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CENTRAL VALO% REGIONAL WATER QUAL f CONTROL BOARD ..JXSrZCT-10 1:1+V0RT 6 April 1992 DISCHARGER: BP OIL COMPANY, STOCKTON FACILITY LOCATION & COUNTY: STOCKTON FACILITY, SAN JOAQUIN COUNTY CONTACT(S): Jeff Withrow INSPECTION DATE: 10 March 1992 INSPECTED BY: Philip S. Isorena ACCOMPANIED BY: Jeff Withrow OBSERVATIONS AND COMMENTS: This inspection was conducted to ascertain the facility' s compliance with the Above- ground Petroleum Storage Act (APSA). The BP Oil Company, Stockton facility on Rough and Ready Island is a bulk storage facility for petroleum product distribution. These products include gasoline and diesel fuel . The facility has eight aboveground tanks (AGTs) and two underground tanks (UGTs) . All AGTs are constructed of welded steel . Two tanks contain additives and are each provided with separate concrete containment. The rest of the AGTs have foundation consisting either of a sand base with an asphalt seal or a concrete pad. All tanks are cathodically protected and provided with secondary containment. The containment area consists of a four-foot high concrete wall and compacted berms. My inspection found the facility clean and well-maintained. There were no apparent spills from the tanks or their associated piping. Most of the piping is aboveground. The only exceptions are SFPP pipes coming into the tank farm and pipes going to the two underground tanks which include pipes for the water draws, the additive tank contain- ment areas, and loading rack slab drain. The water draw consists of a valved pipe which discharges into a two square-foot sump which drains to a 6,000-gallon underground tank. There is an air gap between the discharge pipe and the sump. Further inspection revealed there was a puddle of storm water at the northwestern section of the tank farm. There is a locked valve which prevents the discharge of the storm water onto a vacant lot within the property boundary south of the Stockton Deep Channel and north of the tank farm. According to Mr. Withrow, storm water is typically allowed to collect in the tank farm and disposed of via evaporation. If necessary, storm water can be discharged onto the vacant lot. However, if storm water is contaminated it can be diverted into the 10,000-gallon underground tank which is also connected to the 17,000- gallon transmix tank. Currently, the latter is not being used and is available for storage. The wastewater collected in the two underground tanks is picked up by a licensed waste hauler and disposed of offsite. Table 1 summarizes information on each tank and observations made during my inspection. I obtained some additional information on these tanks during subsequent telecommunica- tion with Mr. Jeff Withrow. Figure 1 shows approximate tank locations.