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CONDOR EARTH TECHNOLOGIES INC <br /> %44V <br /> 188 Frank West Circle Suite I <br /> Stockton CA 95206 <br /> 'o Phone 209.234.0518 <br /> FAX 209.234.0538 <br /> CONDOR www.condorearth.com <br /> THIRD QUARTER GROUNDWATER MONITO MRT <br /> SEPTEMBER 2004YED <br /> Condor Project No. 3471E <br /> NO v 0 5 2004 <br /> October 22, 2004 <br /> ENVIRONMENT HEALTH <br /> PERMfTISERVICES <br /> Site Address: Eckert Cold Storage Co. <br /> 757 Moffat BIvd. <br /> Manteca, California <br /> Client: Mr. Pete Thompson <br /> 19901 McHenry 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 third quarter 2004 groundwater monitoring event conducted on <br /> September 7, 2004 at the above-referenced site. Monitoring wells MW-4 and MW-8 were sampled as part <br /> of this quarterly monitoring event. Maps indicating the site location, monitoring well locations and well- <br /> collar elevations (site map), and groundwater gradient are included as Figures 1, 2, and 3, Attachment A, <br /> respectively. Also attached are site background information, historic groundwater monitoring data, field <br /> forms, and laboratory analytical reports for the current monitoring event. This report has been submitted <br /> to the San Joaquin County Environmental Health Department (SJCEHD) and the California Regional <br /> Water Quality Control Board (CRWQCB), as referenced above. <br /> Summary of September 7, 2004 Quarterly Groundwater Monitoring Event <br /> Field Activit <br /> Number of monitoring wells 8 Number of monitoring wells sampled 2 <br /> Number of monitoring wells measured for 8 Date(s)monitored 09/07/04 <br /> water level <br /> Site Hydrology <br /> Average depth to groundwater below 23.09 Average increase(+)/decrease(—)in depths to + 1.28 feet <br /> monitoring well measuring points groundwater since last sampling (deeper) <br /> A roximate roundwater flow direction' North <br /> Groundwater Contamination <br /> Wells containing free product None Wells with petroleum hydrocarbon odors 1 <br /> noted <br /> Nature of contamination: Gasoline Range in concentrations: <br /> Constituents Benzene(µg/L) <0.5— 130 <br /> Toluene((µg/L.) <0.5— 1.1 <br /> Ethyl Benzene(pg/L) <0.5--4.6 <br /> Xylenes(pg/L) <1.0— 1.0 <br /> TPH-G(mg1L) <0.05— 1.0 <br /> MTBE(gg/L) 7.1 —18.0 <br /> 1,2-DCA(µg/L) 3.0—1 1.0 <br /> TBA( L) <5.0—53.0 <br />