New Jersey Administrative Code › Title 7 - ENVIRONMENTAL PROTECTION › Chapter 26D - REMEDIATION STANDARDS › Appendix 4

Current through Register Vol. 56, No. 14, July 15, 2024
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