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S E C 0 R • 1 D 1J �LTJ July 31, 2006 AUG 0 2 2006 Ms Lon Duncan, ENVIRONMENT HEALTH Senior REHS PERMIT/SERVICES San Joaquin County Environmental Health Department 304 E Weber Avenue Stockton, CA 95202 Re Site Closure Report Former ARCO Station 4493 205 North Center Street Stockton, California Dear Ms Duncan Secor International Inc , (SECOR), on behalf of Atlantic Richfield Company, a BP Affiliated Company, has prepared this site closure report for the former ARCO Service Station Number 4493 (the Site) located at 205 North Center Street in Stockton, California This Closure Report has been prepared in response to a telephone request from you to Mr Vernon Elarth at URS Corporation (URS)on February 22, 2006 The following outlines the site background, • assessment activities, sensitive receptors, and conclusions and recommendations SITE BACKGROUND Former ARCO Station 4493 is located at 205 North Center Street in Stockton, California (Figure 1) Three 12,000-gallon underground storage tanks (USTs) were installed at the site in 1984 The service station was demolished, and the USTs were removed during the first quarter of 1999 The site is on property identified as Weber Point, the Stockton Channel is adjacent to the site to the south The City of Stockton has redeveloped the Weber Point area as a city park (Figure 2) PREVIOUS INVESTIGATIONS In July 1997, the San Joaquin County Environmental Health Department(SJCEHD)sent a letter to Atlantic Richfield Company stating that the former Shell service station approximately 300 feet east of ARCO Station 4493 had reported increasing concentrations of methyl tertiary-butyl ether(MtBE) in the Shell upgradient wells These wells were to the northeast of the ARCO station, northeast is a 4 dominant historical groundwater flow direction near the ARCO site The gasoline stored at the Shell station reportedly never contained MtBE The Shell site was granted closure by the California Regional Water Quality Control Board (RWQCB),and the groundwater monitoring wells at the Shell site were subsequently abandoned Excavation and removal of one waste-oil tank,three gasoline USTs,and associated dispensers and product lines were performed by Henderson Construction of Stockton, California on February 24, 1999 The excavated USTs consisted of three 12,000-gallon capacity tanks of double-walled fiberglass construction On April 13, 1999, one 300-gallon capacity waste-oil tank was excavated and removed The four USTs were hauled by ECI to their Richmond, California facility for disposal