology Laboratories, Erwin, TX
Description:
Nuclear Fuel Services (NFS) conducted a demonstration of an amalgamation technology on wastes containing elemental
mercury. The NFS process consists of a two step process, where mercury is first treated using amalgamation agents and
then with proprietary chemical stabilization agents, and is conducted in a hood at ambient conditions.
Wastes from ETTP, INEEL, and DSSI were tested using this process. Results showed that the process reduced the
concentration of mercury to 0.05 mg/L (on average) for each of 35 batches tested, and that the product met the Envirocare
Waste Acceptance Criteria. Projected costs for use of the technology were $300/kg and costs for treating smaller amounts
of wastes, such as at a specific site, were projected to be prohibitive. The report discusses the possibility of a national
procurement contract to lower the cost of the technology on a unit mass basis.
173
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Amalgamation of Mercury-Contaminated Waste using ADA Process,
Colorado Minerals Research Institute
Site Name:
U.S. DOE Los Alamos National Laboratory and Fernald Facilities (tests
conducted at Colorado Minerals Research Institute)
Period of Operation:
1998
Purpose/Significance of Application:
Demonstrate amalgamation of elemental mercury
Contaminants:
Heavy metals
Mercury
Contacts:
Technology Vendor:
ADA Technologies
Englewood, CO
Contacts:
Thomas B. Conley
Oak Ridge National Laboratory
Telephone: (423) 574-6792
Fax: (423) 574-7241
E-mail: tbc@ornl.gov
William Owca
DOE Idaho Operations Office
Telephone: (208) 526-1983
Fax: (208) 526-5964
E-mail: owcawa@inel.gov
Location:
New Mexico and Ohio
Cleanup Authority:
Not identified
Cleanup Type:
Field demonstration
Waste Source:
Nuclear processing operations at U.S.
DOE Los Alamos National Laboratory
and Fernald Facilities
Technology:
Amalgamation using the ADA Process
Process consists of combining liquid mercury with a proprietary sulfur
mixture in a pug mill to stabilize the elemental mercury
The pug mill was a dual shaft mixer 0.9 m long with a 0. 1 nf cross section,
and held 0.06 m3 of material; the mixing blades were 14 cm long and
overlapped; mixing speed was 50 rpm
Mixing was concluded when the reaction exotherm subsided and free
elemental mercury analysis indicated that more than 99% of the mercury had
reacted
Air above the pug mill was swept to remove mercury vapors and filtered
through a HEPA filter and a sulfur-impregnated carbon filter to capture
mercury
Processing was conducted at ambient conditions
Type/Quantity of Media Treated:
Liquid mercury
1 12 kg of mercury from LANL and 20 kg from Fernald
No radioactivity was detected in either waste stream
The waste from Fernald contained significant amounts of water
Regulatory Requirements/Cleanup Goals:
Envirocare of Utah Waste Acceptance Criteria
RCRA TCLP limit for mercury - 0.20 mg/L
Results:
Wastes were processed in 5 batches (4 from LANL and 1 from Fernald) of 20 to 33 kg/batch
The amount of free mercury was reduced from 99.87 to 99.98% per batch
TCLP mercury was less than 0. 1 mg/L in each batch, with a mercury waste loading of 57%
Product from the amalgamation process was found to meet the Envirocare Waste Acceptance Criteria
Mercury vapor concentrations above the pug mill were below the TLV of 50 ug/nf
Costs:
Projected costs for full-scale amalgamation using the ADA Process were $300/kg for more than 1,500 kg, assuming
waste is elemental mercury, and does not include disposal costs of the treated waste
174
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Amalgamation of Mercury-Contaminated Waste using ADA Process,
Colorado Minerals Research Institute
Description:
ADA Technologies conducted a demonstration of a proprietary amalgamation technology on wastes containing elemental
mercury from Los Alamos and Fernald. The ADA process consists of combining liquid mercury with a proprietary sulfur
mixture in a pug mill, and is conducted at ambient conditions.
