Supplemental Vapor Intrusion Information

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Supplemental Vapor Intrusion Information

Supplemental Information about the Updated Vapor Intrusion Screening Levels Now Available on the Site Remediation Program’s Website

This message serves as a follow up to the New Jersey Department of Environmental Protection’s (NJDEP’s) January 17, 2013 listserv regarding the updated vapor intrusion (VI) screening levels and revised technical guidance on the Site Remediation Program’s (SRP’s) web page, available here.

The SRP has posted new VI sampling results template letters and tables on its website to replace the template letters and tables that were provided in 2011. These template letters and tables are available here.

The new template tables feature the updated VI screening levels. There no longer are references to Rapid Action Levels (RALs) in either the template tables or letters in order to simplify the reporting of VI sampling results to property owners and/or occupants.

In addition, for your convenience, the SRP has posted tables comparing the old and new VI screening levels.  If you have any questions about how to use the new screening levels, please refer to the Implementation Strategy that can be found here.

Analysis of Naphthalene and 2-Methylnaphthalene for Vapor Intrusion Samples

The NJDEP is currently evaluating provisions of N.J.A.C. 7:26E-2.1(c)3 and the Vapor Intrusion Technical Guidance (Version 3) as it relates to the analysis of naphthalene and 2-methylnaphthalene for VI samples.  As detailed in the NJDEP guidance document “Department Implementation Strategy for Revised VI Screening Levels” (available here), the Department does not require the analysis of naphthalene and 2-methylnaphthalene as part of a VI investigation over the next five (5) months.

Based on a continuing review of scientific information, the NJDEP is modifying two existing provisions as follows:

  1. The analysis for 2-methylnaphthalene will not be required for VI samples collected during the investigation of kerosene, jet fuel, diesel fuel, fuel oil No. 2, and heavier petroleum products. The NJDEP intends to update the Technical Requirements for Site Remediation to remove the requirement to analyze VI samples for 2-methylnaphthalene.  Until the rule is updated, persons responsible can apply a variance pursuant to N.J.A.C. 7:26E-1.7 to not perform this analysis.  The NJDEP will update other posted web documents by the end of this week to reflect this change.
  2. In addition to Method TO-17, the NJDEP is developing provisions for analyzing naphthalene using either Method TO-15 or Low Level TO-15.  The announcement on the revised methodology should be released next month.  Starting on July 16, 2013, sampling and analysis for naphthalene, consistent with N.J.A.C. 7:26E-2.1(c)3, will be required. The modified TO-15 methodologies should be available at that time.


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