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State of Washington Department of Ecology <br />Agreement No: WQC-2016-Tukwil-00132 <br />Project Title: East Marginal Way South Stormwater Outfalls <br />Recipient Name: City of Tukwila <br />will redirect storm flows from the abandoned Jorgensen Forge outfall to the Boeing Z line outfall through a new <br />pump station and force main. The conveyed runoff will be treated using General Use Level Designation <br />(GULD) runoff treatment facilities before discharging into the Duwamish River via the Boeing Z line outfall. <br />The RECIPIENT also will line approximately 500 feet of existing leaky storm pipe connecting the GULD <br />facilities and the Boeing Z line outfall to prevent potential infiltration of contaminated groundwater into the now <br />city -owned conveyance pipe <br />Additionally, the RECIPIENT will replace approximately 0.25 acres of impervious surfaces with pervious <br />surfaces and a bioretention swale along EMWS. The project will reduce the amount of heavy metals, <br />polychlorinated biphenyls (PCBs), petroleum products, and other toxic contaminants that enter the Duwamish <br />River. <br />Overall Goal: <br />This project will help protect and restore water quality in Washington by reducing stormwater impacts from <br />existing infrastructure and development. <br />Page 2 of 41 <br />Version 10/30/2015 84 <br />