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�p rra� <br /> 40 RD <br /> a Pon# nviironmen Services October 31, 1989 <br /> Job No. 21!-Q9-6 <br /> Mr. Gregory Fletcher <br /> �. Conoco Inc. <br /> 600 North Dairy Ashford <br /> TR 3038 <br /> Houston, Texas 77079 <br /> SUBJECT: Quarterly Ground-Water Sampling Report <br /> September 1989 <br /> p- 900 South Cherokee Lane <br /> Lodi, California <br /> Dear Mr. Fletcher. <br /> INTRODUCTTQN <br /> .. This report presents the results of the quarterly ground-water sampling which was conducted at 900 South <br /> Cherokee Lane,Lody California(see the 1-ocation Map,Figure 1),on September 14, 1989. The purpose of this <br /> sampling program is to monitor and evaluate the extent of hydrocarbon contamination in the ground water at t <br /> the subject property. <br /> f <br /> SUMMARY <br /> t.a <br /> A summary of data regarding ground-water levels for the third quarter(September;1989)is presented in Table <br /> A. In general,ground-water levels have fallen an average of 4.I2 feet since the last quarterly sampling. Ground- r <br /> `N water flow for this quarter is directed towards the southeast with a gradient of approximately 0.04 (see the <br /> Ground-Water Gradient Map,Figure 2). Monitoring wells MW-8 and MW-17were not sampled because of the <br /> presence of free product. Monitoring well MW-19 did not recharge sufficiently after purging to obtain a sample. p <br /> Generally, chemical analytical results indicate that concentrations of petroleum hydrocarbons have remained <br /> celatively constant since the last quarter(see Table B and Appendix B). Figure 3 presents isrterpretive isnp;eths <br /> of benzene concentrations within the ground water for the site. This site is scheduled to be resampled during <br /> December, 1989. <br /> r - <br /> Respectfully submitted, <br /> DU PONT ENVIRONMENTAL SERVICES <br /> William E./Bassett <br /> Environmental Technician George Reid <br /> Certified Engineering Geologist <br /> CEG :068 <br /> WEB/G R:rw <br /> 7088 Kofl Center Parkway — Sulte 401 •Pleasanton,California 94566 772 <br /> _ (415)462-7 • <br /> --� _(_800)468-21_22 FAX{415)462-1949 <br /> Aston,Pennsylvania Pieas3rt0n,Cal,lomia f-orwa k.Ca rtomia Houslon,Te-as Boca Ra'c PomEda — <br /> J: <br />