JON S. CORZINEGovernor

§tau of Ne-Ut lIe-rs!"yDEPARTMENT OF ENVIRONMENTAL PROTECTION

Office of the Commissioner401 E. State Street - ih Floor

PO Box 402

Trenton, NJ 08625Tel: 609-633-1123Fax: 609-984-3962

October 23,2007

LISA P. JACKSONCommissioner

Daniel Nason

National Engineering ManagerImbrium™ Systems Corporation100 Grove StreetWorcester, Massachusetts 01605

Dear Mr. Nason:

In accordance with the Energy and Environmental Technology Verification (EETV) Act atN.J.S.A. 13:1D-134, the New Jersey Department of Environmental Protection (NJDEP) ispleased to issue a Conditional Interim Certification for the Stormceptor® OSR storm watertreatment system. This Conditional Interim Certification is being issued pursuant to thisprogram's receipt and review of the New Jersey Corporation for Advanced Technology(NJCAT) verification report, for the Stormceptor® OSR storm water treatment system, datedAugust 2007.

Based on the NJCA T verified laboratory performance, the NJDEP feels that the Stormceptor®OSR Model 250 has the capability of achieving in field applications a TSS removal efficiency of50%. Therefore, the NJDEP certifies the Stormceptor® OSR Model 250 at 50% TSS removalrate while operating at a treatment flow rate not to exceed 1,120 gpm (2.50 cfs). In addition,the various models of the Stormceptor® OSR storm water treatment system, as presented inTable 1 of the attached Conditional Interim Certification Findings, are also approved for use toachieve the same TSS removal efficiency of 50% from stormwater runoff, while operating at orbelow the respective designed treatment flow rates. The following conditions shall apply to theConditional Interim Certification:

1. Since the re-suspension test was not conducted, the Stormceptor® OSR storm watertreatment system can only be used as an offline system .. Therefore, the amount oJstormwater runoff diverted to the device must not exceed the respective designedflow rate.

2. The Stormceptor® OSR storm water treatment system is flow-based and shall be sizedto accommodate the peak of the water quality design storm as defined in thestormwater management rules at N.J.A.C. 7:8-5.5(a). If the peak flow is attenuated byanother device, the Stormceptor® OSR device must be sized to accommodate theoutflow from the attenuating device at a rate not to exceed the respective designedtreatment flow rate.

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3. Training must be provided to the users of the Stormceptor® OSR storm watertreatment system to perform scheduled maintenance following recommendedinspection for clogging, and accumulation of excessive debris and sediment. Thefrequency of inspection recommended by NJDEP is, at a minimum, at least four timesannually as well as after every storm that exceeds 1 inch of rainfall. Maintenancerecommendations are given in Table 2 of the attached Conditional InterimCertification Findings.

4. A field test of the Stormceptor® OSR storm water treatment system in accordancewith the requirements of the Technology Acceptance and Reciprocity Partnership(TARP) Tier II Protocol for Stormwater Best Management Practice Demonstration(July, 2003), and New Jersey Tier II Stormwater Test Requirements must becompleted, and the performance data submitted to NJCAT for final verification.However, before a field test can be initiated, a Quality Assurance Project Plan(QAPP) must be submitted to NJCAT for approval within six (6) months from thedate of the Conditional Interim Certification letter.

5. Field evaluation data that are consistent with the TARP Tier II Protocol and New

Jersey Tier II Stormwater Test Requirements, which are available from NJCAT orwww.state.ni.us/dep/dsr/bscitlDocuments.htm. shall be submitted to the NJDEP andNJCAT by March 1,2009.

6. The conditional interim certification of the Stormceptor® OSR storm water treatmentsystem shall expire on September 30,2009.

Failure to satisfy any of the above conditions may result in the rescission of this ConditionalInterim Certification letter. If you have any questions about this Conditional InterimCertification, please contact Ravi Patraju at (609) 292-0125.

Enclosure

Larry Baier, Director, Division of Watershed ManagementTom Micai, Director, Division of Land Use Regulation

, Narinder Ahuja, Director, Division of Water QualityEileen Murphy, Director, Division of Science, Research, and TechnologyRhea Brekke, Executive Director, New Jersey Corporation for Advanced TechnologyRavi Patraju, Research Scientist, Division of Science, Research, and Technology

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Conditional Interim Certification Findings

Manufactured Treatment Device: Stormceptor® OSR by Imbrium™ Systems Corporation Applicant Information:

Daniel Nason National Engineering Manager Imbrium™

Systems Corporation

100 Grove Street Worcester, Massachusetts 01605 (508) 792-1190

Technology Description As described in the verification report from New Jersey Corporation for Advanced Technology (NJCAT), the Stormceptor® OSR storm water treatment system is a vertically oriented cylindrical structure manufactured from concrete with a fiber reinforced plastic (fiberglass) insert. A weir and orifice plate on the fiberglass insert controls flow rates and operational velocities which are minimized in order to facilitate the capture of suspended solids and hydrocarbons, while retaining them over a range of subsequent hydrological conditions. A schematic of the Stormceptor® OSR storm water treatment system is shown in Figure 1.

