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l yr <br /> 1 i <br /> L�ACalifornia Sgional Water Quality Cool Board <br /> Central Valley Region Arnold <br /> Linda S.Adams Karl E. Longley, Scl), P.E., Chair Schwarzenegger <br /> Secretary for Governor <br /> Environmental ---- <br /> Protection 11020 Sun Center Drive#200, Rancho Cordova,California 95670-6114 <br /> Phone(916)464-3291 •FAX(916)464-4645 <br /> http.//w .waterboards.ca.gov/centralvalley <br /> TO: File: ARCO Station No. 0760 FROM: Jim Barton <br /> 225 South Cherokee Lane Engineering Geologist <br /> Lodi, San Joaquin Co. UST Unit 2 <br /> DATE: 15 December 2009 SIGNATURE: <br /> SUBJECT. UST CASE CLOSURE, ARCO STATION 00760, 225 SOUTH CHEROKEE <br /> LANE, LODI, SAN JOAQUIN COUNTY(CASE # 390330). <br /> Site Background <br /> Former ARCO Station #0760 (Site) is currently a vacant used car dealership and auto <br /> repair/smog testing shop, and is located on the northeast corner of South Cherokee Lane and <br /> East Oak Street in Lodi, San Joaquin County (Attachment 1). Atlantic Richfield Company <br /> (ARCO, a BP affiliate), operated the service station prior to 1988 until 2002, when the Site was <br /> sold to the current owners Gulpreet Dhatt and Kuldeep Dhatt of Lodi, CA. <br /> There are two underground storage tank (UST) cases associated with this Site: <br /> • Case #1, a first generation of USTs removed between 1988 and 1991, and closed by <br /> the San Joaquin County Environmental Health Department (SJCEHD) with Regional <br /> Board concurrence in 1997. Case #1 did not include analysis for the fuel additive <br /> 1,2-dichloroethane (1,2-DCA), and <br /> • Case #2, a second generation of USTs removed in 2002 with groundwater monitoring <br /> to December 2008, which does include the 1,2-DCA analysis. <br /> Case #1: One 550-gallon waste oil UST was removed in September 1988. Subsequently, two <br /> 6,000-gallon and one 8,000-gallon gasoline USTs, one 550—gallon and one 400-gallon waste <br /> oil USTs were removed in June 1991 and July 1991. Approximately 300 cubic yards of soil <br /> was disposed offsite at an unnamed location. Maximum soil confirmation concentrations were <br /> total petroleum hydrocarbons as gasoline (TPHg), 5,700 mg/kg; TPH as diesel (TPHd), <br /> 560 milligrams per kilogram (mg/kg); TPH as oil and grease (TPHmo), 1,600 mg/kg; benzene, <br /> 5.4 mg/kg; toluene, 7.5 mg/kg; ethylbenzene, 54 mg/kg; and xylenes, 410 mg/kg After the <br /> 1991 USTs removal, four new gasoline USTs were installed in the gasoline tank pit and the <br /> ARCO station continued operations. Eight soil borings (B-1 through B-8) were advanced <br /> between May 1990 and January 1991 . Maximum soil concentrations were TPHg, <br /> 5,500 mg/kg; TPHd, 4,300 mg/kg; TPHmo; 303 mg/kg; toluene, 20 mg/kg; ethylbenzene, 34 <br /> mg/kg; and xylenes, 110 mg/kg. Due to the presence of sands and silts beneath the Site, soil <br /> California Environmental Protection Agency <br /> p�a Recycled Paper <br />