Results showed that the process reduced the free mercury by 99.87 to 99.98%, and that the product met the Envirocare
Waste Acceptance Criteria and passed the RCRA TCLP criteria for mercury. Projected costs for use of the technology
were $300/kg and costs for treating smaller amounts of wastes, such as at a specific site, were projected to be prohibitive.
The report discusses the possibility of a national procurement contract to lower the cost of the technology on a unit mass
basis.
175
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GTS Duratek (GTSD) Process for Stabilizing Mercury (<260 ppm) Contaminated
Mixed Waste from U.S. DOE's Los Alamos National Laboratory
Site Name:
U.S. DOE Los Alamos National Laboratory (tests conducted at GTSD Bear
Creek Operations Facility)
Location:
New Mexico
Period of Operation:
September 1997 to September 1998
Cleanup Authority:
Not identified
Purpose/Significance of Application:
Demonstrate stabilization of low level mercury in radioactive wastes
Cleanup Type:
Treatability studies
Contaminants:
Heavy metals, Volatile Organics, and Radionuclides
Mercury concentration was 230 mg/kg; TCLP 0.0399 to 0.184 mg/L
DCE concentration was 11,000 mg/kg, vinyl chloride 220 mg/kg, methylene
chloride 12,000 mg/kg
Radionuclides included plutonium and strontium
Waste Source:
Nuclear processing operations
Contacts:
Technology Vendor:
GTS Duratek
Kingston, Tennessee
Contacts:
Thomas B. Conley
Oak Ridge National Laboratory
Telephone: (423) 241-1839
Fax: (423) 241-2973
E-mail: tbc@ornl.gov
William Owca
DOE Idaho Operations Office
Telephone: (208) 526-1983
Fax: (208) 526-5964
E-mail: owcawa@inel.gov
Technology:
Stabilization
Stabilization reagents involved addition of water and then cement to form a
grout mixture; the mixture was then blended with sodium metasilicate and
cured for two days
Bench- and pilot-scale tests were conducted, at high and low waste loadings
Pilot-scale tests were conducted in drums using a vertical in-drum mixer
Type/Quantity of Media Treated:
Sludge and Laboratory Wastes
Four 55-gallon drums containing 1,253 Ibs of sludge
Three containers of lab packs from analysis of the sludge
Regulatory Requirements/Cleanup Goals:
Land Disposal Restrictions for heavy metals (such as mercury - 0.025 mg/L) and organics
Envirocare Waste Acceptance Criteria (WAC) for disposal
Results:
At low waste loadings, mercury concentrations were reduced to values ranging from 0.00127 to 0.0169 mg/L, below the
LDR standard of 0.025 mg/L; at high waste loadings, mercury was reduced to values ranging from 0.0024 to 0.0314
mg/L - one sample contained mercury above the LDR standard
Several organic compounds and radionuclides were higher than the LDR standards or Envirocare WAC after treatment,
including 1,1,1-trichloroethane, 1,1-dichloroethane, methylene chloride, lindane, DDE, heptachlor epoxide, and
methoxychlor, strontium, and americium
The vendor indicated that these results re-emphasized the importance of accurate characterization data; the high levels
of organics were not expected based on the original characterization data provided by LANL
Bench-scale tests showed mercury met LDR level in all 3 low load and 2 of 3 high load samples
Costs:
Projected costs for a full-scale stabilization system using this technology were not developed
176
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GTS Duratek (GTSD) Process for Stabilizing Mercury (<260 ppm) Contaminated
Mixed Waste from U.S. DOE's Los Alamos National Laboratory
Description:
Sludge was generated at the Phase Separation Pits of the TA 35 facility of the Los Alamos National Laboratory (LANL) by
addition of a caustic solution to the condensate and particulates removed from laboratory fume hood exhausts by the phase
separators. The sludge and laboratory wastes from analysis of the sludge, were a mixed waste due to the presence of
radionuclides, heavy metals, and RCRA-listed organic compounds.
