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Former Canteen Facility October 15, 2004 <br /> . Quarterly Groundwater Monitoring Report Page 3 <br /> GROUNDWATER CONDITIONS <br /> IThe following summarizes the local groundwater gradient and the groundwater analytical results <br /> Groundwater Gradient <br /> IInterpretation of the monitor well gauging data indicates that there is a southwesterly <br /> hydraulic gradient across the Site of approximately 0 001 feet/foot Figure 2 illustrates <br /> I the groundwater contours and gradient for this gauging event The gradient appears to be <br /> consistent with past gauging events The change in water levels is a result of cyclical <br /> fluctuations in the weather and the proximity of the site to the Stockton Diverting Canal, <br /> Ilocated approximately 1000 feet to the northeast The historical groundwater elevations <br /> are summarized on Table 1 <br /> Groundwater Analytical Results <br /> Groundwater analytical results are compared to the California Department of Health <br />' Services Drinking Water Standard Maximum Contaminant Levels (CAMCL) Analysis <br /> of the groundwater samples obtained from the six Site monitor wells indicated the <br />' . following <br /> Benzene was detected in the groundwater samples from monitor wells MW-3D <br />' and MW-13A at concentrations of 2 3 and 15 µg/l, respectively The CAMCL for <br /> benzene is 10 µg/1, exceeded in MW-3D and MW-13A <br />' • Toluene was detected in monitor well MW-13A at a concentration of 19 µg11 <br /> The CAMCL for toluene is 150 µg/1 <br />' • Ethylbenzene was detected in monitor wells MW-31) and MW-13A at <br /> concentrations of 2 6 and 3 9 µg/l, respectively The CAMCL for ethylbenzene is <br />' 700 µg/l <br /> • Total xylenes were detected in monitor well MW-13A at a concentration of 33 <br />' µg/1 The CAMCL for total xylenes is 1,750 µg/L <br /> • TPH(g) was detected in monitor wells MW-3, MW-3A, MW-3D, MW-11, MW- <br /> 13A, and MW-13B at concentrations ranging from 67 to 290 µg/l <br /> • MTBE was detected in monitor wells MW-3, MW-3A, MW-3D, and MW-11 at <br />' concentrations of 100, 160, 7 5, and 9 2 µg/l, respectively The CAMCL for MTBE <br /> is 13 tig/l, exceeded in MW-3 and MW-3A <br />