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Table A-2 <br /> VAPOR CONCENTRATION ESTIMATE <br /> Tracy Railcard,Tram,Califontia <br /> ASSSUMED 501L PROPERTIES <br /> Bulk Density(a) 1.855 kg/I <br /> Porosity 0.4 (dimensionless) <br /> Volumetric Water Content(b) 0.36(dimensionless) <br /> Volumetric Air Content(e) 0 11 (dimensionless) <br /> Fraction Organic Content 001 (dimensionless) <br /> Estimated <br /> Average Soil Estimated Liquid Estimated Soil Groundwater Estimated Tota <br /> Concentration Estimated Soil Based Based Vapor Based Vapor Vapor <br /> Chemical �11N Kik II 11' KJ Conc(Reference1)/kg); I Vapor Concentration Concentration Concentration Concentration <br /> (Reference 1) (NS/ ) <br /> (NB/1) (Ppmv) (ppmv) (PP-V) <br /> 5.99E+00 6.47E+00 0.94 0.00 0.94 <br /> felrachloroethene 166 3.64E+02 2.59E-02 1.08E+00 3.64E+00 43.3 1761401 6.691:+00 1.22 0 W 1.22 <br /> 1 rich loro there 131.5 1261402 9 1011-03 3 79E-111 1 261:+(X) 483 6,98E+01 4.19E+01 7.54 0.44 7.98 <br /> 1,13 Trichloroethane 133 5 1.321:+02 1.441102 6 ME-01 1.321:+(X) 200.7 1.80E+O1 4.90E+00 1.22 3.12 4.34 <br /> c1,2 Dichloroethene 97 4.90E+01 6.56E-03 2 73E-01 4.90E-01 23.3 O(X1F+(X) 0.00E+00 0.00 0.28 0.28 <br /> I,I Dichloroethene 97 6 501..+01 3 401:-02 1•121..+(X) 6 50E-01 O U 8.44 1.51 9.95 <br /> 1,l Dichloroethane 98 3(X11:+(II 4 3111-11.3 1 7911-01 3 001:-UI 1&).0 1.9211+(12 3.441:+01 <br /> 7.00E+U1 2.39E+02 91.75 3.68 95.44 <br /> Vinyl Chloride 62 5 2.5llli+(X) 8.1911-02 3 411:+00 2 50E-02 54.7 + 6.22E-01 0.19 0.08 0.27 <br /> Benzene 78 6.50E+O1 5.50E-03 230E-01 3.90E-01 3.0 2.71E 00 <br /> 1.96E+02 4.31 E+Ol 9.77 0.57 �E <br /> BTEX 106 2.40E+02 5.30E-03 2 20E-01 1.40E+00 583.9 <br /> 10.34 <br /> Total VOCs= 3.33E+02 1.21E+02 9.68E+0011.31E+02 <br /> Clotal=CsOd+Cliquid+Cvapor(Reference 2) <br /> Clotal=(a)x Csoil+(b)x Cliquid+(c)x Cvapor <br /> Dotal=Cg'(a'Kd/Kh+b/Kh+c); Csoil=Kd•Cliquid; KJ=Ko 'Foc; Cvapor=l l'Cliquid - <br /> where, <br /> d=Bulk density(kg/I) <br /> b--Volumetric water content will-,soil vOlume 011"eswnless) <br /> c=VOlumetric air content within soil volume(dimesionless) <br /> MW=Molecular Weight <br /> Kd=Distribution coefficient(1/kg) <br /> 11-1 lenry's law Constant(dtm-m^3/mol) <br /> I'=henry's law Constant(dimensionless) <br /> Reference 1:Jury,W.A,el al,1983,Behavior Assessment Model for'Frace Organics in Soil;J.Environ.Quality 12:558-564. <br /> Reference 2:ERM 1997,Conceptual Design-2 Phase VOC Remediation Workplan. <br />