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Spill Prevention, Control and Countermeasure Plan Tesla Treatment Facility Page 26 of 45 At the Emergency Power Generation Facility specifically, stormwater runoff and drainage is diverted via storm drain inlets,culverts and underground piping to a storm drain inlet located south of the bulk storage tanks and loading/unloading area. From this storm drain inlet, drainage flows southward via a 15-inch underground stormwater sewer pipe to discharge into the retention basin. Any spill or discharge not captured by secondary containments nor spill response material, and not pooled or absorbed by ground cover around the discharge source, could potentially flow and enter a nearby storm drain inlet and discharge into the retention pond. At the substation transformer on the south side of the Electrical Building, any spill or discharge not captured by secondary containment nor spill response material, and not pooled or absorbed by ground cover around the discharge source could potentially flow and enter a storm drain inlet located south and downslope of the substation transformer. The storm drain inlet is engineered to drain via underground sewer piping into the retention basin. The retention basin along the south side of the Tesla Treatment Facility provides for capturing oil discharge from the facilities before flow continues eastward and offsite. 2.7 Containment/Diversionary Structures and Equipment [40 CFR§112.7(c)] The following containment and/or diversionary structures and equipment are in place to contain and control discharges at the Tesla Treatment Facility: • Double-wall tank construction at the Emergency Power Generation Facility, each tank having an outer shell designed to contain one-hundred-and-ten percent(110%)of the inner shell capacity. • The fill port for the bulk storage tanks is equipped with a containment box designed to capture leaks and drips from the piping/hose connections during loading/unloading. The Simplex pump boxes are designed to contain drips or small spills. • Valves and pipe caps at secondary containments in the Emergency Power Generation Facility. • The Emergency Power Generation Facility and the substation transformer area at the Electrical Building are gently sloped so that any discharge of oil would tend to collect around the source, flow outward from the source would be relatively slow and facilitate spill response and cleanup. • The Emergency Power Generation Facility and substation transformer area at the Electrical Building are engineered to drain to storm drain inlets that discharge into the retention pond along the south side of the Tesla Treatment Facility, part of the stormwater collection and drainage system. In the event of an oil discharge,the retention pond provides for capture and containment before flow continues eastward and off the property. • Sorbent, booms and other spill control and containment materials are available for rapid deployment and containment in the event of an oil discharge.