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SECOR www secor conn <br /> -INTERNATIONAL <br /> 3437 Empresa Drive Suite A <br /> E C ® R nC INCORPORATED San Luis Obispo CA 93401 <br /> t 805-546-0455 TEL <br /> • `; 805-546-0583 FAx <br /> October 5, 2004 a <br /> Mr Jeffery Wong <br /> San Joaquin County Environmental Health Department <br /> 304 East Weber Avenue, Third Floor <br /> Stockton, California 95202 <br /> Subject Third Quarter 2004 Groundwater Monitoring Report and Modification of <br /> Monitoring Frequency Request <br /> Chevron Service Station No 9-9840 <br /> 4344 Waterloo Road, Stockton, California <br /> Dear Mr Wong <br /> SECOR International Incorporated (SECOR), on behalf of Chevron Environmental Management <br /> Company (Chevron), is pleased to submit the attached Third Quarter 2004 groundwater <br /> • monitoring report as required by the San Joaquin County Environmental Health Department <br /> (SJCEHD) and to request a modification of monitoring frequency <br /> This report covers the routine monitoring of seven groundwater monitoring wells located at 4344 <br /> Waterloo Road, Stockton, California Gettler-Ryan Inc (G-R) conducted the fallowing field <br /> activities on July 15, 2004 site inspection, well gauging, well purging, purge water containment, <br /> sample collection and sample handling Samples were then shipped under chain-of-custody to <br /> Lancaster Laboratories located in Lancaster, Pennsylvania for analysis G-R also prepared the <br /> attached Groundwater Monitoring and Sampling Report <br /> Current and historical groundwater analytical data indicate that total petroleum hydrocarbon <br /> gasoline range (THPg) and benzene, toluene, ethylbenzene and total xylenes (BTEX) <br /> concentrations in monitoring wells MW-4, MW-5, MW-6 and MW-7 have been remained below <br /> laboratory reporting limits Groundwater analytical data from the wells also have indicated that <br /> methyl-tert-butyl-ether (MTBE) concentrations have been fluctuating within the range of <br /> historical results Monitoring wells MW-1, MW-2 and MW-3 contained insufficient water to be <br /> sampled this quarter Based on the groundwater data SECOR believes that the frequency of <br /> groundwater sampling and monitoring of this site should be reduced to an annual event in <br /> preparation for site closure SECOR proposes to implement this modification of the sampling <br /> and monitoring frequency immediately, with the next sampling event to be conducted at this site <br /> during the second quarter of 2005 <br />