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CALIFORNIA GEOPHYSICAL GROUP, INC. <br /> O Box 578341, Modesto, CA 95357 Tel (209) 527-1247 <br /> November 1, 2005 Fax (209) 527-4810 <br />' Public Health Services RECENED San Joaquin County <br /> 304 East Weber Ave 3rd Floor <br />' Stockton, CA 95202 NOV <br /> 82005 <br /> RE Quarterly Report October 2005 ENVIRONMENT HEALTH <br /> PERMIT/SERVICES <br /> Beneto Inc <br /> 749 E Charter Way <br /> Stockton, CA <br /> Site No 1060 <br />' This site was sampled on October 8, 2005 Argon Laboratories analyzed the samples, <br />' their report is attached <br /> Table 1 lists the history of the water table depths, elevations, water analyses and oxygen <br /> levels at this site since January 26, 1990 Table 2 lists the hydraulic gradients and <br /> bearings Sampling protocols are included <br /> FINDINGS <br /> The groundwater gradient bearing is N 79 E and the gradient is 0 0019 Ft/ft See Table 2 <br /> and Figure 1 <br /> Each well was measured for depth of water prior to any wells being purged The depth to <br /> water in the first measurement is written and noted on the sample sheets <br /> The groundwater in wells MW-1, MW-5, MW-6„MW-7, MW-8, MW-9 and MW-10, were <br /> above California Drinking Water Standards for benzene The benzene plume appears to <br /> be flowing east around well MW-1 Wells MW-7 and MW-9 are contaminated from sites, <br /> west of this site See Figure 2 <br /> The wells that had TPH are MW-1, MW-2, MW-3, MWS, MW-5, MW-6, MW-7, MW-8, <br /> MW-9, MW-10 MW-11and MW-16 Wells MW-7 and MW-9 are contaminated from sites <br /> entering this site from a source west of this site See Figure 3 <br /> MtBE was recorded in wells MW-1, MW-2, MW-3, MW-4, MW-8, MW-9, MW-11, MW-13 <br /> and MW-16 Wells MW-1, MW-2, MWA, MW-8, and MW-11 had levels over 5 ug/L <br /> Dissolved oxygen levels were recorded this quarter The measured levels are shown on <br /> Table 1 and Figure 5 <br /> Conclusions, <br /> t <br /> f <br />