ARCHIVED REPORTS_XR0011485 - Laserfiche WebLink

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i 8 x_ Concentration contours of contaminants found and those remaining in soil and groundwater, both onsite and offsite x Lateral extent of soil contamination (Figure 7) x Vertical extent of soil contamination(Figure 4) x Lateral extent of groundwater contamination(Figures 8, 9 and 10) x Vertical extent of groundwater contamination (Figure 4) 9 x Zone of influence calculated and assumptions used for subsurface remediation system and the zone of capture attained for the soil and groundwater remediation system Due to low levels of impact to soil and groundwater, a remediation system was not installed at the site Source removal was the remediation technique employed at this site Natural attenuation is assumed to be the best ongoing remedial process for the constituents present at the site 10 x Reports/information A bibliography of reports has been included in Appendix B of the Closure Report • 11 x Best Available Technology(BAT) used Natural attenuation is the BAT for TPH G, the primary constituent found in the soil at the site 12 x Reasons why background was/is unattainable using BAT Background should be attainable using natural attenuation 13 x Mass balance calculation of substance treated versus that remaining The estimated remaining amount of TPH G in soil is 3 77 pounds The estimates of TPH G, benzene, and MTBE remaining in groundwater are 0 238 pounds, 0 060 pounds, and 0 149 pounds respectively 14 x Assumptions, parameters, calculations and model used in risk assessments and fate and transport modeling E The constituent concentrations detected in soil and groundwater, and the estimated mass balance of constituents remaining at the site were so small and were restricted to such a limited area that a human health risk analysis was not conducted