EPA/ROD/R10-94/101
March 1995
EPA Superfund
Record of Decision:
Bangor Naval Submarine Base
(O.U. 4), Silverdale, WA
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DECLARATION OF THE RECORD OF DECISION
SITE NAME AND LOCATION
Naval Submarine Base, Bangor
Operable Unit 4
Silverdale, Washington
. STATEMENT OF BASIS AND PURPOSE
This decision document presents the selected action for Operable Unit 4 (OU 4) at the Naval Submarine
Base (SUBASE), Bangor in Silverdale, wasIiingtOD, chosen,in aCC()rdance with.t!1e Comprehensive
Environmental Response, Compensation, and Liability Act of 1980 (CERClA) as amended by the Superfund
Amendments and Reauthorization Act of 1986 (SARA), and, to the, extent practical, the National Oil and
Hazardous Substances Pollution Contingency Plan (NCP). OU 4 consists of two sites: Sites C-East and
C-West, which are contiguous. The no-action alternative was Chosen because human health and
environmental risks calculated for the sites are within the United States Environmental Prot~ction Agency's
(EPA's) acceptable risk range. This decision is based on the administrative record for these sites. '
The lead agency for this decision is the United States Navy. The EPA approves of this decision and, with
the Washington State Department of Ecology (Ecology), has participated in scoping the site investigations
and in evaluating alternatives for remedial action. The State of Washington concUrs with this decision.
DESCRIPTION OF THE REMEDY
The no-action alternative has been chosen for Sites C-East and C-West.
DECLARATION
No remedial action is necessary to ensure protection of human health and the environment. No further
monitoring or investigative studies Will be conducted. A 5-year review is not required.
The Navy used EP A guidelines and the. information d~veloped during the remedial investigation tc>' evaluate
the potential adverse ,effects on human health and the environment associated ,with exposure to site
chemicals. The potential exposure of workers and residents to chemicals detected at each site was estimated
for current and future scenarios. The evaluation, performed according to EPA's National Contingency Plan
and policy guidance, indicated that no action is necessary to be protective to human health and the
environment and that calculated risks from exposure to chemicals detected at the sites are within the EP A's
acceptable risk iange. '
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Signature sheet for the foregoing SUBASE, Bangor Operable Unit 4, Remedial Action, Record of Decision
betWeen ~e United States Navy and the United States Environmental Protection Agency, with concurrence
by the Washington State Department of Ecology.
6/7/r'1-
Date I
~d~t) ~
Captain Ernest R. Lockwood
SUBASE, Bangor Commandiug Officer
Upitcd.States Navy
3Q39O\94QS.121~OD
,.A..
/
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Signature sheet for the foregoing SUBASE, Bangor Operable Unit 4, Remedial Action, Record of Decision
between thc United States Navy and the United States Environmcntal Protection Agency, with co~currcncc by
thc Washington State Departmcnt of Ecology. .
..bl,;21111
. Datc I /
Carol Kracgc, Actmg P ogram M
Toxies Qcanup Program
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Signature sheet for the foregoing SUBASE, Bangor Operable Unit 4, Remedial ActioD, Record of Decision
betWeen the United States Navy and the United States Environmental Protection Agency, with concurrence
by the Washington Staie Department of Ecology. .
~ e&JL
Chuck Clarke
Regional Adminictrator, Region 10
United States EDviromnental Protection Agency
-"/19 1ft!
Date
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SUBASE, BANGOR OPERABLE UNIT 4
U.s. Navy CLEAN Contract
EogiDeering Field Activity, Northwest
Contract No. N6247~D-929S
, ero 0039 '
Record of Decision
Date: 05/31/94
Page i
CONTENTS
~
DECISION SUMMARY
....... ....... ......... ...... ...... ..... .......
1.0 IN1'R.ODUcnON ...... ~ . ., . . . . . .,. .,. . . .,. . . . ,. . . ~ . '. . . . . . . . . . . . . . .. 1
2.0 SITE NAME, LOCATION, AND DES~ON ............,........... 1
3.0 SITE InSTORY .............................,................... 3
4.0 PHYSICAL CHARAcrERISTICS OF OPERABLE UNIT 4 .............. 6
4.1 SURFACE WA1ER HYDROLOGY. . . . . . . . . . . . . . . . . . . . . . . .. 6
4.1.1 Site C-East ........................................ 6
4.1.2 'Site C- West. . '. . . . . . . . . . . '. . . . . . . . . . '. . . . . . . . . .'. . . . .. 6
4.1.3 Stream. Sediments. . . . . . . . . . . . . . . . . s'. . . . . . . . . . SO. . . . .. 8
4.2 SITE HYDROGEOLOGY. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 8
4.2.1 Vashon Recessional Outwash. . . . . . . . . . . . . . . . . . . . . . . . .. 8
4.2.2 Vashon Till . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ~ . . . .. 10
4.2.3 Vashon Advance Outwash . . . . . . . . . . . . . . . . . . . . . . . . . . .. 10
4.2.4 Kitsap Formation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 12
5.0 InGHLlGHTS OF COMMUNITY PARTICIPATION......... ... . '. . ... ,14
'6.0 SCOPE AND ROLE OF OPERABLE UNITS ........................ 15
7.0 SUMMARY OF SITE CHARAcrERISTICS ........... '. . . . . . . . . . . . .. 16
7.1 SITE C-WEST ......................................... 19
7.1.1 Surface Soil. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .: 19
7.1.2 Subsurface Soils. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 32
7.1.3 Surface Water and Sediment (Site C-West and Site C-East ... 33
7.1.4 Groundwater............................... ~.. ... . .36
7.2 SITE C-EAST . . '.. . . .. . . . . '. . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 38 .
7.2.1 Surface Soils. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 38
7.2.2 Subsurface Soils. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 54
7.2.3 Groundwater...................................... 55
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Record of Decision
Date: 05/31/94
Pageii
SUBASE, BANGOR: OPERABLE UNIT 4
U.s. Navy CLEAN Contract
Engineering Field Activity, Northwest
Contract No. N62474-89-D-9295
, ero 0039
CONTENTS (Continued)
~
8.0 SUMMARY OF Sl1'E RISKS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 57
8.1 HUMAN HEALTH RISK ASSESSMENT. . . . . . . . . . . . . . . . . . . .. 58
8.1.1 Exposure Assessment. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 58
8.12 Toxicity Assessment. . . . .. . .. . . . . . . . . . . . . . . . . . . . . . .. 59
8.1.3 Risk Characterization. . . . . . . . . . . . . . . .'. . . . . . . . . . . . . .. 60
8.1.4 Uncertainty....................................... 65
82 ECOLOGICAL RISK ASSESSMENT. . . . . . . . . . . . . . . . . . . . . . .. 65
,9.0 DESCRIPTION OF AL1ERNATIVE 1, NO ACTION. . . . . . . . . . . . . . . . .. 68
9.1 OVERAIJ.., PR01ECI10N OF HUMAN HEALTH AND TIlE ' ,
ENVIRONMENT. . . . . . . . . . . . . . . . . . . . . . . . '. . . . . . . . . . . . . .. 68
92 . NEPA COMPliANCE. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 69
10.0 EXPLANATION OF SIGNIFICANT CHANGES. . . . . . . . . . . . . . . . . . . .. .69
11.0 REFERENCES...........,.......................'............. 69
ATI'ACHMENT
1
Responsiveness Summary
FIGURES
1
2
3
4
5
6
7
8
Site Location and Geographic Setting. . . . . . . . . . . . . . . . . . . . . . . . . . . . . ., 2
Site C Site Map . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 4
Site C Surface Water Drainage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 7
Shallow Aquifer Site C Groundwater Flow Direction. . . .'. . . . . . . . . . . . . .. 9
Site C-East Monitoring Well Sample Locations. . . . . . . . . . . . . . . . . . . . .. 11
, Site C- West Monitormg Well Locations. . .O' . . . . . . . . . . . . . . . . . . . . . ~ .. 13
Background Well and Surface Soil Sample LOcations. . . . . . . . . . . . . . . ... 17
Site C-Surface Water and Sediment Sampling Locations. . . . . . . . . . . . . . ., 34
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2
3
4.
5
6
7
8
9
10
11'
12
13
14
15
16
17
18
19
,20
21
22
23
24
25
26,
27
'28
29
SUBASE, BANGOR OPERABLE UNIT 4
U.s. Navy CLEAN Contract
Engineering Field Activity, Northwest
Contract No. N62474-89-D-9295
ero 0039 '
Record of DecisioD
Date: 05/31/94
Page iii
CONTENTS (Continued)
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TABLES
Sample Snmmary for Site C . . 0 0 0 . 0 0 0 0 0 0 0 0 0 0 0 0 0 . 0 . 0 . 0 0 0 . . 0 0 0 . . 0 0 0 16
, Site C- West-Chemicals Detected in Surface Soil 0 00 '. 0 0 . . 0 0 0 . . . 0 0 0 . . .. 20
Site C-West-chemicals Detected in Construction Fill 0 0 0 . 0 ~ 0 0 . 0 0 0 . '0 . 0 21 '
Site C-West-Chemicals Detected in the Vashon Recessional Outwash Soil 0 22
Site C-West-Chemicals Detected in the Vashon Till Soil .0 0 0 0 . 0 . 0 . 0 . 0 . 0 23
Site C-West-Chemicals Detected in the Vashon Advance Outwash Soil. . .. 24
Site C-West-Chemicals Detected in Intermediate Groundwater Zone Soil. 0 25
Site C- West-Chemicals Detected in the Kitsap Formation Soil 0 0 0 . . 0 . 0 0 0 26
Site C-West-Chemicals Detected in Surface Water. 0 0 . 0 0 0 0 0 0 . 0 . . 0 0 0 .. 27
Site C-West-Chemicals Detected in Surface Sediment 0 . 0 0 . 0 0 0 . . 0 0 0 0 0 o. 28
Site C-West--chemica1s Detected in Perched Groundwater. 0 0 0 . 0 0 0 0 . . . 0 30
Site C- West-Chemicals' Detected in Shallow Aquifer Groundwater 0 0 . ~ 0 0" 31
Site C-East-Chemicals Detected in Surface Soil . 0 0 0 . . 0 0 .. 0 . 0 0 . . . 0 0 .. 39
Site C-East-chemicals Detected in the Structural Fill Soil ~. 0 . . 0 . . 0 0 0 . 0, 41
Site C-East-Chemicals Detected in the Vashon ReCessional Outwash Soil o. 42
Site C-East-chemica1s Detected in the VashQn Till Soil 0... 0 . 0 0 . 0 . 0 0 0 0 43
Site C-East-chemica1s Detected in the Vashon Advance Outwash. . . . . . .. 44'
, ,
Site C-East-chemicals Detected in the Intermediate Groundwater Zone
Soil o. 0 0 0 0 . . . 0 . 0 . . . . . . . 0 . . 0 . 0 . 0 . . . 0 . . . . . . 0 . 0 0 . 0 0 . . . . . . . 0 0 .. 46
Site C-East~emicals Detected in the KitSap Formation Soil 000 . . . . . 0 o. 47-
Site C-East-chemica1s Detected in Surface Water. 0 . 0 0 o. 0 . 0 . 0 . . . 0 0 .. 48
Site C-East--chemicals Detected in Surface Sediment. 0 0 . . 0 0 . 0 0 . . . 0 . o. 49
Site C-East-Chemicals Detected in the Perched Groundwater. . 0 0 . . 0 . . 0 0 50
Site C-East--chemicals Detected in the Shallow Aquifer Groundwater 000 .. 52
Site C-East-Human Health Ris~ and Chemicals of Potential Concern o. o. 62
Site C-East-Total Hazard Index and Cancer Risk o. 0 . . 0 . . . 0 . . 0 0 . 0 . . .. 62
Background Hazard Index and Cancer Risk ....... . . 0 . . 0 . . 0 . . . . . . . .. 62
Site C-East-Excess Hazard Ingex and Cancer Risk .. 0 . 0 . . . . .. . . . . . . o. 63
, Site C-West-Total Hazard Index and Cancer Risk ..0. 0....... 0 0... .'. 64
Site C-West-Excess Hazard Index and Cancer Risk . . . 0 . . .0 . . . . . . . . . .. 64
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Record of Decision
Date: 05/31/94
Page iv
SUBASE, BANGOR OPERABLE UNIT 4
. U.s. Navy CLEAN Contract
Engineering Field Activity, Northwest
Contract No. N62474-89-D-929S
ero 0039 .
ARAR
bgs
CERCLA
cfs'
COPC
cPAH
CRQL
EA
Ecology
EPA
EPC
FFA
FS
ft/ft
gm/L
gpm
GW
BEAST
In
HQ.
IAS
IGZ
IRIS
MCL
mgjkg
msl
NA
NACIP
NAD
Navy
NCP
NEESA
NPL
NTS
3039O\940S.121 \ROD
ABBREVIATIONS AND ACRONYMS
applicable or r~levant and appropriate requirement
below ground surface
Comprehensive Environmental Response, Compensation, and
Liability Act of 1980 .
cubic feet per second
chemical of potential concern
carcinogenic polycyclic aromatic hydrocarbons
contract-required quantitation limit
ecological assessment
Washington State Department of Ecology
United States Environmental Protection Agency
exposure-point concentrations
Federal Facilities Agreement
feasibility stUdy
foot per foot
grams per liter
gallons per minute
groundwater
Health Effects' Assessment Sl1mm~ry Tables ( database)
hazard index
hazard quotient
initial assessment study
intermediate groundwater zone
Integrated Risk Information System (database)
maximum cont~minaJ'lt limit
milligram per kilogram
mean sea level
not applicable . .
Navy Assessment and Control of Installation Pollutants
Naval Ammunition Depot
United States Navy
National Oil and Hazardous Substances Pollution Contingency Plan
Naval Energy and Environmental Support Activity
National Priorities List .
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SUBASE, BANGOR OPERABLE UNIT 4
U.s. Navy CLEAN Contract
Engineering Field Activity, Northwest
Contract No. N62474-89-D-9295
. ero .0039
N11J
NUWES
OU
PAH
PCB
PCB
PGDN
ppb
ppm
ppt
RA
RDX
RID. .
. RI .
RI/FS
RME
. SARA
SB
SD
SF
SS
. SUBASE
. SVOC.
SW
TAL
TBC.
TCE
TCL
TIC
!NT
'UCL
UF
URS
p,g/L
VOC
3039O'1940S.121 \ROD
Rccord of.Decision
Date: 05/31/94
Page v
ABBREVIATIONS AND ACRONYMS (Continued)
nephelometric turbidity units
Naval Undersea Warfare Engineering Station
Operable Unit
polycyclic aromatic hydrocarbon
polychlorinated. biphenyl. .
tetrachloroethene .
propylene glycol dinitrate "(Otto fuel)
parts per billion
parts per million
parts per trillion
risk assessment
Royal Demolition Explosive (cyclonite or
hexahydro-l,3,5-trinitro-l,3,5-triazine)
reference dose . .
. remedial investigation
remedial investigation/feasibility study
reasonable maximum exposure
Superfund Amendments and Reauthorization Act of 1986
soil boring
sediment
slope factor
surface soil
submarine base
semivolatile organic compound
surface water
target analyte list
to be considered
tetracbJoroethene
target compound list
tentatively identified compounds
trinitrotoJuene
upper confidence limit
uncertainty factor
URS Consultants, Inc.
microgram per liter
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SUBASE, BANGOR OPERABLE UNIT 4
U.S. Navy CLEAN Contrad
Engineering Field Activity, Northwest
Contrad No. N62474-89-D-929S
ero 0039
. Record of Decision
Date: 05/31/94
Page 1
DECISION SUM:MARY
1.0 INTRODUCTION
Under the Defense Environmental Restoration Program, the United States Navy's
(Navy's) policy is to address contamination at insta1l;itions in a manner consistent with
the requirements of the Comprehensive Environmen~ Response, Compensation, and
Liability Act (CERCIA), as amended by the Superfund Amendments and
Reauthorization Act (SARA), because the sites addressed have been listed on the
National Priorities List (NPL). In the case of Operable Unit 4 (OU 4) at the Naval .
Submarine Base (SUBASE), Bangor, the Navy's evaluation of potential adverse effects .
on human health and the environment indicated that risks at the sites are within the
United States Environmental Protection Agency's (BPA's) acceptable risk range for
current and future uses.
2.0 SITE NAME, LOCATION, AND DESCRIPTION
SUBASE, Bangor is on Hood Cana1, in Kitsap County, Washington, approximately 10
miles north of Bremerton (Figure 1). Land surrounding SUBASE, Bangor is generally
undeveloped or supports limited residential use. Naval activities began at Bangor on
June 4, 1944, when the United States Naval Magazine, Bangor was officially established
as a Pacific shipment. point for. 3D1:1Dunitio~ and explosives. When World War n ended, .
the Naval Complex became available for the storage of ordnance. .
On August 10, 1945, the activity was officially commi~sioned as a U.S. Naval Magazine
Facility, and, on December 1, 1947, the activity was redesignated the Naval Ammunition
Depot (NAD), Bangor. Several times during its history NAD, Bangor was consolidated
with Naval Torpedo Station (NTS), Keyport. In 1952, it returned to independent status
and became the United States Naval Ammunition Depot (NAD), Bangor. During the
. late 19608, conventional weapons used in the Vietnam War were loaded on ships from
the Bangor Marginal Wharf. NAD, Bangor was responsible for about one-third' of all
Naval weapons sent to Vietnam from 1965 to 1970. In October 1970, NAD, Bangor was
ordered disestablished and residual functions consolidated with Naval Torpedo Station
(NTS), Keyport. No munitions were shipped from NTS, Keyport between 1970 and early
1972. When bombing runs were stepped up in Vietnam, NAD, Bangor returned to
. active status. The last shipment to Vietnam was loaded in January 1973.
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'MAP B AREA
SUBASE,
BANGOR
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WASHINGTON
+
NORTH
o
3000 6000
ScIIIIn Fell
CLEAN
, COMPRBiENSIVE
LONG-TERM ENVIRONMENTAL
-, ACTION NAVY
CTOOO39
Operable Unit 4
SUBASE,Bangor
Washington
RECORD OF DECISION
. Figure 1 .
Site Location and Geographic Setting
~
9
~
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SUBASE, BANGOR OPERABLE UNIT 4
U.s. Navy CLEAN Contract
EDgiaeering Field Activity, Northwest
Contract No. N62474-89-D-9295
ero 0039 .
Record of Decision
Date: 05/31/94
Page 3
On November 29, 1973, the Secretary of the Navy announced that the Bangor Naval
complex had been selected as the West Coast home port for the Trident Submarine
Launched Ballistic Missile System. SUBASE, Bangor was commissioned in February
1977, and the first submarine arrived in August 1982.
. In July 1987, Site A, lOCat~d at the northem. end. of the base, was listed on the EPA's
National Priorities list (NFL) of hazardous waste sites. On August 30, 1990, the
remainder of the SUBASE, Bangor facility was listed on the NPL .
3.0 SITE HISTO~Y
Located in the northern portion of SUBASE, Bangor OU 4 is composed of Sites C-East
~d C- West, collectively referred to as Site C (Figure 2). Site C-East is the former
diSpOsal area for demilitarized ordnance wastewater and sludge. Site C-West contains
the. only' permanent structure on Site C, Building 7700. Site C-East is at the intersection
of Flier, Darter, and Pogy Roads. Site C-West is west of Site C-East, along Flier Road.
