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San Joaquin County DIRECTOR <br /> Donna Heran,REHS <br /> Environmental Health Department p ASSISTANT DIRECTOR <br /> P1. ' Laurie Cotulla,REHS <br /> 2• � .G 600 East Main Street.? �_ <br /> Stockton, California 95202-3029 PROGRAM COORDINATORS <br /> ..-1Carl Borgman,REHS <br /> !' Mike Huggins,REHS,RDI <br /> Website: www.sjgov.Org/ehd Margaret Lagorio,REHS <br /> ��FOR Phone: (209)468-3420 RobertMcClellon,REHS <br /> Fax: (209) 464-0138 ,teff Carruesco,REHS,RDI <br /> January 13, 2009 Kasey Foley,REHS <br /> 1 <br /> Mr. David Atwater <br /> Van De Pol Enterprises, Incorporated <br /> I Post Office Box 1107 <br /> Stockton, California .95201 <br /> 1 <br /> Subject: Pacific Pride—West Lane ~ <br /> 3230 North West Lane <br /> I Stockton, CA 95204. <br /> f , <br /> On December 3, 2008, the San Joaquin County Environmental Health Department (EHD) <br /> received preliminary results for the November-12, 2008 groundwater sampling event at the <br /> above-referenced site by email from Advanced GeoEnvironmental, Inc. (AGE). Significant <br /> concentrations of total petroleum hydrocarbons (TPH) quantified as gasoline (TPH-g) and <br /> benzene, and modest concentrations of toluene, ethyl:benzene, and total xylenes were detected <br /> in groundwater collected from monitoring well MW75R for the first time in the two years <br /> I MW-5R has been sampled. 1,2-Dichloroethane (1,27DCA) was detected at historical <br /> concentrations of 2.7 micrograms per liter (gg/L) in groundwater collected from MW-5R <br /> during this fourth-quarter sampling event. AGE request and the EHD approved the resampling <br /> J� <br /> of MW-5R on December 5,2008. . <br /> I AGE has recommended this site be considered for closure and a closure summary.report be <br /> prepared. Because of recent findings for groundwater samples collected from MW-5R, the <br /> ! EHD does not believe this site is ready for closure. Instead,.the EHD directs that MW-5R be <br /> monitored and sampled at least two additional quarters. The remaining monitoring wells onsite <br /> may be sampled annually since either low• concentrations or non-detect results have been <br /> reported.for groundwater,samples collected!from the rem'ining onsite wells. A closure report <br /> will be appropriate once it has been demonstrated that the concentrations of contaminants of <br /> j concern detected in groundwater samples from MW-5R were due to either cross contamination <br /> and that there is no transient petroleum hydrocarbon pplume moving toward the nearby <br /> municipal well, or was due to some other relatively:innocuous cause.. <br /> By letter dated May 7, 2007, the EHD approved removing total extractable petroleum <br /> hydrocarbons (TEPH) quantified.as diesel (TEPH-d) andquantified as motor oil (TEPH-mo), <br /> di-isopropyl ether (DIPE), ethyl tertiary butyl ether (ETBE), tertiary amyl methyl ether <br /> (TAME), tertiary butyl alcohol (TBA), 1,2-dibromoethane (EDB), ethanol, and methanol from <br /> I . <br />