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source in 1995 The groundwater monitoring results dhd not suggest that active groundwater <br /> • rernediation was necessary at this site <br /> I <br /> The effectiveness of the source removal actions was evaluated by using a USEPA <br /> mathematical model VLEACHSM to predict the maximum potential impact of the residual <br /> TPH as diesel in the soil to the groundwater The model predicted an average area-weighted <br /> concentration of 44 pg/L for TPH as diesel in the groundwater, which was consistent with the <br /> average groundwater concentrations measured in the monitoring wells in February, May and <br /> August of 1996 (87pg/L, <50 pg/L and <50 pg/L respectively) <br /> A mass balance calculation indicated that source removal alone resulted in the reduction of <br />' the mass of TPH as diesel in the vadose zone from 3,685 pounds (lbs), or 358 gallons to <br /> 1,203 lbs, or 160 gallons This action effectively remediated the residual mass of diesel in <br /> the soil by 67 percent This does not include the effect of intrinsic bioremediation, which <br /> would greatly increase the effective remediation <br /> The corrective actions implemented at the Lipton site have resulted ted in the removal of the TPH <br /> 10 <br /> as diesel source and the infiiltration migration pathway from the source area, primarily by <br /> backfilling and paving the surface at the source area These actions have reduced the <br /> potential TPH as diesel impact to the groundwater in excess of the action levels The site <br /> therefore poses a low-risk to human health and the environment, and should be closed with no <br /> further corrective action required <br />' MZffi&13­97/VDBF/97-0009 BK V <br />