N.J. Admin. Code 26D app 3

Current through Register Vol. 54, No. 7, April 4, 2022

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

Notes

N.J. Admin. Code 26D app 3
Adopted by 53 N.J.R. 775(b), effective 5/17/2021

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