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1 <br /> Report <br /> Buffalo Tank Corporation <br /> July 15, 1993 <br /> Page -4- <br /> Significantly lower concentrations of BTEX were detected beneath <br /> the west end of T1 at a depth of 20 feet. No TEPH or BTEX were <br /> detected in the soil beneath the south end of T2 at the 17 foot <br /> depth. <br /> 4.0 Remedial Options <br /> Two common options available for further definition of the <br /> extent of contamination in the soil are: (1) exploratory drilling <br /> and (2) additional over-excavation. <br /> Drilling and soil sampling are conducted to investigate the <br /> vertical and horizontal extent of soil contamination. Typically <br /> this requires four or five soil borings placed around the former <br /> tank site. Once a zero detection limit has been established <br /> around the soil contamination plume, other means of remediation, <br /> such as over-excavation, vapor extraction, and/or in-situ <br /> bioremediation, can be used. <br /> Over-excavation is conducted to remove as much contaminated <br /> soil as possible. Due to the proximity of the nearby buildings <br /> it may not be possible to remove all of the contamination by <br /> over-excavation. In such case, other means of remediation would <br /> be needed to address the remaining contamination. <br /> If you have any questions or need any additional <br /> information, please call me at (209 ) 668-9234 . <br /> Respectfully submitted, <br /> Linda M. Allen Donald T. Bish <br /> Hydrogeologist Regi 1 st <br /> Sta S nia <br /> Enclosures #4 <br /> DONAID T.B;SND;' " <br /> N0.4852 <br /> JW2,Buffalo.RPT <br /> OF cAu4°�`SP <br /> CONDOR <br />