Ill. Admin. Code tit. 35, pt. 742, subpt. L, app C, tbl. B
Symbol | Parameter | Units | Source | Parameter Value(s) | ||
AT | Averaging Time for Noncarcinogens in Ingestion Equation | yr | Residential = 6 Industrial/Commercial = 25 Construction Worker = 0.115 | |||
AT | Averaging Time for Noncarcinogens in Inhalation Equation | yr | Residential = 30 Industrial/Commercial = 25 Construction Worker = 0.115 | |||
ATc | Averaging Time for Carcinogens | yr | SSL | 70 | ||
BW | Body Weight | kg | Residential = 15, noncarcinogens 70, carcinogens Industrial/Commercial = 70 Construction Worker = 70 | |||
Csat | Soil Saturation Concentration | mg/kg | Appendix A, Table A or Equation S29 in Appendix C, Table A | Chemical-Specific or Calculated Value | ||
Cw | Target Soil Leachate Concentration | mg/L | Equation S18 in Appendix C, Table A | Groundwater Standard, Health Advisory concentration, or Calculated Value | ||
d | Mixing Zone Depth | m | SSL or Equation S25 in Appendix C, Table A | 2 m or Calculated Value | ||
da | Aquifer Thickness | m | Field Measurement | Site-Specific | ||
ds | Depth of Source (Vertical thickness of contamination) | m | Field Measurement or Estimation | Site-Specific | ||
Symbol | Parameter | Units | Source | Parameter Value(s) | ||
DA | Apparent Diffusivity | cm2/s | Equation S10 in Appendix C, Table A | Calculated Value | ||
Di | Diffusivity in Air | cm2/s | Appendix C, Table E | Chemical-Specific | ||
Dw | Diffusivity in Water | cm2/s | Appendix C, Table E | Chemical-Specific | ||
DF | Dilution Factor | unitless | Equation S22 in Appendix C, Table A | 20 or Calculated Value | ||
ED | Exposure Duration for Ingestion of Carcinogens | yr | Industrial/Commercial = 25 Construction Worker = 1 | |||
ED | Exposure Duration for Inhalation of Carcinogens | yr | Residential = 30 Industrial/Commercial = 25 Construction Worker = 1 | |||
ED | Exposure Duration for Ingestion of Noncarcinogens | yr | Residential = 6 Industrial/Commercial = 25 Construction Worker = 1 | |||
ED | Exposure Duration for Inhalation of Noncarcinogens | yr | Residential = 30 Industrial/Commercial = 25 Construction Worker = 1 | |||
ED | Exposure Duration for the Direct Ingestion of Groundwater | yr | Residential = 30 Industrial/Commercial = 25 Construction Worker = 1 | |||
EDM-L | Exposure Duration for Migration to Groundwater Mass-Limit Equation S28 | yr | SSL | 70 | ||
EF | Exposure Frequency | d/yr | Residential = 350 Industrial/Commercial = 250 Construction Worker = 30 | |||
F(x) | Function dependent on Um/Ut | unitless | SSL | 0.194 | ||
foc | Organic Carbon Content of Soil | g/g | SSL or Field Measurement (See Appendix C, Table F) | Surface Soil = 0.006 Subsurface soil = 0.002, or Site-Specific | ||
GWobj | Groundwater Remediation Remediation Objective | mg/L | Appendix B, Table E, 35 IAC 620.Subpart F, or Equation S23 in Appendix C, Table A | Chemical-Specific or Calculated | ||
H' | Henry's Law Constant | unitless | Appendix C, Table E | Chemical-Specific | ||
i | Hydraulic Gradient | m/m | Field Measurement (See Appendix C, Table F) | Site-Specific | ||
I | Infiltration Rate | m/yr | SSL | 0.3 | ||
IM-L | Infiltration Rate for Migration to Groundwater Mass-Limit Equation S28 | m/yr | SSL | 0.18 | ||
IFsoil-adj (residential) | Age Adjusted Soil Ingestion Factor for Carcinogens | (mg-yr)/ (kg-d) | SSL | 114 | ||
IRsoil | Soil Ingestion Rate | mg/d | Residential = 200 Industrial/Commercial = 50 Construction Worker = 480 | |||
IRW | Daily Water Ingestion Rate | L/d | Residential = 2 Industrial/Commercial = 1 | |||
K | Aquifer Hydraulic Conductivity | m/yr | Field Measurement (See Appendix C, Table F) | Site-Specific | ||
Kd (Non-ionizing organics) | Soil-Water Partition Coefficient | cm3/g or L/kg | Equation S19 in Appendix C, Table A | Calculated Value | ||
Kd (Ionizing organics) | Soil-Water Partition Coefficient | cm3/g or L/kg | Equation S19 in Appendix C, Table A | Chemical and pH-Specific (see Appendix C, Table I) | ||
Kd (In-organics) | Soil-Water Partition Coefficient | cm3/g or L/kg | Appendix C, Table J | Chemical and pH-Specific | ||
Koc | Organic Carbon Partition Coefficient | cm3/g or L/kg | Appendix C, Table E or Appendix C, Table I | Chemical-Specific | ||
