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Labco Auto Body Repair Facility <br />Drainage Report, May 20, 1993 <br />Page 9 <br />Orifice #1, d„m„ = 0.12 ft or 1.54 inches, Use 1" orifice diameter per WSDF requirements. <br />See Hydrau!ic Permit Approval for Ted Lindsey, dated May 3, 1993. <br />Flow from 1" orifice with 3.54 head is 0.051 cfs. (J�' <br />Orifice #2, 25 year return frequency storm: <br />Discharge (Q) = Q25 - Q r «j = 0.1218 - 0.051, = 0:0 ds (%1' <br />Elev. 631.10 U <br />Overflow 832.84 <br />Height 1.54 ft �bt % <br />Orifice #2, dwm„ = 0.11 ft or 1.32 inches use s, inch orifice <br />A4. oil -Water Separators <br />Oil -Water Separator #1 <br />For 5 year storm discharge, Qs= 0.12 cfs, or approx 53 gpm <br />For a 15 minute retention time at 53 gpm = 795 gal capacity, use 'lily Vault Model 557-SA, or <br />equivalent 1;i 1-4in 4' V n (n', rriv ('YA V c i-( U C'�" ✓ �. i I c.n <br />Oil -Water Separator #2 <br />Base on a ma)dmum anticipated washdown rate of 5 gal/day, use Utility Vault Model 25-SA <br />(8.8 gpm and 100 gal capacity). This separator is acceptable pre-hentment for the city of <br />Everett Industrial Treatment facility as indicated by Gene Bennet industrial pre-treatment <br />inspector on 5-5-93. <br />A5. Blo- iltration Swale <br />Bio-filtration Swale Calculations, See calculation worksheet attached. <br />(Attached) <br />pie <br />