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SECOR www secor com <br /> NTERNATIONAL <br /> S ECOR INCORPORATED 3437 Empresa Dnve Suite <br /> San Luis Obispo GA 93401 <br /> 805-548-0455 TEL <br /> n 805-546-05$3 FAx <br /> March 24, 2006 <br /> RD ������ u` <br /> MAR 17 2000 <br /> Mr Jeffrey Wong ENVIRONMENT HEALTH <br /> San Joaquin County Environmental Health Department PERMIT/SERVICES <br /> ENT HEAL <br /> 304 East Weber Avenue, Third Floor <br /> Stockton, CA 95202 <br /> RE First Quarter 2006 Groundwater Monitoring Report <br /> Chevron Branded Service Station 9-9840 <br /> 4344 Waterloo Road <br /> Stockton, California <br /> SECOR Project No MTCH 99840 06 X164 <br /> Dear Mr Wong <br /> SECOR International Incorporated (SECOR), on behalf of Chevron Environmental Management <br /> Company (CEMC), has provided this report to summarize the first quarter 2006 (102006) groundwater <br /> monitoring event at the above-referenced site <br /> COMPLETED ACTIVITIES — FIRST QUARTER 2006 <br /> �k ■ <br /> Conducted quarterly groundwater monitoring and sampling, and, <br /> • Prepared and submitted quarterly groundwater monitoring report <br /> PLANNED ACTIVITIES — SECOND QUARTER 2006 <br /> • Conduct quarterly groundwater monitoring and sampling, and, <br /> • Prepare and submit quarterly groundwater monitoring report <br /> DISCUSSION <br /> On January 27, 2006, Gettler-Ryan Incorporated (G-R) performed 1Q2006 groundwater monitoring and <br /> sampling G-R's groundwater monitoring report is included in Attachment A Groundwater elevations <br /> across the site ranged from 28 64 to 30 94 feet below mean sea level (msl) Groundwater elevation <br /> across the site increased an average of 9 04 feet from the previous sampling event Groundwater flow <br /> was northeasterly at an approximate gradient of 0 006 to 0 02 ft/ft Seven wells were sampled during his <br /> event A summary of laboratory analytical data including total petroleum hydrocarbons as gasoline <br /> (TPHg), benzene, and methyl tertiary butyl ether(MTBE) is presented below <br /> • <br /> 1 Q06MR 99840 SECOR International incorporated <br />