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6.2 Prediction ill Characteristics — 40 CFR 112.7(b) KRC TRACY PLANT spill scenarios are described below and summarized in Table 2 "POTENTIAL SPILL SCENARIOS". All surface drainage from the industrial portion of the site is directed by gravity into a large unlined basin southeast of the site, where it is held until reused or evaporated. The highway diesel fuel 10,000 GA AST is a STI Fireguard double walled steel tank, with sufficient volume to contain the contents of the internal 10,000 GA tank. The off-highway diesel fuel 500 GA AST is a double walled steel tank, with sufficient volume to contain the contents of the internal 500 GA tank. In a worst case scenario, the primary tank and surrounding secondary containment would both be compromised. Spillage from fuel storage area would flow to the PCC paved surface under and about the tank. Discharge would then flow northeastward to the retention pond used for storm water collection. The pond would collect and store the discharge until manually drained or pumped. Other potential spill scenarios associated with the diesel fuel ASTs include leakage from fittings and piping associated with the tank and dispenser, minor pipe leakage due to corrosion or weld failure and overfilling during fuel product transfer operations. The dispenser and related piping are located above ground with visual exposure of all piping to the dispenser. The purpose of the inspection between the tank and the secondary containment is to identify any leakage. If a significant quantity fuel leaks prior to discovery, it will be captured in the secondary containment portion of the tank system and should be apparent at the time of inspection. The 10,000 GA AST's fill point is readily accessible at an enclosed waist level fill connection. Minor spillage when disconnecting the supplying delivery hose may occur but the manually controlled nozzle is shut prior to removing nozzle and any spillage should be captured in the enclosure cabinet. The 500 GA AST's fill point is readily accessible at top of tank fill connection. Overfilling of the 10,000 GA diesel AST is limited by a float actuated valve possible as flow into The 500 GA AST is not restricted to 90% of the AST capacity. In the event the inflow is not curtailed, relief at the tank emergency relief vents would relieve internal pressure and release fuel noticeably. Fuel would cascade down the side(s) of the tank and be intercepted by the pavement. ?i . .. r,F ., ,,.: , , V.t 10 'I ........ --- -.