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CAMRIA <br /> 13. Mass balance calculation of the substance treated versus that remaining, <br /> No soil samples have been collected at the site since 1999. Therefore, a mass balance calculation <br /> for current site conditions could not be prepared. However, an estimated 2,295,500 gallons of <br /> groundwater have been extracted at the site through GWE. Calculations based on extracted <br /> groundwater concentrations estimate approximately 1.8 pounds of total hydrocarbons and <br /> 15.2 pounds of MTBE have been removed at the site. Current groundwater concentration data <br /> indicates background levels have been attained at the site, therefore no mass remains in <br /> groundwater at the site. <br /> 14. Assumptions, parameters, calculations and model used in risk assessments, and fate and <br /> transport modeling; <br /> Not applicable; no models were used. <br /> r of ay-�,fv <br /> 7/zs- V <br /> 15. Rationale why conditions remaining at the site will not adversely impact water quality, <br /> health, or other beneficial uses; and <br /> o Separate-phase hydrocarbon has never been present in site wells. <br /> o TPHg and BTEX have not been detected in groundwater at the site since at least <br /> August 2004. <br /> ® MTBE has not been detected in groundwater at the site since at least October 2004. MTBE <br /> concentrations have been less than 5 ppb in site wells since at least October 2001. <br /> No rebound in groundwater concentrations was observed after the GWE system was shut <br /> down. <br /> 16. WET or TCLP results <br /> Not available. <br /> 0324 9 <br />