Laserfiche WebLink
RM Associates 701-0102 <br /> 2 2.2 Geologic Cross-Sections <br /> Geologic Cross-Sections are presented as Item II in Appendix A <br /> ' 2.2.3 Summary of Soil Analysis <br /> A summary of all soil analyses are presented as Item III in Appendix A <br /> ' 2 2.4 Cross-section of TPHg Profile in Sod <br /> ' Site map and TPHg profile are presented as Item IV in Appendix A <br /> 2 2.5 TPHg in Soil–Iso-Concentration Contour Map and Estimated Parameters for <br /> ' Mass Calculation <br /> TPHg Iso-Contour Map showing estimated parameters used in mass balance calculations are <br /> presented as Item V in Appendix A <br /> 2.2.6 Calculation of TPHg Mass in Soil—Pre-Remediation <br /> The pre-remediation TPHg in soil mass calculations are presented as Item VI in Appendix A The <br /> calculations are based upon the estimated parameters referenced under Section 2 2 5 above The <br /> estimated amount of pre-remediation TPHg in soil is calculated at 2,035 lbs Because of data <br /> limitations, this estimate carries a possible margin of error of at least 50 percent <br /> 2.3 Summary of Soil Investigation and Analysis <br /> ' Elevated hydrocarbon concentrations in the soil (>1000 milligrams per kilogram [mg/kg]) were only <br /> detected in the immediate vicinity of the former UST OST had estimated the radius of impacted <br /> t soil in the vadose zone to be less than 15 feet surrounding the former UST During the installation <br /> of what is now designated monitoring well BEI-MW3, the highest detected TPHg concentration was <br /> 5,300 mg/kg 15 feet below ground surface (bgs) This monitoring well is believed to be within the <br /> ' former UST excavation Soil Boring BEI-B-9 drilled one month earlier at the same approximate <br /> location, but most probably outside of the backfill area, had a maximum TPHg concentration of only <br /> 2,000 mg/kg <br /> The soil in the intermittently saturated smear zone (vertical interval of water table fluctuation) is <br /> estimated to have been impacted, to some extent, an area of approximately 4,500 square feet The <br /> ' hydrocarbon concentration in this zone was estimated to be in the range of 100 mg/kg to 300 mg/kg <br /> The vertical dimension of the smear zone is conservatively estimated at 10 feet and the average <br /> ' hydrocarbon (TPHg) concentration isestimated at 200 mg/kg <br /> ' Page 3 of 11 <br />