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CONDOR EARTH TECHNOLOGIES INC <br /> 188 Frank West Circle Suite I <br /> Stockton CA 95206 <br /> Phone 209.234.0518 <br /> CONDOR209.234.0538 <br /> r � <br /> ANNUAL GROUNDWATER MONITORING K:k:YURT <br /> FEB 0 5 2004 <br /> DECEMBER 2003 ENVIRONMENT HEALTH <br /> Condor Project No. 3471D PERMIT/SERVICES <br /> January 13, 2004 <br /> Site Address: Eckert Cold Storage Co. <br /> 757 Moffat Blvd. <br /> Manteca, California <br /> Client: Mr. Pete Thompson <br /> 19901 Me Henry Avenue <br /> Escalon, California <br /> Primary Agency: Harlin Knoll, San Joaquin County Environmental Health Department(SJCEHD) <br /> Copy to: James Barton, California Regional Water Quality Control Board, Central Valley <br /> Region (CRWQCB) <br /> This is a report of the results of the annual groundwater monitoring event conducted during the fourth <br /> quarter 2003 on December 12, 2003 at the above-referenced site. Quarterly monitored wells MW-4 and <br /> MW-8 and annually monitored wells MW-5 and MW-7 were sampled as part of this annual monitoring <br /> event. Maps indicating the site location, monitor well locations and well-collar elevations (site map), <br /> groundwater elevation contours, and groundwater gradient are included as Figures 1, 2, 3, and 4, <br /> Attachment A, respectively. Also attached are site background information, historical groundwater <br /> monitoring data, field forms, and laboratory analytical reports for the current monitoring event. This <br /> report has been submitted to the San Joaquin County Environmental Health Department (SJCEHD) and <br /> the California Regional Water Quality Control Board(CRWQCB), as referenced above. <br /> Summary of December 12, 2003 Annual Groundwater Monitoring Event <br /> Field Activit <br /> Number of monitor wells 8 Number of monitor wells sampled 4 <br /> Number of domestic wells 1 Number of domestic wells sampled 1 <br /> Date monitored and sampled 12/12/03 <br /> Site H drolo <br /> Average depth to groundwater below 20.91 ft Average increase(+)/decrease(—)in depths to +0.10 feet <br /> monitor well measuring points groundwater since last sampling (deeper) <br /> A roximate groundwater flow direction Northwest <br /> Groundwater Contamination <br /> Wells containing free product None Wells with petroleum hydrocarbon odors 0 <br /> noted <br /> Nature of contamination: Gasoline Range in concentrations: <br /> Constituents Benzene(µg/L) <0.5—8.9 <br /> Ethyl Benzene(4g/L) <0.5—6.9 <br /> TPH-G(mg/L) <0.05—0.43 <br /> MTBE(µg/L) <0.5—7.0 <br /> . 1,2-DCA(µg/L) <0.5— 15 <br /> TBA L <5.0— 14 <br />