N.J. Admin. Code 26D app 2

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

DEVELOPMENT OF SOIL REMEDIATION STANDARDS FOR THE INGESTION-DERMAL EXPOSURE PATHWAY

This appendix describes the procedures and equations used by the Department to develop the soil remediation standards for the ingestion-dermal exposure pathway as contained in N.J.A.C. 7:26D Appendix 1 Tables 1 and 2. This appendix is also used to develop interim soil remediation standards for the ingestion-dermal exposure pathway pursuant to N.J.A.C. 7:26D-6 and for updating soil remediation standards for the ingestion-dermal exposure pathway pursuant to N.J.A.C. 7:26D-7.

If the calculated soil criterion for a contaminant for the ingestion-dermal exposure pathway is greater than one million mg/kg, a soil remediation standard for the ingestion-dermal exposure pathway for that contaminant does not apply.

If the calculated soil criterion for a contaminant for the ingestion-dermal exposure pathway is less than the reporting limit for that contaminant, the soil remediation standard for the ingestion-dermal exposure pathway for that contaminant defaults to the soil reporting limit.

Equations 1 through 4 below are derived from the USEPA, Regional Screening Levels (RSLs)--Equations (November 2018). A detailed explanation of the derivation of Equations 1 through 4 is contained at N.J.A.C. 7:26D Appendix 12.

Equation 1--Residential Carcinogenic Ingestion-Dermal Human Health-Based Criteria

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Parameter Definition Units Default
IDc Carcinogenic ingestion-dermal 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
CSFo Oral cancer slope factor (mg/kg-day)- 1 Chemical specific
IFSadj Age-adjusted soil ingestion rate mg/kg 36,750
CSFD Dermal cancer slope factor (mg/kg-day)- 1 Chemical specific
DFSadj Age-adjusted soil dermal contact factor mg/kg 103,390
ABSd Dermal absorption fraction unitless Chemical specific

Where:

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Parameter Definition Units Default
IFSadj Age-adjusted soil ingestion rate mg/kg 36,750
EFc Exposure frequency-child days/year 350
EFa Exposure frequency-adult days/year 350
EDc Exposure duration-child years 6
EDa Exposure duration-adult years 20
IRc Soil ingestion rate-child mg/day 200
IRa Soil ingestion rate-adult mg/day 100
BWc Body weight-child kg 15
BWa Body weight-adult kg 80

Where:

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Parameter Definition Units Default
DFSadj Age-adjusted soil dermal contact factor mg/kg 103,390
EFc Exposure frequency-child days/year 350
EFa Exposure frequency-adult days/year 350
EDc Exposure duration-child years 6
EDa Exposure duration-adult years 20
SAc Skin surface area-child cm2/day 2,373
SAa Skin surface area-adult cm2/day 6,032
AFc Soil adherence factor-child mg/cm2 0.2
AFa Soil adherence factor-adult mg/cm2 0.07
BWc Body weight-child kg 15
BWa Body weight-adult kg 80

Where:

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Parameter Definition Units Default
CSFD Dermal cancer slope factor (mg/kg-day)-1 Chemical specific
CSFO Oral cancer slope factor (mg/kg-day)-1 Chemical specific
GIABS Gastro-intestinal absorption fraction unitless Chemical specific

Equation 2--Residential Noncarcinogenic Ingestion-Dermal Human Health-Based Criteria

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Parameter Definition Units Default
IDnc Noncarcinogenic ingestion-dermal human health-based criterion mg/kg Chemical specific
THQ Target hazard quotient unitless 1
AT Averaging time days/year 365
ED Exposure duration years 6
BW Body weight-child kg 15
EF Exposure frequency days/year 350
RfDO Oral reference dose mg/kg-day Chemical specific
IR Soil ingestion rate-child mg/day 200
RfDD Dermal reference dose mg/kg-day Chemical specific
SA Skin surface area-child cm2/day 2,373
AF Soil adherence factor-child mg/cm2 0.2
ABSd Dermal absorption fraction unitless Chemical specific

Where:

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Parameter Definition Units Default
RfDD Dermal reference dose mg/kg-day Chemical specific
RfDO Oral reference dose mg/kg-day Chemical specific
GIABS Gastro-intestinal absorption fraction unitless Chemical specific

Equation 3--Nonresidential Carcinogenic Ingestion-Dermal Human Health-Based Criteria

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Parameter Definition Units Default
IDc Carcinogenic ingestion-dermal 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
BW Body weight - adult kg 80
EF Exposure frequency-outdoor worker days/year 225
ED Exposure duration years 25
CSFo Oral cancer slope factor (mg/kg-day)-1 Chemical specific
IR Soil ingestion rate-outdoor worker mg/day 100
CSFD Dermal cancer slope factor (mg/kg-day)-1 Chemical specific
SA Skin surface area-worker cm2/day 3,527
AF Soil adherence factor-worker mg/cm2 0.12
ABSd Dermal absorption fraction unitless Chemical specific

Where:

Click here to view image

Parameter Definition Units Default
CSFD Dermal cancer slope factor (mg/kg-day)-1 Chemical specific
CSFO Oral cancer slope factor (mg/kg-day)-1 Chemical specific
GIABS Gastro-intestinal absorption fraction unitless Chemical specific

Equation 4--Nonresidential Noncarcinogenic Ingestion-Dermal Human Health-Based Criteria

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Parameter Definition Units Default
IDnc Noncarcinogenic ingestion-dermal human health-based criterion mg/kg Chemical specific
THQ Target hazard quotient unitless 1
AT Averaging time days/year 365
ED Exposure duration years 25
BW Body weight-adult kg 80
EF Exposure frequency- outdoor worker days/year 225
RfDO Oral reference dose mg/kg-day Chemical specific
IR Soil ingestion rate- outdoor worker mg/day 100
RfDD Dermal reference dose mg/kg-day Chemical specific Chemical specific
SA Skin surface area- worker cm2/day 3,527
AF Soil adherence factor-worker mg/cm2 0.12
ABSd Dermal absorption fraction unitless Chemical specific

Where:

Click here to view image

Parameter Definition Units Default
RfDD Dermal reference dose mg/kg-day Chemical specific
RfDO Oral reference dose mg/kg-day Chemical specific
GIABS Gastro-intestinal absorption fraction unitless Chemical specific

Equation 5--Residential and Nonresidential Noncarcinogenic Ingestion-Dermal Human Health-Based Criteria for EPH

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Parameter Definition Units Default
IDnc Noncarcinogenic soil criterion for the ingestion-dermal exposure pathway mg/kg Chemical specific
THQ Target hazard quotient unitless 1
f' Equivalent carbon weight fraction unitless Chemical specific
ECFV Equivalent carbon fraction value mg/kg Chemical specific

IDnc is the noncarcinogenic soil criterion for the ingestion-dermal exposure pathway for total EPH for the

EPH composition established by the eight equivalent carbon (EC) range fractions. This equation was used to calculate a single numeric total EPH soil criterion for EPH (Category 1). This equation will be used to calculate a sample-specific total EPH soil criterion for all EPH (Category 2) using the Department's online EPH Calculator.

The equivalent carbon fraction value (ECFV) equation and default input variables are the same as used to calculate the noncarcinogenic soil criteria for the specific individual contaminants for the ingestion-dermal absorption exposure pathway shown in Equations 2 and 4. That is, each EC range is treated as if it is a single contaminant.

Notes

N.J. Admin. Code 26D app 2
Adopted by 53 N.J.R. 775(b), effective 5/17/2021

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