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X <br />' 4.0 SITE REMEDIATION <br /> The Best Available Technology (BAT) used to remediate the site included soil excavation and <br />' natural attenuation of contaminants through microbial action. Section 3 1 presents the volumes <br /> of soil and mass of contaminants removed during soil excavation and remaining after soil was <br />' excavated. Background (i e., non detect) concentrations of TPHe in soil was unattainable during <br /> tank excavation due to the large volume of soil that would have to be removed and disposed of. <br /> TPHe remaining in soil should not pose a threat to groundwater because of the low <br /> concentrations present (less than 70 mg/kg) and the depth to groundwater (42 ft bgs) Over time <br /> 1 the TPHe remaining in soil will naturally degrade through microbial action <br /> Active groundwater remediation was not conducted at the site However, the low concentrations <br /> of TPHe should decrease over time as natural degradation occurs The water supply well <br /> located on the site is regularly tested and has not been impacted by TPHe <br /> 1 <br />' UPROJECrSLSANJOQWCMVCD 5 3 May 1996 <br />