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ENVIRONMENTAL TECHNOLOGY VERIFICATION REPORT: STORMWATER SOURCE AREA TREATMENT DEVICE; PRACTICAL BEST MANAGEMENT OF GEORGIA, INC., CRYSTALSTREAM� WATER QUALITY VAULT MODEL 1056
Citation:
NSF INTERNATIONAL. ENVIRONMENTAL TECHNOLOGY VERIFICATION REPORT: STORMWATER SOURCE AREA TREATMENT DEVICE; PRACTICAL BEST MANAGEMENT OF GEORGIA, INC., CRYSTALSTREAM� WATER QUALITY VAULT MODEL 1056. U.S. Environmental Protection Agency, Washington, DC, EPA/600/R-05/085, 2005.
Description:
Verification testing of the Practical Best Management, Inc., CrystalStream™ stormwater treatment system was conducted over a 15-month period starting in March, 2003. The system was installed in a test site in Griffin, Georgia, and served a drainage basin of approximately 4 acres. The drainage basin had installed a storm sewer system with catch basin. No detention ponds are located upstream of the treatment system, and no pre-treatment of the stormwater was done prior to entering the treatment system. The drainage basin and the surrounding area's land use is mixed, with residential, commercial, and light industrial development. No major storage or use of hazardous materials or chemicals exist in the basin. The treatment system was instrumented with automatic samplers, area/velocity flow meters, and rain gauges. Verification testing included collecting data from 15 qualified storm events with rainfall depths of at least 0.2 in. Analytical parameters included: total suspended solids; suspended sediment concentration; total phosphorus; total Kjeldahl nitrogen (TKN); nitrate/nitrite, and; sand/silt split. Performance results varied widely for the indicated parameters. Total suspended solids removal efficiency ranged from -120 to 68%. Suspended sediment concentration efficiency ranged from -41 to 98%. In other analyses, total phosphorus was reduced by 40%, nitrate was reduced by 25%, and TKN was reduced by 13%. Verification testing revealed problems with the trash basket which is installed in the inlet to trap trash and debris. As debris accumulates in the basket, it restricts flow into the device. Inspections of the device in service may need to be made more frequently to determine if clean-out is necessary.