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Former Canteen Facility October 15,2003 Quarterly Groundwater Monitoring Report Page 3 GROUNDWATER CONDITIONS The following summarizes the local groundwater gradient and the groundwater analytical results Groundwater Gradient Interpretation of the monitor well gauging data indicates that there is a southwesterly hydraulic gradient across the Site of approximately 0 002 feet/foot Figure 2 illustrates the groundwater contours and gradient for this gauging event The gradient appears to be consistent with past gauging events The change in water levels is a result of cyclical fluctuations in the weather and the proximity of the site to the Stockton Diverting Canal, located approximately 1000 feet to the northeast The historical groundwater elevations are summarized on Table 1 Groundwater Anal3qical Results Groundwater analytical results are compared to the California Department of Health Services Drinking Water Standard Maximum Contaminant Levels (CAMCL) Analysis of the groundwater samples obtained from the six Site monitor wells indicated the following • Benzene was detected in the groundwater sample from monitor well MW-3 at a concentration of 1 µg/l The groundwater sample taken from monitor well MW-3 is equal to the CAMCL for benzene of 10 µg/1 • Toluene was detected in monitor well MW-3 at a concentration of 13 µg/l The CAMCL for toluene is 150 µg/l • Ethylbenzene was not detected in any monitor wells sampled The CAMCL for ethylbenzene is 700 µg11 • Total xylenes were not detected in any monitor wells sampled The CAMCL for xylenes is 1,750 µg/l, • TPH(g) was detected in monitor wells MW-3 and MW-ll at concentrations of 56 and 59 µg/1, respectively • O °?cio