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PUBLIC YiEALTH SERVICES <br /> SAN JOAQUIN COUNTY <br /> ENVIRONMENTAL HEALTH DIVISION ' <br /> Karen Furst, M.D., M.P.H., Health Officer i <br /> 304 East Weber Avenue,Third Floor• Stockton, CA 95202 hi <br /> 304 <br /> 209/468-3420 FILE COPY <br /> JOE TOSTE <br /> TOSTE FARMS JUL 0 7 1998 <br /> 2480 TOSTE ROAD <br /> TRACY CA 95376 <br /> Re: Grant Line Gas and Food Site Code 1580 <br /> 2420 Grant Line Road <br /> Tracy CA 95376 <br /> San Joaquin County Public Health Services, Environmental Health Division <br /> PHSIEHD has reviewed the "Quarterly Report-January 1998 dated April 2, <br /> 1998, which was prepared for the above referenced site by Advanced <br /> Geo Environmental and received by PHSIEHD on April 9, 1998. PHSIEHD has <br /> the following comments for your consideration and action. <br /> The report included the results of the January 1, 1998 groundwater monitoring <br /> and sampling event. Groundwater contamination continues to be evidenced and <br /> continues to remain undefined. The analysis of the groundwater samples by <br /> EPA Method 8260 evidenced Methyl Tertiary Butyl Ether (MTBE) concentrations <br /> of 72 ppb (MW-1), 320 ppb (MW4) and 260 ppb (MW-5). The analysis of <br /> groundwater samples by EPA Method 8020 evidenced Benzene contamination <br /> of 14 ppb (MW-1), 1.6 ppb (MW-2), 14 ppb (MW-4) and 1.1 ppb (MW-5), and <br /> TPH diesel concentrations of 3400 ppb (MW-4) and 11,000 ppb (MW-5). <br /> Comparisons in contamination concentrations with the October 29, 1997 <br /> groundwater monitoring and sampling event suggest that the plume is continuing <br /> to migrate towards the northeast. <br /> AGE suggested in the report that determination of the suitability of this site for <br /> closure should be made at this time. In light of the above referenced <br /> contamination, PHS/EHD would not concur with closure of this site. <br /> In a letter dated June 18, 1997, PHSIEHD approved with modifications the "Work <br /> Plan Addendum" which was prepared for the above referenced site by AGE and <br /> dated June 10, 1997. The work plan addendum was prepared to further define <br /> the lateral extent of the hydrocarbon contamination in soil and groundwater, and <br /> proposed the installation of another groundwater monitoring well east of MW-5. <br /> The modifications requested by PHSIEHD included the installation of an <br /> additional well west of MW-4. The locations for both of these additional wells <br /> A Division of San Joaquin Counry Healrhh Care Services <br />