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Canary #Orwtgc, OC Public Works M4.004501108 <br />Unired,iMrm Water 104 <br />himb selected Contractor will be under contract with the County of Orange's QC Public Works <br />Department and OCTA, but will take primary direction from local agency. Conowlnr's will directly <br />invoice and bepaid by tho loerd agouoy. <br />W. ELICIBISrry QUALIDICATIOM <br />Stormwater Treatment Davlees must be capable of handling flaws from a design storm of ol- <br />his bmilsour. <br />The hydrologic method to be used to coloulaw the flow associated with LM and water quality design <br />storm flow ia: <br />FnVjw =C x 7 x A <br />Where Purace = Vow capacity (cubic fmat/scc); C m moift' coefficient (ranges from it to 1); t m Q,2 <br />inches/hour and A =tributary area (arras). <br />Treatment devices should also be able to operate in a hydruulio sumbarge condition (defined as a <br />condition that exceeds the design discharge) without releasing stored pollutants to the receiving water, <br />Stormwater Treatment Devices which meet this definition and would ba eligible forconsidemtion am: <br />A. Hydrodynamle Sepnration and Gross Solids Removal Devices <br />Hydrodynamic separators am flow- thmugh situations with a settling or separation unit to tamove <br />sediments and other pollutants and arc widely used in swcoA afar homirm d, No outside power <br />Bourse is required, because the energy of the flawing water allows the sediments to efficiently <br />sapamta. Dependhtg on the type of unit, this separation may be by means of centrifugal form or <br />Indirect filtration. - <br />Gross Solids R=WNnl Devices (either linear turret or inclined swoon) we structural best <br />management premium designed to remove trash, vagmwtive metals[, and other partial" of <br />relatively large, gross size from smrsnwater nmelf. <br />& Catch Basin Inserts <br />Catch basin htseris are designed to remove oil and groasa, #ash, debris, and sediment and <br />impmvo the efficiency of catch basins. Some inserts aye designed to drop directly into existing <br />catch basins, while others may require retrofit conshuction. Several varieties of catch basin <br />inserts exist for filtering mooff. <br />C. Antomarde Retraemble, Screens <br />Automatic retractable careens are mounted inside a storm drum inlet and are designed to remain <br />closed to capture debris during the dry season. During storm events, the screens retract, allowing <br />heavy flows to enter the storm drain. <br />D. Cartridge Filter -type Control Devices <br />Cartridge fillo -type controls typically consist of a sari" of vertical filters contained in a vault or <br />catch basin that provide treatment through filtration and sedimentation, <br />P4ON Page <br />14 ej20 <br />