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rV West Coast Stot-m,lnc. Storm Water and EnWronmental Solutions County of Orange, OC Public Works Automatic Retractable Screen Excluders, Connector Pipe Screen Full Capture Trash Systems, and Catch Basin Inserts RFP# 080-591792 West Coast Storm Screen Automatic Retractable Screen Equipment Design and Specification Report (Information provided to the City as requested in the RFQ documents under Attachment A. Scope of TVorlc) A. Description/Design/Engineering. The West Coast Storm Screen (Automatic Retractable Screen) Device meets the minimum Hydraulic and Operation Criteria. The West Coast Storm Automatic Retractable Screen (ARS) prevents trash and debris from entering the catch basin during dry weather and moderate storm flows, thereby maintaining trash and debris within the street to be collected by street sweeping and other equipment. The ARS device opens automatically with minimal obstruction to the curb opening before the depth of the storm flow in the street exceeds 3 inches. This device is an approved ARS by the City and County of Los Angeles utilized in their on-going TMDL projects. The West Coast Storm Screen is designed, fabricated, and installed according to the County of Los Angeles specifications and is an approved device by the County of Los Angeles Department of Public Works Design Division specifications: "When in the open position, the ARS must not reduce the hydraulic capacity of the catch basin by more than 10% over the mid and high flow range of the catch basin." The West Coast Storm Screen devices are utilized in the current City of Los Angeles' mandated Regional Water Quality Control Board's Total Maximum Daily Load (TMDL) Catch Basin Opening Screen Cover Project. The County of Los Angeles is included in the City of Los Angeles' Contract with West Coast Storm, Inc. and all units are subject to daily shop and installation inspections to ensure our products meet the County and City specifications. Additionally, West Coast Storm, Inc. completed the County of Los Angeles River Trash Total Maximum Daily Load Full Compliance, Catch Basin Retrofit- Phase 4 Project, which included installation of CPS and ARS devices. Page 2 of 45 654 South Lincoln Avenue, San Bernardino, CA 92408 - Telephone 909.890.5700 Facsimile 909.890.5988 California General A/HAZ Contractor License Number: 888152 25C-23