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bt�t , (f1 Mass Balance Calculation of TPH-g in Unsaturated Soil 215196) Estimated Volume of Impacted Soil 1200 sq ft x 6 ft = 7,200 cu ft r Estimated Average Concentration 3 9 ppm - Estimated Soil Density 100 lbs Icu ft Soil Mass Volume x Density Soil Mass = 7,200 cu ft x 100 Ibslcu ft = 720,000 lbs TPH Mass Sod Mass x Average Concentration ' TPH Mass = 720,000 lbs x 3 911,000,000 = 2 808 lbs TPH Mass = Unsaturated Soil 2 808 lbs Mass Balance Calculation of TPH-g in Saturated Soil [1'-3$ ' (215196) lz [ �` - Estimated Volume of Impacted Soil 1200 sq ft x ZO ft 24,600 cu ft Estimated Average Concentration 846 ppm Estimated Soil Density 100 lbs Icu ft Soil Mass Volume x Density '• Soil Mass = 24,600 cu ft x 100 lbs/cu ft = 2,460,000 lbs I TPH Mass Soil Mass x Average Concentration TPH Mass = 2,460,000 lbs x (846/1,000,000) = 2,081 lbs TPH Mass = Saturated Soil 2,081 lbs ASSUMPTIONS Unsaturated zone includes sods that have been historically above groundwater levels in the area See Table 1-Water Level Data Saturated zone includes sampled soils below the unsaturated zone (from 12 5 feet below ' ground surface to 33 feet below ground surface) See Table 3 -Analytical Results Soil Volume of Impacted Sod is based on the area emcompassing FugroIENSR monitoring wells and soil borings, and the depth of the zone See Figure 7 - Limits of Impacted Soil Estimated Average Concentration of TPH-g is based on an average of levels detected in I all applicable samples analyzed See Table 3 -Analytical Results Soil (saturated sod) and Table 4A- Summary of Results of Analysis, Soil Samples-Previous Investigations (unsaturated soil) L IENSR18716106 A02 soil As