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---------- <br /> RPM <br /> ,;. Calculation of Residual Mass of Contaminants <br /> thickness x area=volume <br /> ' volume x density=total mass of soil <br /> total mass of soil x concentration=mass of contaminants <br /> Density of soil= 1.5 g/cm3 (approximately 1.26 tons/yard) <br /> Residual - 25'to 40' (sand to clayey sand) samples CB1-30' and CB1- 35' <br /> r : <br /> Mass Calculation, Residual - TPH-g <br /> 15 feet x 0.3048 m/ft=4.5 meters thickness <br /> 4.5 m x 3 m wide x 5 m length =68.6 m3 volume <br /> =6.86 x 10'cm'volume <br /> 6.86 x 10'cm3 x 1.5g/cm3 = 1.0 x 10'grams of soil <br /> —1.0 x 10 5 kg soil <br /> 1.0 x 105 kg of soil x 51 mg/kg(TPH-g) =5.1 x 10 6 mg of TPH-g <br /> =5.1 kg of TPH-g <br /> Thickness volume Mass of Soil Concentrations of Residual Mass of <br /> (meters) (cubic meters) (kilograms) Contaminants(mg/kg) Residual Contaminants <br /> "lo ams <br /> F: == 15 feet=4.5 m 68.6 100,000 TPH- =51 TPH-g =5.1 <br /> Based on the confirmation soil samples collected an estimated 5.1 kg of TPH-g were present in the soil after <br /> site mitigation. <br /> >i <br /> -i <br /> I <br /> Advanced GeoEnvironmental,Inc. <br /> :1 <br /> i <br />