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i Calculated Mass of TPH-d in Soil Former FISCO WAREHOUSE. ' 1648 Shaw Road, Stockton, California ESTIMATED MASS OF TPH-D REMAU1T11N'G ,N SOIL, Calculation of the mass of TPH-d remaining in soil is based on assumptions of average concentrations of analytical results for soil samples collected from underground storage tank(UST) hand samples and soil bonngs between 1986 and 2003 The estimated area of TPH-d-Impacted soil is Illustrated on Figures 2,5 and 6 The assumptions for the mass calculations are basc,d on analytical data, results and findings of site Investigation reports, and field observations Investigation findings Indicate that the majority of TPH-d-impact to soil is located in the area beneath the former USTs, at an interval of approximately 10 to 55 feet bsg (Figures 5 and 6) The calculations are divided Into two areas,one greater than 1,000 mg/kg and one greater than 1 0 mg/kg The calculation for an elliptic cylinder mass Is as follows Ve= (ir a b h), where "a" is the long semi-axis of the ellipse, "b" Is the Intermediate semi- axis and "h" is the height of the cylinder Estimated Mass of TPH--d Assumptions o Average area,thickness and concentration of TPH-d inside the greater than 1,000 mg/kg iso- concentration contour line are 242 ftZ, 22 5 feet and 3,752 mg/kg, respectively o Average area, thickness and concentration of TPH-g inside the greater than 1 0 mg/kg iso- concentration contour line are 966 ftZ, 45 feet and 1 8 mg/kg (manus the inner area), respectively a Average weight of soil 100 lbs/ft3 (per unit volume) • Average weight of diesel 7 0 lbs/gallon Calculations for the inner Y elliptic cylinder mass p 1) Ve= (Tr x II ftx7ftx225ft) = 5,443 ft' 2) 5,443 ft' x 100 lbs/ft' = 544,300 lbs soil 3) 3,752 mg/kg (TPH-d) x 1kg/1 Ox 106 mg x 544,300 lbs = 2,042 lbs diesel Advanced GeoEnvironmental,Inc I