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t <br /> QON <br /> Du PONT ENVIRONMENTAL REMEDIATION SERVICES <br /> 7068 Koll Center Parkway,Suite 401 <br /> F!,easanton,CA 94566 <br /> (415!462-7772 <br /> Fax:(415)462-7944 August 6, '.790 <br /> Job No.211-012-6 <br /> Mr.Gregory P.Fletcher <br /> Conoco Inc <br /> .. i <br /> 600 North Dairy Ashford <br /> TR 3056 <br /> Houston,Texas 77079 <br /> - SUBJECT: Quarterly Ground-Water Sampling Report <br /> June 1990 <br /> Douglas Gas Station <br /> — 900 South Cherokee Lane <br /> _F Lodi,California <br /> Dear Mr.Fletcher: <br /> INTRODUCT70N <br /> This report presents the resuits of the quarterly ground-water sampling which was conducted at the <br /> -- Douglas Gas Station,900 South Cherokee Lane,Lodi,California(see the Location Map,Figure 1),on <br /> June 7, 1990. The purpose of this sampling program is to monitor and evaluate the extent of <br /> +-. hydrocarbon contamination in the ground water at the subject property. <br /> SUMMARY <br /> A summary of data regarding ground-water levels for the June 1990 quarter is presented in Table A. <br /> In general,ground-water levels have fallen approximately 2.7 feet since the Iast quarterly sampling. The <br /> ground-water gradient for this quarter is directed towards the south at a magnitude of approximately <br /> 0.002(see the Ground-Water Gradient Map,Figure 2). Monitoring wells MW-8, MW-10,and MW-17 <br /> were not sampled because of the presence of free product. Chemical analytical results indicate a slight <br /> increase in concentrations of petroleum hydrocarbons since the last quarter (see 'fable B and <br /> Appendix B). Figure 3 presents interpretive isopleths of benzene concentrations within the ground <br /> water for the site. This site is scheduled to be resampled during September 1990. <br /> Respectfully submitted, <br /> DU PONT ENVIRONMENTAL REMEDIATI SERVICES <br /> — --- -------- — - <br /> ---Mark-Vetter----- - - - ----- - - - ---David-J.._Blunt.— <br /> Project Geologist Registered Geologist - -- - —--------- -- <br /> RG 4516 <br /> Better Things For Better Living <br /> >f <br />