Bench- and pilot-scale tests of the GTS Duratek process were conducted to stabilize the contaminants in the sludge and
laboratory wastes. The GTS Duratek process includes addition of water, cement, and sodium metasilicate. The stabilized
product met the LDR standard for mercury in all but one high load test sample. However, several VOCs, pesticides,
herbicides, and radionuclides did not meet the LDR standards or Envirocare WAC after treatment. This result was
attributed to inaccurate characterization data of the waste streams, which did not show the relatively high levels of
organics.
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Stabilize High Salt Content Waste Using Sol Gel Process at
Pacific Northwest National Laboratory, Richland, WA
Site Name:
Pacific Northwest National Laboratory
Location:
Richland, WA
Period of Operation:
Not identified
Cleanup Authority:
RCRA and NRC
Purpose/Significance of Application:
Laboratory testing of the sol gel process to stabilize high salt content waste
Cleanup Type:
Laboratory scale treatability test
Contaminants:
Metals and salts
Two salt-containing, nonradioactive surrogates - one with nitrate salts; one
with chloride and sulfate salts
Both contained 1,000 mg/kg each of lead, chromium, cadmium, and nickel (in
the form of metal oxides)
Waste Source:
Salt waste surrogates that simulated
nonradioactive wastes from DOE
facilities
Contacts:
Technical Contacts:
Dr. Gary L. Smith
Pacific Northwest National Laboratory
P.O. Box 999, MSIN K6-24
Richland, WA 99352
Telephone: 509-372-1957
Fax:509-376-3108
E-mail: Gary.L.Smith@pnl.gov
Dr. Brian Zelinski
Arizona Materials Laboratory
University of Arizona
4715 East Fort Lowell Road
Tuscon, AZ 85712
Telephone: 520-322-2977
Fax: 520-322-2993
E-mail: brianz@engr.arizona,edu
MWFA Product Line Manager:
Vince Maio, Advisory Engineer
Mixed Waste Focus Area
Lockheed Martin Idaho Technologies
Company
Idaho National Engineering and
Environmental Laboratory
P.O. Box 1625
Idaho Falls, ID 83415
Telephone: 208-526-3696
Fax: 208-526-1061
E-mail: vmaio@inel.gov
Technology:
Stabilization using the Sol Gel Process
The Sol Gel processing is a general synthesis technique that uses hydrolysis
and condensation to produce solid matrices from liquids
Ceramic portion formed after tetraethlyorthosilicate (TEOS) was
prehydrolized with acidified water (0.15M HCL) in tertrahydrofuran (THF)
The polymer polybutadiene was added and the solution was refluxed for 30
minutes
Salt waste surrogate was mixed into the solution and stirred until the solution
thickened
Solution was then transferred to a plastic container, allowed to gel, then
capped (the cap was punctured with small holes to allow gas to escape) and
dried in an oven at 66 ฐ C for a minimum of 24 hours, then placed in a vacuum
oven at 70 ฐ C for three hours
The resulting material was a polyceram waste form
Process modified after initial test results showed open porosity in sample
waste forms; to minimize open porosity, dried samples were submerged in a
polycream or resin solution and placed under vacuum to allow infiltration,
then dried overnight
Type/Quantity of Media Treated:
Salt waste surrogates - two surrogates tested at waste salt loadings of 50 to 70%
Regulatory Requirements/Cleanup Goals:
RCRA TCLP criteria for metals
Leachability index (LI) of at least 6.0 for the salt components
Compressive strength of salt waste forms of at least 60 psi
Final waste form must incorporate at least 10-wt% of the salt component
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Stabilize High Salt Content Waste Using Sol Gel Process at
Pacific Northwest National Laboratory, Richland, WA
Results:
Initial samples met requirements for compressive strength and LI; however, forms contained open porosity which
exacerbated leaching, resulting in the samples not meeting the TCLP limits for metals
After process was modified to minimize open porosity, samples were below the TCLP limits for all metals and very near
or below the UTS limits for metals (results for cadmium and chromium were reported slightly above the UTS limits, but
results were below the practical quantification limits of the instrument)
The second waste form samples contained 50% of the chloride/sulfate salt surrogate; data on compressive strength and
LI were not available; however, report indicated that these samples were expected to be stronger and have a higher LI
than the first samples
Costs:
To date, no detailed cost analyses have been performed on this process
