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I Former Canteen Facility April 14, 2004 <br /> Quarterly Groundwater Monitormg Report Page 3 <br /> GROUNDWATER CONDITIONS <br /> The following summarizes the local groundwater gradient and the groundwater analytical results <br /> Groundwater Gradient <br /> Interpretation of the monitor well gauging data indicates that there is a southwesterly <br /> hydraulic gradient across the Site of approximately 0 002 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 /> I located approximately 1000 feet to the northeast The historical groundwater elevations <br /> are summarized on Table 1 <br /> IGroundwater Analytical Results <br /> Groundwater analytical results are compared to the California Department of Health <br /> I . 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 /> I • Benzene was detected in thesam roundwater les from monitor wells MW-3, <br /> g p <br /> I MW-3D, MW-11, MW-13, and MW-13A at concentrations of 2 8, 2 9, 0 55, <br /> 26,000, and 0 96 µg/l, respectively The CAMCL for benzene is 1 0 pg/l, <br /> exceeded in MW-3, MW-3D, and MW-13 <br /> l . Toluene was detected in monitor wells MW-13 and MW-13A at concentrations of <br /> 44,000 and 3 6 µg/l, respectively The CAMCL for toluene is 150 pg/1 <br /> • Ethylbenzene was detected in monitor wells MW-3, MW-31), MW-13, and MW- <br /> 13A at concentrations of 0 45, 6, 3,200, and 0 74 ug/l, respectively The CAMCL <br /> for ethylbenzene is 700 µg11 <br /> • Total xylenes were detected in monitor wells MW-3, MW-31), MW-13, and MW- <br /> 13A at concentrations of 0 28, 0 41, 26,100, and 4 µg/l, respectively The <br /> CAMCL for xylenes is 1,750 µg/L <br /> I . TPH(g) was detected in monitor wells MW-3, MW-3A, MW-3D, MW-11, MW- <br /> 13, MW-13A, and MW-13B at concentrations ranging from 60 to 270,000 µg/l <br /> I <br />