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An estimation of soil and residual product is presented in Table 3 For the purpose of this <br /> estimation, dimensions of 6-feet long, by 4-feet wide, by Meet high were assigned to <br />' represent an impacted soil volume of 5 78 cubic yards for under the building Dimensions of <br /> 6-feet long, by 4-feet wide, by 6 5-feet high were assigned to represent an estimated impacted <br />' soil volume of 2 67 cubic yards for under the concrete electrical vault Note that these are <br /> estimated dimensions only and that actual dimensions may be less or greater The specific <br /> gravity of soil (approximately 1 2 tons per cubic yard) was then used to convert these soil <br />' volumes to weight The approximate weights of impacted soil are 2,903 kilograms for under <br /> the building and 6,289 kilograms for under the underground concrete electrical vault Using <br /> these weights, concentrations for each petroleum hydrocarbon compound were assigned an <br /> 1 estimated percentage of the total impacted soil and residual fuel volumes were calculated for <br /> each location Based on this method, it is estimated that approximately 2 3 gallons of TEPHd, <br /> 2 42 gallons of TEPHmo, and 0 08 gallons of TVH are residual in soil below the concrete <br />' electrical vault Residual petroleum hydrocarbons below the building %�as estimated at 2 12 <br /> gallons for TEPHd and 2 15 gallons for TEPHmo It should be noted that the total petroleum <br /> hydrocarbon concentrations are reported as fractional totals within the diesel range, motor oil <br /> range, and gasoline range and that reported concentrations may overlap between these ranges <br /> during laboratory quantitation As a result, the residual fuel volumes indicated above are <br /> merely approximations <br /> 4.2 Recommendations <br /> CAPE recommends performing an additional round of groundwater sampling to confirm that <br /> groundwater has not been impacted by the release of petroleum h}drocarbons from the <br /> previously existing USTs Analysis of water samples obtained during the proposed additional <br /> sampling should replicated those of the current investigation If results of this additional <br /> sampling round are consistent with the current findings, then it is recommended that the <br /> ' existing monitoring well be destroyed in compliance with applicable regulations <br /> 1 <br /> 1 <br /> 8 <br />