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Y � <br /> Sierra Pacific Groundwater Consultants, Inc. <br /> HYDROGEOLOGISTS&GEOLOGISTS <br /> � - y <br /> June 29, 1995 <br /> 1995 <br /> ENv'RONMENT,gL N <br /> Mr. William P. Schuler, President p�RMlT�S�RVIC'Es <br /> Geo. F. Schuler, Inc. <br /> 1705 North Broadway Avenue <br /> Stockton, California 95205 <br /> Subject. East Stockton Ground-Water Investigation, Proposed Measurements and Sampling of a <br /> Monitoring Well at 1705 North Broadway Avenue, Stockton, CA, Unocal Order/Contract: <br /> 34402, Sierra-Pacific Project No. 94-055 <br /> Dear Mr. Schuler: <br /> The State of California has asked Unocal Corporation to define the extent of agricultural-chemical <br /> (ag-chem) concentrations known to be present in shallow ground water at an ag-chem facility at <br /> 1905 North Broadway Avenue, Stockton. Sierra-Pacific Groundwater Consultants, Inc. (Sierra- <br /> Pacific) has been contracted by Unocal to conduct the Broadway Avenue ground-water <br /> investigation. We have been involved with the project since about May of 1994. <br /> The ag-chem facility, currently operated by Crop Production Services (CPS), is located a few <br /> hundred feet north of your property. Relatively low concentrations of fertilizer and pesticides have <br /> been detected in wells at the site, and ground water may be flowing towards your property. We <br /> are primarily concerned with parts-per-billion concentrations of the nematocide, 1,2- <br /> dichloropropane (1,2-DCP). <br /> On behalf of Unocal, Sierra-Pacific proposes to collect ground water samples from a monitoring <br /> well located on your property to determine if ag-chemicals exist in the ground water. We also <br /> propose to collect ground water samples which the San Joaquin County Environmental Health . <br /> Department (SJCEHD) has asked you to analyze for various petroleum hydrocarbon compounds. <br /> Sierra-Pacific proposes to purge and sample your monitoring well using a Grundfosso, 2-inch- <br /> diameter, submersible pump. The Unocal water samples would be analyzed for Total Kjeldahl <br /> Nitrogen (TKN) by EPA Method 351.4, nitrates (NO3) by EPA Method 300, and halogenated <br /> hydrocarbon compounds by EPA Method 601. <br /> 46 <br /> VMt p ;3 ��:.; iforniaX9S7�62 <br /> a ve Suit ! E3 Dorado}hits,Cal <br /> 1 <br />