During construction of Building 7700, a portion of a leachate disposal pit at Site C-East
was used as fill material. The fill material was thought to be cont~m;nated with
ammonium picrate and was excavated and moved near its original.location.
Confirmation sampling was performed at Site C- West to ensure that all potentially
contaminated soil was taken back to Site C-East
As reported in the initial assessment stUdy (tis. Navy 1983), wastewater and sludges
produced during demilitarization activities at NAD, Bremerton Annex were periodically
brought to Site C-East for disposal between 1946 and 1957. This disposition could not
be independently confirmed during historical search efforts. The demilitarized waste was
believed to include ammonium picrate and a variety of projectile dyes, including
Alphazurine B, Alphazurine 2G, violet BG, crimson R, and wood yellow extra (U.S.
Navy 1983). The wastewater and sludges were trucked to Site C-East and disposed of in
two unlined leachate pits. The pits had been excavated in the relatively permeable
V~hon Recessional Outwash sands and gravels.
Between 1957 and 1964, NAD, Bremenon Annex-now named Jackson Park-
demilitarized approximately 4,000 projectiles. Demilitarization consisted of the removal
of ordnance from the projectiles. The projectiles were steam cleaned to remove residual
picric acid. The resulting wastewater, estimated at 1 million gallons (with an estimated
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+
NORTH
o
-----
-----
CLEAN
COMPREHENSIVE LONG-
TERM ENVIRONMENTAL
ACTION NAVY
Figure 2
Site C
Site Map
CTO 0039
Operable Unit 4
SUBASE, Bangor
Washington
RECORD OF DECISION
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SUBASE, BANGOR OPERABLE UNIT 4
U.s. Navy CLEAN Contract
EogiDccriDg Field Activity, Northwest
Contract No. N62474-89-D-9295
ero 0039
Record of Decision
. Date: 05/31/94
. Page 5
concentration of 10 gm/L of picric acid), is believed to have been disposed of in the
unlined leachate pits at Site C-East (Hart Crowser 1989).
From 1964 to 1971, Site C-East was inactive. In 1971, an oil-water separator was
installed and the site was reopened for the treatment of wastewater contaminated with
Otto (torpedo) fuel. The separator was adjacent to the leachate pit. The fuel waste
. ,removed from the wastewater by the separator was placed into storage containers.
These containers were later removed from the site. The residual wastewater was then
discharged from the separator onto the site. The location of the wastewater disposal
area is unknown but it is assumed to be one or both of the pre-existing leachate pits.
Documentation is not available on the oil-water separator's effectiveness during
operation.
.In 1977, a contractor excavated soils from the leachate diSposal pit area while
constructing Flier .Road. Some of this excavated material was transported from,
Site C-East to Site C-West and Used as fill. Shortly thereafter, during a wet period,
yellow-tinted 'water was observed leai'hing from the fill material. Chemical analysis ,
confirmed the presence of ammonium picrate and Otto fuel in the leachate. The
material was removed from Site C-West and returned to Site C-East.
In 1978, a curtain drain, a road underdrain (collectively referred to as the underdrain
system), and two carbon, filter units were installed in Site.C.;.East to treat surface water
that had been contaminated. The locations of these filter units are shown on Figure 2.
The carbon filter System was deactivated in December 1982 when influent concentration
levels had fallen to low levels. Data ~ysis was conducted by the Navy at the Naval
Uridersea Warfare Engineering Station (NUWES)~ Keyport, Washington. Water samples
were tested for Otto fuel, ammonium picramate, and ammonium picrate. The east
carbon filter influent levels for the last 6 months of operation were 0.13 to 0.40 ppm for
Otto fuel, less than 0.05 ppm for ammonium picramate, and less than 0.05 to 0.28 ppm
for ammonium picrate. The west carbon filter had concentration levels of less than 0.001
to 0.62 ppm for Otto fuel and less than 0.05 ppm for ammonium picra.mate and
ammonium picrate (URS 1993).
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It
SUBASE, BANGOR OPERABLE UNIT 4
U.s. Navy CLEAN Contract
Engineering Field Activity, Northwest
Contract No. N62474-89-D-929S
ero 0039 .
Record of Decision
Date: 05/31/94
Page 6
4.0 PHYSICAL CHARACl'ERlSTICSOF OPERABLE UNIT 4
4.1
SURFACE WATER HYDROWGY
4.1.1 Site C.East
. . .
At She. C-East, springs occur in the wetland area immediately west of Flier Road, where
the perched aquifer surfaces near the surface drainage area are adjacent to Flier Road.
In 1978, an underdrain and a carbon filter system were installed at Site C-East
(Figure 3). The carbon filters were removed from service in 1982, but the road subdrain
is still present. On-site flows of surface water are intercepted by the underdrain system
and are subsequently discharged northwest of Site C-East. According to previous
investigations. (Hart Crowser 1989), the streams discharging at this point appear to flow
. continuoU:SlY during January through May at an average rate of 0.04 cubic feet per.
second (cfs).
4.1.2 Site C.West
The principal surface water drainage feature at Site C- West is an ephemeral stream that
enters the site from the southeast (Figure 3). This drainage flows southwest near .
Building 7700 and then discharges into . Hunter's Ravine. An ephemeral stream drainage
west of Site C-West flows west to Hunter's R.vine. .
Storm-related surface water discharges frQm Site C-East appear to be minor, indicating
relatively high infiltration rates for the permeable near-surface soils. Much of
Site C- West is paved, and flow is diverted to ditches or drains along Flier Road.
Additibnally, the low permeability Vashon Till is exposed at the surface in unpaved
portions of Site C- West.
. Small seeps were observed approximately 20 feet downslope in Hunter's Ravine south of
Site C-West at the approximate locations shown on Figure 3. The flow rate from the
seeps was visually estimated at 0.1 gallons per minute (gpm). The presence and location
of seeps tend to confirm the stratigraphic interpretation that the shallow aquifer outcrops
in the slope face of the ravine. .
-------
~
. .. - ~h. fENCE
111111111 PARKING lOT
PAVED ROAD
:::::::::::::::: GR A VEL ROAD
.:::-==-::-~~~=:. DIRT ROAD
PERENNIAL STREAM
-.....-.-.- EPHEMERAL STREAM
>-< CULVERT
( .~./
$ ~
~
..........
I
..
118
+
N 281000
~ .
-.-.-.-.- APPROXIMATE.
SITE BOUNDARY
;£J SEEP
. . . MrlANDS:
~ AQUIFER DISCHARGE AREA
. --- APPROXIMATE CONTACT
or Qvr /Qvt
~ ~
o
- - - - .
- - - - -
..CLEAN
COMPREHENSIVE LONG-
TERM ENVIRONMENTAL
ACTION NAVY
Figure 3
Site C ..
Surface Water Drainage
eTe 0039
Operable Un" 4
SUBASE, Bangor
Washington
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.
SUBASE, BANGOR OPERABLE UNIT 4
U.S. Navy CLEAN Contract
Engineering Field Activity, Northwest
Contract No. N62474-89-D-9295
era 0039
Record of Decision
Date: 05/31/94
PageS
4.1.3 Stream Sediments
Upstream sediment samples at Site C-East consist of medium-brown, coarse-grained sand
. with gravel, silt, and minor organic debris. Downstream, where stream velocity
decreases, sediments consist mostly of dark-brown, fine-grained, humic-rich material.
. Sediments along Flier and Darter Roads consist mostly of silt, with some sand and trace
organics. The ephemeral stream sample west of Site G.West consists of.dark-brown-to-
black organic humus and silt. SampleS from the wetlan~ area at Site C-East consist of
well-sorted sands with little organic material.
4.2
SITE HYDROGEOLOGY
Four geologic units have been identified at Site C. These units are the Vashon
Recessional Outwash, Vashon Till, Vashon Advance Outwash, and the IQ.tsap Formation.
The designation "Vashon" distinguish~' those .units deposited during the latest glacial .
advance. The KitsapFormation is a lacustrine deposit that was famed during an . .
interglacial period and is generally distinguished by high organic co~tent.
The aquifers characterized through the RI/FS field activities at Sites C-East and C-West
are the perched aquifer, found only at Site C-East, the shallow aquifer found at both
. Sites C-East and C-West, and the intermediate groundwater zones, found only at
Site C-West. Groundwater flow direction for Site C is shown in Figure 4. The aquitards
identifieq in the study areas are ~e yashon rill, which. separates the perched (where
present) and shallowaqWfers, and the iGtsap Formation, which underlies the shallow
aquifer and hosts the intermediate groundwater zones. Although these units are
generally characterized as aquitards, zones within the aquitards are composed of
permeable, unstratified grave~ sand, and silt.
The site-specific characteristics of the geologic units encountered during remedial
investigation (RI) field activities are described in Sections 42.1 through 42.4. .
4.2.1 Vashon Recessional Outwash
The Vashon Recessional Outwash contains the perched aquifer in the shallow subsurface
at Site C-East. This unit is not present at Site C-West. The contact between the Vashon
Recessional Outwash and the Vashon Till surfaces in the wetland area separating
Site C-East and Site C-West and represents the boundary of the wetland. TheVashon
-------
~ FENCE CJ
~'PAVED PARKING LOT
PA VED ROAD
= = = = = GRAVEL ROAD
::.:::::::::::::: DIRT ROAD
-. -. -. - UNDERDRAIN SYSTEM
. . . .
. . . WETlAND AREA - - - APPROXIMATE' .
. . GRouNDWATER FLOW DIRECTION $ITE BOUNDARY
:,..1 ,'.
.".; " '"
. . -.
°0: .
, ,
I : :
lif
. .
, .
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:: ".."
. ,
: .
. .
,. :"'"
i ;" "":::::. .:.
+
NORIH
150.
o
- - - - .
- - - - -
. CLEAN
COMPREHENSIVE LONG-
TERM ENVIRONMENTAL
. ACTION NAVY
Figure 4
Site C .
Shallow Aquifer Groundwater Flow Direction
eTO 0039
Operable Un" 4
SUBASE, Bangor
Washington
-------
.
SUBASE, BANGOR OPERABLE UNIT 4
U.5. Navy CLEAN Contract
Engineering Field ActMty, Northwest
Contract No. N62474-89-D-9295
. ero 0039
Record of Decision
Date: 05/31/94
Page 10
Recessional Outwash ranges from approximately 10 feet to 30 feet in thickness in wells .
installed at Site C-East, with a perched aquifer saturated thickness ranging from 3 to 5
feet. The outwash material consists of a brown-to-gray unconsolidated fine-to-medium-
grained silty sand with varying amounts of gravel.
Groundwater in the perched aquifer flows west to northwest. The water levels in the
aquifer vary from approximately 3 feet below groUnd. surface (bgs) during the seaSonal
. low in September or October to 6 feetbgs during the seasonal high in February.
4.2.2 VashoD Till
.The Vashon Till is immediately below the surface of Site C-West. At Site C-East, the
Vashon Till underlies the Vashon Recessional Outwash. The Vashon Till varies from
approximately 10 to 20 feet thick at Site C-East and from 25 to 50 feet thick at
Site C-West. . The till consists of a very dense to a dense, dry, poorly sorted mixture of
sand, gravel, silt, and clay. Wi~ the till are moist to wet zones. of unconsolidated sand,
silt, gravel, and peat. .. . .
The response of the water levels within the Vashon Till is similar to that of wells within
the shallow aquifer, indicating possible interconnection. Groundwater levels vary up to 8
feet. The seasonal high is in February, and the seasonal low is in October.
4.2.3 VashoD Advance Outwash
Site C-East. The Vashon Advance Outwash is found beneath the Vashon Till at
Site C-East. It ranges in thickneSs from'approXimately 45 to 90 feet. A.lens containinf
peat, silt, and .clay was observed within the Vashon Advance Outwash during drilling of
wells in the Vashon Advance Outwash at Site C-East This silt/peat lens. ranges in
thickness from less than 6 inches up to 20 feet and was encountered under portions of
Site C-East. lithology ranges from a peaty silt to a sandy silt with peat and to a sandy
silt with minor interbeds of silt. The peat material in this lens consists of dark, carbon-
rich plant material and woody fragments. The silt and peat lens was in the uppermost
pornoll of the Vashon Advance Outwash at well CE-MW28/CE-MW29 (Figure 5) and
was present as an interbed in the middle portion of the Advance Outwash at other areas
of Site C-East. The silt/peat lens was not found at well CE-MW26 on the eastern
ponion of Site C-East. The peat/silt lens thins from east to west across Site C-East and
is present only as interbeds at wells CE-MW32 and CE-MW33.
-------
\
:>
10
-
J .
...
...
... ...
... ...
... ... ...
... ...
...
...
... . "
CLEAN
~PREHENSIVE LONG-
TERM ENVIRONMENTAL
-. ACTION NAVY
-
. .
...
\
\ / ~/
\/ rz.'{;
+
o
o
o
0)
I"')
fI')
-
....
200' 100.
-----
-----
Figure 5
Site C-East
. Monitoring Well Sample Locations
0+
NORn4
CTOOO39
Operable Un~ 4
SUBASE, Bangor
Washington
-------
..
SUBASE, BANGOR OPERABLE UNIT 4
U.s. Navy CLEAN Contract
Engineering Field Activity, Northwest
Contract No. N62474-89-D-929S
ero 0039
Record of Decision
pate: 05/31/94
Page 12
A clay lens was observed at the bottom of well CE-MW36; it was identified as the Kitsap
Formation at the time of drilling. Because of the differences in the elevation of the top
, ,of the Kitsap Formation observed at nearby wells, it has been identified as a clay lens
and probably represents a gradational contact between the Vashon Advance Outwash
and the Kitsap Formation. The extent of this clay layer is unknown.
Site C-West. The Vashon AdvanCe Outwash lies below the Vashon Till at SiteC-West
and ranges in thickness from 10 to 17 feet. The Vashon Advance Outwash was
encountered at-elevations between 93 feet and 100 feet msl. At Site C-West, the Vashon
Advance Outwash is composed primarily of gray to brown sandy silts and silty sands with
varying amounts of gravel. Zones of silty, sandy gravels and sandy, gravelly silts were
observed in the upper portion of the aquifer at wells CW-MW29 and CW-MW31
(Figure 6), which may represent a gradational contact between the Vashon Advance
Outwash and the Vashon Till.' , '
Using calCUlations from the januarY through December 1992 water level data, the
potentiometric Contours at Site C-West 'indicate ~ppro~mate horizontal gradients r-tngjng
from 0.035 to 0.5 foot per foot (ft/ft) for the shallow aquifer. Gradients ranging from
0.029 to 0.036 ft/ft were calculated at Site C-West. A velocity of 18 feet per year was
calculated for the shallow aquifer by using these gradients. These gradients indicate that
groundwater flows northwest to west. -
4.2.4 Kitsap Formation
At Site C-East, the Kitsap Formation lies pelow the Vashon AdWnce Outw8sh' and is
composed of a hard, dark-gray to blue-gray, silty clay to clayey silt with traces of sand
and gravel. At Site C-West, the Kitsap Formation is composed of hard, blue-gray, silty
clay to clayey silt and is layered with a hard, dIy, brown, peaty silt and clay. The peat
material is composed of carbon-rich plant material with woody fragments.
Three zones of sand, gravelly sand, and silty sand, ranging in thickness fJ;'om
approximately 3 to 30 feet, were encountered within the Kitsap Formation. These
intermediate groundwater zones ~e the principal water-bearing unit in the Kitsap
FormarloD. '
At Site C-East, the Kitsap Formation was encountered at elevations ranging from 86 to
160 feet mean sea level (msl). At Site C-West, the Kitsap Formation was encountered at
elevations ranging from 84 to 88 feet msl. The thickness of the Kitsap Formation at
-------
... ...
... ... ... ... ...
... ... ... "'
... ...
~
-x-x- FENCE .
~ PAVED PARKING LOT
PAVED ROAD
= = = = GRAVEL ROAD
CLEAN
COMPREHENSIVE LONG-
TERM ENVIRONMENTAL
. ACTION NAVY
.
I
U)
"
~.
I
N 281000
...
~ ...
..... .
II) .. $'"
;;. . . ~ DIR~ ... ~1J?"'t..
. ..... ..........,~
. NEW MONITORING WEll~ ,,,\ .
o EXISTING MONITORING WELLS
- - - APPRO~IMATE SITE BOUNDARY
200' 100'
o
...
0'" ... ...
... g ... ...
~... ... ...
II)
... .... ... ...
w.... ... ...
+ ...
NORTH
.....
- - . - .
Figure 8. .
Site C-West
Monitoring Well Locations
ero 0039
Operable Unit 4
SUBASE, Bangor
WashIngton
-------
..
SUBASE, BANGOR OPERABLE UNIT 4
U.s. Navy CLEAN Contract
Engineering Field Ac:tMty, Northwest
Contract No. N62474-89-D-9295
CTO 0039 .
Record of Decision
Date:. 05/31/94
Page 14
Site C is unknown because no soil borings have completely penetrated the unit in this
area. Site C-East borings for wells CE-MW29, CE-MW31, and CE-MW33 were drilled
approximately 5 feet into the Kitsap Formation to verify contact between the Kitsap
Formation and the shallow aquifer. At Site C-West, the Kitsap Formation-Vashon
Advance Outwash contact was encountered in all of the borings drilled for the remedial
investigation/feasibility study (RI/FS).
5.0 HIGHLIGHTS OF COMMUNI'lY PARTICIPATION
CommUnity relations activities have established communication among citizens living
near the site, the Navy, EP A, and Ecology. The actions taken to satisfy the requirements
of federal regulations also. provide a forum for citizen involvement and input to the
remedial action decision.. .
A fact sheet, distributed to all persons on the mailinf list in 1992, discussed all federal
Facility Agreement (FFA) sites, history, and RI activities at Sites .C-East and C-West
(OU 4).
The specific requirements for public participation pursuant to CERCLA 1113 (k) (2) (b)
and 117(a) as in 42 U.S.C. 19617 (2), as amended by SARA, include releasing the
proposed plan for remedial action to the public. The proposed plan for remedial action
was mailed to all known interested parties on November 1, 1993. One public comment
r~ceived by the Navy concerned th~ proposed plan for remedial action at Operable
Unit 4.. It was submitted at the public meeting. The comment received and the ag~ncy
responSe is in the Rewonsiveness Snmmary (Attachment 1). The Proposed Plan for
Remedial Action; Naval Submarine Base, Bangor-Operable Unit 4; Kitsap County,
Washington (Navy 1993) was placed in the admi1ii"trative record and information
repositories. .
The admini"trative record is on file at:
Engineering Field Activity, Northwest
Naval Facility Command
1040 N.E. Hostmark Street
Olympic Place II
Poulsbo, Washington 98370
(206) 396-5984
3039O\940S.121\ROD
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..
SUBASE, BANGOR OPERABLE UNIT 4
U.S. Navy CLEAN Contract
EagineeriDg Field Activity, Northwest
Contract No. N62474-89-D-9295
ero 0039 .
Record of Decision
Date: OS /31/94
Page 15
The information repositories are located. at:
Central Kitsap Regional Ubmy
1301 Sylvan Way.
Bremerton, Washington 98310
(206) 377-7601
SUBASE, Bangor Branch Libmy
Naval Submarine Base, Bangor
. Bangor, Wa~hington 98315
(Base access required)
(206) 779-9274
Notice of the availability of the proposed plan and notice of a public meeting on the .
proposed plan and public comment period were published in The Sun (Bremenon) on
November 1, 1993,. in the Cominunity Style on November 3, 1993, in the north Ki~p
. Herald. on November 3, 1993, and in the Trident TrdeS on November 5, 1993. A public
comment period was held from November 1, 1993, to December 1, 1993. A public
meeting was held on November 9, 1993, at the Olympic View Commnnity Cub in .
