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I <br /> I <br /> Former Canteen Facility April 4,2002 <br /> Quarterly Groundwater Monitoring Report _ Page 3 <br /> Groundwater Gradient <br /> I Interpretation of the monitor well gauging data indicates that there is a south - <br /> southwesterly hydraulic gradient across the Site of approximately 0 001 feet/foot Figure <br /> 2 illustrates the groundwater contours and gradient for this gauging event The gradient <br /> appears to be consistent with past gauging events The change in water levels is a result <br /> of cyclical fluctuations in the weather and the proximity of the site to the Stockton <br /> Diverting Canal, located approximately 1000 feet to the northeast The historical <br /> Igroundwater elevations 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 seventeen groundwater samples obtained from the Site monitor wells indicated the <br /> following <br /> I * Benzene was detected in groundwater samples from monitor wells MW-3, MW-5 <br /> and MW-13 at concentrations ranging from 0 86 to 24,000 µg/l Groundwater <br /> samples taken from monitor wells MW-3 and MW-13 exceeded the CAMCL for <br /> benzene of 10 µg/1 <br /> • Toluene was detected in monitor wells MW-3, MW-13, and MW-13A at <br /> concentrations ranging from 1 1 to 38,000 gg/l The CAMCL for toluene is 150 <br /> µg/1, exceeded only in MW-13 <br /> * Ethylbenzene was detected in monitor wells MW-3, MW-3A, MW-3D, MW-13, <br />' and MW-13A at concentrations ranging from 052 to 4,200 µg/l The CAMCL <br /> for ethylbenzene is 700 µg/l, exceeded only in MW-13 <br /> * Total xylenes were detected in monitor wells MW-3, MW-3A, MW-5, MW-13, <br /> and MW-13A at concentrations ranging from 0 67 to 23,000 µg/1 The CAMCL <br /> for xylenes is 1,750 µg/L, exceeded only in MW-13 <br /> * TPH(g) was detected in monitor wells MW-3, MW-3A, and MW-13 at <br /> concentrations ranging from 110 to 170,000 µg/1 <br /> O <br /> SLICES�� <br />