The report included an order of magnitude estimate for the Sol-Gel process in the range of $600,000 to $ 1 million for
design, capital equipment, installation, and startup costs, as well as obtaining the required environmental and operating
permits
Description:
At the Pacific Northwest National Laboratory, DOE conducted laboratory scale testing of the Sol Gel process to stabilize
high salt content waste. Two salt-containing, nonradioactive surrogates - one with high levels of nitrate salts and one with
high levels of chloride and sulfate salts - were used for the tests to simulate wastes at DOE facilities. The Sol Gel process
involved combining a polymer (polybutadiene) and an oxide-based ceramic (formed using TEOS, acidified water, and
THF) to produce a solid material referred to as a polyceram. The resulting polyceram waste forms were tested to
determine teachability and compressive strength at salt waste loadings of at least 10-wt%.
While initial samples met the requirements for compressive strength and teachability index, they did not meet the TCLP
criteria because the form contained open porosity. To minimize open porosity, the process was then modified to include
infiltration of dried samples with a resin. Test results for the infiltrated samples were below the TCLP levels and near or
below the UTS levels. While a detailed cost analysis had not been performed on the process, an order of magnitude
estimate indicates that the process would cost in the range of $600,000 to $ 1 million.
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ATG Process for Stabilizing Mercury (<260 ppm) Contaminated Mixed Waste from
U.S. DOE's Portsmouth, Ohio Facility
Site Name:
U.S. DOE Portsmouth, Ohio (tests conducted at Mountain States Analytical
Laboratory)
Period of Operation:
1998
Purpose/Significance of Application:
Demonstrate stabilization of low level mercury in radioactive wastes
Contaminants:
Heavy metals and Radionuclides
Mercury concentration was 1.06 mg/mL
Technetium-99 present at 680 pCi/g
Other heavy metals included barium, cadmium, and chromium
Contacts:
Technology Vendor:
Allied Technology Group
Fremont, CA
Contacts:
Thomas B. Conley
Oak Ridge National Laboratory
Telephone: (423) 241-1839
Fax: (423) 241-2973
E-mail: tbc@ornl.gov
William Owca
DOE Idaho Operations Office
Telephone: (208) 526-1983
Fax: (208) 526-5964
E-mail: owcawa@inel.gov
Location:
Portsmouth, Ohio
Cleanup Authority:
Not identified
Cleanup Type:
Field demonstration
Waste Source:
Nuclear processing operations
Technology:
Stabilization
Stabilization reagents included proprietary dithiocarbamate (DTC),
phosphate, polymeric reagents, and generic reagents such as magnesium oxide
and activate carbon
Bench-scale and field demonstration tests were conducted
Bench-scale tests showed that DTC without other reagents provided the best
results
Field demonstration tests were conducted on three-3 3 kg batches of waste,
using a 7 ft3 mortar mixer
Type/Quantity of Media Treated:
Ion exchange resin
160 kg of resin (liquid waste) containing <5% solids
Regulatory Requirements/Cleanup Goals:
Universal treatment standard (UTS) for mercury of 0.025 mg/L
Results:
Mercury concentrations were reduced on average from 1.06 to 0.0092 mg/L, below the UTS of 0.025 mg/L; 99% of the
mercury was stabilized
Cadmium, the other heavy metal present at concentrations higher than the UTS, was reduced on average from 0.371 to
0.053 mg/L, below the UTS of 0.11 mg/L; 86% of the cadmium was stabilized
The average density of the treated waste was 1.17 kg/L, which was a 17% weight increase and a 16% volume increase
from the untreated waste
No mercury vapors or radioactivity was detected during the demonstration
Costs:
Projected costs for a 1,200 Ib/hr stabilization system included capital costs of $30,000 and operating costs of $95/hr of
operation
These correspond to a life cycle cost of $ 1 .73/kg, without decontamination and decommissioning
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ATG Process for Stabilizing Mercury (<260 ppm) Contaminated Mixed Waste from
U.S. DOE's Portsmouth, Ohio Facility
Description:
Allied Technology Group (ATG) conducted a demonstration of stabilization of mixed wastes containing less than 260 ppm
of mercury. The ATG technology used dithiocarbamate (DTC) to stabilize 160 kg of ion exchange resin containing <5%
solids. The resin was contaminated with heavy metals including mercury and cadmium.
