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ENVIRONMENTAL TECHNOLOGY VERIFICATION REPORT. STORMWATER SOURCE AREA TREATMENT DEVICE. THE TERRE HILL CONCRETE PRODUCTS TERRE KLEEN™ 09
PENN STATE HARRISBURG. ENVIRONMENTAL TECHNOLOGY VERIFICATION REPORT. STORMWATER SOURCE AREA TREATMENT DEVICE. THE TERRE HILL CONCRETE PRODUCTS TERRE KLEEN™ 09 . EPA/600/R-06/136, 2006.
Verification testing of the Terre Hill Concrete Products Terre Kleen™ 09 was conducted on a 1.27 acre portion of the City of Harrisburg, Pennsylvania Department of Public Works facility. The Terre Kleen™ devices 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. According to the vendor, the device can remove 100% of particles 200 µm or larger when treating flows below 3.49 cubic feet per second (cfs). The verification challenge included collecting influent and effluent samples during 15 qualified storm events. A qualified storm event was defined as a minimum of 0.2 inches of rainfall, where representative sample aliquots are collected throughout the duration of the event and composited into a flow-weighted composite sample. The influent and effluent sampling areas were equipped with automated samplers and flow monitoring devices to collect and monitor the flows entering and exiting the device. The verification testing concluded that the system was capable of removing approximately 47% of sediment as determined by the total suspended solids (TSS) analytical procedure and 61% of sediment as determined by the suspended sediment concentration (SSC) analytical procedure. The primary difference between these two procedures is that the SSC analytical procedure is more likely to measure larger sediment particles as compared to the SSC analytical procedure. Additional particle size distribution analyses were conducted to verify the vendor’s performance claim. The combination of stormwater flow and particle size distribution data demonstrated that almost all of the particles 200 µm or larger were treated when the device treated flows 3.49 cfs or lower. There were instances where the flows exceeded 3.49 cfs and particles larger than 200 µm were untreated. The system was cleaned in March 2005 before the start of verification testing, and in January 2006 when two storms showed large negative removals. Maintenance consisted of vacuuming the water, sediment and debris from the sediment chamber. Sediment depths prior to pump-out were between 50% and 75% of the maximum design depth, measured at several points in the device.