ARCHIVED REPORTS_XR0010155 - Laserfiche WebLink

Home Browse Search

I I Former Canteen Facility June 10, 2042 Quarterly Groundwater Monrtorme Report Page 3 IGroundwater Gradient IInterpretation of the monitor well gauging data indicates that there is a south - southwesterly hydraulic gradient across the Site of approximately 0 001 feet/foot Figure I 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 I Diverting Canal, located approximately 1000 feet to the northeast The historical groundwater elevations are summarized on Table 1 Groundwater Analytical Results Groundwater analytical results are compared to the California Department of Health I Services Drinking Water Standard Maximum Contaminant Levels (CAMCL) Analysis of the seventeen groundwater samples obtained from the Site monitor wells indicated the following (• O Benzene was detected inoundwater les from monitor wells MW-3, MW- 3A, MW-31), and MW-13 at concentrations ranging from 0 60 to 16,000 µg/l Groundwater samples taken from monitor wells MW-3, MW-3D, and MW-13 exceeded the CAMCL for benzene of 1 0 µg/l • Toluene was detected in monitor wells MW-3, MW-3A, MW-313, MW-13, and MW-13A at concentrations ranging from 1 to 26,000 µg/1 The CAMCL for toluene is 150 µg11, exceeded only in MW-13 • Ethylbenzene was detected in monitor wells MW-3, MW-3D, and MW-13 at concentrations ranging from 2 1 to 3,700 µg/1 The CAMCL for ethylbenzene is 700 µg/1, exceeded only in MW-13 I + Total xylenes were detected in monitor wells MW-3, MW-3D, MW-5, MW-13, and MW-13A at concentrations ranging from 2 7 to 20,000 µg/1 The CAMCL Ifor xylenes is 1,750 µg/L, exceeded only in MW-13 • TPH(g) was detected in monitor wells MW-3, MW-3A, MW-3D, and MW-13 at concentrations ranging from 110 to 140,000 µg/l ��L/C£S��