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3.8 Illicit Discharges The SWPPP includes measures to identify and eliminate the discharge of process wastewater,domestic wastewater,noncontact cooling water, and other illicit discharges,to stormwater sewers, or to surface waters and ground waters of the State. During each monthly site inspection, signs of illicit discharges will be evaluated especially during dry weather. Each monthly site inspection will include: • Observations made at stormwater sampling locations and areas where storm water associated with industrial activity is discharged off-site;or discharged to waters of the state, or to a storm sewer system that drains to waters of the state. • Observations for the presence of floating materials,visible oil sheen,discoloration, turbidity, odor, etc.in the storm water discharge(s). • Observations for the presence of illicit discharges such as domestic wastewater, noncontact cooling water, or process wastewater(including leachate). • If an illicit discharge is discovered, Nelson Petroleum will notify Ecology within seven days. 3.9 Structural Source Control BMPs Condition S3 of the Industrial Storm water General Permit requires structural source control BMPs listed as "applicable" in Ecology's SWMNIs, or other guidance documents as mandatory. Structural Source Control BMPs for Fuel Distribution Systems: • The fueling areas have been designed to control spills. The concrete containment pad around the fueling island slope toward drains.The spill control/secondary containment vault was sized according to the largest container at the site in compliance with Section 7901.8 of the UFC. The largest container at the site is the tanker truck delivery vehicle and is 2,500-gallons in size; • In addition there are concrete containment pad with berm raised to a minimum of four inches surrounding each of the fueling areas designed to prevent the runoff of spilled liquids and to prevent run-on of stormwater from the surrounding area. • The fueling islands have canopies to prevent the direct entry of precipitation onto the spill containment pad. The canopy covers the spill containment pad to reduce the introduction of windblown rain. All roof drains to storm drains are conveyed outside the fueling containment area. • Stormwater collected on the fuel island containment pad is conveyed to the oil/water separators as a basic treatment BMP.The oil/water separators were retrofitted with"T" fittings at the direction of the City of Everett on June 26,2022.The oil/water separators were pumped and cleaned at that time. Discharges from treatment systems to storm I I