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C <br /> Sierra-Pacific Groundwater Consultants Inc <br /> Geologists, Engineers, and Compliance Specialists ,R <br /> ,jl <br /> Jet <br /> December 9, 1996 ..a <br /> Mr. W.T. Nickerson <br /> Unocal, ERS . <br /> 2000 Crow Canyon Road, Suite 400 <br /> San Ramon, California 94583 <br /> Subject. Second Semi Annual 1996 Monitoring Report, 2130 West Washington Street, Stockton, Unocal <br /> Order/Contract: 3400001179, Sierra-Pacific Project No. 92-033 <br /> Dear Mr. Nickerson: <br /> The Second Semi-Annual 1996 Monitoring Report is enclosed for your information. Copies have been sent to <br /> all concerned parties. Not much has changed at 2130 West Washington Street. <br /> Near-surface ground water has flowed generally west since 1993. The potentiometric gradient on 18 September <br /> 1996 was 0.001. Water levels at up-gradient monitoring well MW-2 have exhibited the greatest seasonal <br /> variations due to localized ponding and infiltration of surface runoff. Nitrates detected in ground-water samples <br /> from monitoring wells MW-2, MW-3, and MW-8 originate from an off-site source. Water samples collected <br /> from the single, down-gradient, monitoring well(MW-7)have consistently contained little or no detectable nitrate <br /> concentrations. I am still convinced that elevated TDS levels detected in ground water samples from the site are <br /> largely related to upward migration of brackish connate water. <br /> Please let me know if you have questions or further directives. <br /> Sincerely, <br /> S RRA-PACIFIC GROUNDWATER CONSULTANTS, INC. <br /> Jc tephen R pp, CEG-1133 <br /> Senior Engineering Geologist <br /> JSR/jb <br /> Enclosures <br /> C. Jan Wagoner, Unocal <br /> Jack Holm, Cargill <br /> Charlene Wall, Port of Stockton <br /> Wendy Wyels, RWQCB <br /> Michael Inf irna, San Joaquin County <br /> (916)933-1468 <br /> 4911 Windplay Drive,Suite 4 El Dorado Hills,California 95762 (916)933-3197 FAX <br />