THE ENVIRONMENTAL TECHNOLOGY VERIFICATION
PROGRAM
U.S. Environmental Protection Agency
NSF International
ETV Joint Verification Statement
TECHNOLOGY TYPE:
APPLICATION:
TECHNOLOGY NAME:
TEST LOCATION:
COMPANY:
ADDRESS:
WEB SITE:
EMAIL:
STORMWATER TREATMENT TECHNOLOGY
SUSPENDED SOLIDS TREATMENT
TERRE KLEEN™ 09
HARRISBURG, PENNSYLVANIA
TERRE HILL CONCRETE PRODUCTS
485 Weaverland Valley Road
Terre Hill, Pennsylvania 17581
http://www.terrehill.com
precastsales@terrehill.com
PHONE: (800)242-1509
FAX: (717)445-3108
NSF International (NSF), in cooperation with the U.S. Environmental Protection Agency (EPA), operates
the Water Quality Protection Center (WQPC), one of five active centers under the Environmental
Technology Verification (ETV) Program. The WQPC recently evaluated the performance of the Terre
Kleen™ 09 (Terre Kleen™), manufactured by Terre Hill Silo Company, Inc. T/D/B/A Terre Hill
Concrete Products (THCP). The Terre Kleen™ device was installed at the Department of Public Works
(DPW) facility in Harrisburg, Pennsylvania. The testing organization (TO) for the evaluation was headed
by a faculty member from the Environmental Engineering Department of The Pennsylvania State
University - Harrisburg (PSH) in Middletown, Pennsylvania.
EPA created ETV to facilitate the deployment of innovative or improved environmental technologies
through performance verification and dissemination of information. The ETV Program's goal is to further
environmental protection by accelerating the acceptance and use of improved and more cost-effective
technologies. ETV seeks to achieve this goal by providing high quality, peer-reviewed data on technology
performance to those involved in the design, distribution, permitting, purchase, and use of environmental
technologies.
ETV works in partnership with recognized standards and testing organizations; stakeholder groups, which
consist of buyers, vendor organizations, and permitters; and with the full participation of individual
technology developers. ETV evaluates the performance of innovative technologies by developing test
plans that are responsive to the needs of stakeholders, conducting field or laboratory tests (as appropriate),
collecting and analyzing data, and preparing peer-reviewed reports. All evaluations are conducted in
accordance with rigorous quality assurance protocols to ensure that data of known and adequate quality
are generated and that the results are defensible.
06/29/WQPC-WWF
The accompanying notice is an integral part of this verification statement.
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TECHNOLOGY DESCRIPTION
The following description of the Terre Kleen™ was provided by the vendor and does not represent
verified information.
The Terre Kleen™ device combines primary and secondary chambers, baffles, a screen, and inclined
sedimentation, as well as oil, litter and debris/sediment storage chambers, into a self-contained concrete
structure. The primary benefit of the Terre Kleen™ device is its ability to efficiently settle solids in the
inclined cells (lamella plates) located in the secondary chamber using hydrodynamic principles. The
design of the unit provides for underground installation as an in-line treatment device, where it may be
applied at a critical source area, or a larger unit may be installed in a storm sewer main to provide
treatment for larger flows. Installation can be performed using conventional construction techniques.
Terre Kleen™ units can be designed to provide specific removal efficiencies based on the size
characteristics of the suspended solids and flow rate of storm water to the device.
The Terre Kleen™ device addresses the concern of being space-effective, providing high particle removal
efficiency given the device's relatively small footprint. The ability to install the device below grade
allows for the use of the above-ground space, and makes it easier for the device to be retrofitted into a
pre-existing storm sewer system. The design allows for some treatment of all water that enters the
primary settling chamber of the device, even if the flows exceed the capacity of the secondary (lamella
inclined plate) chamber. The treated and bypassed water recombine prior to discharge from the device.
Re-suspension of captured material below the inclined plates is minimized because the stormwater enters
the inclined cells sideways instead of scouring the top of the sediment.
The vendor claims that the Terre Kleen™ device installed for the verification test will remove 100% of
particles 200 microns ((im) and larger in stormwater when the device is operating at the design storm flow
of 3.49 cubic feet per second (cfs), which is based on the 25-year storm for Harrisburg. THCP also claims
that at lower flows, removals of particles smaller than 200 (im will also be achieved.
