N.J. Admin. Code 26D app 4

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

DEVELOPMENT OF THE SOIL AND SOIL LEACHATE REMEDIATION STANDARDS FOR THE MIGRATION TO GROUND WATER EXPOSURE PATHWAY

This appendix describes the procedures used by the Department to develop the soil and soil leachate remediation standards for the migration to ground water exposure pathway as contained at N.J.A.C. 7:26D Appendix 1, Tables 5 and 6. This appendix is also used to develop interim soil and soil leachate remediation standards for the migration to ground water exposure pathway pursuant to N.J.A.C. 7:26D-6 and for updating soil and soil leachate remediation standards for the migration to ground water exposure pathway pursuant to N.J.A.C. 7:26D-7.

If a calculated soil criterion for a contaminant for the migration to ground water exposure pathway is greater than its soil saturation limit, a soil remediation standard for the migration to ground water exposure pathway does not apply.

If a calculated soil criterion for a contaminant for migration to ground water exposure pathway is less than the soil reporting limit for that contaminant, the soil remediation standard for the migration to ground water remediation exposure pathway defaults to the soil reporting limit.

Equation 1a--Migration to Ground Water Soil-Water Partitioning Criteria for Inorganic Contaminants

Source: USEPA Soil Screening Guidance: Technical Background Document EPA/540/R-95/128 (May 1996) (Equation 22)

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Parameter Definition Units Default
MGWc Migration to ground water soil-water partitioning criterion mg/kg Chemical specific
GWRS Ground water remediation standard µg/L Chemical specific
Kd Soil-water partition coefficient L/kg Chemical specific
[THETA]w Water-filled soil porosity Lwater/Lsoil 0.23
[THETA]a Air-filled soil porosity Lair/Lsoil 0.18
H' Henry's law constant unitless Chemical specific
pb Dry soil bulk density kg/L 1.5
DAF Dilution-attenuation factor unitless 20

Equation 1b--Migration to Ground Water Soil-Water Partitioning Criteria for Organic Contaminants

Source: USEPA Soil Screening Guidance: Technical Background Document EPA/540/R-95/128 (May 1996) (Equation 24)

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Parameter Definition Units Default
MGWc Migration to ground water soil-water partitioning criterion mg/kg Chemical specific
GWRS Ground water remediation standard µg/L Chemical specific
Koc Soil organic carbon-water partition coefficient L/kg Chemical specific
foc Organic carbon content of soil kg/kg 0.002
[THETA]w Water-filled soil porosity Lwater/Lsoil 0.23
[THETA]a Air-filled soil porosity Lair/Lsoil 0.18
H' Henry's law constant unitless Chemical specific
pb Dry soil bulk density kg/L 1.5
DAF Dilution-attenuation factor unitless 20

Equation 2--Dilution-Attenuation Factor

Source: USEPA Soil Screening Guidance: Technical Background Document EPA/540/R-95/128 (May 1996) (Equation 37)

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Parameter Definition Units Default
DAF Dilution-attenuation factor unitless 20
K Aquifer hydraulic conductivity m/year 15,808
i Hydraulic gradient m/m 0.003
d Mixing zone depth m 3.4
I Infiltration rate m/year 0.28
L Length of area of concern parallel to ground water flow m 30.5

Equation 3--Mixing Zone Depth

Source: USEPA Soil Screening Guidance: Technical Background Document EPA/540/R-95/128 (May 1996) (Equation 45)

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Parameter Definition Units Default
d Mixing zone depth m 3.4
L Length of area of concern parallel to ground water flow m 30.5
da Aquifer thickness m 3.5
I Infiltration rate m/year 0.28
K Aquifer hydraulic conductivity m/year 15,808
i Hydraulic gradient m/m 0.003

Equation 4--Soil Saturation Limit

Source: USEPA Soil Screening Guidance: Technical Background Document EPA/540/R-95/128 (May 1996) (Equation 9)

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Parameter Definition Units Default
Csat Soil saturation limit mg/kg Chemical specific
S Water solubility mg/L Chemical specific
pb Dry soil bulk density kg/L 1.5
Koc Soil organic carbon-water partition coefficient L/kg Chemical specific
foc Organic carbon content of soil kg/kg 0.002
[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

Equation 5--Soil Leachate Remediation Standards for the Migration to Ground Water Exposure Pathway

Source: USEPA Soil Screening Guidance: Technical Background Document EPA/540/R-95/128 (May 1996) (Target soil leachate concentration parameter in Equations 22 and 24)

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Parameter Definition Units Default
MGWleachate Soil leachate remediation standard for the migration to ground water exposure pathway µg/L Chemical specific
GWRS Ground water remediation standard µg/L Chemical specific
DAF Dilution-attenuation factor unitless 20

Notes

N.J. Admin. Code 26D app 4
Amended by R.2012 d.095, effective 5/7/2012.
See: 43 N.J.R. 1935(a), 44 N.J.R. 1339(b).
In the last paragraph of Option I of B, updated the N.J.A.C. reference.
Adopted by 53 N.J.R. 775(b), effective 5/17/2021

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