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Cealogkol Tec%iccs t co <br /> 1101 74�Street <br /> Modesto,California 95354 <br /> (209)522-4119/Fax(209)522-4227 <br /> ' REPORT <br /> Additional Site Characterization <br /> Soil & Groundwater Investigation <br /> Valentine (Castle Motors) <br /> 2315 N. El Dorado St. <br /> ' Stockton, CA <br /> Project No 723 2 <br /> May 9, 2006 <br /> MEXECUTIVE SUMMARY <br />' Geological Technics Inc has prepared the following Report for the site characterization field <br /> activities completed on February 21 thru 23, 2006 Three (3) cone penetrometer borings were <br /> advanced at the site to better define the down gradient extent of the groundwater plume <br />' Several discrete soil samples and groundwater samples were attempted in each boring <br /> location <br />' The soils encountered during this mobilization were primarily fine grained silt/clay units with <br /> lesser sands and gravels Some sand layers are present that have the potential to be <br /> preferential migration pathways for contaminant transport and depths below 60 feet The <br />' laboratory results show that the groundwater plume is limited in lateral extent and appears to <br /> attenuate to low levels in the locations of the three CPT borings advanced to the northeast <br />' east of the site It appears that the groundwater plume is co-mingled with releases from the <br /> adjacent Shell Station across El Dorado Street <br /> The contaminant distribution clarified in this investigation will be used to perform new mass <br /> balance calculations and to develop a Site Conceptual Model (SCM) for the site <br />