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t4 t <br /> Second Quarter 2005 Groundwater Monitoring Report <br /> Eckert Cold Storage Manteca,Califomia <br /> August 12,2005 <br /> Page 2 <br /> Summary of July 8, 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 July 8,2005 <br /> water level <br /> Site Hydrology <br /> Average depth to groundwater below 1856 Increase(+)/decrease(—)in average depth to +204 <br /> monitoring well measuring points oundwater since last monitoring event <br /> Approximate groundwater flow direction West <br /> Groundwater Contamination <br /> Wells containing free product 0 Wells with petroleum hydrocarbon odors noted I <br /> Nature of contamination Gasoline Range in concentrations <br /> Constituents Benzene(µg/L) <0 5—430 <br /> Toluene((µg/L) <0 5—7 3 <br /> Ethyl Benzene(1ig/L) <0 5—120 <br /> Xylenes(µg/L) <1 0-380 <br /> TPH-G(mg/L) <0 05--5 0 <br /> MTBE(µg/L) 59- 14 <br /> 1,2-DCA(gg/L) 4 8--<5 0 <br /> TBA(pg/L) <5 0-61 <br /> FIELD OBSERVATIONS <br /> On July 8, 2005, a Condor representative made field observations at two of the eight Site monitoring <br /> wells (MW-5 and MW-8) Field observations included sample odor, appearance (color, clarity, and <br /> presence of petroleum product sheen or phase in samples), and water quality field parameters No sheen <br /> . was noted in the inspection sample collected from either well A moderate hydrocarbon odor was noted in <br /> the inspection sample collected from monitoring well MW-8 <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 July 8, 2005 was approximately 2 04 feet lower than the previous <br /> sampling event conducted on March 9, 2005 The three-point solution for the site groundwater gradient <br /> on July 8, 2005, utilizing monitoring wells MW-3, MW-4, and MW-6, is shown in Figure 3, Attachment <br /> A, and indicates that the groundwater gradient was approximately 0 0011 ft/ft toward the west <br /> Groundwater elevation data for the July 8, 2005 monitoring event are presented in Table 1, on the next <br /> page, and are also shown in Figure 3, Attachment A <br /> • <br /> 1 <br /> �`a CONDOR <br />