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PUBLIC STH SERVICES <br /> $AN JOAQUIN COUNTY � z <br /> ENVIRONMENTAL HEALTH DIVISION <br /> Karen Furst,M.D.,MTH., Health Officer <br /> 3.0 East Weber.Avenue;Third Floor • Stockton,CA 9S' <br /> 209/468.3420 <br /> FIDE COPY <br /> aOR TC3:S7E: JFC ,SAN O : <br /> T.6 t.E; PAWS <br /> 248:0 I!OST8 ROAD <br /> TRA-T `OA .9,53.716: <br /> RE C.u'rtiss;Pontiac-Cadillac SITE.CODS : 1.877 <br /> :A Toste Road <br /> Tracy Cid► 95376 <br /> San Joaquin County Public.Health Services, Environmental Health Division <br /> (IHS/EHD)ihag.reviewed.the "Work Plan Addendum"which was submitted to <br /> this office try Ad�ranced GeolEnvironrnental, Inc. on behalf of the above <br /> referenced site (received on 12lW98) and has the following.oornments for your <br /> consideration and action.,. <br /> Irl correspondence dated October 8, 1988, PHS/EHl3 requested a work plan be <br /> submitted to complete the vertical and lateral assessment of the hydrocarbon. <br /> contamination that has been documented at this site, not an addendum. <br /> .Addendum's are requested and generally submitted to make modifications to an <br /> existing work plan This site has no such current unimplemented work plan an <br /> file, <br /> Vertical contaminant definition remains to be made at this site, both in soil and <br /> groundwater. Sail borings B-3, B-4 and B-5 and monitoring well MW-1 all had <br /> detectable levels of benzene in the deepest soil sample analyzed. Vertical <br /> definition is generally considered to have been made after two consecutive five- <br /> foot interval samplesare found to be noel-detect for the contaminants in question. <br /> Ground water monitoring well MW-1, which is screened from 5-30 feet below <br /> surface grade (bsg), evidenced benzene contamination above the maximum <br /> contaminant level at the most recently documented monitoring event (09/28/98). <br /> Paragraph three of the addendum states"Soil contamination has been defined <br /> laterally by soil collected from wells MW-3, MW-5 MW-6 and soil borings 131 and <br /> BW, As there exists absolutely no;documented soil analysis results from either <br /> 81 or MW-5, these points cannot be used. In addition, lateral contaminant <br /> definition cannot be evaluated until the vertical definition is known;. <br /> The addendum recommends that one monitoring well be"installed north of the <br /> site by the procedures outlined in the Site Contamination Work Plan prepared for <br /> the site, dated February1995" This work plan suggested a sail boring be drilled <br /> ;approximately tHirt- feet north of the excavation and completed.as a monitoring <br /> A iNvision dSajoaquin County Health Care Services <br />