Laserfiche WebLink
• Former Canteen Facility Apnl 14,2005 <br /> Q-garterly Groundwater Mo storm Re rt Pae 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 0 004 feet/foot Figure 2 illustrates <br /> 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 /> located approximately 1000 feet to the northeast The historical groundwater elevations <br /> are summarized on Table 1 <br /> Groundwater Anal3qical 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 Site monitor wells indicated the following <br /> • • Benzene was detected in the groundwater samples from monitor wells MW-3, <br /> MW-3A, MW-3D, and MW-13 at concentrations of 15, 0 57, 2 4, and 410 µg/l, <br /> respectively The CAMCL for benzene is 1.0 µg/l, exceeded in monitoring wells <br /> MW-3, MW-31) and MW-13 <br /> • Toluene was detected in monitor well MW-13 at a concentration of 76 µg/l The <br /> CAMCL for toluene is 150 µg/l. <br /> • Ethylbenzene was detected in monitor wells MW-3, MW-3D, and MW-13 at <br /> concentrations of 2 0, 13 and 310 µg/l, respectively The CAMCL for <br /> ethylbenzene is 700 µg/1, exceeded in MW-13 <br /> • Total xylenes were detected in monitor well MW-13 at a concentration of 7,400 <br /> µg/l,which exceeds the CAMCL of 1,750 gg/L <br /> • TPH(g) was detected in each monitor well sampled this quarter TPH <br /> concentrations ranged from 18 gg/L (MW-13B) to 53,000 µg/L (MW-13) There <br /> is no established CAMCL for this constituent <br /> • TBA was detected in monitor well MW-13 at a concentration of 320 µg/1 There <br /> is no formal CAMCL for this contaminant, however an action level has been <br /> established The action level for TBA is 12 gg/L and was exceeded in MW-13 <br />