Conditional Interim Certification Findings

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2 JON S. CORZINE Governor tau of Ne-Ut lie-rs!"y DEPARTMENT OF ENVIRONMENTAL PROTECTION Office of the Commissioner 401 E. State Street - ih Floor PO Box 402 Trenton, NJ Tel: Fax: LISA P. JACKSON Commissioner October 23,2007 Daniel Nason National Engineering Manager Imbrium Systems Corporation 100 Grove Street Worcester, Massachusetts Dear Mr. Nason: In accordance with the Energy and Environmental Technology Verification (EETV) Act at N.J.S.A. 13:1D-134, the New Jersey Department of Environmental Protection (NJDEP) is pleased to issue a Conditional Interim Certification for the Stormceptor OSR storm water treatment system. This Conditional Interim Certification is being issued pursuant to this program's receipt and review of the New Jersey Corporation for Advanced Technology (NJCAT) verification report, for the Stormceptor OSR storm water treatment system, dated August 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 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 of the attached Conditional Interim Certification Findings, 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. The following conditions shall 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 amount oj 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. New Jersey Is An Equal Opportunity Employer Printed on Recycled Paper and Recyclable

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 of the attached Conditional Interim Certification Findings. 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 shall be submitted to the NJDEP and NJCAT by March 1, The conditional interim certification of the Stormceptor OSR storm water treatment system shall expire on September 30,2009. Failure to satisfy any of the above conditions may result in the rescission of this Conditional Interim Certification letter. If you have any questions about this Conditional Interim Certification, please contact Ravi Patraju at (609) Enclosure Larry Baier, Director, Division of Watershed Management Tom Micai, Director, Division of Land Use Regulation, Narinder Ahuja, Director, Division of Water Quality Eileen Murphy, Director, Division of Science, Research, and Technology Rhea Brekke, Executive Director, New Jersey Corporation for Advanced Technology Ravi Patraju, Research Scientist, Division of Science, Research, and Technology

4 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 (508) 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 - 1 -

5 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 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 d 50 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 - 2 -

6 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 shall be submitted to the NJDEP and NJCAT by March 1, The conditional interim certification of the Stormceptor OSR storm water treatment system shall expire on September 30, 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 inches inches inches inches inches inches inches - 3 -

7 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

Conditional Interim Certification Findings

NJDEP Technology Certification Program: Conditional Interim Certification Findings Bureau of Sustainable Communities & Innovative Technologies Division of Science, Research & Technology 401 E State Street,