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BEST CALIFORNIA GAS, LTD <br /> March 17, 2009 0-95079 <br /> Mr. Michael J. Infurna Jr. mcsvEDD <br /> Senior REHS <br /> County of San Joaquin MAR 2 0 2009 <br /> Site Mitigation Unit IV/LOP <br /> 600 East Main Street ENVIRONMEN f HEALTH <br /> E L H <br /> Stockton, CA 95202 <br /> Re: Former Best California Gas, Ltd Station #171 SJCSMU Case #: 1299 <br /> ARCO Products Co. Station #9600 CVRWQCB #: 390187 <br /> 1250 North Wilson Way <br /> Stockton, CA 95205 <br /> Former Best California Gas, Ltd Station #172 SJCSMU Case#: 1227 <br /> Circle K Station #2705449 CVRWQCB #: 390652 <br /> 7647 Pacific Avenue <br /> Stockton, CA 95207 <br /> Subject: Request to Conduct Non-Purge Groundwater Sampling <br /> Dear Mr. Infurna: <br /> This letter is written as a request to conduct groundwater sampling using a non-purge method for monitoring <br /> wells at the above-referenced sites under your oversight at the San Joaquin County Site Mitigation Unit <br /> (SJCSMU). Figures showing the well locations at each site are enclosed. The purpose of this request is to <br /> reduce costs and energy expenditure,so that more resources are available for higher priority tasks such as site <br /> remediation. By implementing these proposed non-purge sampling measures,a significant cost savings can be <br /> realized for these sites. The following table lists the sites that you oversee, indicating the estimated savings <br /> for each: <br /> SS# Case# Ownership Address Total Volume Wells Estimated <br /> Wells Purged Selected Savings <br /> Water for Initial ($/year) <br /> (gals./yr.) Method <br /> Testing <br /> 171 CVRWQCB Best California 1250 North Wilson 10 1,400 TB-7 $5,070 <br /> # 390187 Gas, Ltd Way, Stockton, CA EW-5S <br /> 95205 <br /> 13116 Imperial Highway, Santa Fe Springs,CA 90670-0138 •(562)921-3581 <br />