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California Regional Water Quality Control Board <br /> l\- • Central Valley Region <br /> v Katherine Hart, Chair " <br /> Linda S.Adams Arnold <br /> 11020 Sun Center Drive#200,Rancho Cordova,California 95670-6114 <br /> Secretary/ Phone(916)464-3291 •FAX(916)464-4645 Schwarzenegger <br /> Environmental <br /> l hftp:/Iwww.waterboards.ca.gov/centralvalley Governor <br /> Protection <br /> TO: File: Geweke Land Development FROM: Jim Barton <br /> and Marketing Engineering Geologist <br /> 16 South Cherokee Lane UST Unit 2 <br /> Lodi, San Joaquin Co. <br /> r <br /> SIGNATURE: <br /> DATE: 18 October 2010 Z <br /> SUBJECT. UST CASE CLOSURE, GEWEKE LAND DEVELOPMENT AND MARKETING. <br /> 16 SOUTH CHEROKEE LANE, LODI, SAN JOAQUIN COUNTY(CASE # 390006). <br /> Site Background <br /> Geweke Land Development and Marketing (Geweke) property (Site) is currently a vacant used <br /> car dealership located on the northeast corner of South Cherokee Lane and East Oak Street <br /> in Lodi, San Joaquin County (Figure 1). Geweke purchased the former Gas and Save service <br /> station from San Diego Armour Oil Company (SDAOC) in September 1985 and converted the <br /> property into Geweke Ford Used Cars. <br /> Prior to September 1985, two 10,000-gallon and one 6,000-gallon gasoline and one <br /> 1,000-gallon waste oil underground storage tanks (LISTS) were removed by SDAOC from the <br /> Site. Confirmation soil samples were not collected during the UST removals; however, in <br /> September 1985, one monitoring well (MW-1) was installed in the waste oil UST tank pit. <br /> Subsequently from October 1985 through October 2005, twenty one additional monitoring <br /> wells (MW-2 through MW-22) and fifteen remediation wells (VW-1 through VW-7, OW-1 <br /> through OW-6, OW-1 R that replaced damaged OW-1, and EW-1) were installed at the Site <br /> (Figure 2). Maximum groundwater monitoring results are reported in micrograms per Liter <br /> (ug/L) in Table 1 below. <br /> Sample Date TPHg Benzene Toluene Ethylbenzene Xylenes :1,2-DCA� TBA <br /> September 1985 NA 20 10 NA NA NA <br /> October 1985 56,000 7,400 624 NA 4,960 NA <br /> February-July 11,000 1,100 1,100 1,500 13,000 NA <br /> 1986 <br /> June 1993 8,800 770 120 1.3 240 NA <br /> March 1998 1,400 3.2 1.6 6.3 21 80 <br /> March 2004 4,400 12 2.8 56 268 40 54 <br /> July 2009 3,300 1 ND ND 1 1 1 92 ND I ND <br /> 1:TPHg=total petroleum hydrocarbons as gasoline 2: 1,2-DCA=1,2-dichloroethane 3:TBA=tertiary butyl alcohol <br /> 4: NA=not analyzed 5: 1,2-DCA analyzed by Regional Board lab during split groundwater sampling 6:ND=non-detect result <br /> California Environmental Protection Agency <br /> �Recycled Paper <br />