The DTC formulation stabilized mercury and cadmium to concentrations lower than the UTS, with a relatively small
increase in weight and volume. A life cycle cost of $ 1.73/kg of waste was projected for use of this technology at a full
scale.
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Graphite Electrode DC Arc Furnace at the Idaho National Engineering and
Environmental Laboratory, Idaho Falls, Idaho
Site Name:
Idaho National Engineering and Environmental Laboratory (INEEL)
Period of Operation:
1997-1998
Purpose/Significance of Application:
Determine potential applicability of DC arc plasma furnace to treat a variety of
wastes from DOE facilities
Contaminants:
Metals, Radionulcides
Plutonium-238 and heavy metals including lead
Contacts:
Principal Investigator:
Ronald Goles
Battelle, Pacific Northwest National
Laboratory
P.O. Box 999, MS K6-24
Richland, WA 99352
Telephone: 509-376-2030
Fax:509-376-3108
E-mail: rwgoles@pnl.gov
MWFA Product Line Manager:
Whitney St. Michael
Mixed Waste Focus Area
Lockheed Martin Idaho Technologies
Company
Idaho National Engineering and
Environmental Laboratory
2525 N. Freemont
Idaho Falls, ID 83415
Telephone: 208-526-3206
Fax: 208-526-1061
E-mail: whitney@inel.gov
Technology:
Graphite Electrode DC Arc Furnace
Location:
Idaho Falls, ID
Cleanup Authority:
RCRA and NRC
Cleanup Type:
Bench-scale studies and engineering-
scale furnace (ESF) tests
Waste Source:
Waste streams and surrogates from
various DOE facilities
ESF system included the furnace, power control systems, feed systems, off-
gas system, and control system
ESF - 3 .5 ft diameter by 4 ft high stainless steel vessel enclosing the furnace
hearth; graphite crucible was lined with Monofrax K-3 refractory; four
graphite rods threaded into the crucible; layers of porous graphite, firebrick,
and refractory material surround crucible; nitrogen used to prevent oxygen
from attacking the graphite crucible
ESF included penetrations for glass overflow discharge, furnace offgas, and
pyrometer access; overflow section heated to temperatures as high as 1,500ฐC
to keep glass molten for pouring
Outer walls of furnace equipped with air cooling j acket and two cooling coils
- to prevent glass migration throughout refractories and insulation
Bottom drain - inductively heated/freeze-valve bottom drain for removing
metals and/or slag from the bottom of the furnace
Bench-scale testing included 43 nonradioactive waste tests and 5 radioactive
waste tests
Two ESF tests conducted in FY 1997
- one using feed spiked with heavy
metals and with plutonium surrogates; one using nonradioactive debris
First test feed rate was about 5 kg/hr and about 320 kg of feed material was
processed over an 86-hour period; operational problems caused furnace to be
shut down during second test
One ESF test conducted in FY 1998 on Pantex neutron generators - process
150 neutron generators over a 21 -hour period at a rate of 27 Ibs/hr
Type/Quantity of Media Treated:
INEEL wastes including soils, high metal wastes, organics/oils/solvents, and
debris
Slag from Rocky Flats
Plutonium-238 waste from SRS
Neutron generators (tritium and lead)
- about 150
Regulatory Requirements/Cleanup Goals:
RCRA Land Disposal Restriction criteria for metals and NRC disposal criteria
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Graphite Electrode DC Arc Furnace at the Idaho National Engineering and
Environmental Laboratory, Idaho Falls, Idaho
Results:
