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Sierra-Pacific Groundwater Consultants, Inc. <br /> _ HIDROGEOLOGISTS&GEOLOGISTS <br /> 4 � � <br /> `'4 <br /> June 3, 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. Work Plan for the Installation of Monitoring Well MW-9 Near Chronicle Avenue, Former <br /> PureGro/Brea Facility at 1905 North Broadway Avenue, Stockton, PureGro Site No. <br /> 771165, Unocal Order/Contract: 34402-1, Sierra-Pacific Project No. 94-055 <br /> Dear Mr. Nickerson: <br /> A work plan to install monitoring well MW-9 is enclosed. MW-9 would be installed in the street <br /> at 1700 Chronicle Avenue, approximately 300 feet west of MW-5. Well-probe ground-water <br /> samples would be taken prior to installation of the terminal monitoring well. The plan would be <br /> to drill an 8-inch soil boring to the saturated zone (within the street) at 1700 Chronicle Avenue. <br /> A probe sample would be taken and submitted for 1,2-DCP laboratory analysis. If the sample <br /> results are determined to be negative, a standard monitoring well would be installed in the still- <br /> open soil boring. If 1,2-DCP is detected within the first well-probe water sample, the drill rig <br /> would be repositioned further west. Subsequent well-probe samples would be taken until the 1,2- <br /> DCP zero-line has been determined. A monitoring well would ultimately be installed within a <br /> neighborhood street beyond the 1,2-DCP zero-line. <br /> Please call if you have any questions or further directives. <br /> Sincerely, <br /> SIERRA-PACIFIC GROUNDWATER CONSULTANTS, INC. <br /> 1 <br /> J Stephen app, CEG-1133 <br /> S for Engineering Geologist <br /> JSR/jb <br /> Enclosures <br /> C. Jan Wagoner, Unocal <br /> Wendy Wyels, RWQCB <br /> Mike Infurna, SJCPHS r <br /> (916)933-1468 <br /> 4911 Windplay Dnve.Suite 4 EI Domdo Hills.Califomia 95762 (916)933-3197 FAX <br />