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BUFF DNT - <br /> DU PONT ENViAONMENTAL REMEDIATION SERVICES <br /> g 7068 Koll Center Parkway,Suite 401 <br /> Pleasanton,CA 94566 <br /> (41 5)462-7772 <br /> Fax:(4151462-7944 January 25, 1991 <br /> Job No. 90-Q14-133 <br /> Ultramar Inc. <br /> 525 West Third Street <br /> Hanford, California 93232 <br /> w, ATMIh710N: Mr.Glenn R.Demhroff <br /> Manager, Marketing Environmental <br /> SUBJECT: Quarterly Ground-Water Sampling Report <br /> Fourth Quarter 1990 <br /> Beacon Station 695 <br /> 900 South Cherokee Lane E <br /> Lodi, California <br /> Dear Mr.Dembroff: <br /> E <br /> INTRODUCTION <br /> j <br /> r.a <br /> This report presents the results of the quarterly ground-water sampling which was conducted at Beacon <br /> Station 695, located at 900 South Cherokee Lane, Lodi, California (see the Location Map,Figure 1), <br /> on December 18, 1990. The purpose of this sampling program is to monitor and evaluate the extent <br /> of hydrocarbon contamination in the ground water at the subject property. <br /> SUMMARY <br /> A summary of data rega.ding ground-water levels for the fourth quarter 1990 is presented in Table A. <br /> In general,ground-water levels have risen approximately 1.7 feet since the last quarterly sampling. The <br /> . ground-water gradient for this quarter is directed towards the southwest at a magnitude of <br /> approximate�y 0.009 foot per foot(see the Ground-Water Gradient Map,Figure 2)_ Chemical analytical <br /> results indicate concentrations of petroleum hydrocarbons continue to be maximum in the area of MW- <br /> 8 and MW-17 which contained 0.03 foot and 0.64 foot of floating product respectively(see Table B and <br /> — _——_ Appendix A).--Fj'gur!!-3-presents-interpretive-isopleths-of benzene-coneentrations within-the-ground---- — ---- -- - - <br /> wvter for the site. This site is scheduled for first quarter sampling by DERS during February 1991. <br /> Better Things For Better Living <br />