Figure 1. Stormceptor® OSR Test Device

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Pollutants that accumulate within the system are removed from above ground through a vacuum truck without interference from the internal components. The Stormceptor® OSR is a different product from the regular Stormceptor® STC which was verified by NJCAT in 2004. The Stormceptor® OSR will be a product added under the Stormceptor® portfolio and a new product offering from Imbrium™

Systems

Corporation designed to specifically target the removal of fine sand-sized particles. This methodology differs from the original Stormceptor® STC platform which focuses on removal of very fine particles. NJCAT Verified Claim

The Stormceptor® OSR Model 250 at a flow rate of 1,120 gpm (2.50 ft

3/s), has been

shown to have a 69% Total Suspended Solids (TSS) removal efficiency, as measured as suspended solids concentration (SSC) (as per the NJDEP methodology for calculation of treatment efficiency) using OK-110 silica sand with an average d50 particle size of approximately 100 microns, an average influent concentration of 202 mg/L and 50% initial sediment loading in laboratory studies using simulated stormwater. NJDEP Conditional Interim Certification Based on the NJCAT verified laboratory performance, the NJDEP feels that the Stormceptor®

OSR Model 250 storm water treatment system has the capability of

achieving in field applications a TSS removal efficiency of 50%. Therefore, the NJDEP certifies the Stormceptor®

OSR Model 250 at 50% TSS removal rate while

operating at a treatment flow rate not to exceed 1,120 gpm (2.50 cfs). In addition, the various models of the Stormceptor®

OSR storm water treatment system, as presented in

Table 1, are also approved for use to achieve the same TSS removal efficiency of 50% from stormwater runoff, while operating at or below the respective designed treatment flow rates. Model 780 comprise two 390 models and model 1125 comprise two 560 models.

Table 1. Stormceptor® OSR Treatment Flow Rates

The following conditions shall also apply to the Conditional Interim Certification:

1. Since the re-suspension test was not conducted, the Stormceptor® OSR storm

water treatment system can only be used as an offline system. Therefore, the

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amount of stormwater runoff diverted to the device must not exceed the respective designed flow rate.

2. The Stormceptor® OSR storm water treatment system is flow-based and shall

be sized to accommodate the peak of the water quality design storm as defined in the stormwater management rules at N.J.A.C. 7:8-5.5(a). If the peak flow is attenuated by another device, the Stormceptor®

OSR device must be sized to

accommodate the outflow from the attenuating device at a rate not to exceed the respective designed treatment flow rate.

3. Training must be provided to the users of the Stormceptor® OSR storm water

treatment system to perform scheduled maintenance following recommended inspection for clogging, and accumulation of excessive debris and sediment. The frequency of inspection recommended by NJDEP is, at a minimum, at least four times annually as well as after every storm that exceeds 1 inch of rainfall. Maintenance recommendations are given in Table 2 below.

4. A field test of the Stormceptor® OSR storm water treatment system in

accordance with the requirements of the Technology Acceptance and Reciprocity Partnership (TARP) Tier II Protocol for Stormwater Best Management Practice Demonstration (July, 2003), and New Jersey Tier II Stormwater Test Requirements must be completed, and the performance data submitted to NJCAT for final verification. However, before a field test can be initiated, a Quality Assurance Project Plan (QAPP) must be submitted to NJCAT for approval within six (6) months from the date of the Conditional Interim Certification letter.

5. Field evaluation data that are consistent with the TARP Tier II Protocol and New Jersey Tier II Stormwater Test Requirements, which are available from NJCAT or www.state.nj.us/dep/dsr/bscit/Documents.htm, shall be submitted to the NJDEP and NJCAT by March 1, 2009.

6. The conditional interim certification of the Stormceptor® OSR storm water

treatment system shall expire on September 30, 2009. Maintenance Recommendations As described in the verification report, maintenance must be performed when

sediments accumulate to 15% of the lower chamber’s total volume of the respective models, which is equivalent to the respective depths as follows:

Table 2. Sediment Depths for Scheduling Maintenance

Stormceptor® OSR Models Sediment Depths for Maintenance

065 8 inches 140 8 inches 250 12 inches 390 17 inches 560 17 inches 780 17 inches 1125 17 inches

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Disposal of debris, trash, sediment, and other waste material should be done at suitable disposal/recycling sites and in compliance with all applicable local, state, and federal waste regulations.

Technology Limitations/Concerns The Stormceptor®

OSR models do not target very fine silt and clay sediments. If

installing after an attenuating device, the user of a Stormceptor® OSR device should

consider whether it is capable of removing the sediments leaving the attenuating device.

Heavy loads of sediment will increase the needed maintenance frequency. Lack of maintenance may cause the system to operate at a reduced efficiency.

The Stormceptor® OSR storm water treatment system will not increase the net

pollutant load to the downstream environment. However, pollutants such as organic matter that remain in the device may decompose and release nitrogen in the form of nitrogen gas or nitrate. Steps should be taken to reduce the amount of organic matter to the device, especially in areas that may be sensitive to nitrogen.

Although the Stormceptor® OSR storm water treatment system is a self-contained

unit, the design does incorporate standing water in the lower chamber, which can be a breeding site for mosquitoes. The technology has not been tested to identify mosquito related effects.