The first 1997 test performed as planned with minor problems such as failure of the overflow heater, which was
corrected; produced a uniform, homogeneous vitrified product with a low leach rate for TCLP metals; the behavior of
Plutonium-238 was identical to that of Plutonium-239, with the majority of the plutonium partitioning in the glass phase
During the second 1997 test, the furnace failed as a result of current firing through a fracture in the sidewall; the system
was shut down and repaired
1998 test results showed that the ESF was capable of processing neutron generators, with the resulting glass form
passing the TCLP test for metals; however, approximately 75% of the available lead partitioned to the off gas system
(attributed to the glass collection problem) and 85% of the available tritium was released through the process stack
Operational problems with the 1998 test included the inability to operate the bottom drain of the melter and the need to
operate in a continuous overflow mode, causing problems with glass collection
In general, high water content in sludges (30wt%) increased electrode corrosion, caused problems with feeding via the
solids auger and caused water to collect in the off-gas system
Costs:
Projected cost for full-scale - $50 to $80 million capital cost; operating costs of $12 to $18 million through the startup
period and $48 to $62 million for a five year operating period
Projected treatment and disposal costs - $7,400 to $10,800 per cubic meter, based on 17,000 cubic meters of waste
Total life cycle costs estimated to be $124 to $184 million
Description:
A series of bench-scale tests using radioactive and nonradioactive wastes were conducted at INEEL to determine the
potential for using a DC Arc Furnace for waste treatment. Several types of wastes were tested including Rocky Flats
Pondcrete (slag); INEEL soils, high metals wastes, organics/oils/solvents; and debris; and an SRS 238Pu contaminated
debris waste. A DC Arc ESF system, including the furnace, power control systems, feed systems, off-gas system, and
control system, was used for two sets of tests of radioactive and nonradioactive wastes in 1997, and to test the ability to
process neutron generators in 1998.
The results of the first 1997 test showed that the DC Arc Furnace could produce a solid, homogenous glass form that met
the TCLP criteria for metals. The system was then shutdown during the second test when the furnace failed. Following
repairs, the system was shown to be capable of processing neutron generators, with the glass form meeting the TCLP limits
for metals. However, several operational difficulties led to the partitioning of a majority of the primary contaminants
(tritium and lead) to the off-gas. Since these demonstrations, several design improvements have been made to the
prototype system, including a second generation melter and improvements in the feed system and off-gas treatment
systems.
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Plasma Hearth Process at the Science and Technology Applications Research
(STAR) Center,Idaho Falls, Idaho
Site Name:
STAR Center
Period of Operation:
1993 through 1997
Purpose/Significance of Application:
Demonstration of a plasma hearth furnace to treat metals and radionuclides in a
variety of waste types
Contaminants:
Metals and radionuclides
Nonradioactive cerium used in tests to simulate plutonium
Metals include arsenic, barium, cadmium, chromium, lead, mercury
Contacts:
Principal Investigators:
