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Sierra-Pacific Groundwater Consultants, Inc. <br /> Geologists, Engineers, and Compliance Specialists l <br /> December 9, 1996 <br /> Mr. W.T. Nickerson, Project Manager <br /> Unocal ERS <br /> 2000 Crow Canyon Place, Suite 400 <br /> San Ramon, California 94583 <br /> Subject: Third-Quarter 1996, Quarterly Monitoring Report, Former PureGro Facility at 1905 North <br /> Broadway Avenue, Stockton, PureGro Site No. 771165, Unocal Order/Contract: 34402-1, <br /> Sierra-Pacific Project No. 94-055 <br /> Dear Mr. Nickerson: <br /> The Third-Quarter 1996 Monitoring Report is enclosed for your consideration. Copies have been sent to <br /> all the appropriate persons. Eight monitoring wells located at, or near, the former PureGro/Brea Broadway <br /> agricultural-chemical (ag-chem) facility were sampled and measured on 23-24 September 1996. Analytical <br /> results from this monitoring event are largely consistent with previous results. The water table lowered an <br /> average of 14.5 feet from the March 1996 levels. Ground water continues to flow south-southwest. <br /> The fumigant 1,2-DCP, and traces of other volatile halocarbon compounds, were detected in ground-water <br /> samples from MW-1, MW-2, MW-5, MW-6, and MW-8. 1,2-DCP concentrations appear to have <br /> originated from the north pond and tank farm areas. Traces of chlorinated (phenoxy) herbicides were <br /> detected in ground-water samples from MW-2, MW-5, and MW-8, with 21 ug/1 Dinoseb detected in a water <br /> ;ample from MW-8. Nitrate concentrations were detected in each of the water samples, and appear to be <br /> )roadly distributed within the uppermost saturated zone. <br /> lease call if you have any questions or further directives. <br /> ncerely, <br /> ERRA-PACIFIC GROUNDWATER CONSULTANTS, INC. <br /> n ephen app, CEG 1133 <br /> for Engineering Geologist <br /> /jb <br /> osures <br /> Jan Wagoner, Unocal <br /> Wendy Wyels, RWQCB <br /> Michael Infurna, San Joaquin County <br /> (916)933-1468 <br /> Windplay Drive,Suite 4 EI Dorado Hills,California 95762 <br /> (916)933-3197 FAX <br />