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rr - <br /> r� <br /> CONDOR EARTH TECHNOLOGIES INC <br /> 188 Frank West Circle Suite <br /> Stockton CA 95206 <br /> MAY 2 0 2003 Phone 209.234.0518 <br /> FAX 209.234.0538 <br /> CONDOR ENVIROI�NiBT HEALTH www.condorearth.com <br /> PERMIT/SEKVICES <br /> FIRST QUARTER GROUNDWATER MONITORING REPORT <br /> MARCH 2003 <br /> Condor Project No. 3471D <br /> April 23, 2003 <br /> Site Address: Eckert Cold Storage Co. <br /> 757 Moffat Blvd. <br /> Manteca, California <br /> Client: Mr. Pete Thompson <br /> 19901 Mc 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 first quarter 2003 groundwater monitoring event conducted on March <br /> 28, 2003 at the above-referenced site. Maps indicating the site location, monitor well locations and well- <br /> collar elevations (site map), groundwater elevation contours, and groundwater gradient are included as <br /> Figures 1, 2, 3, and 4, Attachment A, respectively. Also attached are site background information, <br /> historical groundwater monitoring data, field forms, and laboratory analytical reports for the current <br /> monitoring event. This report has been submitted to the San'Joaquin County Environmental Health <br /> Department (SJCEHD) and the California Regional Water Quality Control Board (CRWQCB), as <br /> referenced above. <br /> Summary of March 28,2003 Quarterly Groundwater Monitoring Event <br /> Field Activity <br /> Number of monitor wells 8 Number of monitor wells sampled 2 <br /> Number of domestic wells 1 Number of domestic wells sam led 1 <br /> Date monitored and sM !ed 3/28/03 <br /> Site Hydrology <br /> Average depth to groundwater below 18.16 ft bgs Average increase(+)/decrease"in depths to -0.57 feet <br /> monitor well measuringpoints groundwater since last sampling shallower <br /> -Approximate ffoundwater flow direction Northwest <br /> Groundwater Contamination <br /> Wells containing free product None Wells with petroleum hydrocarbon odors 1 <br /> noted <br /> Nature of contamination: Benzene, Range in concentrations: <br /> Ethyl Benzene, Benzene(µg/L) <0.5—50 <br /> Total Xylenes, Ethyl Benzene(ggf L) <0.5— 15 <br /> TPH-G. Total Xylenes(µg/L) <1.0-5.0 <br /> MTBE, TPH-G(mg/L) <0.05—0.97 <br /> 1,2-DCA MTBE(µg/L) <0.5—9.0 <br /> TBA 1,2-DCA(µg/L) <0.5—11 <br /> Tert butanol µ ) <0.5—35 <br />