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Sierra-Pacific Groundwater Consultants, Inc. <br /> HYDROGEOLOGISTS&GEOLOGISTS <br /> y y <br /> RECEIVED <br /> AUG 12 1994 <br /> ENVIRONMENTAL HEALTH <br /> PERMIT/SERVICES <br /> August 9, 1994 <br /> Mr. Joseph Vargas <br /> 1656 Sutro Avenue <br /> Stockton, CA 95205 <br /> Subject. East Stockton Ground-Water Investigation, New Monitoring Wells Required on Property " <br /> Located at 1656 N. Sutro, Sierra-Pacific Project No. 94-055.3 <br /> Dear Mr. Vargas: <br /> The State of California recently asked Unocal Corporation to define the extent of agricultural <br /> chemical concentrations known to be present in shallow ground water at an agricultural-chemical <br /> facility at 1905 North Broadway Avenue, Stockton. Sierra-Pacific Groundwater Consultants, Inc. <br /> (Sierra-Pacific) has been contracted by Unocal to conduct the Broadway Avenue ground-water <br /> investigation. <br /> The ag-chem facility, operated by Crop Production Services (CPS), is located a few hundred feet <br /> east of your property. Relatively low concentrations of fertilizer and pesticides have been detected <br /> in wells at the site, and ground water appears to flow southwest towards your property. On behalf <br /> of Unocal, Sierra-Pacific would like to install a shallow monitoring well on your property, take <br /> water samples, and determine if ag-chemicals exist in the water. <br /> Depending on site access, a well can usually be installed in a single day, and developed within one <br /> week. Wells can be installed at surface-level, or with an 18-inch steel standpipe. Monitoring wells <br /> are often sampled every three (3) months using a 2-inch-diameter, submersible, electronic pump. <br /> You would be notified ahead of time to there would be no unannounced visits by our field <br /> personnel. Water samples would be analyzed for ammonium, nitrates, and halocarbon compounds. <br /> Several large industrial facilities and small shops operating in the east Stockton region may be <br /> contributing to widespread ground-water pollution. It is difficult to isolate individual industrial and <br /> domestic sources of ground-water pollution. However, the State, San Joaquin County, and Unocal <br /> must try. We need additional scientific information, especially ground-water data. <br /> Would you allow Sierra-Pacific to install and sample a 2-inch-diameter monitoring well on your <br /> property? <br /> (916)933.1468 <br /> 4911 Windplay Drive,Suite 4 EI Dorado Hills,California 95762 (916)9333197 FAX <br />