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oUPON� DU PONT ENVIRONMENTAL REMEDIATION SERVICES 7068 Kola Center Parkway,Suite 401 w Pleasanton,CA 94566 (415)462-7772 March 19, 1991 Fax:(415)462-7944 Job No. 90-015-133 Ultramar Inc. 525 West Third Street Hanford, California 93232 ATTENTION: Mr. Glenn R. Dembroff Manager, Marketing Environmental SUBJECT: Quarterly Ground-Water Sampling Report First Quarter 1991 Beacon Station 695 900 South Cherokee Lane Lodi, California 'Dear Mr. Dembroff: INTRODUCTION " This report presents the results of the quarterly ground-water sampling which was conducted at Beacon Station 695,located at 900 South Cherokee Lane,Lodi, California (see the Location Map, Figure 1), on February 12 and 13, 1991. The purpose of this sampling program is to monitor and evaluate the extent of hydrocarbon contamination in the ground water at the subject property. } SUMMARY ` T. A summary of data regarding ground-water levels for the first quarter 1991 is presented in Table A. In general,ground-water levels have risen approximately 1.2 feet since the last quarterly sampling. The e ground-water gradient for this quarter is_directed towards the southwest at a magnitude of approximately 0.003 foot per foot (see tha Ground-Water Gradient Map, Figure 2). Concentrations of petroleum hydrocarbons continue to be maximum in the area of MW-8 and MW-17 which contained 0.04 foot and 2.38 feet of floating product, respectively (see Table B and Appendix A). Figure 3 presents interpretive isopleths of benzene concentrations within the ground water for the site. This site was scheduled for second quarter sampling by DERS during May 1991. However,based on Ultramar-'s letter slated January 21, 1991, DERS will no longer be conducting ground-water sampling at this site. -this will be the last quarterly ground-water sampling-report from-DERS E Better Things For Better Living I s'