Laserfiche WebLink
t� <br /> Mr Lawrence Beasley Project 22611-100 001 <br /> • July 18, 1997 <br /> Page 5 <br /> analytical result of the soil samples collected at the base of the UST (TPHG <br /> concentrations of 3,400 ppm) <br /> Hydrocarbons removed = 3,400 milligrams per kilograms (mg/kg) x 1x10-6 kg/mg x <br /> 97 5 lbs/fe; x 324 ft' <br /> =107.40 lbs of hydrocarbons removed by excavation <br /> Estimated Mass of Hydrocarbons Present Prior to SVE <br /> The estimated mass of hydrocarbons present in soil, prior to the startup of the SVE system, <br /> are based on analytical concentrations obtained in soil samples collected from borings <br /> VEW-1, MP-1, MP-2, MW-I through MW-7 and samples collected from beneath the <br /> excavation Figures 6 through 8 present the estimated extent of residual hydrocarbons that <br /> were present prior to SVE beneath the site at depths from surface grade to 16 feet, 17 to <br /> 41 feet,and 42 to 66 feet bgs <br /> The average concentration of hydrocarbons in the soil from surface grade to 16 feet bgs was <br /> obtained using analytical data from soil samples collected from borings MP-1, MP-2, <br /> • VEW-1 and the soil sample collected at the mase of the excavation TPHG concentrations <br /> ranged from below laboratory detection limits to 5,000 ppm EMCON's interpretation of <br /> the impacted area is depicted on Figure 6 <br /> The average concentration of hydrocarbons in the soil from 17 feet bgs to 41 feet bgs was <br /> obtained using analytical data from soil samples collected from borings MP-1, MP-2, <br /> VEW-1, MW-1 and MW-3 TPHG concentrations ranged from below laboratory <br /> detection limits to 13,000 ppm EMCON's interpretation of the impacted area is depicted <br /> on Figure 7 <br /> The average concentration of hydrocarbons in the soil from 42 feet bgs to 66 feet bgs was <br /> obtained using analytical data from soil samples collected from borings MP-1, MP-2, <br /> VEW-1, and MW-2 through MW-7 TPHG concentrations ranged from below laboratory <br /> detection limits to 5,000 ppm EMCON's interpretation of the impacted area is depicted <br /> on Figure 8 <br /> The dry densities used in the calculations are from geotechnical results obtained from the <br /> laboratory Summary of the parameters used are listed in Table 5 <br /> The estimated total pounds of hydrocarbons remaining in soil from surface grade to 16 feet <br /> bgs <br /> . Hydrocarbons remaining=2,100 mg/kg x 1 x I 0-6 kg/mg x 85 7 lbs/fl x 153,386 ft, <br /> SAC1K\2611CLOS URE-951dms <br />