Silverdale, Wa~hington. A total of 23 people attended.
~o SCOPE AND ROLE OF OPERABLE UNITS
Two. NPL sites ar~ at SUBASE, BaDgor. The BaDgor Ordnance Disposal Site A (OU 1)
was listed on July 22, 1987. On AugUst 30,1990, the remainder of SUBASE, Bangor
including an additiona16 operable units comprising 21 known or suspected hazardous
waste sites, was listed. This Record of Decision addresses one of these operable. units,
OU 4. OU 4 consists of two sites, Sites C-East and C-West, wbich are contiguous. .
OU 4 is the only operable unit at these sites and is upgradient of Site 26. Calculated
human and environmental risks associated with both sites are within the EP A's
. accep"table risk range and do not warrant further remedW action.
-------
..
Record of Decision
Date: 05/31/94
Page 16
SUBASE, BANGOR OPERABLE UNIT 4
U.s. Navy CLEAN Contract
Engineering Field Activity, Northwest
Contract No. N62474-89-D-9295
ero 0039 .
7.0 SUMMARY OF SITE CHARACI'ERISTICS
The Site C-East and C-West remedial investigation sampling activities included surface
and subsurface soils, groundwater, and sediments. The analyses included ordnance,
volatile organics, semivolatile organics, polychlorinated biphenyls (PCBs), organochlorine
pesticides, all compounds from the EP A target compound list (TCL), all analytes from
. the EPA target analyte list (TAL), metals, and water quality parameters. Table 1 is a
sample summary for an of Site C. Background sampling locations on the base were used
to establish naturally occurring gro~dwater and soil metal levels. The established
naturally occurriI1g levels were used to compare to levels found at . Site C-East and Site
C-West.. Background samples collected at SUBASE, Bangor included 10 surface soil, 50
subsurface soil, and 6 groundwater samples from the locations shown in Figure 7.
Background samples were analyzed for TAL metals to' establish natural background
concentratioDS. Background concentratioDS for organic compounds were assumed to be
zero.
Total subsurface soils
MODitoriDg wells
Soil boriDp
Surfa&:e soils
.SedimeDt"
.Total grouDdwa~
MODitoriDg wells
AbaDdoDed wells
Surface water
Table 1
Sample Summary for Site C
'.
5
s .
10
3
3
3
'3
6
6
15
"Sample Dumbers iDclude multiple sampliDg 1OUDds.
~ADalysis iDcludes rotal aDd dissolved metals.
Note: Jbis table !Sees Dot iDc:lude field duplic:ateS, matrix spike/matrix spike duplicate, trip blanks, or riDsate samples. .
- - Dot applicable . . .
-------
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!~. BANGOR 1
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NORTH
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3000
6000
ScIIt.. Felt
r'--
CLEAN
COMPREHENSIVE lONG
TERM ENVIRONMENTAl
ACTION NAVY
Figure 7
Background Well an.d Subsurface Soil Locations
CTOOO39
Operable Unit 4
SUBASE, Bangor
Washington
RECORD OF DECISION
MAPA
. -375,
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LEGEND:
SS4 8 IIackgound Surface Soil Sample l.ocaIion
BG02 S SacIt!1ound Weilocalion (GrcundwaIer and Subsurface Sail)
- P8\Ied Road
Dit Road
-------
SUBASE, BANGOR OPERABLE UNIT 4
U.s. Navy CLEAN Contract
EDgineering Field Activity, Northwest
Contract No. N62474-89-~9295
ero 0039 .
Record of Decision
Date: OS /31/94
Page 18
Background Surface and Subsurface Soils Data. Background concentrations for each
metal analyte were determined for surface soils and for each stratigraphic layer (Vashon
Till, Vashon Advance Outwash, and the Kitsap Formation) encountered during drilling
of the background wells BG01 and BG02. Data from 10 surface soil samples (0 to 05
feet) were used to determine the surfaCe soil concentrations. Soil samples from 0 to 25
feet at ,BG01 and 0 to 52 feet at BG02 were used to determine metals concentrations of
the Vashon'Till. Soil samples from 30 to 142 feet at BG01 arid from 60 to 222 feet at
BG02 were used to determine metals concentrations of the Vashon AdVance Outwash.
Soil'samples used to determine the metals concentrations of the Kitsap Formation were
from 150 to 232 feet at BG01 and from 230 to 262 feet at BOO. Analytes that were
undetected in a given sample were censored in accordance with MTCA (WAC 173-340-
740[7][g]).
Metal concentrations in the subsurface soil differ between the geologic layers, with
, consistently higher concentrations in the Kitsap Formation than in the Vashon
sequences. The high metals content in' the Kitsap Formation may directly correlate with
the high clay content and the baSic provenance of the materials deposited during thiS
period of time. Higher metals concentrations in groundwater samples from deeper
monitoring wells reflect the influence of the Kitsap Formation. .
Site'soil samples were compared with respective b~ound data. Four different strata
were identified across Site C; however, only the Vashon Till, Vashon Advance OutWash,
and Kitsap Formation can be compared with background data. The fill, Vashon
Recessional Outwash"and peat layers ~ncountered at Site C do not occur at the
background sample locations; therefore, no background samples of these units are
available. ", ' . ' .
Background Groundwater Data. Background groundwater concentrations for metals
were determined from three rounds of sampling from monitoring wells BGOI and BG02.
Background groundwater values were determined in a manner similar to that used for
background soils data. First, the undetected values were censored in accordance with
WAC 173-34o-720(8)(g). These data were then evaluated for the distribution type
(tognormal, normal, or neither), and the background values 'were determined, using the
same criteria as soils. Because there are only two background wells, with three samples
each, the data set is small. Therefore, when the calculated background value was greater
than any of the observed values, the background value was reduced to the maximum
observed value.
-------
.
SUBASE, BANGOR OPERABLE UNIT 4
U.s. Navy CLEAN Contrad
EnginecriDg Field Activity, Northwest
Contract No. N62474-89-D-9295'
ero 0039
Record of Decision
Date: 05/31/94
Page 19
7.1
SITE C-WEST
Site C-West sample locations and results are presented in the following section along
with the findings from the RIfFS. Tables 2, through 12 present the chemicals detected at
the site for each medium compared to risk-based screeniDg levels calculated by using the
assumptions and procedures. These tables show exceedances of potential applicable or
'relevant and appropriate requirement (ARAR) and background. If no ARAR exists,
then no exceedances were reported~ If no background exists for a chemical, then the
exceedance is for the ARAR only.
7.1.1 Surface Soil
A large portion of Site C- West was filled during the construction of Building 7700. The
fill observed in the borings at Site C-West during the RIfFS subsurface investigation
consisted of an orange to yellow, well-soned sand. The fill ranged from 8 to 15 feet,
'thick within the fenced area and from 3 to 4 feet thick outside the fence and southwest'
of Building 7700. The fill 'area extends approximately 200 feet southWest of the building, , '
ending at the edge of the steep slope into Hunter's Ravine. Outside the fill area, the
surface soil consists of a dark brown silty sand to sandy silt. Outside the paved areas, a
layer of topsoil measuring from 1 to 5 feet deep contains various amounts of organic
debris within the soil.
Surface soil samples were collected at Site C-West, outside the paved area, and three
samples were collected from monitoring well locations CW-MW26, CW-MW30, and
CW-MW32. These samples were then analyzed for ordnance, TCL volatile organics,
semivolatile organics" pesticides, PCBS, and 'TAL metals. '
The following findings are presented for surface soil sampling.
Metals. Beryllium was detected above screeinng criteria concentrations in 12 surface soil
samples, with, a maximum concentration of 0.96 milligram per kijogram (mgfkg).
Manganese was detected above screening criteria in single surface soil samples, with a
. concentration of 1,040 mgfkg.
Organic Compounds. The volatile organic compounds (VOCs) detected included
acetone, methylene chloride, 2-butanone, toluene, xylene, and ethylbenzene. All of these
compounds were detected below screening criteria.
-------
.
SUBASE, BANGOR OPERABLE UNIT 4
U.s. Navy CLEAN Contract
Engineering Field Activity, Northwest
Contract No. N62474-89-D-9295
ero 0039
Record of Decision
Date: 05/31/94
Page 20
Table 2
Site C-West-Chemicals Detected in Surface Soil
-
ArseDic 11 11 0.83 6.8 2.44 10 3.69 0
Barium 11 11 31.2 106 59 5,600 134 0
Be!yUium 11 18 02S 0.96 0.57 0.233 A9 11
Calcium 11 11 1,300 4,220 3,264 - 3,%73 0
Ouomium 11 11 19.5 48.8 17.7 400 34 0
Cobalt 11 11 S.6 12.4 8.41 4,800 7.75 0
Copper 11 11 6.6 15.8 1U 1,960 16 0
IroD 11 11 9,800 12,300 14,741 16,958 0
Lead 21 11 1A 16A 5.3 - 31.8 0
MagDesium 11 11 2,040 5,530 3,839 - 4,033 0
21 . 11 165 1,040 364 400 1,002 1
Nickel . 21 11 21.9 51.3 36.8 1,600 63.3 0
Pot8aium 11 3 4TI 48S 461 338 0
SiMr 11 1 . 1.7 1.7 1.7 2AO .97 0
Sodium 21 21 86.9 288 145 476 0
rvuadium 11 21 23.S 63.S 44 S60 35.7 0
Zinc: 11 21 18.2 40.6 16.9 22,400 38.4 0
...: .." :.'" g~fNW~~*'~AW1'" h: '~' ~., .'. m~:!mR'WgW!i.€MmWJJ%*m::t&~@W,,-:/tm~~%£4t'%-M~J
2;6:""":""'~>"-""""-"~~ w "',.»>". i~ ,.<.,..~ I '~0i343'hYry.",~-~ »,y~,.,. .",«" »:'.'.. 0 .'~'.' !!
I;;.:.":...;;.:.:....:..,,,,>:.:.:.....:.,':.:::.:..:,:.:.:"..;:.;~w;~-;..' ',...".-. :,':.. _;;~-i~i;:~,~~~~.;»:;....;,:«;;.>:;:';.;'::¥!:J.;%::'.~...>:,:,~...',~?--
BeDzoic: acid 11 1 033 033 033 320,000' 0
l'yreDe 11 1 0.11 0.11 0.11 1,400' 0
b' exyI) phtbalate 10 1 G.18 OA1 0.3. 71.4 . 0
.':". ".:...."..,~".,..., ,..:.,.". y,,:~..,. "'~i&.Wl:tMIMWH.:$MtW[M%w.m~if,.~*?:iW:;~~;f.
-------
,SUBASE, BANGOR OPERABLE UNIT 4
U.s. Navy CLEAN Contract
Engineering Field Activity, Northwest
Contract No. N62474-89-D-9295
ero 0039
Record of Decision
Date,: 05/31/94
Page 21
Table 3
Site C.West-Chemicals Detected in Construction Fill
"
. ',".',',',''';''':..''
31 31 7,610 20,300 10,854 - 0
31 30 U 14.4 1.87 . 20 0
31 31 31.9 64.4 43.6 5,600 0
31 17 G.24 0.53 0.382 o.m 17
31 31 1,3S0 7,460 2,919 - 0
31 31 18.3 70.5 25.6 400 0
31 31 6.1 12.6 7.95 4,800 0
31 31 5.1 20.3 10.8 2,960 0
31 31 9,840 24,600 13,101 - 0
31 31 1.2 6.3 2.16 - 0
31 31 2,S2O 9,340 4,647 - 0
31 31 147 376 213 400 0
31 31 2S 72.3 39.6 1,600 0
31 31 2QS 480 347 - 0
31 31 70.7 189 136 - 0
31 31 23.5 82.2 34.5 S60 0
31 31 16.3 37.6 24.2 22,400 0
~h_1
2,4,6-TriDitrotolueae 33 2 .Q21 .1875 .104 33.3 0
2,4-DiIIitrotolucuc 33 1 .0297l .DZ971 JJ1!J7 lA7 0
Picric: acid 31 1 0.0069 o.D069 o.D069 - o.
r::. .",' "<"~'~.:'.:::, ,:~,,,~~r;l, ,~~ 1';<>Wo "~':::13' "~~~ ..,'~~. '::~;;':"1~h"' ::,. ,:" '~I
~~~~'~=$*~='&~'~~~<~*=« ,~.,'" ,.,. -=, .. " ,.' 4~'*'i~tl,:",.~~ -~:~-~Th~,~~:~~,~~~*,.;:=J1
,,"':'..'.. "'."" '....... ....... ~~~"::~~-:~~~~~~::-:~:':.::~~::~mm~:~:::~:::: -:::::':::~~~::x,:~:t:-::::.~:~:$::~::::*~~::i':~~~*l~~ m@:'(~',«"'~~"::':' ,''''Yf-"'(o:' ':-:"""~'.1mI1
z"ButaDOIIc 31 3 .011 .042 .DZ43 48,000 0
AcctOllc 31 11 .011 .23 .0626 8,000 0
Methylenc chloride 31 13 .001 .004 .00184 133 0
ToluCllc 31 1 .001 .001 .001 16,000 0
.J8Et'\.9F'"
AIummum
AlscDic:
Barium
BezyIlium
CIlcium
CIIIomium
Cobalt
Copper
lIOII
Lead
Mapcsium
Mallpllcse
NicteJ
Potassium
Sodium
Vuadium
ZiDc:
':' l~t *" '~"" "'Wi
"''', "".."" ':~w:' "w<~"*':" '~w:r~'
~w. . ':$: '::;:'-;'» "~ .' .;:~ ~~;. ."'''' ':;:" ,"
"x.:'.~'"
.,
~,
...,.. .".......'
,
~ . .
ARAR - applicablc or relCYaDt and appropriate requiremcllt
mg/kg - milligram per kilogram
- - lIot applicablc
. - background established as zero
-------
Record of Decision
Date: 05/31/94
Page 22
SUBASE, BANGOR OPERABLE UNIT 4
U.s. Navy CLEAN Contract
Engineering Field Activity, Northwest
Contract No. N62474-89-D-9295
ero 0039
Table 4
Site C-West-Chemicals Detected in the Vashon Recessional Outwash SOU
~~\"'t~?f.~1M~~llli~~i;: .~~
Alummum
AJseGic
Barium
BayUium
Calcium
CIromium
Cobalt
Copper
boll
Lead
Mapesium
MaDpuesc
Nickcl
Potassium
Sodium
'I1IaIIium
Vaadium
ZJDc
44
44
44
44
44
44
44
44
44
44
44
44
44
44
44
44
44
44
w
RDX
PicIamic acid
Picric acid
42
3S
3S
.. ...
.., .. ... ,,' "'::"''$.'" y
,.... ','n
""i:'~*._L '::m:~~~.£~1~mK
44 5,280 94,600 l2,S57 - 0
44 0.59 4.8 1.69 20 0
44 19..5 104 41.2 5,600 0
2S O~ 0.95 0.514 0.233 2S
44 1,730 7,810 4,314 - 0
44 14.2 53.9 26.4 400 0
44 5 19.6 9.34 4,800 0
44 2.7 so.s 15.6 2,960 0
44 7,410 31,200 14,604 - 0
44 0.78 7.5 2.06 - 0
44 2,600 l3.1oo 5,381 - 0
44 139 522 248 400 4
43 21.3 91.1 41.6 1,600 0
43 193 1,700 446 - 0
44 85.9 1,510 314 - 0
1 0.42 OA2 0.42 5.6 0
44 20.6 75.2 39.5 S60 0
44 17.8 74.8 rJ.6 22,400 0
, .->.%:.
,
;
9.09 0
- 0
- 0
2
1
2
0.02A39
0.002
OJlOS3
0.QZS67
O.ClO2
0.0075
0.025
0.CI02
G.OO64
" ....... ",'
,- ',',',"','."
.- . ..... .........
.... .... .- .. . ,- .. " ... :""*"
''-'...~... ..', ~h'o. "'''''''''-J'h" . . ~ . . " N....~.. ....;0 ~~ .... .,: -,
4-MctbyIpbcDol 42 1 0.23 0.23 0.23 4,000 0
Beazoic acid 42 1 0.14 0.14 0.14 320,000 0
~hthalatc 43 3 0.14 0.17 0.156 1,600 0
Bis(2-etllylbcxyl) phtbalatc 43 8 .D82 1.5 .3SS 7L4. 0
_1:..%x~!"?!.:; .,.~~:~.::<;< .~*': ::i.::¥'k.'''-~~h~~''jfi~~IDitMtW:$.l\~W#~mmmw¥mt*$.$iw.Wi$':t$m_\:.%.#.~:i.'W
2-ButaDODC 43 3 JXJ7 .024 .014 48,000 0
AcetoDc 43 8 .004 .096 .028 8,000 0
EthylbeDzcDC 43 2 .002 .002 .002 8,000 0
Methylenc chloridc 43 4 .001 .001 .001 133 0
Tolucl)c 43 1 .002 ..002 .002 16,000 0
Xylcncs 43 1 .001 .001 .001 165,000 0
Notes:
ARAR. - applicablc or relevant aDd appropriate requiremcnt
mg/kg - milligram per kllogram
- - Dot applicable
. - backgrouDd established. as zero
-------
SUBAS~ BANGOR OPERABLE UNIT 4
U.s. Navy CLEAN Contract
Engineering Field Activity, Northwest
Contract No. N62474-89-D-9295
cro 0039
Record of Decision
. Date: 05/31/94
Page 23
Table 5
Site C.West-Chemicals Detected in the VashoD 1ilI SOU
I~':.
...
..
:~:~ ..$-~;~'
',",'"
,:.~....~..w.......~~~_\~i:~~mt:~~:~~n~ .~.. ;.' . ...~. .... ,t..»: m... 10 ~ ~"("~:':~~.:';:-. '.., ~ .:~~ "x.'~ ~.'. ~:o:: "';":' ~*l ..
AlumiDum 15 15 7,310 25,000 12,S4O . - 12,2S8 0
ArseIIic 15 15 1.5 9.1 .Z.58 . 20 1.65 0
Buium 15 15 29 102 49.6 S,600 S1.8 0
Berytlilllli 15 8 0.32 1.2 0.611 0.233 0.68 3
Calcium. 15 15 3,880 14,500 6310 4,282 0
Quomjum 15 15 193 SS.5 29.7 400 26.6 0
Cobalt 15 15 73 26.8 u.s 4,800 10.6 0
Copper 15 15 10.5 70.2 25.7 2,960 24.4 0
!roD 15 15 11,900 S2,8OO 21,700 - 15,816 0
Lead 15 15 1 16.4 4.13 - 1.97 0
Magnesium 15 15 4,3S0 12.,ZOO 7,588 6,415 0
MangaJle5e '15 15 20Z 484 Z96 400 311 4
I Mercuzy 15 2 0.15 OA7 0.31 24 O.os . 0
Nickel 15 15 31.5 56.4 42.4 1,600 76.9 0
Pocassium 15 15 384 1,750 748 - 490 0
Sodium 15 15 221 1,280 444 - 461 0
IVeadium 15 15 30.9 111 50.3 S60 36.9 0
Zinc 15 15 21.9 90.2 40.2 22,400 . 31.5 0
I
~trotoIllClle I 15 I 2 O.ou I O.ou I O.ou I lA7 . I 0
~,,:::::;;:.:,.::;.~....~MWWmWfMHiw:MillW@$.WlMm"%8w~.~~~W'~~t'~:~'i!h~\!H@,~~~1:@m%~:*1WWnt._E
Di-lMM:tylphtbaJate T 15 I 2 0.1 0.24 0.17 1,600. 0
bO...o -r ezyI) phthalate T 15 1 0.18 0.18 0.18 71.4 . 0
~.."., w...wA..,. ...w.,,:..X*:t*m1MW.m~:~'im~M:tif.i'%#M@1W??t:''W%=tWi.. ..: .;~~~%¥W¥~W~lliJA)'d:_':.@tWii'*%1lm' -~~'l~;::"!
