C Tier 2 Tables

Section 742.APPENDIX C   Tier 2 Tables Section 742.TABLE M   J&E Parameters Symbol Parameter Units Source Tier 1 or Calculated Value A B Surface area of enclosed space at or below grade cm 2 Equation J&E 12a or 12b, Appendix C, Table L Residential = 1 x 10 6 Industrial/Commercial = 4.0 x 10 6 A crack Area of total cracks cm 2 Equation J&E 14, Appendix C, Table L Calculated Value AT c Averaging time for carcinogens year SSL , May 1996 70 AT nc Averaging time for noncarcinogens year AT nc = ED Residential = 30 Industrial/Commercial = 25 C v sat Soil vapor saturation limit mg/m 3 -air Equation J&E 5, Appendix C, Table L Chemical-Specific or Calculated Value D crack eff Effective diffusion coefficient through the cracks cm 2 /s Equation J&E 15, Appendix C, Table L Calculated Value D i Diffusivity in air cm 2 /s Appendix C, Table E Chemical-Specific D i eff Effective diffusion coefficient for each soil layer cm 2 /s Equation J&E 11, Appendix C, Table L Calculated Value D source Distance from ground surface to top of contamination cm Field Measurement Soil Gas Contamination = 152.4 Groundwater Contamination = 304.8  Site-Specific D T eff Total overall effective diffusion coefficient cm 2 /s Equation J&E 9a, Appendix C, Table L Calculated Value D w Diffusivity in water cm 2 /s Appendix C, Table E Chemical-Specific ED Exposure duration year Residential:  SSL, May 1996 Industrial/Commercial: SSL 2002 Residential = 30 Industrial/Commercial = 25 EF Exposure frequency day/year Residential:  SSL, May 1996 Industrial/Commercial:  SSL 2002 Residential = 350 Industrial/ Commercial = 250 ER Air exchange rate exchanges per hour Illinois EPA Residential = 0.53 Industrial/ Commercial = 0.93 f oc Fraction organic carbon content g/g SSL , May 1996, or Field Measurement Appendix C, Table F 0.002 or Site-Specific H B Height of building cm Illinois EPA Slab-on-Grade Residential = 244 Industrial/ Commercial = 305 or Site-Specific in Tier 3 Basement Residential = 427 Industrial/ Commercial = 488 or Site-Specific in Tier 3 H' TS Dimensionless Henry's law constant at the system (soil) temperature 13˚C unitless Appendix C, Table E Chemical-Specific L B Length of building cm Illinois EPA Residential = 1000 Industrial/Commercial = 2000 or Site-Specific in Tier 3 L crack Slab thickness cm USEPA, Users Guide, 2004 10 L F Distance from ground surface to bottom of slab cm USEPA, Users Guide, 2004 10 (slab on grade) 200 (basement) L i Thickness of soil layer i cm Field Measurement for Capillary Fringe, USEPA, 2004 Site-Specific For Capillary Fringe, 37.5 cm L T Distance from bottom of slab to top of contamination cm Field Measurement or Equation J&E 10, Appendix C, Table L 142.4 or Site-Specific MW Molecular weight g/mole Illinois EPA Chemical-Specific n Total number of layers of different types of soil vapors migrate through from source to building (if source is groundwater, include a capillary fringe layer of 37.5 cm as one of the layers) unitless Field Measurement Site-Specific P Vapor Pressure atm Appendix C, Table E Chemical-Specific Q bldg Building ventilation rate cm 3 /s Equation J&E 13, Appendix C, Table L Slab-on-Grade Residential = 3.59 x 10 4 Industrial/ Commercial = 3.15 x 10 5 or Site-Specific in Tier 3 Basement Residential = 6.28 x 10 4 Industrial/Commercial = 5.04 x 10 5 or Site-Specific in Tier 3 Q soil Volumetric flow rate of soil gas into the enclosed space cm 3 /s USEPA, Users Guide for Evaluating Subsurface Vapor Intrusion into Buildings, 2004 If L T is less than 5 feet (152 cm), Q soil equals 83.33. If L T is 5 feet (152 cm) or greater, Q soil equals zero. An input value of zero requires an institutional control. See Section 742.505(b) and (c). R Ideal gas constant atm-L/mol-K USEPA, Users Guide, 2004 0.08206 RfC Reference concentration µg/m 3 Illinois EPA:  http://www.epa.state.il.us/land/taco/toxicity-values.xls Toxicological-Specific RO gw Groundwater remediation objective mg/L Appendix B, Table E, or Equation J&E 6, Appendix C, Table L Chemical-Specific or Calculated Value RO indoor-air Indoor air remediation objective mg/m 3 Equations J&E 1 and 2, Appendix C, Table L Calculated Value RO soilgas Soil gas remediation objective mg/m 3 Equation J&E 4, Appendix C, Table L Calculated Value S Solubility in water mg/L Appendix C, Table E Chemical-Specific T Temperature °K USEPA, Users Guide, 2004 286 (converted from 13 o C) THQ Target hazard quotient for a chemical unitless SSL , May 1996 1 TR Target risk or the increased chance of developing cancer over a lifetime due to exposure to a chemical unitless SSL , May 1996 Residential = 10 -6 at the point of human exposure Industrial/Commercial = 10 -6 at the point of human exposure URF Unit risk factor (µg/m 3 ) -1 Illinois EPA:  http://www.epa.state.il.us/land/taco/toxicity-values.xls Toxicological- Specific w Floor-wall seam gap cm USEPA, Users Guide, 2004 0.1 W Moisture content g of water/g of soil Field Measurement, Appendix C, Table F Site-Specific W B Width of building cm Illinois EPA Residential = 1000 Industrial/ Commercial = 2000 or Site-Specific in Tier 3 α Attenuation factor unitless Equations J&E 7 or 8, Appendix C, Table L Site-Specific θ a Air-filled soil porosity cm 3 /cm 3 SSL , May 1996 or Equation J&E 18, Appendix C, Table L 0.28 or Calculated Value θ a,crack Air-filled porosity for soil in cracks cm 3 /cm 3 SSL , May 1996 or Equation J&E 18, Appendix C, Table L 0.13 θ a,i Air-filled porosity of soil layer i cm 3 /cm 3 SSL , May 1996 or Equation J&E 18, Appendix C, Table L 0.13 or Calculated Value For capillary fringe, θ a,i = 0.1 θ T,i θ T,crack Total porosity for soil in cracks cm 3 /cm 3 SSL , May 1996 or Equation J&E 16, Appendix C, Table L 0.43 θ T,i Total porosity of soil layer i cm 3 /cm 3 SSL , May 1996 or Equation J&E 16, Appendix C, Table L 0.43 or Calculated Value θ w Water-filled soil porosity cm 3 /cm 3 SSL , May 1996 or Equation J&E 17, Appendix C, Table L 0.15 or Calculated Value θ w,crack Water-filled porosity for soil in cracks cm 3 /cm 3 SSL , May 1996 or Equation J&E 17, Appendix C, Table L 0.15 θ w,i Water-filled porosity of soil layer i cm 3 /cm 3 SSL , May 1996 or Equation J&E 17, Appendix C, Table L For capillary fringe, US EPA, Users Guide 2004 0.15 or Calculated Value For capillary fringe = 0.375 or 0.9 q T,i θ b Dry soil bulk density g/cm 3 SSL , May 1996 or Field Measurement, Appendix C, Table F 1.5 or Calculated Value θ s,i Soil particle density g/cm 3 SSL, May 1996 or Field Measurement, Appendix C, Table F 2.65 or Calculated Value θ w Density of water g/cm 3 Illinois EPA 1