New Jersey Administrative Code › Title 7 - ENVIRONMENTAL PROTECTION › Chapter 26D - REMEDIATION STANDARDS › Appendix 2

Current through Register Vol. 56, No. 14, July 15, 2024
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
Click here to view image
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:
Click here to view image
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:
Click here to view image
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:
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 2--Residential Noncarcinogenic Ingestion-Dermal Human Health-Based Criteria
Click here to view image
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:
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 3--Nonresidential Carcinogenic Ingestion-Dermal Human Health-Based Criteria
Click here to view image
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
Click here to view image
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
Click here to view image
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.