2-ButaooDe 15 2 0.004 0.011 0.007S 48,000. 0
Acetone 15 5 0.D02 0.05 0.m.8 8,000. 0
JaCtbytcne chloride 15 2 0,001 O.D01 0.001 133 . 0
Notes: .
ARAR. - applicable or relevaDt ud appropriate requiremCllt
mg/q - miIJigr8m per kilogram
- - Dot applicable
. . backgrouad established as zero
-------
~
SUBASE, BANGOR OPERABLE UNIT 4
U.s. Navy CLEAN Contract
Engineering Field Activity, Northwest
Contract No. N62474-89-D-9295
ero 0039
Record of Decision
. Date: 05/31/94
Page 24
Table'
Site C-West-Chemicals Detected in the VashoD Advance Outwash Soil
Aluminum Zl 'Zl 10,800 rT,700 14,094
ArlcDic Zl 20 1.2 12.1 20 5.1
Barium Zl Zl 19A 108 5,600 76.6
BayIlium Zl 11 0.61 1.4 0.233 0.58
CaJcium 21 21 5,260 10,600 8,458
Ouomium Zl Zl 28.7 58.2 400 41.8
Cobalt 21 21 11.2 20.7 4,800 14.7
Copper 21 Zl 18.4 60.2 2,960 29.4
IroD 21 . 21 17,600 38,SOO 22;928
Lead 21 Zl' 1.6 13.3 3.94
Mapesium 21. 21 6,S?O 14,400 13,460
MaDpuese. Zl Zl 24S 44S . 400 386
Mcmay Zl 1 0.16 0.16 24 0.06
Nickel Zl Zl 26.2 64.4 1,600 91.8
Potaslium Zl 18 291 1,980 1,236
Sodium Zl Zl 121 S60 450.6
Vuadium Zl Zl 40.6 90.3 55.7
7mc Zl Zl 45.7 89.7 46
I,3,S-TriDitrobCDZeDc
NitrobcucDe
oao fuel
Di-D-butylpbtbalate
~EtbyIhexyI) pbtblJate
Zl
Zl
~~~~ '.$~~.. .:::.
':0.','..''''''',',',,,,,,,-,,,
,'.' d.N!$>.
::.tW:f.g~::::::::.:.:::{:~~~~:~t:... ~;"': .
2-ButaDonc
AcctODc
MctbyleDc cbIoride
ToluCllc
XyleDCS
0.029
0.083
0.007
0.002
0.003
0.01
0.Q381
0.003
0.002
0.003
48,000
8,000
133
16,000
165,000
.
o
o
o
o
o
21
21
Zl
21
21
Notes: . .
ARAR - appiicablc or rclCYallt and appropriatc requiremcDt
1IIg/tg - miI1igram per kilogram .
- . Dot applicablc
. - backgrouDd established as zero
-------
SUBASE, BANGOR OPERABLE UNIT 4
U.s. Navy CLEAN Contract
Engineering Field Activity, Northwest
Contract No. N62474-89-D-9295
. ero 0039
Record of Decision
Date: 05/31/94
Page 25
Table 7
Site C-West-Chemicals Detected in the Intermediate Groundwater Zone SoU
2
2 .
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
. 16,600
4.3
88.1
0.86
6,460
42.2
9
19.3
13,600
3.S
5,320
209
20.4
284
23S
Q.6
30.6
26,300
4.4
91.3
1.2
7,79IJ
47.8
21.3
Q.3
44,900
15.5
13,000
486
S3.S
1.630.
403
84.7
103
~
5,600
. 0.233
. 0
o
o .
2
o
o
o
o
o
o
o
1
o
o
o
o
o
400
4,800
2,960
400
1,600
S60
22,400
..~':...::.:,.. Jgli::::J~tmiW&'Wl1W¥WH1%:g$.,%WMi:K&~'W,¥JR.%W_J_fh';Ij.JlWtlnMt*%~'tl1mHit,W&lgtWHk.~m_~
2-ButaDOIIe 2 2 0.021 0.054 D.0375 48,000 0
AcctoDe 2 2 0.0S8 0.15 0.104 8,000 0
.MethylClle chloride 2 2 0.001 0.002 o.cxns 133 0
Nota:
AkAR. - applicable or relevallt aDd appopriate requiremCllt
mg/kg - mil1ipam per tilognm
- - Dot applic:able
. - backgrouDd established as zero
-------
Record of Decision
Date: 05/31/94
Page 26
SUBASE, BANGOR OPERABLE UNIT 4
U.s. Navy CLEAN Contract
Engineering Field Activity, Northwest
Contract No. N62474-89-D-9295
era 0039
Table 8
Site C-West-Chemicals Detected in the Kitsap Formation SOU
Aluminum
AJscnic .
Barium
Calcium
Chromium
Cobalt
Copper
Lead
MqDesium
MaDpDesc
Memuy
Nickel
Sodium
Vauadium
. c
""""'."'" ......~:...:.....: ...............:..:~~::W:::::<: ~-::::~~$~-::'~'
2-ButaDODe
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
o
NoteS:
ARAR - applicable or relevaDt and "py'''I'.;ate requiremeDt
mg/tg - miIIipam per idiogram
- - DOt applicable
. - bactpow;Id established as ZCJO
-------
SUBASE, BANGOR OPERABLE UNIT 4
U.s. Navy CLEAN Contract
Engineering Field Activity, Northwest
CoDtract No. N62474-89-D-9295
ero 0039
Record of Decision
Date: 05/31/94
Page '2:T
Table 9
Site C-West-Chemicals Detected in Surface Water
Nares:
PIlL - miaogram per liter
- - Dot applicable
3a39O\!1405.121\TBL9
1
1
1
12
43
2.92
o
-------
SUBASE, BANGOR OPERABLE UNIT 4
U.s. Navy CLEAN Contract
Engineering Field Activity, Northwest
Contract No. N62474-89-D-9295
ero 0039 .
Record of Decision
Date: 05/31/94
Page 28
Table 10
Site C-West-Chemieals Detected in Smfac:e Sediment
??
.':"
,"
. .~ti::.B::" :
~.
.. ..
~.. !>
«~
~
~.~>..,:*,: .,.,m... '..'~~~*$W~:w;~w:m;:i'{%ttf~~t.@.~~~~ID;>..t;W>
RDX . 17 I 3 G.608 I 2.594 1.78
Picric add I 9 I 1 0.01764 I 0.01764 0.0176
....~.:.;... ..:.:...;...;~:.. 'oY..:.:.~:.;.:....~:...~.~it~i!Hf:Wi@g_ff.~m*?~r;fu_iif:ii%~~~~~~~~&¥j:mmitg;m&~lm$t~~*ft*.&"ggiitijlfii~fi:iij~~m~i
EDcSosuJfaD s~te 16 T 1 . 0.015 0.015 I 0.015
:.' :.:::.;,...;.::.,...:.:.. ",.>."%jMm:*W.~.$t1llilMlli1WllW-:*5nMWM1w@.t*ll~1MW1f¥.W.ffk&lWJWi?M';WN*W%lNi1ijlf.@tm;@1j~@W
4-Methylpbeaol ' 17 1 0.51 0.51 0.51
AceDapbtbene 17 2 0.28 1A 0.84
AceDapbtbylene 17 1 0.23 0.23 0.23
ADthratene 17 2 0.41 2 1.20S
Beazo(a)aatbracene 17 2 1.1 5.7 3.4
Beazo(a)pyreae 17 2 1.2 6.4 3.8
Beazo(b)f1uomatbeae 17 3 0.26 9.5 3.85
Beazo(g,b,i)petytene 17 2 0.33 0.92 0.625
8eDzo(k)f1uoraatbeae 17 3 OA3 3.9 1.62
Beazoic acid 17 4 0.096 0.580.251
CluyseDe 17 2 1.5 7.2 4.35
DibeDz(a,b)antbrac:ene 17 2 0.16 0.65 0.40
Dibenzofuran 17 2 0.18 0.97 0.575
fluorantbeDe 17 4 0.65 14 4.73
fluorene 17 2 0.43 2.5 1.46
IDdcno(1,2.3-cd)pyreDC 17 2 0.57 2.5 1.53
-------
.
SUBAS~ BANGOR OPERABLE UNIT 4
U.S. Navy CLEAN Coutract
EDgincering Field Activity, Northwest
Contract No. N62474-89-D-9295
ero 0039
Record of Decision
Date: 05/31/94
Page 29
Table 10 (Continued)
Site C-West-Chemicals Detected in Surface Sediment
2
2
2
1
0.004
0.014
0.075
o
Note: mg/kg - micropam pet kilogram
-------
.
SUBASE, BANGOR OPERABLE UNIT 4
U.s. Navy CLEAN Contract
RnginceriDg Field Activity, Northwest
Contract No. N62474-89-D-9295
CTO 0039
Record of Decision
Date: 05/31/94
Page 30 .
Table 11
Site C-West-Chemicals Detected in the Intermediate Groundwater Zone
80
148 0
3 2
21 0
17,200 0
o 0
162 0
12,600 0
176 6
4,940 0
12,'700 0
o
AIumiDum 11 1 28.7 28.7
ArseIIic 11 2 72 6.1
Barium 11 6 33.1 15.7
CIJcium 11 11 9,730 35,800 22,l3O
Copper 11 2 4 4 4
IroD 11 8 4S 4,840 2,318
MaPesium 11 11 3,6SO 15,200 8,445
MaupDese 11 11 35.1 414 214
Potassium 11 9 3,290 7;1.90 5,160
Sodium 11 11 6,S7O 19,'700 13,428
V~ium 11 4 6.9 19.4 13.7
.os
1,000
1,300
lU
.:.....:::.. ~.::::::::::'~~i1( ~~tfnl~~it@~J~i~i~1f&'~t~~.~ f*mm~.*ltfIM~~ili~1i_iflitn~~~!$~tmWffi~ .~:tJ~f$~iiftt~~l~lWji~~~.~~}.;~&ft~f.~l1~~~
Niaobem.eDe
Picric acid
DHMxtyIphtbalale
11
11
11
2
3
2
.
o
o
o
:~,:..:"~..:' :.:::N .~.:::::h:~'..V~~: j~~@tr._ffiW~'::'<."':<._..
PheDOl
bis(2-EtbyIh=yI)pbtba
11
11
:-...'.'~'.'.' N. """,',"'."':-:"'..',
AcetoDe
11
Notes:
ARAR. - applicable or relevant and appropriate requiremeut
fJfIL - microgram per liter
- - not applicable
. - background established as 0
3a39O\940S.121\TBL11
-------
SUBASE, BANGOR OPERABLE UNIT 4
U.s. Navy CLEAN Contract
Engineering Field Activity, Northwest
Contract No. N62474-89-D-9295
ero 0039
Record of Decision
Date: 05/31/94
Page 31
Table 12
Site C-West-Chemica1s Detected in Shallow Aquifer Groundwater
230
7.5
28.4
26,600
7.2
153
17,100
367
20.9
11,200
19,600
14.2
543
1,1,1-TrichioroetbaDe
Notes:
ARAR - applicable or relevant ud appropriate requirement
pgfL - miaogram per liter
- - Dot applicable
. - backgrollDd established as 0
3039O\940S. 12 I \TBLI2
112
3.94-
Z2..7
~,071
7.2
119
12,660
169
20.9
5,510
11,656
13:8
24
.OS
1,000
o
3
o
o
o
o
o
2
o
o
o
o
.0
592
80
100
162
32,SOO
176
4,940
12,700
112
4,800
15
-------
SUBASE, BANGOR OPERABLE UNIT 4
U.S. Navy CLEAN Contract
Engineering Field Activity, Northwest
Contract No. N62474-89-D-9295
ero 0039 .
Record of Decision
Date: 05/31/94
Page 32
Ethylbenzene, toluene, and xylene were usually detected together. These compounds are
commonly found in fuel hydrocarbons; proximity of sampling locations to the paved
roadway and parking lot make motor vehicles a likely source for these compounds. All
detections were below regulatory criteria; therefore, none of these compounds were
considered in the risk assessment as a chemical of potential concem .
" Bis(2-ethylhexyl) phthalate, benzoi~ acid, and pyrene were detected in isolated samples
below screening criteria. These samples were taken adjacent to an asphalt-paved road
and parking area, which may be the source of these compounds. . "
One .ordnance compound, 2,6-dinitrotoluene (2,6-DNT), was detected at a" concentration
below the screening criteria. This detection is within the suspected fill area on Site C-
We~ "
Pesticides and PCBs were not detected in Site C- West surface soils.
7~1.2 Subsurface SoDs
During July and August 1991, 21 soil borings were drilled at Site C-West; soil boring
depths ranged from 3120 ft mean sea level (msl) in CW-MW30 to 97.19 ft msl in CW-
MW27. All samples were drilled by using hollow-stem auger methods. Samples were
collected from the surface to total boring depth by using a 2-inch-diameter split spoon
"for visual cl~S$;fication. Fifty-four of the samples collected were classified as
r~presentativeand sent to an off-s~te laboratory for chemical analyses. Tables 3 through
8 show data for subsUrface soils.
In an attempt to locate the contact between the overlying fill and the V ashon. Till, three
of the 21 borings-SB-5, 5B-9, and 5B-tO-were drilled deeper than originally planned,
as specified in project work plans. Two of these-SB-9 and SB-10-reached auger
refusal at 215 and 235 feet, respectively. The third, SB-S, encountered the contact
between the fill and the Vashon Till at 30 feet. Samples in these deeper borings were
collected from 0 to 10 feet. Below lO feet, samples were collected for chemical analysis "
at lO-foot intervals. Three additional borings were drilled near SB-10 to dete~e the
limits of fill on the south side of Site C-West. Only samples collected between 0 and 3
feet below ground surface from these borings were shipped to a laboratory for ordnance
analyses.
30390\9405.121 \ROD
-------
SUBASE, BANGOR OPERABLE UNIT 4
U.s. Navy CLEAN Contract
EDgineering Field Activity, N~rthwest
Contract No. N62474-89-D-9295
ero 0039
Record of Decision
Date: 05/31/94
Page 33
Subsurface soil samples from 17 soil borings and four monitoring wells at Site C-West
were analyzed for volatile and semivolatile organics, pesticides, metals, and ordnance
compounds. Subsurface soil is defined as soil at a depth greater than 6 inches.
. .
The following are the findings for subsurface soils sampliilg.
Metals. Beryllium and manganese were commonly detected routinely at concentrations
above screening criteria throughout all geologic formations.
Beryllium concentrations exceed screening criteria in the fill area. No appropriate
background concentrations are available for the fill.
Organic: Compounds. VOCs detected were acetone, 2-butanone, toluene, ethylbenzene,
xylenes, and methylene chloride. All VOC detections were below screening criteria.
Semivolatile organic compounds (SVOCs) detected at Site C-West were bis(2-ethylbexyl) .
phthalate, pyrene, 4-methylphenol, benzoic acid, di-n-octylphthalate, and di-n. . .
butylphthalate..
Ordnance compounds detected at Site C-West include 2,4,6-trinitrotoluene, 2,4-
dinitrotoluene, 2,6-dinitrotoluene, picric acid, picramic acid, nitrobenzene, Otto fuel, and
Royal Demolition Explosive (RDX). All ordnance detections were below screening
concentrations.
. .
No pesticides or PCBs were d~tected ~ subsurface soils from C-West,
7.1.3 Surface Water and Sediment (Site C-West and Site C-East)
Sample locations C-SW /SDOI through C-SW /SD06 and C-SW /SDI2 were sampled once
during base flow (April 16 through April 23, 1991) and once after a storm event (August
29 through August 30, 1991). C-SW /SD07 was sampled only on~e because of lack of
surface water flow conditions. Sample locations for surface water and sediment for Site
C ~e shown in Figure 8.
Stormwater at Site C-East drains both to the wetland and then west and south of
Hunter's Marsh and also drains directly to the stream leading to Hunter's Marsh.
Stormwater at Site C-West drains to storm sewers within the paved area.
-------
\.,.;""
(
~
~
~I /
- .# .
~~/
V
I.
~
III
. .
N 281000
~
....
.rO SEEP
- - - APPROXIMATE
SITE BOUNDARY
4-- APPROXIMATE SURFACE
WATER RUN-OFF DIRECTION
SURF ACE WATER AND SEDIMENT
~ . SAMPLING LOCATIONS (POSITIONS
APPROXIMA TE) .. ,
.-)
-----
-----
CLEAN
COMPREHENSIVE lONG-
TERM ENVIRONMENTAL
ACTION NAVY
Figure 8
. SlteC .
Surface Water and S~lm~nt Sampling Locations
eTO 0039
Operable UnR 4
SUBASE, Bangor
Washington
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era 0039
Record of Decision
Date; 05/31/94
Page 35
Site C-East baseflow sampling was performed at C-SD08 in October 1991; storm event
sampling was performed at locations C-SDOS through C-SD11 in November 1991 and
again at C-SDOS in January 1992. Site C samples are compared to upgradient sample
stations (C-SD03 and C-SDOS). No screening criteria have been established for'
freshwater sediments. Ecology has presented sediment criteria from various North
American sources (Ecology 1991). Data are intended 'as guideline concentrations.
The following are the findings for surface water and sedlment sampling by class of
analytes.
Metals. 'Metals results are presented below.
Surftu:e WIlleT. No metals were d~tected at concentrations that exceed screening criteria.
Sediment. Samples C-SD03 and C-SDOS are considered upgradient upstream samp~g,
locations. C~SD12 is aD off-site 'sampling location, hydraulically unrelated to Site C.,
,Arsenic, barium, chromium, manganese, nickel, and zinc exceeded upstream
concentrationS at C-SD04, C-SDOS, and C-SD06 during round 1 sampling. Chromium
and zinc exceeded upstream concentrations at C-SD05 during round 2 sampling. Metal
concentrations remained above screening criteria during round 2 sampling at C-SD06.
Barium, nickel, and zinc were at concentrations above screening criteria during round 2
sampling at C-SD09. 'Barium, chromium, copper, selenium, and zinc were also detected
above upstream concentrations at C-SD10 during round 2 sampling.
Sainpling locations C-SD01, C-SD02, C-SD03, and' C-SD04 are in Hunter's Ravine.
Sampling location C-SDOS is in Hunter's Marsh, which is currently being investigated
under OU 7. The source of metal concentrations in sediment from Hunter's Ravine and
Hunter's Marsh is unknown; these sedimentS receive surface water runoff from a variety
of sources, including Site C.
Organic Compounds. Organic compound results are presented below.
Surfm:e Water. VOCs detected in surface water include, benzene, tetrachloroetherie
(PCB), toluene, and vinyl chloride. Vinyl chloride and tetrachloroethene exceeded
screening criteria one time each. Vinyl chloride was detected in surface waters at
C-SW06 (Figure 8) near the asphalt-paved parking area of Building 7700.
