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• EXECUTIVE SUMMARY <br /> Groundwater samples were collected from five monitor wells and one domestic well at the Gillies <br /> Trucking yard at 3931 Newton Road on September 4, 2003 One well was dry and was not <br /> sampled <br /> The static water level fell by nearly 5 feet since May and was 65 feet below grade on September 4 <br /> At this depth it is in the sand near the top of the Riverbank Formation, below the silt and clay of the <br /> Modesto aquitard below the Modesto channel aquifer and below the bottom of well GT-10 (59 45 <br /> feet) <br /> The water elevation data were contoured to yield a map of the piezometric surface The elevation <br /> contours again form an arc around well GT-1, and the water table slopes eastward or southward <br /> This is unchanged from the previous two quarters <br /> The water samples were analyzed for TPH-diesel, which was detected in one sample The <br /> concentration increased from 61 to 320 ppb in GT-9, but decreased from 420 ppb to less than 50 <br /> ppb in GT-6 and from 150 ppb to less than 50 ppb in GT-5 The concentration also remained below <br /> the detection limit in GT-1, GT-3, and in the Gillies domestic well Thus, as previous data have <br /> indicated, groundwater in the Riverbank Formation is generally not impacted or is impacted only <br /> very locally and infrequently Hence, we urge the regulatory agencies (San Joaquin County <br /> Lnvironmental Health Department, Central Valley Regional Water Quality Control Board, and <br /> State Water Board UST Cleanup Fund) to reconsider EHD's request for further site assessment and <br /> form a consensus regarding the issue of whether additional investigation is needed or warranted <br /> 1 <br />