VERIFICATION TESTING DESCRIPTION
Methods and Procedures
The test methods and procedures used during the evaluation are described in the Environmental
Technology Verification Test Plan for Terre Hill Concrete Products: The Terre Kleen™, City of
Harrisburg, Pennsylvania. (November 2004). The Terre Kleen™ device was installed at the downstream
end of the stormwater collection system at the City of Harrisburg Department of Public Works facility.
The drainage area is part of the city's maintenance yard occupied by the Bureau of Sanitation, and
includes runoff from buildings and paved and unpaved parking areas having a 90 to 95% impervious
drainage area initially estimated at approximately 1.27 acres, but was later estimated to be approximately
2.5 to 3 acres after topographic maps with finer contours were made available.
Verification testing consisted of collecting data during a minimum of 15 qualified events that met the
following criteria:
• The total rainfall depth for the event, measured at the site, was 0.2 in. (5 mm) or greater;
• Flow through the treatment device was successfully measured and recorded over the duration of
the runoff period;
• A flow-proportional composite sample was successfully collected for both the inlet and the outlet
over the duration of the runoff event;
• Each composite sample was comprised of a minimum of five aliquots, including at least two
aliquots on the rising limb of the runoff hydrograph, at least one aliquot near the peak, and at least
two aliquots on the falling limb of the runoff hydrograph; and
• There was a minimum of six hours between qualified sampling events.
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Automated samplers and flow monitoring devices were installed and programmed to collect composite
samples from the inlet and outlet, and to measure the stormwater flow into and out of the device. In
addition to the flow and analytical data, operation and maintenance data were recorded. Samples were
analyzed for total suspended solids (TSS) and suspended sediment concentration (SSC). The samples
were also analyzed to quantify the mass of particles greater than 250 (im in size and to determine the
particle size distribution for particles ranging in size from 0.8 to 240 (im.
VERIFICATION OF PERFORMANCE
The performance verification of the Terre Kleen™ device consisted of an evaluation of flow, sediment
reduction, and operations and maintenance data collected during 15 qualified storm events over a period
of approximately 11 months.
Test Results
The precipitation data for the rain events are summarized in Table 1.
Table 1. Rainfall Data Summary
Event
Number
1
2
o
3
4
5
6
7
8
9
10
11
12
13
14
15
Date
6/29/05
7/7/05
8/16/05
8/27/05
9/16/05
10/13/05
10/21/05
11/16/05
11/22/05
11/29/05
12/25/05
1/2/06
1/11/06
4/3/06
5/13/06
Start
Time
12:00
18:40
09:35
19:05
18:55
05:20
22:45
10:30
23:20
04:55
11:50
10:45
12:50
14:40
16:20
Rainfall
Amount
(in.)
0.31
1.68
0.43
0.68
1.22
0.63
1.17
0.20
0.52
1.04
0.45
0.99
0.42
0.75
0.71
Rainfall
Duration
(hnmin)
2:00
15:00
11:10
14:00
5:40
21:55
24:15
14:40
9:45
19:05
8:40
25:40
11:05
7:50
54:10
Peak Flow
Rate
(cf s) 1
0.83
0.82
0.029
0.76
2.0
0.50
0.80
0.013
0.37
1.2
0.26
0.14
0.20
0.36
0.089
Runoff
Volume
(ft3) 1
750
7,900
210
1,800
4,900
960
3,800
110
1,300
6,500
580
940
480
1,500
660
1. Runoff volume and peak discharge rate measured at the outlet monitoring point, with the exception of event
14, which was measured at the inlet monitoring point. See the verification report for further details.
The flow monitoring and analytical results were evaluated using event mean concentration (EMC) and
sum of loads (SOL) comparisons. The EMC evaluates treatment efficiency on a percentage basis, with
the calculation being made by dividing the outlet concentration by the inlet concentration and multiplying
the quotient by 100. The EMC was calculated for each analytical parameter and each individual storm
event. The SOL comparison evaluates the treatment efficiency on a percentage basis by comparing the
sum of the inlet and outlet loads (the parameter concentration multiplied by the runoff volume) for all
storm events. The calculation is made by subtracting the quotient of the total outlet load divided by the
total inlet load from one, and multiplying the difference by 100. SOL results can be summarized on an
overall basis since the load calculation takes into account both the concentration and volume of runoff
from each event. The SOL calculation was also conducted for TSS and SSC samples with sediment
particles greater than 250 (im. The analytical data ranges, EMC range, and SOL reduction values are
shown in Table 2.
