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Agreement No: <br />Project Title: <br />Recipient Name: <br />WVc-2017-Tuxni|-001 58 <br />Stormwater Outfall Water Quality xctrofitomign <br />City orTukwila <br />Page zof 34 <br />administers the clean-up efforts. The Green River is listed as impaired for dissolved oxygen and temperature and has a <br />Total Daily Maximum Load (TMDL) plan to address causes of the thermal pollution. The Green-Duwamish River is also <br />home to threatened Chinook salmon and bull trout, as well as other species of anadromous fish, resident trout and <br />other aquatic species. <br />The RECIPIENT has identified anumber ofstorm drain outfaUsthat discharge untreated stomnwatcrtothe Gneen' <br />DuwamishRker.OftheseoutfaUs, seven have been identified as candidate water quality retrofit project areas for <br />feasibility and alternatives analysis. The seven selected sites are representative of a number of other untreated basins <br />draining to the Green-Duwamish River; therefore, the findings of this analysis can be used as a template for cost <br />effective design and construction of future retrofits with similar conditions and challenges in the same area. These <br />challenges include flat topography with low -gradient pipes; outfalls within the tidal influence zone; and highly urbanized <br />area with potential utility conflicts. <br />The RECIPIENT will evaluate the seven outfaUareas and prioritize <br />runoff pollution levels within areas treated, cost, availability ofhght+of-wBased onthe findings <br />from the feasibility and alternatives analysis of the seven outfalls, the RECIPIEAT will complete 90-percenidesigns for a <br />minimum uffour outfaUsites. <br />Overall Goal: (l,0X]Ucharacter limit, includes spaces) <br />This project will help protect and restore water quality in Washington stonnwm1erimpacts from existing <br />infrastructure and development. <br />° <br />24 <br />