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61tvv st St ol-m,Inc. Storm ff-'ater and Environmental Sohrtions 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 Work) West Coast Storm Automatic Retractable Screens Operation Criteria The ARS device swings open and remains open as long as the flow depth exceeds specified height and return to the mechanically locked and closed position as the flow of water recedes. The West Coast Storm Screen device meets the following criteria: 1) Screens cover the entire existing curb opening. The maximum clear opening between the top, bottom, and sides of the curb opening and the screen or frame of the screen shall be '/z inch. 2) The Device has no springs, pulleys, buckets, troughs or protruding tracks, thereby enabling the full capture trash system to function without obstruction. 3) In curb openings with support bolts, multiple units shall be installed between the existing support bolt(s) to span the entire curb opening width. 4) The existing support bolt(s) shall be protected in place and the operation of the units shall not be hindered by the support of the bolt(s). 5) The maximum clear opening between adjacent screens, adjacent fixed frame members, or between the screens and support bolts shall be ''h inch. 6) At no point in its range of motion shall any part of the screen or the operating mechanism interfere with the function of a CPS device or its bypass. 7) If any part of the frame of the unit is fixed and does not swing open, the maximum allowed width of the fixed part of the frame is 1.5 inches per side per unit. No fixed parts shall obstruct the top or bottom of the catch basin opening. 8) All screens shall be fabricated from twelve (12) gauge (0.105 inches), with %-inch diameter holes, and with a total open area of not less than 50 percent. 9) The edges of the screen shall be ground to remove all sharp edges. 10) The ARS device can be adjusted to open (unlock) at a specific height specified. 11) The operational (locking) mechanism is isolated from the storm drain and debris. A built in 0.50 inch gap between the main screen and ARS ends also insures the mechanism isolation. Page 3 of 45 654 South Lincoln Avenue, San Bernardino, CA 92408 - Telephone 909.890.5700 Facsimile 909.890.5988 California General A1HAZ Contractor License Number: 888152 25C-24