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� AMBRIA <br /> Tables of current and historical analytical soil and groundwater data. <br /> Cumulative soil and grab groundwater analytical data are summanzed on Tables 1 and 2 <br /> Cumulative groundwater monitoring results are included in Appendix A <br /> Calculations showing estimates of the present dissolved and adsorbed contamutant masses of <br /> UTBE and TPHg. <br /> Groundwater sampling data collected over the past several quarters indicates there is no <br /> detectable TPHg or MTBE in the groundwater at this site, with the exception of the most recent <br /> (third quarter 2005) data where 12 ppb of MTBE was detected in well MW-1 These data <br /> indicate there is little if any remaining dissolved mass at this site As such, we did not prepare <br /> calculations of the dissolved contaminant mass <br /> Recent soil samples collected during UST system removal activities indicate there is no T <br /> MTBE present in soil in the vicinity of the northeastern UST location, the associated pipe/ <br /> the dispenser areas The former(northwestern)UST area contained a maximum concenti �6. <br /> 27 ppm TPHg (August 1996) Since this. TPHg detection appears to be of limited ex <br /> from nine years ago, and there has likely been biodegradation of this remaining mass r FI-1 & <br /> time period, we did not estimate the TPHg mass remaining ( yr <br /> A modeled estimate of the future impact to groundwater from adsorbed contaminants. <br /> The fate and transport model VLEACH(Version 2 2 0 2) was used to predict future groundwater <br /> impacts from MTBE-impacted soils previously detected beneath the subject site Cambria used <br /> site specific data to calibrate the model Site specific parameters that are most sensitive to the <br /> model output include MTBE concentrations, area, depth to groundwater, fraction organic carbon, <br /> soil texture, and soil water content Published data were used for MTBE chemical parameters <br /> A detailed discussion of the VLEACH model description, setup, and results is presented in <br /> Appendix D A summary of these findings is presented below <br /> The VLEACH model was run using maximum soil MTBE concentrations that were detected in <br /> soil samples collected during August 1996 A fine-grained silt loans soil was used as the <br /> representative soil profile covenng an estimated area of 176 feet2 The VLEACH model output <br /> predicts that the highest MTBE groundwater concentrations will occur after I year and <br /> 0323 6 <br />