C Tier 2 Illustrations and Tables

Section 742.APPENDIX C   Tier 2 Illustrations and Tables Section 742.TABLE D   RBCA Parameters Symbol Parameter Units Source Parameter Value(s) AT c Averaging Time for Carcinogens yr RBCA 70 AT n Averaging Time for Noncarcinogens yr RBCA Residential = 30 Industrial/Commercial = 25 Construction Worker = 0.115 BW Adult Body Weight kg RBCA 70 C source The greatest potential concentration of the contaminant of concern in the groundwater at the source of the contamination, based on the concentrations of contaminants in groundwater due to the release and the projected concentration of the contaminant migrating from the soil to the groundwater. mg/L Field Measurement Site-Specific C (x) Concentration of Contaminant in Groundwater at Distance X form the source mg/L Equation R26 in Appendix C, Table C Calculated Value C (x)/ C source Steady-State Attenuation Along the Centerline of a Dissolved Plume unitless Equation R15 in Appendix C, Table C Calculated Value d Lower Depth of Surficial Soil Zone cm Field Measurement 100 or Site-Specific (not to exceed 100) D air Diffusion Coefficient in Air cm 2 /s Appendix C, Table E Chemical-Specific D water Diffusion Coefficient in Water cm 2 /s Appendix C, Table E Chemical-Specific Symbol Parameter Units Source Parameter Value(s) D s eff Effective Diffusion Coefficient in Soil Based on Vapor-Phase Concentration cm 2 /s Equation R6 in Appendix C, Table C Calculated Value ED Exposure Duration yr RBCA Residential = 30 Industrial/Commercial = 25 Construction Worker = 1 EF Exposure Frequency d/yr RBCA Residential = 350 Industrial/Commercial = 250 Construction Worker = 30 erf Error Function unitless Appendix C, Table G Mathematical Function f oc Organic Carbon Content of Soil g/g RBCA or Field Measurement (See Appendix C, Table F) Surface Soil = 0.006 Subsurface Soil = 0.002 or Site-Specific GW comp Groundwater Objective at the Compliance Point mg/L Appendix B, Table E, 35 IAC 620.Subpart F, or Equation R25 in Appendix C, Table C Site-Specific GW source Groundwater Concentration at the Source mg/L Equation R13 in Appendix C, Table C Calculated Value H' Henry's Law Constant cm 3 water /cm 3 air Appendix C, Table E Chemical-Specific i Hydraulic Gradient cm/cm (unitless) Field Measurement (See Appendix C, Table F) Site-Specific I Infiltration Rate cm/yr RBCA 30 IR air Daily Outdoor Inhalation Rate m 3 /d RBCA 20 IR soil Soil Ingestion Rate mg/d RBCA Residential = 100 Industrial/Commercial = 50 Construction Worker = 480 IR w Daily Water Ingestion Rate L/d RBCA Residential = 2 Industrial/Commercial = 1 K Aquifer Hydraulic Conductivity cm/d for Equations R15, R19 and R26 cm/yr for Equation R24 Field Measurement (See Appendix C, Table F) Site-Specific K oc Organic Carbon Partition Coefficient cm 3 /g or L/kg Appendix C, Table E or Appendix C, Table I Chemical-Specific Symbol Parameter Units Source Parameter Value(s) k s (non-ionizing organics) Soil Water Sorption Coefficient cm 3 water /g soil Equation R20 in Appendix C, Table C Calculated Value k s (ionizing organics) Soil Water Sorption Coefficient cm 3 water /g soil Equation R20 in Appendix C, Table C Chemical and pH-Specific (See Appendix C, Table I) k s (inorganics) Soil Water Sorption Coefficient cm 3 water /g soil Appendix C, Table J Chemical and pH-Specific L s Depth to Subsurface Soil Sources cm RBCA 100 LF sw Leaching Factor (mg/L water )/ (mg/kg soil ) Equation R14 in Appendix C, Table C Calculated Value M Soil to Skin Adherence Factor mg/cm 2 RBCA 0.5 Pe Particulate Emission Rate g/cm 2 -s RBCA 6.9 • 10 -14 RAF d Dermal Relative Absorption Factor unitless RBCA 0.5 RAF d (PNAs) Dermal Relative Absorption Factor unitless RBCA 0.05 RAF d (inorganics) Dermal Relative Absorption Factor unitless RBCA 0 RAF o Oral Relative Absorption Factor unitless RBCA 1.0 RBSL air Carcinogenic Risk-Based Screening Level for Air μg/m 3 Equation R9 in Appendix