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San Joaquin County Public Health Services requested Ultramar Inc. to schedule <br /> a sampling event with PHS/EHD staff by March 16, 1993. <br /> Aegis Environmental , Inc. of Roseville, California has. set up a day and time <br /> for San Joaquin County-Public Heath Services to observe the next quarterly <br /> monitoring event and they will be providing you 24-hours advance notice prior <br /> to sampling. <br /> San Joaquin County Public Health Services states that "PHS/EHD was informed <br /> that a soil sample collected at 21 feet below grade surface on October 7, 1992 <br /> evidenced .005 ppm Ethyl benzene and .04 ppm Xylene. These results are not <br /> included in the November 10, 1992 report. Apparently the soil samples were <br /> analyzed a second time and these results are included in the November 1992 <br /> report." <br /> The sample to which you refer at 21 feet was in soil boring nine. This sample <br /> was analyzed by EPA, method 8020 (detection limit of .005 ppm) and the initial <br /> results were .005 ppm ethylbenzene and .04 ppm xylene. Because this was the <br /> only sample to contain detectable hydrocarbons it was decided to analyze this <br /> sample utilizing GC/MS methodology by EPA method 8240 (detection limit of .005 <br /> ppm for both ethylbenzene and xylene), with all constituents being non detect. <br /> The EPA method 8020 was run again after the EPA 8240 and the results were also <br /> non detect. The second analysis by EPA 8020 and the EPA 8240 results were both <br /> included in the final report. <br /> Please do not hesitate to call if you have any questions about this project at <br /> (209) 583-5571. <br /> Sincerely, <br /> ULTRAMAR INC. <br /> Kenneth R. Earnest <br /> Environmental Specialist I <br /> Marketing Environmental Department <br /> Enclosure: MW-4 soil boring stockpile sample, with transport bill <br /> Confirmation soil boring sample, with transport bill <br /> cc: Mr. Gordon Boggs, Central Valley Region, RWQCB <br />