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LATE OF CALIFORNIA-Environmental Protection Agency PETE WILSON Governor <br /> MCALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD <br /> CENTRAL VALLEY REGION <br /> t443 Routier Road Suite A <br /> acramento CA 95827-3096 <br /> E (916)255-3000 <br /> (916} 255-3015 ' <br />' 17 March 1994 <br />' Mr Robert Vasquez <br /> The Southland Corporation <br /> 5820 Stoneridge Mall Rd , Ste 310 <br /> Pleasanton, CA 94588 <br /> RESULTS OF WELL SAMPLING, 7-ELEVEN, 9110 THORNTON ROAD, STOCKTON, SAN <br /> JOA Q UIN COUNTY <br />' Enclosed are copies of the analytical results of the samples collected by Board staff on 24 January <br /> 1994 Analysis by EPA Methods 601 and 602 were performed in-house at our laboratory The <br /> results for the sample from monitoring well MW 1 showed traces of chloroform and levels of BTEX <br />' in the low ppb range Gasoline constituents were detected in the sample from MW1, therefore, this <br /> sample was further tested for TPHo, and lead by FGL Environmental Laboratory No lead was <br /> detected, however, 110 ppb TPH as gasoline was detected in the sample The results of the sample <br /> from the domestic well at 9156 Connie Ave showed traces of carbon tetrachloride and chloroform <br /> The results of the sample from the domestic well at 9172 Thornton Rd showed a trace of carbon <br /> tetrachloride The other sampled wells, MW9, MW 11, and MW 14, did not contain detectable levels <br /> of contamination Note that MW I 1 is located on the property at 9135 Connie Ave Table 1 shows <br /> the contanunants and where they were detected <br /> Once we have received the results from the samples collected by your consultants, we will consult <br /> with San Joaquin County staff and review the status of your site If you have any questions, call me <br />' at (916) 255-3133 <br /> 1 <br /> EL ETH A THAYER <br /> Associate Engineer <br /> cc Ms Mary Meays, San Joaquin County Environmental Health Division, Stockton <br /> Ms Sailaja Yelamanchilx, Groundwater Technology, Inc , West Sacramento <br /> ' REC&E CED <br />