N.J. Admin. Code 26D app 5

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

DEVELOPMENT OF INDOOR AIR REMEDIATION STANDARDS FOR THE VAPOR INTRUSION EXPOSURE PATHWAY

This appendix describes the procedures and equations used by the Department to develop the indoor air remediation standards for the vapor intrusion exposure pathway as contained at N.J.A.C. 7:26D Appendix 1, Tables 7 and 8. This appendix is also used to develop interim indoor air remediation standards for the vapor intrusion exposure pathway pursuant to N.J.A.C. 7:26D-6 and for updating indoor air remediation standards for the vapor intrusion exposure pathway pursuant to N.J.A.C. 7:26D-7.

If the calculated indoor air human health-based criterion for a contaminant is less than the reporting limit, the indoor air remediation standard defaults to the reporting limit.

Equations 1 and 2 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 Indoor Air Human Health-Based Criteria

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Parameter Definition Units Default
IAc Carcinogenic indoor air human healthbased criterion µg/m3 Chemical specific
TR Target cancer risk unitless 1 x 10-6
AT Averaging time days/year 365
LT Lifetime years 70
EF Exposure frequency days/year 350 (Residential) 250 (Nonresidential-indoor worker)
ED Exposure duration years 26 (Residential) 25 (Nonresidential)
ET Exposure time hours/day 24 (Residential) 8 (Nonresidential)
IUR Inhalation unit risk (µg/m3)-1 Chemical specific

Equation 2--Noncarcinogenic Indoor Air Human Health-Based Criteria

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Parameter Definition Units Default
IAnc Noncarcinogenic indoor air human healthbased criterion µg/m3 Chemical specific
THQ Target hazard quotient unitless 1
AT Averaging time days/year 365
ED Exposure duration years 26 (Residential) 25 (Nonresidential)
EF Exposure frequency days/year 350 (Residential) 250 (Nonresidential-indoor worker)
ET Exposure time hours/day 24 (Residential) 8 (Nonresidential)
RfC Inhalation reference concentration mg/m3 Chemical specific

Notes

N.J. Admin. Code 26D app 5
Special amendment, R.2009 d.361, effective 11/4/2009 (to expire May 4, 2011).
See: 41 N.J.R. 4467(a).
In 1i(4) of Part B, Option I, inserted "when the depth range of contamination begins at the ground surface", and inserted the last sentence.
Readoption of special amendment, R.2011 d.251, effective 9/8/2011.
See: 43 N.J.R. 1077(a), 43 N.J.R. 2581(b).
Provisions of R.2009 d.361 readopted without change.
Amended by R.2012 d.095, effective 5/7/2012.
See: 43 N.J.R. 1935(a), 44 N.J.R. 1339(b).
In 1i(4) and 1i(7) of Option I and in 1i(4) of Option II of B, updated the N.J.A.C. references.
Adopted by 53 N.J.R. 775(b), effective 5/17/2021

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