Illinois Administrative Code
Title 35 - ENVIRONMENTAL PROTECTION
Part 742 - TIERED APPROACH TO CORRECTIVE ACTION OBJECTIVES
Subpart L - BUILDING CONTROL TECHNOLOGIES
Appendix C - Tier 2 Illustrations and Tables
Table M - J and E Parameters
|
Symbol |
Parameter |
Units |
Source |
Tier 1 or Calculated Value |
|
AB |
Surface area of enclosed space at or below grade |
cm2 |
Equation J&E 12a or 12b, Appendix C, Table L |
Residential = 1 x 106 Industrial/Commercial = 4.0 x 106 |
|
Acrack |
Area of total cracks |
cm2 |
Equation J&E 14, Appendix C, Table L |
Calculated Value |
|
ATc |
Averaging time for carcinogens |
year |
SSL, May 1996 |
70 |
|
ATnc |
Averaging time for noncarcinogens |
year |
ATnc = ED |
Residential = 30 Industrial/Commercial = 25 |
|
Cvsat |
Soil vapor saturation limit |
mg/m3-air |
Equation J&E 5, Appendix C, Table L |
Chemical-Specific or Calculated Value |
|
Dcrackeff |
Effective diffusion coefficient through the cracks |
cm2/s |
Equation J&E 15, Appendix C, Table L |
Calculated Value |
|
Di |
Diffusivity in air |
cm2/s |
Appendix C, Table E |
Chemical-Specific |
|
Dieff |
Effective diffusion coefficient for each soil layer |
cm2/s |
Equation J&E 11, Appendix C, Table L |
Calculated Value |
|
Dsource |
Distance from ground surface to top of contamination |
cm |
Field Measurement |
Soil Gas Contamination = 152.4 Groundwater Contamination = 304.8 Site-Specific |
|
DTeff |
Total overall effective diffusion coefficient |
cm2/s |
Equation J&E 9a, Appendix C, Table L |
Calculated Value |
|
Dw |
Diffusivity in water |
cm2/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 |
|
foc |
Fraction organic carbon content |
g/g |
SSL, May 1996, or Field Measurement Appendix C, Table F |
0.002 or Site-Specific |
|
HB |
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 13C |
unitless |
Appendix C, Table E |
Chemical-Specific |
|
LB |
Length of building |
cm |
Illinois EPA |
Residential = 1000 Industrial/Commercial = 2000 or Site-Specific in Tier 3 |
|
Lcrack |
Slab thickness |
cm |
USEPA, Users Guide, 2004 |
10 |
|
LF |
Distance from ground surface to bottom of slab |
cm |
USEPA, Users Guide, 2004 |
10 (slab on grade) 200 (basement) |
|
Li |
Thickness of soil layer i |
cm |
Field Measurement for Capillary Fringe, USEPA, 2004 |
Site-Specific For Capillary Fringe, 37.5 cm |
|
LT |
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 |
|
Qbldg |
Building ventilation rate |
cm3/s |
Equation J&E 13, Appendix C, Table L |
Slab-on-Grade Residential = 3.59 x 104 Industrial/ Commercial = 3.15 x 105 or Site-Specific in Tier 3 Basement Residential = 6.28 x 104 Industrial/Commercial = 5.04 x 105 or Site-Specific in Tier 3 |
|
Qsoil |
Volumetric flow rate of soil gas into the enclosed space |
cm3/s |
USEPA, Users Guide for Evaluating Subsurface Vapor Intrusion into Buildings, 2004 |
If LT is less than 5 feet (152 cm), Qsoil equals 83.33. If LT is 5 feet (152 cm) or greater, Qsoil 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/m3 |
Illinois EPA: http://www.epa.state.il.us/land/taco/toxicity-values.xl |
Toxicological-Specific |
|
ROgw |
Groundwater remediation objective |
mg/L |
Appendix B, Table E, or Equation J&E 6, Appendix C, Table L |
Chemical-Specific or Calculated Value |
|
ROindoor-air |
Indoor air remediation objective |
mg/m3 |
Equations J&E 1 and 2, Appendix C, Table L |
Calculated Value |
|
ROsoilgas |
Soil gas remediation objective |
mg/m3 |
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 13oC) |
|
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/m3)-1 |
Illinois EPA: http://www.epa.state.il.us/land/taco/toxicity-values.xl |
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 |
|
WB |
Width of building |
cm |
Illinois EPA |
Residential = 1000 Industrial/ Commercial = 2000 or Site-Specific in Tier 3 |
|
[ALPHA] |
Attenuation factor |
unitless |
Equations J&E 7 or 8, Appendix C, Table L |
Site-Specific |
|
[THETA]a |
Air-filled soil porosity |
cm3/cm3 |
SSL, May 1996 or Equation J&E 18, Appendix C, Table L |
0.28 or Calculated Value |
|
[THETA]a,crack |
Air-filled porosity for soil in cracks |
cm3/cm3 |
SSL, May 1996 or Equation J&E 18, Appendix C, Table L |
0.13 |
|
[THETA]a,i |
Air-filled porosity of soil layer i |
cm3/cm3 |
SSL, May 1996 or Equation J&E 18, Appendix C, Table L |
0.13 or Calculated Value For capillary fringe, [THETA]a,i = 0.1 [THETA]T,i |
|
[THETA]T,crack |
Total porosity for soil in cracks |
cm3/cm3 |
SSL, May 1996 or Equation J&E 16, Appendix C, Table L |
0.43 |
|
[THETA]T,i |
Total porosity of soil layer i |
cm3/cm3 |
SSL, May 1996 or Equation J&E 16, Appendix C, Table L |
0.43 or Calculated Value |
|
[THETA]w |
Water-filled soil porosity |
cm3/cm3 |
SSL, May 1996 or Equation J&E 17, Appendix C, Table L |
0.15 or Calculated Value |
|
[THETA]w,crack |
Water-filled porosity for soil in cracks |
cm3/cm3 |
SSL, May 1996 or Equation J&E 17, Appendix C, Table L |
0.15 |
|
[THETA]w,i |
Water-filled porosity of soil layer i |
cm3/cm3 |
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 qT,i |
|
[THETA]b |
Dry soil bulk density |
g/cm3 |
SSL, May 1996 or Field Measurement, Appendix C, Table F |
1.5 or Calculated Value |
|
[THETA]s,i |
Soil particle density |
g/cm3 |
SSL, May 1996 or Field Measurement, Appendix C, Table F |
2.65 or Calculated Value |
|
[THETA]w |
Density of water |
g/cm3 |
Illinois EPA |
1 |
