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t� 7 <br /> `Chtrd Quarter 2005 Groundwater Monitoring Report <br /> Eckert Cold Storage Manteca,Califomia <br /> October 26,2005 <br /> Page 2 <br /> • Summary of September 22, 2005 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 monitored September <br /> water level 22,2005 <br /> Site Hydrology <br /> Average depth to groundwater below Is 90 ft Increase(+)/decrease(—)in average depth to +0 34 ft <br /> monitoring well measuring points groundwater since last monitoring event <br /> Aperoximate jEaundwater flow direction Northwest <br /> Groundwater Contamination <br /> Wells containing free product 0 Wells with petroleum hydrocarbon odors noted 2 <br /> Nature of contamination Gasoline Range to concentrations <br /> Constituents Benzene(pg/L) <0 5—31 <br /> Ethyl Benzene(µg/L) <0 5—3 1 <br /> TPH-G(mg/L) <0 05—0 74 <br /> MTBE(ug/L) 45-92 <br /> 1,2-DCA(lig/L) 3 5-64 <br /> TBA(1ig/L) <5 0-45 <br /> FIELD OBSERVATIONS <br /> On September 22, 2005, a Condor representative made field observations at two of the eight Site <br /> monitoring wells (MW-5 and MW-8) Field observations included sample odor, appearance (color, <br /> clarity, and presence of petroleum product sheen or phase in samples), and water quality field parameters <br /> No sheen was noted in the inspection sample collected from either well, but a moderate hydrocarbon odor <br /> • was noted in the inspection samples collected from both <br /> GROUNDWATER ELEVATIONS <br /> The eight Site monitoring wells were measured for depth to water during this quarterly monitoring event <br /> The average groundwater elevation on September 22, 2005 was approximately 0 34 foot lower than the <br /> previous sampling event conducted on July S, 2005 The three-point solution for the site groundwater <br /> gradient on September 22, 2005, utilizing monitoring wells MW-3, MW-4, and MW-6, is shown in <br /> Figure 3, Attachment A, and indicates that the groundwater gradient was approximately 0 0014 ft/ft <br /> toward the northwest Groundwater elevation data for the September 22, 2005 monitoring event are <br /> presented in Table 1, on the next page, and are also shown in Figure 3, Attachment A <br /> N&W_ <br /> CONDOR <br />