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Table 2. Analytical Data, EMC Range, and SOL Reduction Results
Parameter
TSS
SSC
Inlet
Range
(mg/L)
58-6,900
75 - 7,000
Outlet
Range
(mg/L)
35 - 980
35 - 1,500
EMC
Range
-88 - 86
-11-87
SOL
Reduction
44
63
SOL Reduction
Particle Size >250 urn
85
98
SOL Reduction
Particle Size
35
32
<250 um
Both the TSS and SSC analytical parameters measure sediment concentrations in water. However, the
TSS analysis uses an aliquot drawn by the analyst from the sample container, while the SSC analysis uses
the entire contents of the sample container. Heavier solids may not be picked up in the drawn aliquot for
the TSS analysis, such that the TSS will tend to be more representative of the lighter solids
concentrations.
The particle size distribution data showed that the Terre Kleen™ was approximately 98% effective in
removing particles 200 (im or larger. When the particle size distribution data is combined with the
hydrologic data, it shows that the performance of the device generally removed all of the particles 200 (im
or larger when treating flows of 2.0 cfs or lower. The rated flow capacity (3.49 cfs) of the Terre Kleen™
was not exceeded during any of the 15 storm events. This device is designed to treat the entire entering
flow (bypass over the plates was monitored after the primary chamber and at no time during the testing
were the plates bypassed).
System Operation
The Terre Kleen™ was installed in February 2005, with no major issues noted. The Terre Kleen™ device
was cleaned prior to the start of testing in March 2005, and was inspected frequently during verification.
A review of the storm event records in January 2006 showed that two late January storms had substantial
negative removals. Therefore, the decision was made to clean the device at the end of January 2006.
Sediment depths prior to pump-out were between 50% and 75% of the maximum design sediment depth,
measured at several points in the device. This maintenance activity consisted of using a sewer vactor
truck from the City of Harrisburg to dewater and remove sediment from the device. A sample of the
sediment was analyzed for Toxicity Characteristic Leachate Procedure (TCLP) metals and the
concentrations were lower than the hazardous waste limits of 40 CFR Section 261.42.
Quality Assurance/Quality Control
NSF personnel completed a technical systems audit during testing to ensure that the testing was in
compliance with the test plan. NSF also completed a data quality audit of at least 10% of the test data to
ensure that the reported data represented the data generated during testing. In addition to quality
assurance (QA) and quality control audits performed by NSF, EPA personnel conducted an audit of NSF's
QA Management Program.
Note for this Revision
The original verification statement was signed in September 2006 but revised in July 2008 to reflect a
change in the method the drainage area size and the runoff volume and peak runoff intensity were
calculated. See Sections 3.2 and 5.1.1 of the verification report for information on the revised drainage
area size and runoff calculations, respectively.
06/29/WQPC-WWF The accompanying notice is an integral part of this verification statement. Revised July 2008
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Original signed by Original signed by
Sally Gutierrez October 14, 2007 Robert Ferguson October 3, 2007
Sally Gutierrez Date Robert Ferguson Date
Director Vice President
National Risk Management Research Laboratory Water Systems
Office of Research and Development NSF International
United States Environmental Protection Agency
NOTICE: Verifications are based on an evaluation of technology performance under specific,
predetermined criteria and the appropriate quality assurance procedures. EPA and NSF make no expressed
or implied warranties as to the performance of the technology and do not certify that a technology will
always operate as verified. The end user is solely responsible for complying with any and all applicable
federal, state, and local requirements. Mention of corporate names, trade names, or commercial products
does not constitute endorsement or recommendation for use of specific products. This report is not an NSF
Certification of the specific product mentioned herein.
Availability of Supporting Documents
Copies of the ETV Verification Protocol, Stormwater Source Area Treatment Technologies Draft
4.1, March 2002, the test plan, the verification statement, and the verification report (NSF Report
Number 06/29/WQPC-WWF) are available from:
ETV Water Quality Protection Center Program Manager (hard copy)
NSF International
P.O. Box 130140
Ann Arbor, Michigan 48113-0140
NSF website: http://www.nsf.org/etv (electronic copy)
EPA website: http://www.epa.gov/etv (electronic copy)
Appendices are not included in the verification report, but are available from NSF upon request.
06/29/WQPC-WWF The accompanying notice is an integral part of this verification statement. Revised July 2008
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