The purpose of the proposed action is to provide King County with $70 million of loan funding to construct a storage facility and conveyance so that partially and untreated sewage mixed with rainwater (combined sewer overflow) can be routed for treatment before release into the Duwamish River through outfalls. The increased storage capacity will reduce the number of combined sewer overflows at two sites along the Duwamish River. Currently, based on a 20-year average, pollution overflows into the river 4.4 times per year at one site and 1.9 times per year at the other. The loan project locations are West Michigan Street Regulator Station (W Michigan St. RS) Overflow and Terminal 115 (T115) Overflow. These sites are part of the Environmental Protection Agency’s Superfund National Priorities List and the Washington Hazardous Sites List. Anticipated benefits from the investments made with this loan include: • The Lower Duwamish River will receive less pollution during severe rains because large volumes of sewage and rain runoff will be treated before discharge into the river. • Reducing the overflows to one per year at each site. Federal and state regulations require communities to reduce the frequency of untreated combined sewer overflows, on average, allowing no more than one overflow event per year. Reducing overflows benefits people, wildlife, and water quality because CSOs can carry contaminants such as pathogens, oxygen-consuming pollutants, solids, nutrients, and toxics.