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San Joaquin County <br /> .� Environmental Health Department DIRECTOR <br /> =+E"` Donna Heran, REHS <br /> zk 600 East Main Street <br /> Stockton, California 95202-3029 PROGRAM COORDINATORS <br /> Robert McClellon,REHS <br /> •�:: Jeff Carruesco,RENS, RDI <br /> Cq'••: -:.` �j�P Website: www.sjgov.org/ehd Kasey Foley,REHS <br /> ��FOR <br /> Phone: (209)468-3420 <br /> Fax: (209)464-0138 <br /> August 5, 2010 <br /> Mr. Jerry Moore <br /> Moore Petroleum <br /> 885 Portofino Drive <br /> Brentwood CA 94513-6539 <br /> Subject: Moore Petroleum Bulk Plant <br /> 5491 F Street <br /> Banta CA 95304 <br /> The San Joaquin County Environmental Health Department (EHD) has reviewed Confirmation <br /> Soil Vapor Survey Work Plan, dated November 11, 2009, and the analytical results for the <br /> second groundwater sampling event for monitoring wells MW-15 and MW-18; all submitted on <br /> your behalf by your consultant, Apex Envirotech, Inc. (AEI). <br /> The work plan was submitted in response to the EHD letter dated July 2, 2009, approving <br /> submittal of such a work plan to reevaluate the vapor intrusion; all seven soil gas samples <br /> collected during a previous investigation were impacted by total petroleum hydrocarbons <br /> quantified as gasoline (TPHg) and by benzene, toluene, ethylbenzene and xylenes (BTEX). One <br /> sample had a benzene concentration that exceeded the Environmental Screening Levels <br /> (ESLs) established by the San Francisco Bay Regional Water Quality Control Board for <br /> benzene. Also it was not clear to the EHD whether, or not the soil gas investigation had been <br /> conducted in the absence of active soil vapor extraction (SVE). <br /> AEI proposed in the work plan to collect five soil gas samples, four around the building on site, <br /> one across the street near the Rhodes residence. The samples are to be analyzed for TPHg, <br /> BTEX, the five fuel oxygenates, the lead scavengers 1,2-dichloroethan and ethylene dibromide, <br /> and the leak detector compound by Method TO-15. The EHD approves the proposed scope of <br /> work as adequate and necessary [H&S 25296.`10 (c)(3)] to resolve uncertainty regarding the risk <br /> and hazard potentially posed by vapor intrusion. The EHD also directs that proposed probe <br /> borings SVP-14 and SVP-15 also be sampled and analyzed for total petroleum hydrocarbons <br /> quantified as diesel (TPHd) as the soil in the area of those two probe locations had been <br /> impacted by TPHd. <br /> The groundwater samples collected from monitoring wells MW-15 and MW-18 had less than <br /> detectable concentrations of the chemicals of concern (CDCs) related to the unauthorized <br /> release (LIAR) from the former underground storage tank (UST) system on your site at the <br /> referenced address. Monitoring well MW-15 was installed to delineate the down-gradient extent <br /> of impacted groundwater; the recent analytical results demonstrate that the plume of <br /> groundwater impacted by your UAR is delineated in that direction. The EHD considers your <br /> groundwater plume to be adequately delineated. <br /> Directive Letter 0810 <br />