C, Table C Chemical-, Media-, and Exposure Route-Specific RBSL air Noncarcinogenic Risk-Based Screening Level for Air μg/m 3 Equations R10 in Appendix C, Table C Chemical-, Media-, and Exposure Route-Specific RfD i Inhalation Reference Dose mg/kg-d IEPA (IRIS/HEAST a ) Toxicological-Specific RfD o Oral Reference Dose mg/(kg-d) IEPA (IRIS/HEAST a ) Toxicological-Specific (Note: for Construction Worker use subchronic reference doses) SA Skin Surface Area cm 2 /d RBCA 3,160 Symbol Parameter Units Source Parameter Value(s) S d Source Width Perpendicular to Groundwater Flow Direction in Vertical Plane cm Field Measurement For Migration to Groundwater Route: Use 200 or Site-Specific For Groundwater remediation objective: Use Site-Specific S w Source Width Perpendicular to Groundwater Flow Direction in Horizontal Plane cm Field Measurement Site-Specific SF i Inhalation Cancer Slope Factor (mg/kg-d) -1 IEPA (IRIS/HEAST a ) Toxicological-Specific SF o Oral Slope Factor (mg/kg-d) -1 IEPA (IRIS/HEAST a ) Toxicological-Specific THQ Target Hazard Quotient unitless RBCA 1 TR Target Cancer Risk unitless RBCA Residential = 10 -6 at the point of human exposure Industrial/Commercial = 10 -6 at the point of human exposure Construction Worker = 10 -6 at the point of human exposure U Specific Discharge cm/d Equation R19 in Appendix C, Table C Calculated Value U air Average Wind Speed Above Ground Surface in Ambient Mixing zone cm/s RBCA 225 Μg w Groundwater Darcy Velocity cm/yr Equation R24 in Appendix C, Table C Calculated Value VF p Volatilization Factor for Surficial Soils Regarding Particulates kg/m 3 Equation R5 in Appendix C, Table C Calculated Value VF samb Volatilization Factor (Subsurface Soils to Ambient Air) (mg/m 3 air )/(mg/kg soil ) or kg/m 3 Equation R11 in Appendix C, Table C Calculated Value Symbol Parameter Units Source Parameter Value(s) VF ss Volatilization Factor for Surficial Soils kg/m 3 Use Equations R3 and R4 in Appendix C, Table C Calculated Value from Equation R3 or R4 (whichever is less) W Width of Source Area Parallel to Direction to Wind or Groundwater Movement cm Field Measurement Site-Specific w Average Soil Moisture Content g water /g soil RBCA or Field Measurement (See Appendix C, Table F) 0.1, or Surface Soil (top 1 meter) = 0.1 Subsurface Soil (below 1 meter) = 0.2, or Site-Specific X Distance along the Centerline of the Groundwater Plume Emanating from a Source. The x direction is the direction of groundwater flow cm Field Measurement Site-Specific α x Longitudinal Dispersivity cm Equation R16 in Appendix C, Table C Calculated Value α y Transverse Dispersivity cm Equation R17 in Appendix C, Table C Calculated Value α z Vertical Dispersivity cm Equation R18 in Appendix C, Table C Calculated Value δ air Ambient Air Mixing Zone Heights cm RBCA 200 δ gw Groundwater Mixing Zone Thickness cm RBCA 200 θ as Volumetric Air Content in Vadose Zone Soils cm 3 air /cm 3 soil RBCA or Equation R21 in Appendix C, Table C Surface Soil (top 1 meter) = 0.28 Subsurface Soil (below 1 meter) = 0.13, o r Gravel = 0.05 Sand = 0.14 Silt = 0.16 Clay = 0.17, or Calculate Value Symbol Parameter Units Source Parameter Value(s) θ ws Volumetric Water Content in Vadose Zone Soils cm 3 water /cm 3 soil RBCA or Equation R22 in Appendix C, Table C Surface Soil (top 1 meter) = 0.15 Subsurface Soil (below 1 meter) = 0.30, or Gravel = 0.20 Sand = 0.18 Silt = 0.16 Clay = 0.17, or Calculated Value θ T Total Soil Porosity cm 3 /cm 3 soil RBCA or Equation R23 in Appendix C, Table C 0.43, or Gravel = 0.25 Sand = 0.32 Silt = 0.40 Clay = 0.36, or Calculated Value λ First Order Degradation Constant d -1 Appendix C, Table E Chemical-Specific π pi 3.1416 ρ s Soil Bulk Density g/cm 3 RBCA or Field Measurement (See Appendix C, Table F) 1.5, or Gravel = 2.0 Sand = 1.8 Silt = 1.6 Clay = 1.7, or Site-Specific ρ w Water Density g/cm 3 RBCA 1 τ Averaging Time for Vapor Flux s RBCA 9.46 • 10 8