Tetrachloroetbene was detected at C-SW08, which is upgradient of Site C-East.
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era 0039. .
Record of Decision
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Page 36
Ordnance compounds detected in surface water runoff for Site C include 2,4-DNT,
2,6-DNT, nitrobenzene, l,3,5-trinitrobenzene, 2,4,6-trinitrotoluene, RDX, and Otto fuel.
These ordnance compounds were detected at concentrations below screening criteria.
Otto fuel was detected once off sit~ at C-SW09 in Hunter's Marsh. .
No SVOCs, pesticides, or P~s were detected in sUrface water at Site C.
. .
. Sediment. VOCs detected in sediments include acetone, 2-butanone, benzene, xylenes,
carbon disulfide, and methylene chloride. Acetone, benzene, and methylene chloride
were detected at upstream sampling location C-SD08. Acetone, 2-butanone, and carbon
disuJfide were detected in Hunter's Marsh, but were not detected at upstream sampling
locations in Hunter's Ravine. Methylene chloride was also detected at sampling
locations C-SDIO and C-SDll in the wetlands, downslope of Site C-East. Methylene
chloride was widely detected in soils at Site C-East. These VOCS are suspected to have
migrated from the source at Pit A or B through the perched aquifer, as the perched
. aquifer discharges into the wetland. With the exCeption of acetone, all VOCS were
detected during the stOnD event sampling. .
The source of acetone and 2-butanon~ in sediments of Hunter's Marsh may be from
surface water runoff or from groundwater discharged into Hunter's Ravine. None of the
VOCs detected are at levels of potential concern.
Several SVOCs were detected at low frequency in sediment samples at Site C (Tables 10
and 21). .
RDX and picric acid were the only ordnance compounds detected in sediments. They
were found at sampling locations C-SD12 and C-SD07 (Figure 8), respectively, during
baseflow conditioDS~ These ordnance compounds were below screening criteria and are
not considered compounds of potential concern. at Site C.
7.1.4 Groundwater
,
. Groundwater monitoring wells at Site C-West (Figure 6) were installed in four clusters
of two wells each. Monitoring wells CW-MW26 and CW-MW27 were upgradient of
Site C-West and downgradient .of Site C-East. Monitoring wells CW-MW28 and .
CW -MW29 were installed downgradient of Site C- West in the southwest portion of the
site. Monitoring wells CW-MW30 and CW-MW31 were also installed downgradient of
Site C-West, approximately 200 feet west of CW-MW29. These clusters were located to
-------
SUBASE, BANGOR OPERABLE UNIT 4
U.s. Navy CLEAN Contract
Engineering Field Activity, Northwest
Contract No. N62474-89-D-9295
, era 0039
Record of Decision
Date: 05/31/94
Page 37
provide data on the nature and extent of chemical compounds present in the subsurface
soil and groundwater and to establish groundwater flow directions and gradients. The
cluster containing CW -MW32 and CW-MW33 was installed north of Flier Road to
provide water quality data north of Site C-West and as a third point for determining,
groundwater flow direction.
One of the wells in each pair was completed in the upper shanow aquifer. The 'second
well was completed in the lower shallow aquifer In the Kitsap Formation.
Monitoring well installation was conducted in two phases. Monitoring wells CW-MW26
and CW-MW27 were installed between April and July 1991. Monitoring wells, ,
CW-MW28 through CW-MW33 were installed in November 1991. All monitoring wells
have 10-foo.t screened sections except well CW-MW26, which has a 5-foot screen because
the aquifer was determined to be less than 10 feet thick at that location.
Existing monitoring well C-MW25 was used to proVide additional data at Sit~ C- West.
, Well C-MW25 was screened in the Vashon Till; it is downgradient of well cluster
C-MW30 and C-MW31.
Moniioring well C-MW25 is screened in a permeable zone in the Vashon Till. It is
discussed below as a shallow aquifer well. Monitoring well5 CW-MW27, CW-MW29, .
CW-MW31, and CW-MW33 are screened in the' shallow aquifer. Monitoring wells
~W-MW26, CW-MW28, CW-MW30, and CW-MW32 are screened in the intermediate
groundwater zones of the Kitsap Formation. A perched aquifer is not present at Site
, C-Wesi. " ' " .
The following findings are presented for groundwater sampling by level and.class of
analytes. .
Metals. Metals results are presented below.
S1uJllow Aquifer. The concentrations of dissolved metals in the shallow aquifer of
. Site C- West were compared to screening criteria. Only ,arsenic and manganese,
exceeeded these screening criteria. .
Turbidity levels were greater than 200 nephelometric turbidity units (N11J) in most
samples. The high turbidity in these samples is likely the result of the fine-grained silt
present in the glacially deposited sediments. Particulates contained in these samples are
-------
SUBASE, BANGOR OPERABLE UNIT 4
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Contract No. N62474-89-D-9295
ero 0039
Record of Decision
Date: 05/31/94
Page 38
the likely source of the elevated total metal concentrations in the shallow aquifer wells.
The dissolved metals analysis supports this hypothesis because only background
. . groundwater metals were detected in filtered samples.
lnUrmeditlte Grormdwllter Zones (lGZ). The concentrations of dissolved metals detected
in the groundwater of the IGZof Site C-West were compared to screening criteria
v~ues. Arsenic and manganese were the only metals- that exceeded these criteria.
Turbidity levels were greater than 200 NTU in most samples. Only common metals,
such as calcium and magnesium, were detected. Given observed dissolved. metals
concentrations, none of the metals detected in the shallow aquifer or the IGZ of Site
C- West are considered compounds of concern.
Organic Compounds. Organic compound results are presented below.
No organic compounds were detected above screening criteria in the' shallow or
intermediate grOundwater zones: . . .
No pesticides or PCBs were detected in groundwater at Site C-West.
Two ordnance compounds, nittobenzene and picric acid, were detected at a low
frequency at concentrations below screening criteria. .
7.2
SITE C-EAST
Site C-East sample locations and results are presented in the following section, along
with the findings from the RIfFS. Tables 13 through 23 present the chemicals detected
at the site for each medium, compared to risk-based screening levels calculated by using
the assumptions and procedures. These tables show exceedances of potential ARAR and
background. H no ARAR exists for a chemical, then no exceedances were reported. H
no background exists for a chemical, then the exceedance is for the ARAR only. Surface
water and s~diments for Sites C-Westand C-Ea,st were discussed in Section 7.1. No .
additional discussion will be included in Section 7.2. . .
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EnginccriDg Field Activity, Northwest
Contract No. N62474-89-D-929S
'ero OQ39 .
Record of Decision
Date: 05/31/94
Page 39
Table 13
Site C-East-Chemicals Detected in Surface Soil
-
AlumiDum 36 36 6,S6O 17,200 12,430 - 19,546 0
,AlleDic 36 34 1.1 4.6 1.93' 20 3.69 0
Barium 36 36 40.6 92 58.9 5,600 134 0
BeJyUium 3 1 0.23 0.23 0.23 0.233 0.49 0
Cadmium 36 34 0.21 1.1 0.582 40 o.ss 0
Calcium 36 36 1,080 5,990 2,480 - 3,273 0
Cuomium 36 36 13.1 27.2 21.1 400 34 0
Cobalt 36 36 2.8 11.6 7.05 4,800 7.75 0
Copper 36 36 9.8 55.8 21.9 2,960 16 0
Iroa 36 36 4,340 17,400 12,238 - 16,958 0
Lead 36 36 2.8, 88.8 9.75 - 31.8 '0
Mapesium 36 36 883 5,920 3,727 - 4,033 0
Mallgaucsc 36 36 51.8 973 372 400 1,002 0
McrcuJy 36 6 0.13 1 0356 24 0.1 0
NicteJ 36 36 9.7 93.2 41.1 1,600 63.3 0
Potassium 36 36 S8.8 483 288 - 338 0
Silver 36 2S 0.41 5A 1.0 240 0.97 0
Sodium 36 35 . 77.4 620 242 - 476 0
Vuactium 36 36 14.3 38.4 28.6 S60 35.7 0
Zinc 36 36 9.5 4S.5 25.2 22,400 38.4 0
_~,~l~~lr~~~1~*~1:~~~N~~~: ~~1jtW~~~m ~~**@f:~t:\ fuln~~1*~ ~:mtffi~l~ ~~mif5~- ~ili1~~~~t~1~~~tJ~;W~' t:m'lflt~"ID:i;~ !WtMi@t¥MH%%f.'
Quo Fuel 36 2 0.QS8 0.11 0.084 - . 0
'inW.!.t~::::::;:~,M]lf.m ~r:fWtM1~~ ~t~~r~~t~~i~ ~ijtt*l~~; i~mlt..%W ~*~~mi~~~ml~; *~~f~i~jj;~*ttt~~~l~ ~i1W~~1imM: wm~~~m**«~jW~t{1~lt;
4-MetbylpbCllol 33 1 0.051 0.051 0.051 4,000 . 0
Benzo(b )flucmmtbeae 33 1 0.13 0.13 0.13 0.137 . 0
Beazoic acid 33 10 0.015 0.072 0.0359 320,000 . 0
OuyseDe 33 1 0.11 0.11 0.11 0.137 . 0
Di-HUtylpbtbalate 33 4 0.045 0.056 0.0495 8,000 . 0
F1uorantbeae 33 1 0.15 0.15 0.15 '3,200 . 0
PbeDantb%eDe 33 1 0.1 0.1 0.1 - . 0
Pyn;ne 33 1 0.13 0.13 0.13 2,400 . ,0
bis(2-Ethylbexyl)pbtbalate 36 12 0.048 1.6 0.347 71.4 . 0
~~Hili'g%:::l;f: t@jf1nj~1~~lt .,................. :]~t~~~~~~mmr~;~t1f ................. ~~~;~~~~~itt~i~ftm1j~it[f ......................... ~j~j1j@~~~i1j;~tt@~irt~ 11tt1~~m~;;m~~~~mili~~~titi~t~tl
itl~frj~~t~1~ti! m@rmlrI~ ~!~!~!t~~~~f~~~ji1~~1~Jr~t*
1,1,1- T richloroetbane 36 6 0.001 0.003 0.002 7,200 . 0
2.8utanoDc 36 3 0.018 0.029 0.0243 48,000 . 0
Acetone 36 13 0.006 0.35 0.0676 8,000 . 0
Benzenc 36 1 0.002 0.002 0.002 34.5 . 0
-------
SUBASE, BANGOR OPERABLE UNIT 4
U.s. Navy CLEAN CoDtract
Engineering Field Activity, Northwest
Contract No. N62474-89-D-9295
CTO 0039
Table 13 (Continued)
Site C-East-Chemicals Detected in Surface SoU
Record of DecisioD
Date: 05/31/94
Page 40
OIlOJOform 36 10 0.fKXT1 0.004 0.D0234 164 . 0
EtbylbeDzale 33 5 o.oD1 0.009 0.0052 8,000 . 0
MetbyleDe c:hJoride 36 29 0.004 0.14 0.040 133 . 0
Tetracblcnoetllene 36 34 Q.OO6 0.54 0.135 19.6 . 0
TOlIICDe 36 16 0.0009 0.016 0.00624 16,000 0
Xylene5 36 13 0.0009 0.015 0.00444 165,000 0
Notes:
. ARAR - applicable or zelevaDt aDd appopriate reqllilemeDt
- - Not applicable
. - Background esublished as zero
mg/tg - miWgram per kilogram
-------
SUBASE, BANGOR OPERABLE UNIT 4
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EuginceriDg Field Activity, Northwest
Contract No. N62474-89-D-9295
ero 0039
Record of Decision
Date: 05/31/94
Page 41
Table 14
Site C-East-Chemicals Detected in the Structural Fill Soil
. ...... .. ..
!:< "~"i:<;
... ...
:.",,,~.,....,.m-_"$;B:~M>,~:' " '" . .;~. . ¥*Hm!%:'M:i~" ~t4@,M%.'H_<.*~tt%.~~t~~%W;.,
.', ...'..",.... ..$i ".
AlumiDum 2S 2S 8,930 19,200 12,721 - 0
ADtimODY 2S 3 6 8.7 7:N. 32 0
AmeDic 2S 4 1.S 2.1 1.67 20 0
Barium 2S 2S 32.6 83 51.6 5,600 0
Beryllium 15 13 0.22 0.29 G.2S6 0.233 U
Cadmium 2S 3 0.25 0.68 0.413 40 0
Calcium 15 2S 1,460 5,590 2,8SS - 0
Quomium 15 2S 19.7 42.4 15.2 400 0
Cobalt 15 2S 5.3 17.7 7.72 4,800 0
Copper 2S 2S 7~ 26.S 14.1 2,960 0
boD 2S 2S 10,900 19,000 13,140 - 0
Lead 2S 24 1.4 7.1 2.66 - 0
Mapcsium 2S 15 3,3SO ,6.890 5,030 - 0
M8DpJ1ese 15 2S 143 S64 1ST 400 Z
Mcmuy 2S 6 0.11 0.2 0.135 24 0
N"ac:ltel 15 24 36.8 187 56.1 1,600 0
Potassium 2S 2S 240 SS6 399 - 0
SillIer 15 Z OA9 1.3 0.895 240 0
Sodium 2S 22 66.3 761 Z30 - 0
Vuadium 2S 2S 24.2 47 30.9 560 0
ZiDc 2S 2S ZO 34.2 2A 22,400 0
.,.."""""..::::",""".,,"":~:,,:",:",,",~'.;:.:@~:~@WfWi#.%f1tMf&¥tf1.,~::;:,\;-:,:/';;;::::', ~::':::"':::::;:;.:;;;g~;_mf.f%tWttW:m~WKt%'W**.¥mW*m*Th'W~f.&t~
Di-D-«tylphtba1ate 2S I z G.6 I 0.76 0.68 1,600 0
bi5(1-Etbylhczyl)pbthaJale I 2S I 10 0.071 I 0.76 0.3U 71.4 I 0
1t.Jf.fi.~:."'.',::::,:,;>Y?::_'%,¥fimWffi.m'91W1J'it@fj£_l.4_M::;>:>:;~'::"::~:~':":<"~'<:'>f@'W'mw~%9.4_Wffi$%1~W~~1:1m&W
Acetoae 2S 2 o.ot 0.G66 0.Q38 8,000 0
CaJbOD disulfide 15 1 0.005 0.005 O.oos 800 0
QloJObt ,.rUle 2S 1 0.004 0.004 0.004 1,600 0
Methylene chloride 2S Z O.OU 0.015 0.013S 133 0
Tetrachlometbene 2S 5 O.OOZ O.au 0.0108 19.6 0
Tricblometbeae 15 1 O.OOZ O.OOZ O.!lO2 90.9 0
No=:
, ARAR' = applic:ablc Or relevant and appropriale requirement
mg,lkg = milligram per kiIopam
- = not applicable
. = background established as zero
-------
~
SUBASE, BANGOR OPERABLE UNIT 4
U.s. Navy CLEAN Contract
Engineering Field Activity, Northwest
Contract No. N62474-89-D-9295
ero 0039. .
Record of Decision
Date:, 05/31/94
Page 42
Table 15
Site C-East-Chemicals Detected in the VashoD Recessional Outwash Soil
., ""'''" ., .~"*. ~:.~~:~..... "'~"'~~~r "'* \~::~:-:~ ," ",' v.v , ,,'f$' " , ., wr ' ' 'i;, ... ,.Yo" ', '."~"-V:-: " 'w .:
\. ..... .. , w ,'
AlumiDum Z4 24 6,110 22,400 10,915 - 0
ADtimODy Z4 4 73 19.7 11.7' 32 0
AJscDjc Z4 12 1.2 6.3 2.15 20 0
Barium Z4 Z4 20.1 140 43.1 5,600 0
BetyUium Z4 7 0.22 0.4 0.27 0.233 4
Cadmium Z4 3 0.32 0.73 o.s26 40 0
Calcium Z4 Z4 1,480 7,910 3,878 - 0
Ouomium Z4 Z4 13.8 as.l 7:7.4 400 0
Cobalt Z4 Z4 3.8 16.4 7.48 4,800 0
Copper Z4 Z4 8.1 30.1 16.6 2,960 0
boD Z4 Z4 8,7ro 28,400 l3,S72 - .0
Lead Z4 23 1.3 4.2 2.0 - 0
Magnesium Z4 Z4 3,450 9,010 4,835 - 0
MaapDese 2A 2A 121 432 234 .400 1
Memny 2A 1 0.12 0.12 0.12 Z4 0
Nickel Z4 Z4 26.3 77.4 42.9 1,600 0
Potassium 2A 2A 198 1,400 410 - 0
S"Jlver Z4 'I 0.46 0.46 Q.46 240 0
Sodium 2A 21 110 64S 331 - 0
V8D8dium Z4 Z4 17.8 79.7 33.6 S60 0
ZiDc Z4 2A 15.7 .56,4 23.9 22,400 0
m!M.fUif~tiMl~trwmk£w.t.r.__*t.«%t.'W~_W':,2: ':::::-"'''''':'''''"'"':'''',':''''.'.:.:.'' :~:,;W.UMKiMG.,::,;~~;,~'" :~~:iliiWW$W&'WMft~~t':i
.. :' :-:-:,,,:':0',;,,-,;,: :-:""X':'.
Otto Fuel ~ 1 0.Q82 0.082 0.Q82 I - I 0
~t:....".~:....:.~...:.........:;. ...~~...:~.~......... :..o}:.:o:.':.:'..:.,'.~' ':...:~' ..:.~:.;~:~...:::.::::. ..~~~ .~' :~. ::,::«.::;:::,.' '-::-;:-:(:~";~~:~:-:::::.:.::::::::~:::-.::::~~::x::....ill::»:":~: ...::::::::..»:.:-::z:::;:: :::~<:::~<:%;i&~:::::~*::r::E.i:::.,::;:::::0.;;%.1
8eDZo(a)pyreDe 23 1 0.75 0.75 0.75 0:137 1
Di-~htbaJatl: 23 6 0.081 0.72 0.323 1,600 0
bis(2-Ethylhexyl)phthalatl: 23 3 0.067 0.5 O.2SS 7l.4 0
r~fM_~1m*t;~r::minlwm~~~1iliJt~f:~~i*r~im1~fif~]i~~@mIfgn1m~lJtjUtl~*i:{@mm~jm~~~i~;~~~ii*1f*i~~~~~~l~~~fir.fd~~~~~f.!i$tim~
Acetone 2A 12 0.005 0.033 0.0128 8,000 0
Metbyleue chloride 2A 6 0.002 0.016 0.00533 133 0
Tenac:hJoroetbeDe Z4 3 0.001 0.004 0.00266 19.6 0
Notes:
ARAR = applicable or relevant and appropriate requirement
mg/kg = mil1igram per idiogram
- .. not applicable
. = background establisbed as zero
-------
SUBASE, BANGOR OPERABLE UNIT 4
U.s. Navy CLEAN Contract
Engineering Field ActiVity, Northwest
Contract No. N62474-89.D.9295
ero 0039
Record of Decision
Date: f1l/'2J!,/94
Page 43
Table 16
Site C-East-Chemicals Detected in the Vashon no SoU
"'''',''',''."
".
