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I. STORMWATER FACILITY MAINTENANCE GUIDE Introduction What Is Stormwater Runoff? When urban and suburban development covers the land with buildings,streets and parking lots, much of the native topsoil, duff,trees,shrubs and grass are replaced by asphalt and concrete. Rainfall that would have soaked directly into the ground instead stays on the surface as stormwater runoff making its way into storm drains(including man-made pipes, ditches or swale networks), stormwater ponds,surface and groundwater and, eventually,to Puget Sound. What Is a Storm Drain System and How Does It Work? The storm drain system for most developments includes measures to carry, store, cleanse and release the stormwater. Components work together to reduce the impacts of development on the environment. Impacts can include flooding that results in property damage and blocked emergency routes, erosion that can cause damage to salmon spawning habitat and pollution that harms fish and/or drinking water supplies. The storm drain system provides a safe method to carry stormwater to the treatment and storage area. Swales and ponds filter pollutants from the stormwater by physically settling out particles, chemically binding pollutants to pond sediments and biologically converting pollutants to less harmful compounds. Ponds also store treated water,releasing it gradually to a nearby stream or to groundwater. What Does Stormwater Runoff Have to Do With Water Quality? Stormwater runoff must be treated because it carries litter, oil, gasoline,fertilizers, pesticides, pet wastes,sediments and anything else that can float, dissolve or be swept along by moving water. Left untreated, polluted stormwater can reach nearby waterways where it can harm and even kill aquatic life. It can also pollute groundwater to the extent that it requires treatment before it is suitable for drinking. Nationally,stormwater is recognized as a major threat to water quality. Remember to keep everything out of stormwater systems except the rainwater they are designed to collect. What Types of Stormwater Facilities Are There? Different types of ponds are designed for different purposes. For example,wet ponds primarily provide treatment of stormwater. Dry ponds or infiltration ponds are designed to provide storage for stormwater and allow for its gradual release downstream or into the ground. Roof infiltration trenches serve in infiltrate roof runoff directly into the ground reducing offsite stormwater discharges. Who Is Responsible for Maintaining Stormwater Facilities? All stormwater facilities require maintenance. Regular maintenance ensures proper functioning and preserves visual appeal. This Stormwater Facility Maintenance Guide was designed to explain SCOTT TAYLOR DRIVE SHORT PLAT September 7,2018 PAGE 5