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Original Calculation of Mass of Contaminants thickness x area=volume - volume x density=total mass of soil total mass of soil x concentration=mass of contaminants T Density of soil= 1.5 g/cm3 (approximately 1.26 tons/yard) 1- 10'to 20' (clay and sandy clay)samples UST @ 10', VW1-15' and B1-20'. 2- 20'to 35' (sand) samples B1-25', B1- 30', BI-35' , VW1-25', VW1-35', VW2-25' and B2-25'. - 3- 35' to 45' (clayey sand) samples VWl-35', VW1-40', B1-35', VW2-35' and VW2-40'. r== Mass Calculation, Layer 1- TPH-g 10 feet x 0.3048 m/ft=3.05 meters thickness -: 3.05 m x 3 m wide x 5 m length =46.5 m'volume 4.6 x 10'cm'volume 4.6 x 10'cm3 x 1.5g/cm3 =6.9 x 10'grams of soil 6.98 x 10'kg soil '. 6.98 x 10'kg of soil x 250 mg/kg(TPH-g)- 1.7 x 10'mg of TPH-g = 17 kg of TPH-g Mass Calculation, Layer 2 - TPH-g 15 feet x 0.3048 m/ft-4.5 meters thickness [ =i 4.5 m x 3 m wide x 5 m length =68.6 m3 volume -6.86 x 10'cm3 volume 6.86 x 10'cm3 x 1.5g/cm3 = 1.0 x 10 8 grams of soil =1.0 x 10'kg soil L 1.0 x 105 kg of soil x 670 mg/kg(TPH-g) =6.8 x 10'mg of TPH-g 68 kg of TPH-g Mass Calculation, Layer 3 -TPH-g 10 feet x 0.3048 m/ft=3.05 meters thickness 3.05 m x 3 m wide x 5 m length =46.5 m3 volume =4.6 x 10'cm'volume ti=s 4.6 x 10'cm'x 1.5g/cm3 =6.9 x 10'grams of soil =6.98x 10'kgsoil 6.98 x 10'kg of soil x 325 mg/kg(TPH-g)=2.3 x 10'mg of TPH-g 23 kg of TPH-g •r`1 Thickness Volume Mass of Soil Concentrations of Mass of Contaminants meters (cubic meters) (kilograms) Contaminants(mg/kg) (kilograms) .. 10 feet=6.05 m 46.5 69,800 TPH-g =250 TPH-g = 17 i;- 15 feet=4.5 m 68.6 100,000 TPH-g =670 TPH-g =6$ 10 feet=6.05 m 46.5 69,800 TPH-g =325 TPH-g =23 UAn estimated 108 kg of TPH-g were present in the soil prior to site mitigation. Advanced GeoEnvironmental,Inc. V'.