'"iwmm4%(ibiW:~'\ . . ~~:~:~t'~"~$: " "' "i<:~ 'r~$~M\Mt~\h.~*Att~*t;1t-"*'~ ~M~~" ..:::*..~%"%.:. »r"
","',"',","", , !:!::
AIummum 24 24 5,79.0 3S,200. 13,290 - l2,2S8 0
ADlimouy 24 21 6.9 57.9 16.6 32 3
Alseaie: 24 18 1.1 6.2 ~ 20 1.65 0
Barium 24 24 28 247 76.6 5,600 51.8 0
I He!yIlium 24 8 0.22 0.41 0.311 0.233 0.68 0
Cadmium 24 11 0.23 1.1 0.514 40 0
Calcium 24 24 2,480 11,900 6,654 4,m 0
ChroDUum 24 24 17.6 80.7 39.8 400 26.6 0
Cobalt 24 24 5.6 28 11.1 4,800 10.6 0
Copper 24 24 U 107 28.5 2,960 21.3 0
boD 24 24 10,300 51,800 19,758 - 15,816 0
Lead 24 24 1.2 13.6 .3.92 - l.97 0
MapClium 24 .24 ~,480 ZZ,600 8,166 - 6,415 0
MangaDesc 24 24 140 1,020 336 400 311 S
Memuy 24 ..2 0.1 0.1 0.1 24 .0.08 0
NicteJ 24 24 26.9 106 51.9 1,600 76.9 0
! POtassium 24 24 29S 4,730 984 490 0
SeleDium 24 3 0A3 0.61 0.49 400 0
Silver 24 4 0A3 2 0.942 240 0
~um .24 24 161 1,210 628 - 461 9
lIIallium 24 2 1.1 1.1 1.1 5.6 0
VlD8dium 24 24 19.5 103 49.1 S60 36.9. 0
ZiDe: 24 24 17.9 lU 40.8 ZZ,4OO 31.S 0
.:.....:...:...:.:~.w......... .:.:~:.... .::. . ............:...:*f~~~~~ ~~1~\~%" f;$~~l~* l~{~~_$ $MM*1::~' ~m%'~1:t~..:~*~ *~t.*~ti~~~~ :~~:::::~:~~:::~=i~" mtU%R%Wflttlj
HemD(8)py1eDe 24 2 0.32 1 0.66 0.137 . 2
Di+octyIphtbalate 24 1 0.85 o.ss 0.85 1,600 . 0
bis(2-EtbyIIIexyI)pbthalate 24 4 0.073 1.1 0.34 71.4 . 0
y>:w.~y.,,~,,"y'~,~'::..~~..~.' ~_t~"! DY ~\W€t~ IDi'~~~~ iW~~-mm~~ !WBfuVi :tmitt~r1r~! m~Wir~.tW %iWh'%1WR%'~
2-ButaDODe 24 2 029 0.8 0.545 48,000 . 0
Ac:eto1Ie 24 16 0.008 1.1 0.086S 8,000 . 0
Bemcae 24 1 0.061 0.061 0.061 34.5 . 0
Methylene c:I11oride 24 3 0.064 0.52 0.314 133 . 0
I Tetrae:hloroetheue 24. 2 0.001 0.002 O.OOu 19.6 . 0
TolueDe 24 1 0.015 0.015 0.015 16,000 . 0
Notes:
ARAR - app1ic:able or relevaDt aDd appropriate ~uiJaDeat
mg/kg - milligram per kilogram
- - DOt applicable
. - bae:kground established as zero
3039O\940S.121\TBl.16
-------
SUBASE, BANGOR OPERABLE UNIT 4
U.S. Navy CLEAN Contract
EDgineering Field Activity, Northwest
Contract No. N62474-89-D-9295
ero 0039
Record of DecisioD
Date: 05/31/94
Page 44
Table 17
Site C-East-Chemicals Detected in the Vashon Advance Outwash
.. .... '" "0"
:;.:.:.' ,
"-:.:.;."
."b
" ,
...::-»
.~ ~~~~'<. :: ~ ~*.. .,~. ,~:nq?,~,,:~ " ,~~~ '.. :miWk'..W&lUWMt@C', A1M., ~ :~~iT:h:
....
Alu~um 29 29 8,870 19,900 13,842 - 14,094 0
Aznimony 29 Z3 4.5 20 io.2 32 - 0
Azseaic 29 29 1.5 6.2 3.97 20 ~.1 0
Barium 29 29 46 128 83.9 S600 76.6 0
BezyWum 29 17 0.25 0.44 0.328 0.233 0.58 0
Cadmium 29 11 0.25 0.62 0.388 40 - 0
Calcium 29 29 3,640 10,600 7,819 - 8,458 0
CIromium . 29 29 27.7 66 45.5 400 41.8 0
Cobalt 29 29 6.4 17.9 13.1 4,800 14.7 0
Copper 29 29 16.2 41.2 ~ 2,960 29A 0
Iron 29 29 12,SOO 29,900 21,375 - 22,928 0
Lead 29 29 1.5 6.9 4.2 - 3.94 0
Maguesium 29 29 4,530 17,600 11,731 - 13,460 0
MupDese 29 29 154 553 366.9 400 386 12
Nickel 29 29 31.9 120 75.0 1600 91.8 0
Potassium 29 29 34S 2,120 1,236 - 1,236 0
SclcDium 29. 1 U7 0.67 0.67 400 - 0
SiNer 29 8 0.49 1.5 0.953" 240 2.56 0
SodiuiD 29 29 223 1040 S88 -' 450.6 0
Vaaadium 29 29 29.3 6S.B '4&5 S60 55.7 0'
ZiDe,. " 29 29 22.6 6S.5 44.8 22,400 46 0 '
:",:,~""::.,:",::":"""",,::,:,,,<,,, ,::::~:,Jm~$tLm:J~w~wdWi.WJ.Mi*-$4.tM*idWWM¥!4.&t#W@:$m$IM1f.tmM.t.1#*-M#&lf~%1tW
BeIIzo(a)pyrelle 26 4 I 0.26 1.3. 0.587 0.137 I. 4
=:=:~;;~;MimM}'~.1N~~:~.q;;;@m.~i1~A1&:Wm@m~~.
1,I,I-Trichloroetlwle 29 1 0.019 0.019 0.019 7)JXJ. 0
1,l,2,2-TetracblproetbaDe 29 1 0.006 0.006 0.006 5 . 0
2-ButaDone 29 2 0.03 0.C17 0.05 48,000. 0
Acetone 29 18 ' 0.003 0.1 0.0329 , 8,000. 0
Benzene 29 1 0.003 0.003 0.003 34.5 . 0
Cazbon disulfide 29 1 0.002 0.002 0.002 800 . 0
Chloroform 29 8 0.001 0.002 0.00187 164 . 0
Methylene cbloride 29 21 0.003 0.C178 0.0203 133 . 0
3039O\940S.121 \TBLI7
-,
-------
SUBASE, BANGOR OPERABLE UNIT 4
U.s. Navy CLEAN Contract
Engineering Field Activity, Northwest
Contract No. N62474-89-D-9295
ero 0039
Record of Decision
Date: 05/31/94
Page 45
Table 17 (Continued)
Site C-East-Chemicals Detected in the Vashon Advance Outwash
TetraCbloroetbeue
. Toluene
Xyleucs
29
29
29
7
4
1
0.005
O.()(g
0.002
0.13
0.008
0.002
0.D38
0.0032
0.002
19.6
16,000
165,000
.
o
o
o
Notes:
ARAR - applicable or relevaDt ucI appropriate requiremeDt
mg/kg - milligram per kilogram
- - Dot applicable
. - background established as zero
-------
SUBASE, BANGOR: OPERABLE UNIT 4
U.S. Navy CLEAN Contract
Engineering Field Activity, Northwest
Contract No. N62474-89-D-929S
eTO 0039
Record of Decision
Date: 05/31/94
Page 46
Table 18
Site C-East-Cbemicals Detected in tbe Intermediate Groundwater Zone SoU
-
9J,.~:::?:*~::t~~~:~::~~*:::~:::~:::~~~::%f:::::~~~:<::~~~:~;::*~~1~~~4:*?:*:;q::::13.t~1%~..;::~:::~':f_#~~:::::tij?:;~~~%%%~:.~~:Wi:t~?:~~i~~t~~i~l~.~=*~~r:t~'::~~~*~$~)1~a
Aluminum 1 1 13,400. 13,400 13,400 - 0
ADtimODY 1 1 10.8 10.8 10.8 32 0
Arsenic 1 1 4.4 4A 4.4 20 0
Barium 1 1 82.6 82.6 82.6 5,600 0
~um 1 1 0.24 0.24 0.24 0.233 1
Cadmium 1 1 0.32 0.32 0.32 40 0
Calcium 1 1 4,410 4,410 4,410 - 0
Cuomium 1 1 39.7 39.7 39.7 400 0
Cobalt 1 1 8.7 8.7 8.7 4,800 0
Copper 1 1 18.8 18.8 18.8 2,960 0
IroD 1 1 14,500 14,500 14,500 - 0
Lead 1 1 5 5 5 - 0
Magnesium 1 1 5,030 5,030 5,030 - 0
Mallgallese 1 1 171 171 171 400 0
Nickel 1 1 42.6 42.6 42.6 1,600 0
POtaSSium 1 1 466 466 466 - 0
SiMr 1 1 0.48 OAS 0.48 2AO 0
Sodium 1 1 510 510 510 - 0
Vanadium 1 1 47.6 47.6 47.6 S60 0
Zinc 1 1 33.9 33.9 33.9 22,400 0
!t::::::Jji!!!ti?_~I~~#t~f1r.tt~~~~;~~;J~tlmW*m~~i~~1~~~~~ml1;rii~~i1tWj~~t~111:1;~~~~~f.~rtJ~1~~~~~~~~~~%jj~~~i¥~i1~;~~j11rm~i1*~~l~~irJ*~~tlJi~j*~[@j~jfu:
8cDZo(a)pyrcne .1 1 I 1 T 0.49 I OA9 OA9 0.137 1 1
~t5t.J~-.:~:.:..:""":":::':~:'.'::::J{~j~?:~W:f~l%'f#:~~1~~ff.~~t11~r1;~~[~t~~j~i~~'1r~~~~~~~~~;J~@~~:~l~ii~~1~r:1;!:~f.~~~~*f~~~~~$~~~&;@~:~~fi~r~~~~~~~:~~~lf:~*fi~i$jim*~#~~~1l~jttl~tr:&&:mm~~~~.
2-BUtaDODe 1 1 0.045 0.045 0.045 48,000 0
AcctODe 1 1 0.13 0.13 0.13 8,000 0
CiJoroform 1 1 0.002 0.002 0.002 164 0
Methylene c:hIoriclc 1 1 0.018 0.018 0.018 133 0
Xylelle5 1 1 0.002 0.002 0.002 165,000 0
Notes:
ARAR - applicable or Rlev8IIt aDd a~te requiremellt
mg/kg - milligram per kilogram . .
- - DOt applicable
. - background establisbecS as zero
-------
SUBASE, BANGOR OPERABLE UNIT 4
U.s. Navy a..EA.N Contract
EDginecring Field Activity, Northwest
Contract No. N62474-89-D-929S
CTO 0039
Record of Decision
Date: 05/31/94
Page 47
Table 19
Site C-East-Chemica1s Detected in the Kitsap Formation Soil
-
. ,
,'.. ~::::'::'''~ .:~::::'r-<~'t...~o:"': :....... :;':'~ :-:' .' '.'~" xox~., '.. "','" : .:;".. '''. ~ . ~~~.. ....
'Ai;;;;~" x,*". ¥"W. x " ~ 2', 2" ~ ~ ..' .,~. . ,.,. :.... ,~.w 32,400 " "": a .,
Antimony 2 2 23.9 26.4 ZS.1 32 - 0
.AJsenic 2 2 5 5.4 5.2 20 7.24 0
Barium 2 2 210 23S 222 5,600 178.8 0
8eIyI1ium 2 1 OZl 0.27 on 0.233 1.S2 0
Cadmium 2 2 0.7 0.72 0.71 40 - 0
Calcium 2 2 13,000 16,200 14,600 - 12.,217 0
Cuomium 2 2 75.8 80.1 'T1.9 400 72.6 0
Cobalt 2 2 25.1 27.8 26.4 4~ 28.2 0
Copper 2 2 65.9 72.9 69A' 2,960 65.2 0
boa .2 2 47:;00 52,000 49,750 - 471XT7 0
I Lead 2 2 5.2 12.4 8.8 - 9.01 0
I Mapelium 2 2 zz;roo ~,900 23,800 20,600 0
Maqaese 2 2 1,Q20 1,120 1070 400 837 2
Mercury 2 1 0.13 0.13 0.13 24 - 0
I Nictc1 2 2 1SS.8 94.6 90.2 1,600 96.9 0
I Potassium 2 2- 4,wo ~,140 -S;OCIO - 4,518 0
Sdeaium 2 2 0.54 0.19 0.665 400 - 0
Silver 2 2 0.76 0.83 0.795 240 3.36 0
Sodium 2 2 970 1,120 1,045 957.7 0
TbaUium 2 1 1.3 1.3 1.3 S.6 - If
Vuaclium 2 2 96 101 98.S '. S60 108.S 0
Zinc 2 2 114 135 124 22,400 114.9 0
.. ,.~~' QA@'; ~~~~~*~ .~m~~~w: ~%W~1n# :i::"%~l~ 'wm~"'1 i:W*~~l~~ ~[~~~t~~t%t~~~~1*l .w...~~m~~~i~~::~~J~
"'",,,,,""',"','.'" '........."':"...' ~...:@:*::m :.
bis(2--Etbylhcxyl)pbtbalate 2 1 0.039 0.039 0.039 71.4 . 0
., '." .~..~¥ij~&' ~%lWftl1' ~'Ut~~~~ mt-\-':"=$~~ti1~ ~--:~\1.mm1::~ *=~~m::~~~~t~~: WJ~~~~~n~t\~f' *~~S:::i$l~~:: k~~~~~~**1~~m~~~~*~~!
':"':""'~"'.'. ..;':'~"""
AcctoDe 2 2 o.ou 0.015 0.0135 8,000 . 0
CaIboD disulfide 2 1 0.001 0.001 0.001 800 . 0
QIoroform 2 2 0.001 0.002 0.0015 164 . 0
Metbytcae cbloride 2 2 0.014 O.OS 0.032 133 . 0
Notes:
ARAR - appJic:able or relevant and ~te requirement
mg/kg - milligram' per tilogram
- - Dot appIic:able
. - background established as zero
-------
SUBASE, BANGOR OPERABLE UNIT 4
U.s. Navy a..EAN Contract
Engineering Field Activity, Northwest
Contract No. N62474-89-D~9295 .
cro 0039
Record of Decision
Date: 05/31/94
Page 48
Table 20
Site C-East-Chemicals Detected in Surface Water
S 126 451 0
4 116 Ul 0
1 3.2 3.2 20.3 0
S 1,380 ~ 0
1 2 2 162,000 0
Copper 1 6.8 6.8 2,660 0
bon S lU 202 0
Lead 2 1.8 2.3 0
um S 483 2,980 0
MaDpne5e S 4 3.8 43.1 0
Pot8ssium S 4 40S 1,330 0
Sodium. .959' s,oso 0
2.9 10.3 16,SOO 0
1
1
BalzeDe S 1 10 10 43 0
Tctracb10r0etbel1e 5 1 6 6 4.15 1
Toluene 1 2 2
Notes:
ARAR - appJlc:able or relevaDt ud Cll'lUC)poiate requiremeDt ,.
pgfL - microgram per tiler
- - DOt apptic8ble
-------
.
SUBASE, BANGOR OPERABLE UNIT 4
U.s. NaY)' CLEAN Contract
Engineering Field Activity, Northwest
Contract No. N62474-89-D-9295
ero 0039
Record of Decision
Date:. 05/31/94
Page 49
Table 21
Site C-East-Chemicals Detected in Surface Sediment
-
Aluminum 7 7 12,900 20,200 17,zz8
AlltimODY 7 2 6.1 24.4 15.2
AJseDic 7 4 1.2 2.3 1.72
Barium 7 7 52.3 1,610 281
BeJyI1ium 7 3 0.24 0.34 Q.276
Calcium 7 7 4,540 6,410 5,717
Cuomium 7 7 26 45.3 31.4
Cobalt 7 7 8.2 13.2 11.3
Copper 7 7 11.7 US 40.1
IroD 7 7 10,soo 20,800 16,757
Lead 7 7 3.7 22.2 8.41
Magnesium 7 7 2,510 7,050 5,498
MaDguCK 7 7 141 499 343
Men:ury 7 1 0.16 -0.16 0.16
Nickel 7 7 35.2 .su 42.4
Potuisium 7 7 456 87A S&3
Selenium 7 1 1.9 1.9 1.9
SiMr 7 2 1 2 1.5
Sodium 7 6 154 1,040 422
V8D8dium 7 7 34.6 53 42.2
ZiDc 7 7 Xl 151 51.9
...:.::..:::::.....:.:..,..:::~,...::.......:.::;.~:::.>S,R'Mfut%@W@i@,wAh\M¥llMlli?WkHl£ifl@.WMiWWWb.%iW&Wf:$;w'"&'i.W@W "'::""'''x'''''''' ~. :':"1m~
' .. .:-:-'
bis(2-Etbylhexyl)phtbalate I 6 I 2 I om4 o.oB7 o.osos
:yj~~... ......:.:. ..: .:$~~:~:::x:~~~~~~~:~~~;:~~~~ili~:~~i~~~~~t:~~~~~::::~~*~~.~::fu%::1~1M~:.::::~::::::::~~t~~~m~m~~:~~"*~ij.~~@.~~~1:~~~'=::'::":':':x:""~':~':m~'$.~~$m~~~m
Ac:etODe 7 3 0.01 0.027 0.0183
Beazeae 7 1 0.006 0.006 0.006
Methylene c:b1oride 7 6 0.005 0.066 0.028
XyieDes 7 1 0.002 0.002 0.002
Note:
lli!kg - microgram per kilogram
-------
~
SUBASE, BANGOR OPERABLE UNIT 4
U.S. Navy CLEAN Contract
Engineering Field Activity, Northwest
Contract No. N62474-89-D-9295
ero 0039
Record of Decision
Date: 05/31/94
Page 50
Table n
Site C-East-ChemicaIs Detected in the Perched Groundwater
-
:~:::
'~j.iU~ :'~~,v.:...:::.::.'?'~igt%' '.'_.~' .;"~"':'. ..,:: '::':" ,., ,:",~ ''''''X'''''',, ;~:.:," <',;: . "~'\:'a,'<~@W""~:,>.,',,' > ,"::« ... ~:, : W%[,
AlUminum 17 . 11' 99 312' 172 - 148 O.
AntUDony 17 i 19 19 19 6.4 - 1
ArscDic 17 6 5.3 3S.5 14.5 0.05 3 6
Barium 17 S 10.5 70.9 'no7 1,120 21 0
Calcium 17 17 4,040 28,000 10,Q20 - 17200 0
Cuomium 17 6 3.8 5.6 4.58 16,000 - 0
Copper 17 10 4.6 31.1 11.1 592 - 0
lroD 17 IS 14.6 1,770 326 - 162 0
Lead 17 4 12 '1..7 1.87 - - 0
Mape&i~ 17 17 1,760 14,500 5,092 - 12600 0
Manpaesc 17 16 2 343 71.3 80 176 3
Memny 17 1 3.6 3.6 3.6 4.8 - 0
Powsium 17 10 425 2,300 1,283 - 4940 0
Sodium 17 17 3,130 8,330 4,712 - 12700 0
"Iballium . 17 1 3.7 3.7 3.7 1.12 - 1
V8II8dium 17 2 3.1 3.S 3.3 112 - 0
ZiDc 17 12 4.5 156 rJ.9 4,800 IS o.
