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`*4 Californi eegional Water Quality Co'.ol Board <br /> l\v- Central Valley Region <br /> Robert Schneider,Chair . 0 <br /> Linda S.Adams Arnold <br /> Secretaryfor Sacramento Main Office Schwarzenegger <br /> Environmental 11020 Sun Center Drive#200,Rancho Cordova,California 9567P6114 Governor <br /> Protection Phone(916)464-3291 •FAX(916)464-4645 <br /> hup://www.waterbouds.ca.gov/centraival ley <br /> • TO: Pamela C. Creedon FROM: Jim Barton <br /> Executive Officer Engineering Geologist <br /> Underground Storage Tanks <br /> Brian Newman Enforcement Unit II <br /> Supervisory Water Resources Control <br /> Engineer -}' <br /> SIGNATURE: 41t\ wtF <br /> Robert Busby 146 <br /> Senior Engineering Geologist <br /> DATE: 14 September 2006 <br /> SUBJECT: NON-CONCURRENCE TO SAN JOAQUIN COUNTY CASE CLOSURE <br /> REQUEST, ARCO SERVICE STATION NO. 760, 225 S. CHEROKEE LANE, <br /> LODI, SAN JOAQUIN COUNTY(CASE NO. 2) <br /> On 5 June 2006, 1 received the San Joaquin County Environmental Health Department's <br /> (SJCEHD) Case Closure Summary (attached letter) for the ARCO Service Station No. 760, <br /> 225 S. Cherokee Lane in Lodi (Site), with a request for closure concurrence from the <br /> Executive Officer of the Central Valley Regional Water Quality Control Board (Regional <br /> Board). I reviewed the Case Closure summary and the Site file, and do not recommend <br /> concurrence with the closure request. Below is a summary of the Site history and my <br /> comments. <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 /> SJCEHD with Regional Board concurrence in 1997. Case #1 did not include analysis <br /> for the fuel additive 1,2-Dichloroethane (1,2-DCA), and <br /> • Case #2, a second generation of USTs removed in 2002 with groundwater monitoring <br /> to the present, which does include the 1,2-DCA analysis. <br /> Case #1: At the Site (Attached Map), one 550-gallon waste oil UST was removed in <br /> September 1988. Subsequently two 6,000-gallon and one 8,000-gallon gasoline USTs, one <br /> 550—gallon and one 400-gallon waste oil USTs were removed in June 1991 and in July 1991. <br /> After the 1991 USTs removal, four new gasoline USTs were installed in the gasoline tank pit <br /> and the station continued operations. Due to the presence of sands and silts beneath the <br /> Site, soil vapor extraction was the preferred soil remediation. At the conclusion of the soil <br /> remediation in 1997, the consultant estimated the remaining residual contaminant mass in soil <br /> as 1,730 gallons of Total Petroleum Hydrocarbons as gasoline (TPHg) and 1,390 gallons of <br /> Total Petroleum Hydrocarbons as diesel (TPHd). The three onsite monitoring wells <br /> California Environmental Protection Agency <br /> �d Recycled Paper <br />