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One VOC (Toluene)was reported this quarter. This detection is less than the three reported the <br /> previous quarter. <br /> A Constituents of Concern Scan was conducted (Table 2)this quarter for well MW-6. Seventeen <br /> constituents were reported. Sixteen were reported as trace concentrations;just one was higher than <br /> the reporting limit. The COC scan testing for the first wells,MW-1 and MW-2, that were installed <br /> to sample to the deep aquifer also indicated similar concentrations of dissolved metals. <br /> MW-7: <br /> Well MW-7 was also sampled for the second time in October. Concentrations of inorganic <br /> constituents are within expected ranges (Table 2). There were no VOCs reported this quarter, in <br /> contrast to the three reported the previous quarter. <br /> The Constituents of Concern Scan indicated the presence of fourteen constituents (Table 2). Eleven <br /> were reported as trace concentrations; three were higher than the reporting limit. <br /> Surface Water <br /> "First storm"water samples for the 2003 -2004 storm season have not been taken due to lack of <br /> runoff during the fourth quarter 2003 monitoring event. First storm samples will be retrieved when <br /> flow is sufficient. <br /> GROUNDWATER DIRECTION AND FLOW RATE <br /> Shallow Aquifer <br /> Groundwater elevations at wells SB-1,MW-4,MW-5 and PZ-1 indicate that groundwater flow in <br /> the shallow water-bearing zone was bi-directional, to the northwest and to the southeast from well <br /> SB-1 (Figure 2). <br /> The average calculated groundwater velocity to the northwest between SB-1 and MW-5 is 1.51 ft/yr <br /> based on a gradient of 0.0054 foot per foot. The average calculated groundwater velocity to the <br /> southeast between SB-1 and MW-4 is 1.94 ft/yr based on a gradient of 0.0069 foot per foot <br /> (Appendix G). <br /> ' Deep Aquifer <br /> The groundwater elevations at MW-6 and MW-7 indicate that groundwater flow is northeasterly <br /> from MW-7 to MW-6 (Figure 3). The average calculated groundwater velocity is 1.11 ft/yr based on <br /> a gradient of 0.0040 foot per foot(Appendix G). <br /> Corral Hollow Landfill 6 Department of Public Works/Solid Waste <br /> 4T"Qtr/Annual 2003 Groundwater Monitoring County of San Joaquin-January 28,2004 <br />