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Valley Pacific Petroleum Services Stockton,CA Spill Prevention,Control,and Countermeasure Plan Tanks are dipped by the vendor prior to filling and a calculation is made to determine the number of gallons available to fill to reach the 90%. Tank 2 (EXEMPT) is made of steel, which has been welded to form their cylindrical shape. The tank was constructed in accordance with local codes and industry standards at the time of their construction. The tanks is a double-walled, fiberglass shell construction. Tanks are dipped by the vendor prior to filling and a calculation is made to determine the number of gallons available to fill to reach the 90%. b. Facility Drip Pans Fill ports for all AST's rest on a concrete pad or have containers beneath to allow for visual inspection and contain small leaks from the piping/hose connections. c. Storm Water Retention Pond An on-site storm water retention pond add additional secondary containment for the site in the event of a spill. The approximate size of the basin was determined to be around 505,000 gallons. The Precipitation Frequency Data Server (PFDS) was used to determine the 25 year-24 hour precipitation information. For the site the 25 year-24 hour storm was determined to be 2.87 inches. Reference Appendix B for the site calculations. The total storm water storage required for the site is approximately 317,000 gallons. The retention pond has a remaining 188,000 gallons of storage. 110% of the largest tank volume (12,000 gallons) on-site is 13,200 gallons of addition storage required. As seen above and in Appendix B the 188,000 gallons is more than adequate to contain a major spill on-site if it were to occur. The retention pond acts as added protection since all tanks on-site are either double or triple-walled tanks. d. Tank Truck Unloading and Equipment Loading Areas Valley Pacific Petroleum Services employees are only allowed access to oil facilities. Their oil products are supplied by outside suppliers. The delivery drivers park at the concrete pump pad to deliver products to the bulk fuel area. The driver use drip pans when unloading products. The management team is committed to ensuring the safe transfer of material to and from storage tanks. The team implements the following measures to prevent oil discharges during tank truck unloading and equipment loading areas operations. The Facility Manager or his/her designee supervises oil deliveries for all new suppliers, and he/she periodically observes deliveries for existing, approved suppliers. All unloading of tank trucks and loading of equipment takes place only in the designated loading areas. 0 7