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CounanlOrar��nr t2Clrrebfte Wurha Nf.AA80,XSOXXi4a <br />UaltrASnaria linter %�. <br />inch selected Contractor will be under contract with the County at Orange's GO public Works <br />Department and DCTA, but wilt take primary direction flrsm local agency. Contractor's will directly <br />invoke and bePAld by the local agettoy. <br />Ili UU0111MOVQOAI.IBICA'CIONd <br />Stormwator 'treatment Devices must be capable o€ haudiing flows tinm a design stoau of o,2, <br />inaltosAour. <br />The hydrologic method to be road to ealculme the flew aagaolafsd with LID and water quality design <br />storm £IoW is: <br />F.,o,a=C k 19 <br />Where prrareal - plow anpaolty (cubic lroNaea); C - runoff Coefficient (venom from 0 to 1); 0,2 <br />Inches/hour, and A =tributary area (gems), <br />TrEohnent devices should also be able to operate In a hydraulic sauohorge, condition (definAd as a <br />condition that exceeds the design discharge) without releasing stared pollutants to the receiving water, <br />Stormwater Treatment NO= which meet this definition and would be eliffIbbo for consideration one <br />A, Jlydrodynumie Separation and Gross Solids Immoral Devices <br />Hydrodynamic separators am flow - through Structures With a solding at sepanHon unit to remove <br />sediments and other pollutants and are widely used in stonnwnter smgmaant, Na outside paws, <br />source is required, because the energy of the flowing water allows the augments to efficiently <br />separate. Depending an the type of milt, this separation may be by mesas of centrifugal torso or <br />ladireat flirtation, <br />Oroes Solids Remmal Devices (either linear radial or inclined screoa) are shuohuut beat <br />management pmetlses designed to remove Hush, vegetattvC material, and other parMes of <br />relatively targa, goes size from stormwater,nmoff <br />B. Catch Basin Inserts <br />Catch basin Inserts am designed to remove oil and groaso, loah, debris, and sediment and <br />improve the of blency, of catch boeins. Roma Imetrs are designed to drop directly Into existing <br />catch Lades, white others may rognim retrofit cansuvrdon. Sevand varieties of catch basin <br />insorts exist for filtering ruuoll. <br />C. AutommNc RetraMolale Screens <br />Automatic retractable Orleans Are mounted inside a storm dome mint and are designed to remain <br />closed to capture debris during the dry mosom Doing storm events, the sonams; mhaat, allowing <br />heavy flows to eater ties atone drain. <br />D. CartridgaBlltaz type Control Devices <br />Cartridge tutor -typo controls typically consist of a sorks of vertical filters contained in n vault or <br />catch basin that provide treatment through fltmtion and sedimentation. <br />POWs page <br />1nof20 <br />20 <br />25C -24 <br />