New Jersey Administrative Code › Title 7 - ENVIRONMENTAL PROTECTION › Chapter 26D - REMEDIATION STANDARDS › Appendix 3

Current through Register Vol. 56, No. 14, July 15, 2024
DEVELOPMENT OF SOIL REMEDIATION STANDARDS FOR THE INHALATION EXPOSURE PATHWAY
This appendix describes the procedures and equations used by the Department to develop the soil remediation standards for the inhalation exposure pathway as contained at N.J.A.C. 7:26D Appendix 1, Tables 3 and 4. This appendix is also used to develop interim soil remediation standards for the inhalation exposure pathway pursuant to N.J.A.C. 7:26D-6 and for updating soil remediation standards for the inhalation exposure pathway pursuant to N.J.A.C. 7:26D-7.
If a calculated soil criterion for a contaminant for the inhalation exposure pathway is greater than its soil saturation limit for the volatile portion of the equation, the volatile component of the equation is not applicable in the development of the soil criterion for the inhalation exposure pathway.
If the calculated soil criterion for a contaminant for the inhalation exposure pathway is greater than one million parts per million, a soil remediation standard for that contaminant for the inhalation exposure pathway does not apply.
If the calculated soil criterion for a contaminant for the inhalation exposure pathway is less than the soil reporting limit for that contaminant, the soil remediation standard for that contaminant for the inhalation exposure pathway defaults to the soil reporting limit.
Equations 1 through 7 below are derived from the USEPA, Regional Screening Levels (RSLs)--Equations (November 2018). A detailed explanation of the derivation of Equations 1 and 2 is contained at N.J.A.C. 7:26D Appendix 12.
Equation 1--Carcinogenic Inhalation Human Health-Based Criteria
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Parameter
Definition
Units
Default
Inhc
Carcinogenic inhalation human health-based criterion
mg/kg
Chemical specific
TR
Target cancer risk
unitless
1 x 10-6
AT
Averaging time
days/year
365
LT
Lifetime
years
70
IUR
Inhalation unit risk factor
(µg/m3)-1
Chemical specific
EF
Exposure frequency
days/year
350 (Residential) 225 (Nonresidential)
VF
Soil-to-air volatilization factor
m3/kg
Chemical specific
PEF
Particulate emission factor
m3/kg
1.67 x 109 (Residential) 1.64 x 109(Nonresidential)
ED
Exposure duration
years
26 (Residential) 25 (Nonresidential)
ET
Exposure time
hours/day
24 (Residential) 8 (Nonresidential)
Equation 2--Noncarcinogenic Inhalation Human Health-Based Criteria
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Parameter
Definition
Units
Default
Inhnc
Noncarcinogenic inhalation human health-based criterion
mg/kg
Chemical specific
THQ
Target hazard quotient
unitless
1
AT
Averaging time
days/year
365
EF
Exposure frequency
days/year
350 (Residential) 225 (Nonresidential)
ED
Exposure duration
years
26 (Residential) 25 (Nonresidential)
ET
Exposure time
hours/day
24 (Residential) 8 (Nonresidential)
RfC
Reference concentration
mg/m3
Chemical specific
VF
Soil-to-air volatilization factor
m3/kg
Chemical specific
PEF
Particulate emission factor
m3/kg
1.67 x 109 (Residential) 1.64 x 109(Nonresidential)
Equation 3--Volatilization Factor (VF)
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Parameter
Definition
Units
Default
VF
Soil-to-air volatilization factor
m3/kg
Chemical specific
Q/C
Inverse concentration at center of source
(g/m2-s)/ (kg/m3)
86.6 (Residential) 85 (Nonresidential)
DA
Apparent diffusivity
cm2/s
Chemical specific
T
Exposure interval
seconds
8.20 x 108
pb
Dry soil bulk density
g/cm3
1.5
Equation 4--Apparent Diffusivity (DA)
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Parameter
Definition
Units
Default
DA
Apparent diffusivity
cm2/s
Chemical specific
[THETA]a
Air-filled soil porosity
Lair/Lsoil
0.18
Di
Diffusivity in air
cm2/s
Chemical specific
H'
Henry's law constant
unitless
Chemical specific
[THETA]w
Water-filled soil porosity
Lwater/Lsoil
0.23
Dw
Diffusivity in water
cm2/s
Chemical specific
n
Total soil porosity
Lpore/Lsoil
0.41
pb
Dry soil bulk density
g/cm3
1.5
Kd
Soil-water partition coefficient
cm3/g
Chemical specific
Equation 5-Soil--Water Partition Coefficient (Kd)
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Parameter
Definition
Units
Default
Kd
Soil-water partition coefficient
cm3/g
Chemical specific
Koc
Soil organic carbon-water partition coefficient
cm3/g
Chemical specific
foc
Organic carbon content of soil
g/g
0.002
Equation 6--Particulate Emission Factor (PEF)
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Parameter
Definition
Units
Default
PEF
Particulate emission factor
m3/kg
1.67 x 109(Residential) 1.64 x 109(Nonresidential)
Q/C
Inverse concentration at center of source
(g/m2-s)/(kg/m3)
86.6 (Residential) 85 (Nonresidential)
v
Percent vegetative cover
percent
50
Um
Mean annual wind speed
m/s
4.56
Ut
Equivalent threshold value of wind speed at 7 m
m/s
11.32
F(x)
Function dependent on Um/Ut derived using Cowherd et al. (1985)
unitless
0.159
Equation 7--Soil Saturation Limit (Csat)
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Parameter
Definition
Units
Default
Csat
Soil saturation limit
mg/kg
Chemical specific
S
Water solubility
mg/Lwater
Chemical specific
pb
Dry soil bulk density
g/cm3
1.5
Kd
Soil-water partition coefficient
cm3/g
Chemical specific
[THETA]w
Water-filled soil porosity
Lwater/Lsoil
0.23
H'
Henry's law constant
unitless
Chemical specific
[THETA]a
Air-filled soil porosity
Lair/Lsoil
0.18