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site monitoring wells have decreased to near or below detection limits Therefore, a mass balance <br /> calculation for current site conditions is not Justified <br /> 7 Technology used to clean the site, if Best Available Technology (BAT) was not used, explain <br /> why <br /> BAT was used to clean the site A GWE system was in operation at the site from March 1993 through <br /> September 1995 In addition, SVE and GWO were utilized to remediate the site Together, the <br /> systems removed approximately 3,300 pounds of total petroleum hydrocarbons from so►1 and <br /> groundwater beneath the site <br /> 8 Zone of influence calculated for the subsurface remediation system and the zone of capture <br /> attained for the soil and groundwater remediation system <br /> A map showing the estimated zone of influence for the SVE system is attached <br /> 9 Reasons why"background" was/is unattainable using BAT <br /> Background levels at the site have been attained No TPHg was detected in any of the site <br /> monitoring wells during the most recent groundwater monitoring event(July 2000) In addition, <br /> no BTEX was detected in site wells, with the exception of MW-4, where benzene and toluene <br /> were detected at 1 21 ppb and 1 09 ppb, respectively MtBE and HVOCs have been detected in <br /> site groundwater, but are apparently from an offsite source <br /> 10 Rationale why conditions remaining at the site will not adversely impact water quality, health <br /> or other beneficial uses <br /> o All potential hydrocarbon sources have been removed <br /> • Separate-phase hydrocarbon has never been present in site wells <br /> • TPHg or BTEX concentrations in site groundwater have been reduced to below or very near <br /> detection limits <br /> o MtBE and HVOCs detected in site groundwater apparently originated from an off site source <br /> A-2 <br />