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' 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 /> ' � <br /> Respectfully submitted, <br /> Lin / <br /> ' da M. Allen Donald T. Bish <br /> l <br /> Hydrogeoogist Regi 1 st <br /> Sta 5 nia <br /> Enclosures #4 DONALD T.E,SHm, <br /> NO.4852 <br /> ' JW2;Buffalo.RPT �[ <br /> P <br /> 9�OF CAW <br /> ' CONDOR <br />