Ray Geimer
SAIC
545 Shoup Ave.
Idaho Falls, ID 83402
Telephone: 208-528-2144
Fax: 208-528-2194
E-mail: Ray Geimer@cpqm.saic.com
Carla Dwight
Argonne National Laboratory - West
P.O. Box 2528
Idaho Falls, ID
Telephone: 208-533-7651
E-mail: carla.dwight@anl.gov
MWFA Product Line Manager:
Whitney St. Michael
Mixed Waste Focus Area
Lockheed Martin Idaho Technologies
Company
Idaho National Engineering and
Environmental Laboratory
2525 N. Freemont
Idaho Falls, ID 83415
Telephone: 208-526-3206
Fax: 208-526-1061
E-mail: whitney@inel.gov
Location:
Idaho Falls, ID
Cleanup Authority:
RCRA and NRC
Cleanup Type:
Bench scale and pilot scale
Waste Source:
Wastes from DOE facility
operations and air pollution control
systems
Technology:
Plasma Hearth Process (PHP)
PHP is a high temperature thermal process that heats waste to a molten form,
which is then cooled into a glass/crystalline waste form; equipped with an air
pollution control system to remove particulates and volatiles in the offgas
PHP melt temperature - 1 ,650-2,200 ฐ C;
Three systems tested - nonradioactive bench-scale system (NBS), radioactive
bench-scale system (RBS), and nonradioactive pilot-scale system (NFS)
NB S- batch system with a refractory lined fixed hearth vessel equipped with a
150 KW Retech RP75T transferred arc plasma torch; feed rate of 15 Ibs/hr
RBS - batch system with a plasma chamber equipped with a 150 KW Retech
RP75T transferred arc plasma torch; feed rate of 30 Ibs/hr; holds eight, 1-
gallon waste containers and includes offgas treatment system
NFS - 6.5 ft by 6.5 ft cylindrical hearth equipped with a 1.2 megawatt Retech
RP600T plasma torch; feed rate of 1,000 - 1,500 Ibs/hr; holds three, 55-gallon
waste drums and includes offgas treatment
Type/Quantity of Media Treated:
NBS - Fly ash, soil, sludges, debris (concrete, asphalt, sheet rock, steel),
sodium nitrate
RBS - inorganic and organic sludges, debris (wood, graphite, and fire brick)
NFS -debris
Regulatory Requirements/Cleanup Goals:
RCRA Land Disposal Restriction (LDR) standards
Federal and state air emissions standards
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Plasma Hearth Process at the Science and Technology Applications Research
(STAR) Center,Idaho Falls, Idaho
Results:
Slag samples passed the RCRA limits for metals
Cerium oxide (plutonium oxide surrogate) was found to primarily partition to the vitreous slag; slightly higher retention
rates were noted for sludges as compared to combustible debris
All high vapor pressure metals (mercury, cadmium, lead), except barium, partitioned to the offgas system, where they
were removed prior to release from the stack
Stack emissions were generally below the air emission limits, including total particulates and metals, except for mercury
The process was shown to treat a wide variety of waste types
Costs:
Projected costs for full-scale system include:
Capitals - $50 to $86.2 million for facility construction and outfitting
Startup operating cost - $12 to $18 million
O&M for a 5-yr period - $48 to $62 million
Assuming 17,000 cubic meters of waste are treated, the projected unit cost for PHP is $7,400 to $10,800 per cubic
meter.
Description:
DOE sponsored a series of bench- and pilot-scale tests of the Plasma Hearth Process (PHP) at the STAR Center in
Idaho Falls, Idaho, conducted between 1993 and 1997. PHP is a high temperature thermal process that heats waste to a
molten form, which is then cooled into a glass/crystalline waste form. Three PHP systems were tested on a wide range of
wastes to evaluate the process for treating different wastes and to determine operating conditions. The three systems were
a nonradioactive bench-scale system (NBS), radioactive bench-scale system (RBS), and nonradioactive pilot-scale system
(NPS). The types of wastes tested included fly ash, organic and inorganic sludges, and a variety of debris; for the RBS
system, nonradioactive cerium was used as a surrogate for plutonium wastes.
The results showed that PHP was capable of treating a wide variety of radioactive and nonradioactive wastes, meeting the
RCRA LDR standards for metals and , with the exception of mercury, operating within the air emission requirements for
the systems. Differences were noted between the behavior of sludges and debris in the system, such as higher retention
rates for cerium oxide for sludges as compared to debris. Additional data are needed to better quantify the treatment of
debris using PHP. Other issues to be considered for full-scale deployment include additional data on the behavior of
radionuclides compared to the cerium surrogate, and a more detailed evaluation of PHP for high organic waste feeds.
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