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n M <br /> I CALIFORNIA GEOPHYSICAL GROUP, INC, <br /> O Box 578341, Modesto, CA 95357 Tel (209) 527-1247 <br /> August 8, 2005 Fax (209) 527-4810 <br /> 4 ' <br />' Public Health Services J , <br /> San Joaquin County D <br /> 304 East Weber Ave 3rd Floor 4d� ' <br />' Stockton, CA 95202 ' 4 2005 <br /> RE Quarterly Report July 2005 �1HSrN <br /> Beneto, Inc <br />' 749 E Charter Way <br /> Stockton, CA <br /> Site No '1060 <br />' sampled on Jul 12 2005 Castle Labs analyzed the samples, their report is <br /> This site was sa p y yz P <br /> 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 variable See Table 2 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-2, MW-4, MW-5, MW-6, MW-7, MW-8, MW-9, MW- <br /> 10 and MW-13 were above California Drinking Water Standards for benzene The <br />' benzene plume appears to be flowing 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 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-11 and MW-13 Wells MW-7 and MW-9 are contaminated from sites <br /> 'W 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-5, MW-6, MW-7, MW-8, <br /> MW-9, MW-11 and MW-13 Wells MW-1, MW-2, MW-5, MW-7, MW-9 and MW-11 had <br /> 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 /> i <br />