;:",:::,:.:::.:,':-W':¥~it_~ ,i&'fflW.f.'i:$#.Wi~MF ~:~~~~~~.. :0:', "'~5~~:m~F~~.~~~-@f%~~0:t¥tWJ.%N'-
2,4,6-TriDitrotoI- 14 6 O.ot6 0.36 0.107 2.92 . 0
2,4-DiDiUOtOlueue 17 4 0.QZ4 0.068 0.0457 32 . 0
2,6-DiDitmtolllCllc 17 4 0.01 0.028 O.D1S 16 . 0
Otto Fuel 10 3 0.D64 1 0.391 - . 0
RDX 17 1 0.48 0.48 0.48 0.795 . 0
ButylbeDzylpbtbalate 16 1 4 4 4 3,200 . 0
Di-D-butylphtbalate 16 3 1 4 3 1,600 . 0
Di-o-oc:tytphtbalate 16 7 1 38 11.4 320 . 0
Dicthylpbthalate 16 2 3 3 3 12,800 . 0
,
Napbtjuilcuc 16 1 4 4 4 32 . 0
bis(2-etbylbexyl) pbthalate 16 8 1 24 9.12 625 . 4
-------
~
SUBASE, BANGOR OPERABLE UNIT 4
U.s. Navy CLEAN Contract
Engineering Field Activity, Northwest
Contract No. N62474-89-D-9295
. ero 0039 .
Record of Decision
Date: 05/31/94
Page 51
. Table 22 (Continued)
Site C-East-Chemicals Detected in the Perched Groundwater
BenzeDe
Metbylene cbloride
TetrachJoroetbcDe
..
Notes:
ARAR. - applicable or reJevallt aDd appIOpriate. requirement
pgfL - mic:rogram per liter
- - DOt applieable
.. - bactpouDd established as 0
-------
SUBASE, BANGOR OPERABLE uNIT 4
U.S. Navy CLEAN Contract
Engineering Field Activity, Northwest
Contract No. N62474-89-D-9295
ero 0039
Record of Decision
Date: 05/31/94
Page 52
Table 23
Site C.East-Chemicais Detected in the Shallow Aquifer Groundwater
....... "..;.'«';.;.:.;-:-:-:.»:-:-:.".:-
~)j'TirF{t&$W ?W~iWmW@mW¥;~~ .,' " .-:.:"...~. .. ., ' :"':::::-::$:'::~~~ . "'~;:;( .~2..:'.~C~.<.'..., .l$kWWtl......
.. ... .. ............' '.'. ..... '.....','.. «...
AIumiDum Z4 19 67 11,900 ?91 - 148 0
AJseDjc Z4 9 2;9 11.8 5.87 o.os 3 7
Barium Z4 Z4 14A 185 59.2 1000 21 0
Calcium Z4 Z4 9,690 29;JI1J 20,382 - 17,200 0
Chromium Z4 6 2.2 44.4 10.8 so - 0
Cobalt Z4 1 28.7 28.7 28.7 960 - 0
Copper Z4 3 6.1 26.9 16.8 1300 - 0
!roD Z4 19 213 28,000 1,728 - 162 0
Lead Z4 8 1.2 193 4.5 15 - 1
MagDcsium Z4. Z4 4,560 19,000 10,817 - 12,600 0
MaDgaDese Z4 Z4 3 ?91 230 80 176 12
Memay Z4 3 031 L7 1.07 2 - 0
Nickel Z4 2 73 162 84.6 100 - 1
Potassium Z4 Z4 1,140 3,460 2,138 - 4,940 0
Sodium 24 24 6,300 43,600 13,102 - 12,'700 0
Vuadium 23 1 49.1 49.1 49.1 112 - 0
Zinc Z4 15 2.2 86.7 203 4,800 15 0
2,4,6- TriDitrotolueoe 21 2 0.009 0.018 0.0135 2.92 . 0
Otto Fuel 21 3 0.11 0.4 0.243 - . 0
RDX 21 6 0.025. 0.081 0.0518 0.795 . 0
B!..~Mr~:::::::@ii:4~~*~~t~~imi~~~~~1ii~Wtt~~~;jf~~f:11t~~1fu~~~f~t~~~~~;f:~~ti~f\;lli~1~~~~~i@i~ililli~~j;*~~~~ili~~M~j~i:~~~~t~ttf.i111~it1t~;r~~1ffi~i~Ii;fi~rf~..~~~~llil~\~~~~I~t:!~t
Metboxycblor 24 1 I 0.92 0.92 0.92 I 40 . 0
4-NitropheDol 24 1 20 20 20 - . 0
Di-D-butyiphtbalatc Z4 1 8 8 8 1,600 . 0
Di-n-oaylpbtbalate 24 3 1 16 833 320 . 0
Naphthalcnc 24 1 2 2 2 32 . 0
Ninobeozene 24 2 3 5.. 4 8 . 0
bis(2-etbylhcxyl) pbthalatc Z4 6 1 20 5.16 6 . 1
:e~~p..!:tmrnr::rm::::'IIr:~::::I:r:mr::::Ii:nr::r:::rmr::::::m:::J''H: ... .. .. .. ... :;:.\:~~~j~:tt~~~rj;j~~i1@j~~~~~~~~~~;~~f~1tt~1f~\~~t/~tM~~tf\tr1~~I~tfjj~1~t~j~~~\~~rj~j\ili~~~J~j~1~~~r~~~~~1m~lt~
... :
1,1,I-Tricbloroethanc 2S 6 3 13 8.66 200 . 0
1,I-Dicbloroethcnc 2S 3 1 2 1.33 7 . 0
Acetone 2S 3 7 11 8.66 800 . 0
Benzene 2S 1 2 2 2 5 . 0
-------
SUBASE, BANGOR OPERABLE UNIT 4
U.S. Navy CLEAN Contract
Engineering Field Activity, Northwest
Contract No. N62474-89-D-9295
ero 0039
Record of Decision
Date: 05/31/94
Page 53
Table 23 (Continued)
Site C-East-Chemicals Detected in the Shallow Aquifer Groundwater
OIJorobeDZeDe 2S 1 2 2 2 100 . 0
OIJoroform. 2S 1 3 3 3 100 0
Methylcue chloride 2S 7 3 7 5.42 5.83 . .4
TetracllJoroetbeae 2S 2 2 21 11.5 0.86 . 2
Toluene 2S 1 5 5 5 1,000 . 0
Notes:
ARAR - applic:able or Jelevant and appropriate requiJement
PIlL - microgram per liter
- - Dot appIic:ab1e
. - background establilhed as 0
-------
SUBASE, BANGOR OPERABLE UNIT 4
U.s. Na'Y CLEAN Contract
Engineering Field Activity, Northwest
Contract No. N62474-89-D-9295
ero 0039 .
Record of Decision
Date: 05/31/94
PageS4
7.2.1 Surface Soils
Ten surface soil samples were collected in each of three potentially impacted areas at
Site C-East. These areas are identified with the following designations:
.
A - a leachate pit iden~ed in the current situation report (Hart Crowser
. 1989) .
.
B -the former leachate pit that h~ been disturbed by road. construction
.
C - an area suspected of containing contaminated fill material returned
from Site C- West
The following findings are presented for surface soils by class of analytes.
Metals. No .metals conCentrations exceed screening criteria.
Organic Compounds. One ordnance compound, 9 SVOCs, and 10 VOCs were detected
in surface soilS at Site C-East (Table 13). None of these compounds exceeded screening
criteri~ .
No pesticides or PCBs were detected in Site C-East surface soils.
7.2~ Subsurface Soils
Nme soil borings were. drilled by using hollow-stem auger methods during February 1992. .
Three soil borings were drilled in each of the three identified disposal areas. Samples
were collected by using a 2-inch split spoon sampler. At Site C-East; soil boring samples
were taken continuously for visual analysis.. Four samples were collected from most
boring for chemical analyses. Thirty-six samples were selected, based on stratigraphy
encountered.
The following findings are presented for subsurface soils by class of analytes.
Metals. . Beryllium and manganese routinely exceeded screening in most geologic
formations. Antimony exceeded screening criteria in the Vashon Till.
Organic Compounds. All VOCs detected were below screening criteria.
-------
.
SUBASE, BANGOR OPERABLE UNIT 4
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, Page 5S
SVOCs detected in subsurface soils include benzo(a)pyrene, bis(2-ethylhexyl) phthalate,
and di-n-octylphthalate. Benzo(a)pyrene was primarily detected in CE-MW29, ,
CE-MW31, and CE-MW3S between 3S. and 82 feet. Benzo(a)pyrene detections were in
CE-MW31 at 60, 70, and 80 feet, which correspond to the acetone, 2-butanone, and
methylene chloride detections found in this well at these depths. The benzo(a)pyrene
detection locations in CE-MW29 also correspond to ~e acetone, 2-butanone, and
. Diethylene chloride detections for this well at dept,hs of 35 and 40,feet. Benzo(a)pyrene
was also detected in conjunction with acetone and 2-butanone at a depth of 60 feet ~t
CE-MW35. There was one shallow (14 to 1S feet) detection of benzo(a)pyrene at
CE-SB01, which is within the suspected fill area. All benzo(a)pyrene detections
exceeded screening criteria, with a maximum concentration of 1.3 mg/kg. '
7.2.3 Groundwater
One single well and four well clusters were inStalled at Site C-East (Figure S). The
single'well, CE-MW26, was 'installed upgradient of the site. This well and existing well .
'C-MW22 were used to assess the'upgradient characteristics of Site C-East. Well
C-MW22 was, screened in .the perched aquifer; well CE-MW26 was .screened in the uppe~
portion of the shallow aquifer. '
Wells CE-MW27, CE-MW28, and CE-MW29 were installed downgradient of the fill
material area. The wells were screened in the perched aquifer and the upper and lower
PQrtions of the shallow aquifer, respectively. .
. The.thfee remaining well clusterS were placed do~gradient of the suspected l~ate
. pits. Screens for CE-MW30 and CE-MW32 were installed in the upper portion of the
shallow aquifer; screens for CE-MW31 and CE-MW33 were installed in the iower
portion. The screen for CE-MW34 was installed in the perched aquifer, the screen for
CE-MW3S was installed in the upper portion of the shallow aquifer, and the screen for
CE-MW36 was installed in the lower portion of the shallow aquifer.
Existing monitoring wells C-MW01 through C-MW03 and C-MW12 through C-MW24
were used to supplement data obtained from newly installed wells at Site C-East.
C-MW21,' C-MW24, C-MW22, and C-MW18 were screened in the perched aquifer.
C-MW13, C-MW17, C-MW19, C-MW20, and C-MW23 were screened in the upper
portion of the shallow aquifer and C-MW01, C-MW02, C-MW03, C-MW12, C-MW14,
C-MW15, and C-MW16 were screened in the lower portion of the shallow aquifer.
Monitoring wells C-MWOl through C-MW03 and C-MW12 through C-MW18 do not
-------
.
SUBASE, BANGOR OPERABLE UNIT 4
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Contract No. N62474-89-D-9295
ero 0039
Record of Decision
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Page 56
meet current regulations for monitoring wells, as defined by WAC 173-160. They were
sampled during the first round of groundwater sampling, in accordance with the work
. . plan. The data from these wells were us~ to help characterize the site, but were not
used for risk evaluation or final decisions on site remedial action. Monitoring wells
C-MW19, C-MW20, C-MW21, C-MW22, C-MW23, and C-MW24 meet current
requirements for groundwater monitoring wells and were sampled. Data from these
wells were combined with data from newly inStalled monitoring .wells to proVide
information on the perched, upper shallow, and lower shallow aquifers.
The following are the findings for groundwater sampling by level and class of analyte.
Metals. Metals results are presented below.
PercJud Aquifer. Results for dissolved metals are compared to screening criteria in
Table 22. Antimony, arsenic, manganese, and thallium exceeded. these screening criteria.
Turbidity Was measured in excess of 200 N1U in many samples. Metals in the perched .
. aqUifer are generally comparable to background concentrations. . . . .
S1uJ11ow Aquifer. Results for dissolved metals are compared to screening criteria in
Table 23. Arsenic, lead, manganese, and nickel exceeded these screening criteria. .
Turbidity was measured in excess of 200 N1U in many samples. Metals concentrations
. in the shallow aquifer are generally comparable to background conditions.
Organic Compounds. Organic compound results are presented below.
PerchaJ Aquifer. VOCS detected in the perched aqUifer were acetone, benzene, 1,1,1-
trichloroethane, methylene chloride, and tetrachloroethene (peE). PeE and benzene
were detected once at concentrations that exceeded s~eening criteria. PCE was widely
detected in surface and near-surface soils at Site C-East, including the Pit A area.
Bis(2-ethylhexyl) phthalate is the only SVOC detected in the perched aquifer above
screening criteria. It was detected in monitoring wells C-MW21 (in the vicinity of Pit A)
and CE-MW24. .. .
. Otto fuel, 2,4-DNT, 2,6-DNT, RDX, and 2,4,6-TNT were detected in the perched
aquifer. All ordnance compounds were detected below screening criteria.
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SJudJow Aquifer. VOCs detected in the shallow aquifer are shown on Table 23.
Methylene chloride was detected at concentrations above screening criteria in monitoring
wells CE-MW26, CE-MW30, CE-MW33, and CE-MW35. Methylene chloride was widely
detected in subsurface sQils within. the Vashon Advance Outwash at Site C-East. PCE
was detected twice at Site C-East; both detections were above screening criteria.
Six SVOCs were detected in the shallow aquifer. Bjs(2-ethylheXyI) phthalate was the
only SVOC detected in the shallow aquifer at concen~tions above screening criteria.,
Ordnance compounds detected, all below screening criteria, were RDX, Otto fuel, and
2,4,6-lNT. ,
Methoxychlor was the only pesticide detected at Site C. It was detected in monitoring
well CE-MW30 at a concentration below screening criteria. '
, ,
, 8.0 SUMMARY OF SITE IUSKS
The baseline risk assessment analyzes current and potential future risks for a site and
may be used to assist in evaluating whether remedial action is needed. The
identification of the chemi~ of concern, exposure assessment, toxicity assessment, and
risk characterization are the primary components in a baseline risk assessment. The
evaluation presented herein indica~es the type of risks that could potentially result, if no
remedial action ,is taken' at OU 4. This section of the ROD reports the results of the .
baseline risk assessment conducted for this site. '
Both human health and ecological risk assessments (RAs) were performed for OU 4 to
determine the potential risks associated with chemicals identified at the site. The human
health assessments were conducted in accordance with EP A's Risk Assessment Guidmu:e
for Superfund, Volume I: Human Health Evaluation Manual (Pan A), Interim Final
(U.S. EPA 1989b), EPA's Supplemental Risk Assessment Guidance Region 10 (U.S. EPA
1991a), and Ule Human Health Evaluation Manual, Supplemental Guidance: Staiulard
Default Exposure Factors (U.S. EPA 1991b). The ecological risk assessment followed the
latest federal guidance. The RA methods and results are summarized in the proceeding
sections. ,
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8.1
HUMAN HEALTH RISK ASSESSMENT
The human health risk assessment evaluated potential risks associated with exposure to
chemical contaminants from OU 4. All chemicals that were detected at least once were
considered in the risk assessment. An initial screening step was performed that
compared the maximum de~ected concentration of chemicals in soil and groundwater
with site-specific background concentrations (inorganics only). Only those chemicalS that
. exceeded background were carried through the quantitative risk assessment. These'
chemicals are considered to be chemicals of potential concern, or COPC. Risks from
naturally occurring inorganics detected at background sampling locations were also
calculated. ' .
The assessment considered potential exposure to chemicals in groundwater, surface
water, soil, and sediments. Risks for current and future exposures were evaluated. The
current exposure scenario evaluated on-site workers; the future exposure scenario
addressed on-site workers and hypothetical future residents. Inhalation of volatile
chemicals released into indoor air while showering was evaluated for future residents.
Potential exposures to the perched aquifer were evaluated as surface water because t!1e
perched aquifer is too shallow for well development and seeps out of the ground in
several places.
8.1.1 Exposure Assessment
The purpose of the exposure assess~ent is to quantify contact with COPC identified at
the site.. This is accomplished by identifying the exposure media, potentially exposed.
populations (based on current and future land use), the routes of exposure, and
quantification of human intake of chemicals. The populations, media, and routes of
exposure that were. evaluated for each area are discussed below.
.
Exposed Populations. Current and potential future land uses were considered in
identifying potentially exposed on-site populations for OU 4. These potentially exposed
populations include current workers, future workers, and future residents. Risks were
calculated for both average exposures and for a "reasonable maximum" exposure (RME).
The RME exPosure scenario corresponds to the highest plausible degree of exposure
that may occur at the site.
Exposure Media and Pathways. Because of the similar nature of the sites at au 4, the
same media were evaluated for each of the different areas. The media that were
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quantitatively evaluated in the human health risk assessment include soil, groundwater,
surface water, and sediment. Although a limited number of sediment samples were
collected at the site, these sediments did not significantly differ from native soils and
were evaluated in the risk assessment as if they were soil samples.
. Although residential use. of groundwater was evaluated, there is currently no residenti'al
.' development at au 4 and. these exposures are strictly hypothetical. Risks from
residential use of filtered and nonfiltered groundwater were evaluated.
The following pathways were evaluated for each medium of concern:
.
Soil/sediment:
Ingestion and delJIlal contact (current and future
scenarios)
.
Groundwater:
Ingestion and inhalation of volatiles (future scenario
only) .
.
Surface water:
Dermal contact (current and future scenarios)
Exposure-Pomt Concentrations. Exposure-point concentrations (EPCs) are those
concentrations for each chemical to which an individual may potentially be exposed for
each medium at the site. EPCs for the average exposure scenario were based on the
arithmetic mean concentration for site chemicals. EPCs to the RME scenario were
based on the 95 percent upper .confidence li,mit of the..arithmetic mean (95 percent
VCL). EPCs were calculated for all chemicals which exceeded their background
. concentration. Chemical intakes for each exposure pathway were calculated by
combining the EPCs with other exposure parameters such as water ingestion rates,
inhalation rates, soil ingestion rates, dermal absorption rates, body weights, and exposure
frequencies and durations in accordance with EP A guidance. Default exposure
parameters recommended by EP A were used to evaluate exposure to soil and
groundwater; site-specific parameters were developed for surface water exposures.
8.1.2. Toxicity Assessment
The purposes of the toxicity assessment are (1) to weigh the available evidence regarding
the potential for chemicals to have adverse effects on exposed individuals (i.e., hazard
identification) and (2) to provide a quantitative estimate of the relationship between the
magnitude of exposure and the likelihood or severity of adverse effects (i.e., dose
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response assessment). Toxicity values are derived from epidemiological or animal
studies, to which uncertainty factors are applied (to account for variability among
humans and for the use of animal data to predict effects on humans). The sources for
toxicity values for chemicals at OU 4 are EPA's Integrated Risk Information System
(IRIS) database (U.S. EPA 1993) and 'the Health Effects Assessment Summary Tables
(U.S. ,EPA 1992a and 1992b).
