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f . <br /> V ( -) <br /> F..I <br /> BEST CALIFORNIA GAS, LTD <br /> December 9, 2009 0-101180 <br /> 'F <br /> Mr. Michael J. Infurna Jr. <br /> Site Cade: 1299 <br /> Senior REHS RO is 0552 <br /> County of San Joaquin <br /> Site Mitigation Unit IV/LOP I <br /> 600 East Main Street <br /> Stockton, CA 95202 <br /> ;K <br /> RE: Former Best Stations #171 <br /> (ARCO#9600) <br /> 1250 North Wilson Way <br /> Stockton, CA 95205 <br /> No-Purge Groundwater Sampling Test Rest lt��. <br /> r <br /> Dear Mr. Infiuna: <br /> R <br /> On March 26, 2009, the San Joaquin County Environmental Health Department approved <br /> i Best's March 17, 2009 request to conduct a no-purge test of groundwater monitoring wells <br /> TB-7 and EW-5S at former Best California Gas,Ltd(Best)Station#171 Iocated at 1250 North <br /> Wilson Way, Stockton, CA(Figure 1). The no-purge test was completed on May 20, 2009 <br /> and involved collecting groundwater samples from monitoring`wells .;-7 and EW-5S without <br /> purging the wells, then purging each of the wells and collecting another sample from each <br /> well. Analytical results of the no-purge test are presented in Table 11!and the laboratory report <br /> is included in Appendix A. The sample results indicated that the no-purge samples had <br /> generally higher concentrations of hydrocarbons than the purged samples. Based upon the <br /> results of the no-purge test, Best has concluded that no-puge sampling pling method will not <br /> provide groundwater data representative of the site conditions, and therefore, Best will not <br /> continue this sampling method but will continue with the purge method sampling at this site. <br /> 'i <br /> 13116 Imperial Highway,Santa Fe Springs,CA 90670•Ph:(562)821-3581 Fax: (562)821-3562 <br /> 5 <br />