ARCHIVED REPORTS XR0010728 - Laserfiche WebLink

Home Browse Search

' CALIFORNIA GEOPHYSICAL GROUP, INC, O Box 578341, Modesto, CA 95357 ��}l�rr Tel (209) 527-1247 January 31, 2006 E C L �1Fox (209) 527-4810 i FE€3 - L�J06 ' Public Health Services 1rNVIG['!I.f'�t 0 HEALTH San Joaquin County P4(titBI/SERVICES 304 East Weber Ave 3rd Floor Stockton, CA 95202 RE Quarterly Report January 2006 Beneto Inc ' 749 E Charter Way Stockton, CA Site No 1060 I This site was sampled on January 16, 2006 Argon Laboratories analyzed the samples, ' their report is attached Table 1 lists the history of the water table depths, elevations, water analyses and oxygen levels at this site since January 26, 1990 Table 2 lists the hydraulic gradients and bearings Sampling protocols are included FINDINGS The groundwater gradient bearing is N 79 E and the gradient is 0 0014 Ft/ft See Table 2 and Figure 1 Each well was measured for depth of water prior to any wells being purged The depth to water in the first measurement is written and noted on the sample sheets The groundwater in wells MW-1, MW-5, MW-6, MW-7, MW-8, MW-9 and MW-10, were ' above California Drinking Water Standards for benzene The benzene plume appears to be flowing southeast around well MW-1 Wells MW-7 and MW-9 are contaminated from sites, west of this site See Figure 2 The wells that had TPH are MW-1, MW-2, MW-3, MW-4, MW-5, MW-6, MW-7, MW-8, MW-9, MW-10, MW-11, MW-13 and MW-16 Wells MW-7 and MW-9 are contaminated Ifrom sites entering this site from a source west of this site See Figure 3 MtBE was recorded in wells MW-1, MW-2, MW-9, MW-11, MW-13 and MW-16 Wells MW-1, MW-2, MW-9 and MW-11 had levels over 5 ug/L IDissolved oxygen levels were recorded this quarter The measured levels are shown on Table 1 and Figure 5 I �