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CALIFORNIA GEOPHYSICAL GROUP, INC, <br /> O Box 578341, Modesto, CA 95357 REC[E�V[EDD Tel (209) 527-1247 <br /> May3, 2006 Fax (209) 527-4810 <br /> MAY -1 5 N06 <br /> Public Health Services ENVIRON IENT I IEALTH <br /> San Joaquin County PERh4IT/SEPV10ES <br /> 304 East Weber Ave 3rd Floor <br />' 'Stockton, CA 95202 <br /> RE Quarterly Report April 2006 <br /> i' <br /> Beneto Inc <br /> i 749 E Charter Way <br /> Stockton, CA <br /> Site No 1060 <br /> iThis site was sampled on April 14 2006 Argon Laboratories analyzed the samples, their <br /> 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 0009 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, MW-10 and MW-13 <br /> were'above California Drinking Water Standards for benzene The benzene plume <br /> appears to be flowing southeast around well MW-1 Wells MW-7 and MW-9 are <br /> contaminated from sites, west of this site See Figure 2 <br />' The wells with TPH are MW-1, MW-2, MW-3, MW-4, MW-5, MW-6, MW-7, MW-8, MW-9, <br /> MW-10, MW-13 and MW-16 The contamination in wells MW-7 and MW-9 is coming from <br /> another source west of this site See Figure 3 ' <br /> MtBE was present in wells MW-1, MW-2, MW-4, MW-7, MW-8, MW-9, MW-12, MW-13 <br /> and MW-16 See Figure 4 Wells MW-1, MW-2, MW-7, MW-9 and MW-12 had levels <br />' 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 />