Ks | Saturated Hydraulic Conductivity | m/yr | Appendix C, Table K Appendix C, Illustration C | Site-Specific | ||
L | Source Length Parallel to Groundwater Flow | m | Field Measurement | Site-Specific | ||
PEF | Particulate Emission Factor | m3/kg | SSL or Equation S15 in Appendix C, Table A | Residential = 1.32 * 109 or Site-Specific Industrial/Commercial = 1.24 * 109 or Site-Specific | ||
PEF[PRIME] | Particulate Emission Factor adjusted for Agitation (construction worker) | m3/kg | Equation S16 in Appendix C, Table A using PEF (industrial/commercial) | 1.24 * 108 or Site-Specific | ||
Q/C (used in VF equations) | Inverse of the mean concentration at the center of a square source | (g/m2-s)/ (kg/m3) | Appendix C, Table H | Residential = 68.81 Industrial/Commercial = 85.81 Construction Worker = 85.81 | ||
Q/C (used in PEF equations) | Inverse of the mean concentration at the center of a square source | (g/m2-s)/ (kg/m3) | SSL or Appendix C, Table H | Residential = 90.80 Industrial/Commercial = 85.81 Construction Worker = 85.81 | ||
RfC | Inhalation Reference Concentration | mg/m3 | Illinois EPA: http://www.epa.state.il.us/land/taco/toxicity-values.xl | Toxicological-Specific (Note: for Construction Workers use subchronic reference concentrations) | ||
RfDo | Oral Reference Dose | mg/(kg-d) | Illinois EPA: http://www.epa.state.il.us/land/taco/toxicity-values.xls | Toxicological-Specific (Note: for Construction Workers use subchronic reference doses) | ||
ROsoil | Soil remediation objective | mg/kg | Equation S30 in Appendix C, Table A | Calculated value | ||
ROsoil gas | Soil gas remediation objective | mg/m3 | Equation S30 in Appendix C, Table A | Calculated value | ||
S | Solubility in Water | mg/L | Appendix C, Table E | Chemical-Specific | ||
SFo | Oral Slope Factor | (mg/kg-d)-1 | Illinois EPA: http://www.epa.state.il.us/land/taco/toxicity-values.xl | Toxicological-Specific | ||
T | Exposure Interval | s | Residential = 9.5 * 108 Industrial/Commercial = 7.9 * 108 Construction Worker = 3.6 * 106 | |||
TM-L | Exposure Interval for Mass-Limit Volatilization Factor Equation S26 | yr | SSL | 30 | ||
THQ | Target Hazard Quotient | unitless | SSL | 1 | ||
TR | Target Cancer Risk | unitless | 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 | |||
Um | Mean Annual Windspeed | m/s | SSL | 4.69 | ||
URF | Inhalation Unit Risk Factor | (µg/m3)-1 | Illinois EPA: http://www.epa.state.il.us/land/taco/toxicity-values.xl | Toxicological-Specific | ||
Ut | Equivalent Threshold Value of Windspeed at 7 m | m/s | SSL | 11.32 | ||
V | Fraction of Vegetative Cover | unitless | SSL or Field Measurement | 0.5 of Site-Specific | ||
VF | Volatilization Factor | m3/kg | Equation S8 in Appendix C, Table A | Calculated Value | ||
VF[PRIME] | Volatilization Factor adjusted for Agitation | m3/kg | Equation S9 in Appendix C, Table A | Calculated Value | ||
VFM-L | Mass-Limit Volatilization Factor | m3/kg | Equation S26 in Appendix C, Table A | Calculated Value | ||
VF[PRIME]M-L | Mass-Limit Volatilization Factor adjusted for Agitation | m3/kg | Equation S27 in Appendix C, Table A | Calculated Value | ||
[ETA] | Total Soil Porosity | Lpore/Lsoil | SSL or Equation S24 in Appendix C, Table A | 0.43, or Gravel = 0.25 Sand = 0.32 Silt = 0.40 Clay = 0.36, or Calculated Value | ||
[THETA]a | Air-Filled Soil Porosity | Lair/Lsoil | SSL or Equation S21 in Appendix C, Table A | Surface Soil (top 1 meter) = 0.28 Subsurface Soil (below 1 meter) = 0.13, or Gravel = 0.05 Sand = 0.14 Silt = 0.24 Clay = 0.19, or Calculated Value | ||
[THETA]w | Water-Filled Soil Porosity | Lwater/Lsoil | SSL or Equation S20 in Appendix C, Table A | 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 | ||
[RHO]b | Dry Soil Bulk Density | kg/L or g/cm3 | SSL 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 | ||
[RHO]s | Soil Particle Density | g/cm3 | SSL or Field Measurement (See Appendix C, Table F) | 2.65, or Site-Specific | ||
[RHO]w | Water Density | g/cm3 | SSL | 1 | ||
1/(2b+3) | Exponential in Equation S20 | unitless | Appendix C, Table K Appendix C, Illustration C | Site-Specific | ||
Ill. Admin. Code tit. 35, pt. 742, subpt. L, app C, tbl. B