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• i <br /> PUBLIC WORKS <br /> PROJECT REVIEW MEMORANDUM <br /> TO: Sabrina Fandler <br /> FROM: Jane Zimmerman <br /> DATE: August 17, 2018 <br /> SUBJECT: PW1808-008, Zillah 2-lots <br /> I have the following review comments on the submittals for the subject project: <br /> An open-surfaced wet pool, detention and infiltrating facilities, including bioretention <br /> systems, require a 10' setback from the maximum water surface elevation to a sanitary <br /> sewer main or service. <br /> The storm drain located in 1st Street to the south of this project must be extended to the <br /> site. <br /> The amount of"run-on"from adjacent properties into the alley and to Zillah St adjacent <br /> to the project must be quantified and the contributory area shown in the drainage <br /> report. The design of the drainage system must adequately account for this <br /> contributory area. <br /> The on-site stormwater management, flow control and runoff treatment BMPs <br /> proposed for this site must comply with all applicable infeasibility criteria found in the <br /> City's SWMM for the type of BMP proposed and must also meet all access and setback <br /> requirements found in the City's DCSS. <br /> Per the City's SWMM, bioretention is considered infeasible: <br /> - on slopes greater than 8% (which would exclude the east-west segment of the <br /> planter swale along Zillah St and the bioretention cell receiving the alley runoff) <br /> s:\jzimmerm\word\pr_8417 Evg Way ( OP <br />