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S _ <br /> Sheen was not observed in any of the monitoring wells during the February 3, 2011 sampling <br /> event. The depth to groundwater measurement from well MW-1 appeared anomalous, and was <br /> not used for groundwater contouring as it would have produced an unrealistic flow pattern. <br /> Table 1. Monitoring Well Groundwater Data <br /> Monitoring Date Depth to Groundwater Top of Casing Groundwater Comments <br /> Well Number from Top of Casing(ft) Elevation(ft.)* Elevation(ft) <br /> MW-1 2/12/09 14.23 57.77 43.54 Sheen on water <br /> 7/1/09 14.91 42.86 None <br /> 9/9/10 1 15.28 42.49 None <br /> 2/3111 14.95 42.82 Anomalous measurment. <br /> Not used for groundwater <br /> elevation contouring, <br /> MW-2 2112109 14.50 57.98 43.48 Sheen on water <br /> 7/1/09 15.21 42.77 None <br /> 9/9/lo 15.70 42.28 None <br /> 213/11 14.72 43.26 None <br /> MW-3 2/12/09 14.31 57.31 43.00 None <br /> 7/l/09 15.04 42.27 None <br /> 9/9/10 15.31 42.00 None <br /> 213111 14.49 42.82 None <br /> MW4 2112109 14.56 5848 43.92 None <br /> 7/l/09 15.21 43.27 Oil spill on surface entered <br /> well box,did not appear to <br /> enter well <br /> 9/9/10 15.55 42.93 None <br /> 2/3/11 14.84 43.64 None <br /> *-Monitoring well top of casing elevations surveyed to NGVD by City of Tracy_ <br /> 5.0 Summary <br /> Wright performed quarterly groundwater monitoring, sampling, and chemical analysis for the <br /> Boyd Service Center on February 3, 2011. During this sampling round, groundwater appeared to <br /> flow to the north at a gradient of about 0.003. Water level data collected from MW-1 appeared <br /> to be anomalous and was not used in plotting the groundwater elevations contours for this <br /> quarter. TPHD was detected in wells MW-1, MW-2 and MW-3 and MW-4, and TPHG was <br /> detected in well MW-1. BTX, MTBE, Ethanol and Methanol were not detected in any well this <br /> quarter. Ethylbenzene was detected in MW-1 at 0.54 ug/l. Low concentrations of VOCs, <br /> including Dichlorfluoromethane, Trichlorofluoromethane, and Chloroform, were reported. <br /> Wright will schedule the next quarterly sampling event with the City. <br /> Quarterly reports of the groundwater monitoring program will be prepared for submittal to the <br /> City and EHD and RWQCB Region 5 in both hard copy, and electronic format for submittal to <br /> Geotracker_ <br /> P•u.n Z <br />