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

Current through Register Vol. 48, No. 28, July 12, 2024
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 13C
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