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/VP�lY� <br /> /t"�/VA <br /> Working To Restore Nature <br /> Available Technology for soil remediation at the site. Removal of all impacted soil was <br /> : . <br /> not possible due to an overlying building. Petroleum hydrocarbon impacted soil was <br /> removed by excavation from the areas which were accessible. <br /> o Based on groundwater analyses prior to excavation from downgradient wells MW3 and <br /> MW4 only minor and sporadic groundwater impact resulted from contact with <br /> contaminated soil. Sampling of well MW3 subsequent to source removal excavation has <br /> r.>I <br /> detected no groundwater impact. It is concluded that the organic rich, fine grained soils <br /> .:3 at the site are highly adsorptive of petroleum hydrocarbons. <br /> Gy.i <br /> C-' The shallow groundwater in the Tracy area is not suitable for consumption or irrigation <br /> and has limited beneficial use. It is not expected that residual soil contamination will <br /> result in measurable groundwater impact nor will public health or beneficial uses be <br /> a adversely affected. <br /> i-� <br /> 6.0 CONCLUSIONS AND RECOMMENDATIONS <br /> Source removal excavation succeeded in removing from the subsurface all accessible petroleum <br /> hydrocarbon contaminated soil. Residual soil contamination, inaccessible to excavation exists <br /> beneath a concrete floored building on site. Based upon historical analytical data, this residual <br /> soil contamination should not result in detectable groundwater degradation. <br /> No groundwater contamination currently exists, as evidenced by analyses of water samples from <br /> downgradient monitoring well MW3. Case closure is recommended. <br /> f^" OW01951REPORTSICLo12594.FNL 13 <br /> s�-z` <br />