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PUBLIC "HEALTH SERVICES <br /> SAN JOAQUIN COUNTY <br /> r.- <br /> ENVIRONMENTAL HEALTH DIVISION y <br /> Ernest M. Fujimoto, M.D., M.P.H., Acting Health Officer <br /> 304 E.Weber Ave., 3rd Floor 0 P. O. Box 388 s Stockton, CA 95201-0388 <br /> 209/468-3420 <br /> SCOTT HOOTON <br /> ENVIRONMENTAL RESOURCES MANAGEMENT C(DPY <br /> BP OIL COMPANY <br /> BLDG 13 STE N <br /> 295 SW 41ST ST MAILED AUG 0 11995 <br /> RENTON WA 98055-4931 <br /> RE: BP OIL FACILITY #11193 SITE CODE: 1129 <br /> 3202 WEST HAMMER LANE <br /> STOCKTON CA 95209 <br /> San Joaquin County Public Health Services, Environmental Health Division (PHS/EHD) has <br /> reviewed the Quarterly Monitoring Report dated May 8, 1995 and the report of the baildown <br /> tests dated February 21, 1995 prepared by Alisto Engineering, in addition to your letter dated <br /> May 30, 1995, for the above referenced site. <br /> The last reported quarterly sampling occurred on April 21, 1995. The next scheduled quarterly <br /> sampling should occur in July, August or September and be witnessed by PHSIEHD. <br /> The laboratory report dated December 18, 1992 states "Please note that when analyzing your <br /> samples S-11.3-B2 and S-21.3-B2 a peak eluting earlier than Benzene and suspected to be <br /> Methyl Tert Butyl Ether (MTBE) was present at approximately 61 ppb and 260 ppb <br /> respectively." The soil analyses from B2 was Benzene .12 ppm at 21 feet. B2 was completed <br /> to MW-2 and as of March 3, 1995 had hydrocarbon concentrations in groundwater of TPH-g <br /> 2600 ppb and Benzene 96 ppb. PHS/EHD recommends that the issue of the suspected presence <br /> of MTBE be resolved either by additional testing or by verification of the existing data to be <br /> either conclusive or inconclusive. <br /> PHS/EHD has reviewed the February 21, 1995 baildown report and requests that the <br /> transmissivity of the aquifer be modeled in terms of plume migration and the feasibility of <br /> installing a groundwater remediation system. <br /> The lateral extent of the groundwater contamination has been defined by MW-4, MW-3, MW-7 <br /> and MW-6. The downgradient portion of the plume can be extrapolated from the data gathered <br /> from MW-6 and MW-7 which are both ND and off center of the confirmed downgradient <br /> direction for this site. An additional downgradient well may be required to determine the <br /> downgradient lateral extent of the plume. <br /> A Division of San Joaquin County Health Care Services <br />