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Sierra-Pacific Groundwater Consultants, Inc. <br /> 1 HYDROGEOLOGISTS&GEOLOGISTS <br /> i <br /> April 29, 1996 s <br /> Ms. Wendy Wyels, Agricultural Regulatory Unit �3 <br /> Central Valley - Regional Water Quality Control Board y <br /> 3443 Routier Road, Suite A <br /> Sacramento, California 95827-3098 <br /> Subject: First-Quarter 1996 Quarterly Monitoring Report, Former PureGro/Brea Facility, 1905 <br /> North Broadway Avenue, Stockton, PureGro Site No. 771165, Unocal Order/Contract No. <br /> 34402, Sierra-pacific project No. 94-055.03 <br /> Dear Ms. Wyels: <br /> The First-Quarter 1996 Quarterly Monitoring Report for the PureGroBrea Broadway site is <br /> enclosed for your consideration. <br /> Nine monitoring wells located at,or near, the former PureGroBrea Broadway agricultural-chemical <br /> (ag-chem) facility were sampled and measured on March 20-21, 1996. A new well (MW-7) was <br /> added to the array. Analytical results from this monitoring event are largely consistent with <br /> previous results. The water table rose about 10 feet from December 1995 to March 1996, and has <br /> risen 30 feet since monitoring began in 1993. Ground water continues to flow southwest, away <br /> from the Stockton Diverting Canal. <br /> Laboratory test results indicate that 1,2-DCP and nitrate concentrations have migrated southwest <br /> from the subject site more than 300 feet. 1,2-DCP concentrations appear to originate from the <br /> north pond and tank farm areas. Nitrate concentrations were detected in each of the water samples <br /> tested, and appear to be broadly distributed within the uppermost saturated zone. <br /> Please call if you have any questions. <br /> Sincerely, <br /> SIERRA-PACIFIC GROUNDWATER CONSULTANTS, INC. <br /> J n to en p, C G-1133 <br /> S io Engineering Geologist <br /> JSR/cf <br /> c: W.T. Nickerson, Unocal <br /> Jan Wagoner, Unocal <br /> Michael Infurna, San Joaquin County <br /> 4911 Wind la Drive,$uite4 (9161933-1468 <br /> F Y EI Dorado Hills.California 95762 (916)933-3197 FAX <br />