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i6m5 r^r CCVtACI 611 a OJt' 54-;11 rxud J„ Lt rdo(n..-5rco1; <br />• ^ ' pr r taw, -c mcru tit f a; I. <br />MEMORANDUM <br />TO: Gordon Witcher <br />FROM: Jane Zimmerman <br />DATE: November 19, 1992 <br />SUBJECT: Plan Review, SEPA 92-36, Vehicle <br />Emissions Inspection Station <br />Per condition 17, a baffle -type oil/water separator is <br />required in series with a vegetated Swale to provide <br />U.- treatment of stormwater from paved areas. Alternately, a <br />wetpond may be provided. The facilities must meet City <br />standards. <br />Per condition Nlo, development of the site must not <br />adversely affect the hydrology of the site's wetland. The <br />W w quantity and rate of water entering the wetland must be <br />4,I determined for current conditions. Under developed <br />Nre , conditions a similar rate and quantity of roof drainage or <br />f ev'r ,.,t treated runoff must continue to be discharged to the <br />ntan n� wetland. Prior to application for building permits and plan <br />I' J review by the Public Works Department, a characterization of <br />✓/ the hydrology of the wetlands) on or adjacent to this <br />project that may be affected by the development of this site <br />must be submitted to and approved by the Planning <br />Department. <br />CALCULATIONS <br />Detention: <br />The detention system must meet both city standards and <br />Department of Fisheries standards. The City uses a 10 year- <br />25 year criteria in the Swamp Creek drainage basin. <br />�- Therefore, the secondary orifice should be sized so that the <br />combined release from it and the primary orifice does not <br />exceed the rate from the 10 year predeveloped storm for the <br />25 year developed storm. Additional storage must be <br />provided as necessary. <br />The minimum orifice size allowed by the City on privately <br />, detention systems is 1 inch. <br />�lJ�ljJ DEC 2 2 1.., <br />CIl ' G' EVU-,[I i <br />UICN• Pdn,;it Comet r <br />