Slope factors (SFs) have been developed by EPA for estimating excess lifetime cancer
risks associated with exposure to potential carcinogens. SFs are expressed in units of
(mg/kg-day)"l and are multiplied by the estimated daily intake rate of a potential
carcinogen, in mg/kg-day, to provide an upper-bound estimate of the excess lifetime
cancer risk associated with exposure at that intake level. The term "upper bound"
reflects the conservative estimate of the risks calculated from the SF. Use of this
approa~h makes underestimation of the actual cancer risk highiy unlikely.
, . Reference doses (RIDs) have been developed by EPA for evaluating the potential for
adverse health effects associated with exposure to noncarcinogenic chemical,s. RfDs' are
expressed in units of mg/kg-day and are estimates of acceptable ~etime daily exposure
levels for huinans, including sensitive individuals. Estimated intakes of chemicals of ,
concern from environmental media (e.g., the amount of a chemical ingested from
contaminated drinking water) are compared with the RID.
Toxicity values are only available for the oral and inhalation pathways. EP A has not
publisbed toxicity values for evaluating the dermal pathway. Oral toxicity values were.
used to evaluate dermal exposure in 'accordance with EP A recommendatioDS.
Because of its unique toxicity, lead does not have a verified reference dose; instead, EP A
recommends an alternative approach to evaluating lead toxicity. This approach involves
using EPA's LEAD 5 biokinetic model (U.S. EPA 1991) to estimate blood lead levels .
resulting from multipathway exposures. The results of this model are used to determine
whether the lead present in different media pose a potential risk to future residents at
the site.
8.1.3 Risk Characterization
The risk characterization integrates the information developed in the toxicity assessment
and exposure assessment to develop carcinogenic and noncarcinogenic risks. The
National Contingency Plan recommends an acceptable target cancer risk range of 10-6 to
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1(t4 for Superfund sites. Chemicals with cancer risks greater than t(t4 .require further
evaluation and remedial action. In this section, only those chemicals (or a combination.
of chemicals in the same media) with a cancer risk greater than EP A's acceptable risk
range will be discussed.
A noncarcinogenic risk (a hazard index greater than 1.0) indicates that exposure to a site
. . chemical exceeds the acceptable exposure level, as defined by the reference dose, and
may present a potential health threat. .
For inorganic compounds that have been identified as chemicals of concern, a
comparison with background concentrations was conducted to determine the contribution
.that naturally occurring levels may make to site risks. Risksassociatcd with background
levels of chemicals were also calculated. (The complete range of chemicals in different
media at the site is presented in the final RI and is part of the admjnj~trative record.)
Tables'24 through 30 preSent noncancer and cancer risk S11m~~ries for each area at
OU 4. Risk$ that exceed EPA's acceptable levels were found only for the future resident.
scenario and are attributable to background levels of inorganic compounds. Risks are
presented for groundwater; however, as discussed previously, these risks are hypothetical
because there are no on-site residential receptors that use the groundwater. Risks from
exposure to lead were evaluated by using the LEAD 5 biokinetic model recommended
by EPA No significant.risks for lead were found at C-East or C-West.
Summary of Risks for Site C-East. The chemicals associated 'with the majority of the
excess risks for Site C-East are presente4.in Table 24. These chemicals include.
1,1-dichloroethylene, tetrachloroethylene, benzo(b )fluoranthene, bis(2-ethylhexyl)
phthalate, and chrysene in groundwater.
The total hazard index and the cancer risk for all pathways in each scenario for Site
C-East are shown in Table 25. The hazard index and cancer risk associated with
naturally occurring background conditions are shown in Table 26 for comparison. Risks
associated with background levels of inorganics were generally equal to or greater than
on-site risks for the same chemical. .
The excess noncancer hazard index and cancer risk for current and future populations at
Site C-East are shown in Table 27. The excess risks shown in Table 27 do not include
inorganics in groundwater, which were attributed to naturally occurring conditions and
not related to previous human activities at the site.
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Table 24 '
Site C-East-Human Health Risks and Chemicals of Potential Concern
1,1-Dicbloroethylene
.Tetracbloroethylene,
Benzo(b )fluoranthene
Bis(2-ethylhexyl) phthalate
Chrysene
< 0.1
< 0.1
< 0.1
< 0.1
<'0.1
1 in 110,000 (9.2 x 1
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Table 27
Site C-East-Excess Hazard Index and Cancer Risk
""$:"''''~'''"$;:::~r::m@.:r~ ,,:<:,<;,%~,w-iR~~m:'E!rr'l ~'~~~~'n~)¥~»~«Y~" fu1il.::::::;~: :::,,:,~.MI
ili~t~llfl~1~\~~~~t~h...~.:: :~,.... ..:..::..~;1w~~~$W~~\~*&:;: *~;It~~i~::ix«;:.:.;:;.~~,,:.:.:<-.~.~..::.:~:~~;.~~:i~;It:*l~~
Current Worker less than 0.01 1 in 2,600,000 (3.8 x 10"')
Future Worker less than 0.01 1 in 270,000 (3.7 x 1
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Table 28
Site C-West-Total Hazard Index and Cancer Risk
Groundwater ingestion
Surface water dermal contact
Groundwater vapor inhalation
Soil ingestion
Soil dermal contact
Total aaoss pathways
. 0.8
<0.1
<0.1.
0.1
<0.1
0.9
1 in 11,000 (9.1 x 1O-S)
1 in 15,000 (6.6 x 1~)
1 in 100,000 (9.7 x 1~
1 in 12,000,000 (8.2 x 1~
1 in 10,000 (1 x 10")
Note:
- = not available
. . Table 29
Site C-West-Excess Hazard Index and Cancer Risk
..
.'::U~~~:. ."
.. ....
....:::~~?~::~..:.:h/::::.).;:.:::::'::::~~::~~ ... . ..
less than 0.01 1 in 450,000 (2.2 x l~
0.002 1 in 1,200,000 (83 x 10"')
0.20 1 In 590,000 (1.7 x. 1«r6)
';
..
.. .
CUITCDt Worker
Future Worker
Future Resident
8.1.4 Uncertainty
Some degree. of uncertainty is associated with each step of the risk assessment.
Important sources of uncertainty are discussed below.
Toxicity Assessment. There are numerous uncertainties associated with the approaches
used to develop toxicity criteria (e.g., differences in study design, species, sex, and route).
The magnitude and direction of UDcerta:inty associated with the toxicity values for most
chemicals are unknown. The EPA has noted, however, that the cancer slope for arsenic
is conservative and may overestimate the actual risk attributable to arsenic.
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As discussed in the toxicity assessment, oral toxicity values have been used for evaluating
dermal exposures. The mQgTlitude and'direction of uncertainty associated with this
approach are unknown.
Exposure Assessment. Most of the exposure assumptions used in the risk assessment are
default values recommended by E;P A These values are not site-specific and are
intended to be conservative. They are used to ensure that ~te risks are not
Underestimated. 'Actual exposures to site chemicals could be substantially less.
. ,
Because the groundwater is not currently used, the risks from ingestion of groundwater
are hypothetical; therefore, although the groundwater was evaluated to calculate a worst-
case scenario, the result is an overestimation of, total site risk.
Risk Characterization. Some uncertainty is. associated with the snmm~tion of risks for
multiple Chemicals. For example, not all noncarcinogenic chemicals have toxic effects on
the same organ; therefore, combining 'individual chemical noncancer risks may yield a
conservative estimate. ' .
8.2
ECOLOGICAL RISK ASSESS:MENT
The ecological risk as~essment for OU 4 is presented qualitatively rather than
quantitatively because of the disparities in the quality of habitats at the sites and
adjacent, areas and the lack of data for the adja,cent areas. '
Sites C-East and C-West are in an area that has been subject to anthropogenic
disturbances, which have modified site ecology. The area surrounding and encompassing
Site C is in various stages of revegetation caused by logging, homesteading, and past and .
current Naval activities.
The wetland area on the west portion of Site C-East is characterized by saturated or
near-saturated soil for most of the year. During the wet season, it may provide habitat
for aquatic invertebrates and amphibians; however, a viable fish population is unlikely,
becaUse of the seasonal water regime. Therefore, the wetland area is being evaluated
strictly for its potential effect on terrestrial species.
A coniferous forest dominated by Douglas fir occupies the area east of Pogy Road. A
deciduous forest dominated by red alder, with an understory dominated by sword fern,
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occupies the wetland south of the Darter Road and Flier Road intersection. The.
wetland was delineated by SUBASE, Bangor personnel in 1991 and was determined to
be a jurisdictional wetland. The wetland area is a shallow depression that collects
surface water runoff and groundwater seepage from the perched aquifer. It is
characterized by saturated or near-saturated soil for most of ' the year. Standing water
occurs only during significant surface water runoff. When there is no surface water
rilnoff, groundwater from the perched aquifer and underdrains continues to saturate the
, soil in the wetland area. .
The triangular portion of Site C-East that lies between Flier, Darter, and Pogy Roads is
covered with a limited variety of plant species. This area was cleared of trees and is
,dominated by. Scotch broom.
The overstory of Site C-East west of Flier Road consists of a mix of coniferous and
deciduous tree species. The west portion of Site C-East, near the intersection of Flier
and Pogy Roads, is primarily dOIpinated by Douglas fir interspersed with western red
cedar and grand fir.' The understory is dominated by sword fem ' ,
Building 7700 and the asphalt-covered area surrounding the building occupy most of
Site C- West. The habitat west of Building 7700 is a disturbed area dominated by Scotch
broom and has been cleared to provide a right-of-way for transmission lines that cross
Hunter's Ravine. The area south of Building 7700 is predominantly covered with
Douglas fir, while the area east of Building 7700 is predominantly covered with red
alder. Sword fern do~ates the unde~story in areas south and east of Building 7700.,
copcs were identified from the soil, sediments, surface water, and perched groundwater
data for each site. Identification was based on the following factors:
.
,Compliance with quality assurance/quality control guidelines
.
Comparison with site background concentrations
.
Consideration of environmental distribution and nutritional status of,
inorganic chemicals in soil
Soil data were screened to eliminate inorganic chemicals whose detected concentrations
were less than background values. Background surface soil concentrations for each
metal were derived, from background locations SS-BG 1 through SS-BG 10, using Ecology
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guidance (Ecology 1992). Inorganic chemicals whose maximum concentration exceeded
background were identified as COPCS; however, inorganic chemicals that exceeded
background concentrations but are ubiquitous minerals or nutritionally essential salts
(e.g., aluminum, calcium, iron, magnesium, potassium, and sodium) were identified as
COPCs when the maximum site concentrations were at least 10 times the 'respective
background concentrati~ns. This site-to-background factor was used in recognition of the
toxicological nature and relativeJy wide tolerances, to nutritioDally essential trace
elements. Potential toxicity associated with nutritionally essential' elements occurs when
chemical intake is too low or too high. Between these levels, most 'organisms are able to
tolerate a wide range of chemical intake and to metabolically regulate mineral levels
without symptoms of toxicity.
All organic.chemicals detected in surface water were considered COPCS. Inorganic
chemicals detected in surface water were considered COPCs, if they were also listed as
COPCs in surface soil and sediment.
'The overall emphasis of the environmental evaluation is on the potential chemical
exposure to adjacent habitats that may result from off-site transport ,of chemical
contamin~ntS 'and on the potential exposure of organisms that may be sporadic and
transitory visitors to the sites. The qualitative nature of this ecological evaluation is
further dictated by the high degree of uncertainty in the frequency and duration of
exposure to biota whose, presence at these sites is pr~bably sporadic and transitory.
The initial selection of COPCs for terrestrial habitat at Site C was considered,
. conserVative. Six inorganic cheuiicals were deleted as COPCS in soils on the basi$ of
, simple baCkground comparisons. All remaining chemicals were retained as COPCS and
evaluated further. The data evaluation included perched aquifer groundwater samples as
potential surface water sources, which represents a conservative approach to the
evaluation of surface .water ingestion by terrestrial receptors. Because of the high
uncertainty associated with the presence and concentration of tentatively identified
compoupds (TIC), these data were not included in the ecological assessment (EA).
A screening-level EA was used to evaluate potential risks to terrestrial receptors
(including 'the Townsend's vole~ the black-tailed deer, coyote, and great homed owl) from
chemicals detected in soil, sediment, surface water, and perched groundwater. Exposure
of terrestrial receptors representing several trophic levels was estimated by multiroute
exposure modeling. Hazard quotients (HQs), which are the ratio of the estimated
exposure to a toxicity reference value, were used to evaluate potential risks. HQs
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greater than 1 but less than 10 indicate the potential for an adverse effect to occur, while.
HOs greater than 10 indicate a probable concern.
The conclusions of the EA are that COPCS at Site C-East and C- West pose negligible
risks to the deer and predator species (coyote and great homed owl). HQs exceeded 1,
but were less than 10, for a vole exposed to RME concentrations of lead and vanadium
at Site C-East and manganese and vanadium at Site C..West, suggesting a low potential
for substantial adverse effects. Qualitative evaluation of these HQ values compared with
background concentrations and available toxicity information suggests that potential risks
for vole populations exposed to lead, manganese, and vanadium are negligible.
. .
9.0 DESCRIPflON OF ALTERNATIVE 1, NO ACTION
. .
9.1
OVERALL PROTEcrION OF HUMAN HEALTH AND THE ENVIRONMENT
The primary goals associated with the overall protection of human health and the
environment are to prevent unacceptable risks from ingestion or dermal contact with
groundwater. At Site C, the human health and environmental risk levels posed by all
media are within EP A's acceptable risk range. These goals are achieved by the no-
action alternative.
Screening criteria were previously defined in Section 8.0. Risk levels associated with
Sites C-East and C-West do not require remedial action under CERCLA. There are
exceedances of the MTCA cleanup goals in. both soils and groundwater. These'
exceedances are infrequent for organic compounds and more common for inorganics, .
especially metals in groundwater. These concentrations also exceed some maximum
cont~minant level (MCL) from the Safe Drinking Water Act. The observed levels of
inorganics in groundwater are from natural conditions and are not related to human
activities at the sites. This alternative would not reduce these exceedances of risk-based
screening levels.
9.2
NEPA COMPLIANCE
For NEPA compliance, wetlands, floodplains, historical preservation, and rare or
endangered species must be addressed. Sites C-East and C-West are not in a floodplain,
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but do contain wetlands. No historical preservation has been issued for the site; the
eagle is the only endangered species known to inhabit SUBASE, Bangor.
10.0 EXPLANATION OF SIGNIFICANT CHANGES
The proposed plan was released for public commen,t in November 1993. The proposed,
plan identified no action as the preferred alternative., The Navy, EP A, and Ecology ,
reviewed all written and verbal comments submitted during the public comment period.
Upon review of these comments, it was determined that no significant changes to the
remedy, as it was originally identified in the proposed plan, were necessary.
11.0 REFERENCES
. . . .
Hart Crowser. 1989. Cwient Siturltion Report, Sites C, D, E, F, 5, 6, 11, 12, 24, and 25. ,
SUBASE, Bangor, Washington. ' ' ,
United States Environmental Protection Agency (U.S. EPA). 1993. Integrated Risk
Information System (IRIS), an on-line database of toxicity values. U.S.
Environmental Protection Agency, Office of Research and Development,
Environmental Crit~ria and Assessment Office, Cincinnati, Ohio.
. 1992a. Health Effects ~essmeD:t Summary Tables (HEAST), Annual FY 1992, '
, and SupplementS No.1 and No. 2io the March 1992 Annual Update. OHEA ,
ECAO-CIN-821. U.S. Environmental Protection Agency, Office of Research and
Development, Office of Solid Waste Emergency and Remedial Response,
Washington, D.C.
. 1992b. Dennal Exposure Assessment: Principles and Applications. EPA/600-8-
91/011B.
" 1991. LEAD 5, A PC Software Application of the Uptake/Biokinetic Model.
. U.S. Environmental Protection Agency, ,Environmental Criteria and Assessment
Office, Office of Health and Environmental Assessment, Washington, D.C.
. 1991a. Supplemental Risk Assessment Guidance for Superfund. Region 10.
Seattle, Washington. August 16, 1991.
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-. 1991b. Human Health Evaluation Manual, Supplemental Guidance: Standard
Default Exposure Factors. OSWER Directive 9285.6-03. U.S. Environmental
Protection Agency, Environmental Criteria and Assessment Office, Office of
Health and Environmental Assessment, Washington, D.C.
-. 1989a. Guidance on Preparing Supeifund Decision Documents: The Proposed
. Plan, the Record of Decision, Explanation of Significant Differences, the Record of
Decision Amendment. Interim Final. EPA/540/G-89/007. Office of Emergency
and Remedial Response, U.S. EPA, Washington, D.C.
-. 1989b. Risk Assessment Guidance for Superfund. Vol. 1. Human Health
Evaluation Manual (Part A), Interim FinaL EPA/540/1-89/002. Office of
Emergency and Remedial Response, U.S. EPA, Washington, D.C. .
---. . 1989c. Interim Procedures for Estimating Risksksociated with Exposure to
Mixtures of Chlorinated Dibenzo-p-dioxins and -dibenzofurans (CDDs and CDFs)
and 1989 Update. EPA/625/3-89/016. U.S. EPA Risk Assessment Forum,
Washington, D.C.
United States Navy. 1993. The Proposed Plan for Remedial Action; Naval Submarine
Base, Bangor-operable Unit 4; Kitsap County, Washington. November 1993.
~. 1983. Initial Assessment Study of Naval Submarine Base Bangor, Bremerton,
Washington, NEESA 13-004.. June 1983.
lJRS ConSultants, Inc. (URS). Operable Unit 4 Final Remedia1lnvestigationjFeasibility
Study. May 1993. ..
Washington State Department of Ecology (Ecology). 1992. Statistical Guidance for
Ecology Site Managers. Toxies Cleanup Program. Olympia, Washington. August
1992.
~. 1991. Summary of Criteria and Guidelines for Contaminated Freshwater
Sediments. Olympia, Washington. .
..A
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SUBASE, BANGOR OPERABLE UNIT 4
U.s. Navy CLEAN Contract
Engineeriag Ficld Activity, Northwest
Contract No. N62474-89-D-9295
ero 0039
Rccord of Dccision
Attachmcnt 1
Date: 05/31/94
Page 1-1
1.0 SUMMARY OF PUBLIC COMMENT
The comments received by the Navy concerning the proposed plan were an oral
comment raised at and responded to during the public meeting. These two comments
were made by Jim Speer and AI Starcevich from'Olympic View Environmental Review
. Council (OVER C). The public meeting was recorded on a transcript, which is available
at .ihe information repositories. .
Summary of Comment: Two members. of a community organization OVERC stated that
the organization had reviewed technical documents regarding the proposed plan.
OVERC agreed with the proposed plan and felt the Navy had done .a good job during
the investigations and concurred that no action is warranted at Sites C-East and C-West.
The speakers thanked the Navy for the opportunity to participate in the process, and
Mr. Starcevich asked th~t during future public meetings OVERC be recognized for its
. involvement. .
2.0 RESPONSE TO COMMENT
Response: The NavY appreciates the comment regarding the quality of the documents
and investigations. The Navy is committed to citizen participation during all of these
investigations and encourages and values public participa~on in this process. In regards
to the presentation of the community .organization, OVERC, the Navy asked the
organization to briefly describe its function. The community organization then presented
its role in the public involvement. .
The Navy concurs and will acknowledge official representatives from OVERC and, in
order to be fair, will ask any other official representatives from other organizations to
introduce themselves. . .
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