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Iabco Auto Body Repair Facility <br />Drainage Report, February 21, 1993 <br />Page 9 <br />Orifice #2, 25 year return frequency storm: <br />Discharge (Q) = Q25 - QZ = 0.1218 - 0.0406 = 0.0812 <br />Elev. 629.54 <br />Overflow 631.99 <br />Height 2.45 <br />j Orifice #2, do,;rim = 0.3E ft or 4.3 inches <br />1 A4. Oil -Water Separators <br />Oil -Water Separator #1 <br />For 2 year storm discharge, QZ= 0.0406 cfs, or 18 gpm <br />For a 15 minute retention time at 30 gpm, use Utility Vault Model 660-SA, ( per Utility Vault <br />Catalog). <br />i <br />Oil -Water Separator #2 <br />For car wash area assume maximum flow 6.8 gpm, use Utility Vault Model 660-SA, ( per Utility <br />!f Vault Catalog). <br />A5. Grassed -lined Swale <br />Grassed -lined Swale Calculations, See calculation worksheet attached. <br />(Attached) <br />17RTEMRYVPS <br />