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' Appendix A -- Calculation of Mass of Contaminants - prior to remediation <br />' thickness x area =volume <br /> volume x density= total mass of soil <br /> total mass of soil x concentration=mass of contaminants <br /> ' DSS Model <br /> Density of soil= 1.5 g/cmr (approximately 1.26 tons/yard) <br /> ' 0'to 18' (clay and sandy clay)samples Line 1 @ 6', B 1-15' and VE 1-15'. <br /> 18' to 38'(clayey gravel) samples VE1-25', 132-20' and B2-25'. <br /> ' 38'to 55'(sand) samples B1-45'and VE-40' <br /> DSS Model Example Calculation, Layer 1-benzene <br /> 18 feet x 0.3048 m/ft=5.4 meters thickness <br /> 6.7 rn x 8 m wide x-.8 m length =430 m3 volume <br /> =4.3 x 10$ cm3 volume <br /> 4.3 x 103 cm3 x 1.5 Wen-? = 6.4 x 10 3 grazes of soil <br /> =6.4x105kgsoil <br /> 6.4 x 105 kg of soil x 96 mg/kg (benzene) =6.2 x 107 mg of benzene <br /> ' = 62 kg of benzene <br /> ' DSS Model Example Calculation, Layer 2 -benzene <br /> 20 feet x 0.3048 mlft= 6.1 meters thickness <br /> 6.1 m x 8 m wide x 8 m length =390 m3 volume <br /> =3.9 x 108 cm3 volume <br /> 3.9 x 103 cm3 x 1.5g/cm' = 5.85 x 10 8 grazes of soil <br /> =5.85 x 10 5 kg soil <br /> ' 5.85 x 105 kg of soil x i 1 mg/kg(benzene) = 6.4 x 10 6 mg of benzene <br /> = 6.4 kg of benzene <br /> ' DSS Model Example Calculation, Layer 3 -benzene <br /> 47 feet x 0.3048 m/ft=5.2 meters thickness <br /> 5.2 m x 8 m wide x 8 m length =333 m3 volume <br /> = 3.3 x 10 3 cm3 volume <br /> 3.3 x 10 s cm3 x 1.5g/c r3 = 5.0 x 10 8 grams of soil <br /> ' =5.0 x 10 5 kg soil <br /> 5.0 x 105 kg of soil x 0.04 mg/kg(benzene) = 19 x 10 4 rng of benzene <br /> = 0.019 kg of benzene <br /> 1 <br />