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EnviroGroup Limited   Vapor Intrusion News - Feb 2005  
In This Issue:
   New York DEC Establishes Policy for Evaluating Vapor Intrusion
   California DTSC Issues Vapor Intrusion Guidance
   California EPA Issues Screening Levels
   TCE Fact Sheet
   New York Brownfields Web Site
   EPA Vapor Intrusion Workshop
   STL Vapor Intrusion Seminars



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New York DEC Establishes Policy for Evaluating Vapor Intrusion

On November 22, 2005 the New York Department of Environmental Conservation issued for comment a draft policy titled: "Evaluating the Potential for Vapor Intrusion at Past, Current, and Future Sites". The comment period ended January 24, 2005. The policy covers RCRA corrective action sites, State superfund sites, voluntary cleanup program sites, brownfield cleanup program sites, environmental restoration program sites, and petroleum spill sites. Of particular interest is the proposed screening of pre-2003 sites where remedial decisions have already been made. That universe of sites will be prioritized throughout the state and assessed for vapor intrusion potential over time. The draft policy can be found at:
 
NYDEC Vapor Intrusion Policy

California DTSC Issues Vapor Intrusion Guidance

On January 5, 2005 the California Department of Toxic Substances released an interim final "Guidance for the Evaluation and Mitigation of Subsurface Vapor Intrusion to Indoor Air". The 105 page document lays out a detailed step wise approach to performing these evaluations. Steps included in the evaluation include; screening evaluations using soil gas data and attenuation factors for the building construction type, possible additional site data collection including soil parameters and sub lab and crawl space sampling, site specific modeling, and indoor air sampling as a final step. The guidance covers sites with and without current buildings. OSHA PELS are not allowed to be used in screening exposures in occupational settings except possibly for operating RCRA facilities for environmental indicator purposes. Twelve appendices are included and the public comment period ends August 15, 2005. The document can be found at:

CA DTSC Vapor Intrusion Guidance

California EPA Issues Screening Levels

The Office of Health Hazard Assessment of the California EPA issued in January 2005 the document "Use of California Human Health Screening Levels (CHHSLs) in Evaluation of Contaminated Properties". Table 1 contains soil screening levels for 44 chemicals and two land uses. Table 2 contains screening levels for 17 chemicals for soil gas protective of vapor intrusion and indoor air for two land uses. The document uses California specific toxicity factors in calculating these screening levels. It can be found at:

CAL EPA Screening Levels


TCE Fact Sheet

A fact sheet on Trichloroethylene Inhalation Toxicity Values and Corresponding Risk Based Indoor Air Concentrations has been prepared by EPA Region VIII. It provides an explanation of the EPA "old withdrawn" and "new provisional" TCE inhalation toxicity values. It also presents the December 2002 California EPA TCE cancer slope factor and the interim TCE guidance developed by the Colorado Department of Public Health and Environment. An included table provides the indoor air TCE concentrations for all of these toxicity values based on both 10-4 and 10-6 risk. Courtesy of Helen Dawson, EPA Region VIII, this fact sheet can be found at:

EPA Region 8 TCE Fact Sheet

New York Brownfields Web Site

A New York specific brownfields web site is maintained by the Newman Development Group and can be found at the link below. The web site includes a copy of the working draft of the New York State Department of Health "Guidance for Evaluating Soil Vapor Intrusion in the State of New York". The Emerging Issue: Vapor Intrusion section of the site includes testimony provided by a number of individuals at the hearing on "Vaporization of Contamination from Soil and Groundwater into Indoor Air" held by the New York State Assembly Standing Committee on Environmental Conservation in Endicott, NY on November 15, 2004. It also includes a number of other New York State Department of Health guidance documents relative to vapor intrusion.

Link to New York Brownfields Web Site

EPA Vapor Intrusion Workshop

IEPA will hold a workshop on Integrating Observed and Modeled Vapor Attenuation on March 14, 2005 in San Diego, CA in conjunction with the AEHS 15th Annual West Coast Conference on Soil, Sediment, and Water. It will include invited presentations and a session designed to allow for input and comment on the EPA VI guidance. The conference also includes a four hour session March 15 on vapor intrusion. The conference agenda and registration information are available at:

AEHS Conference Agenda and Registration

STL Vapor Intrusion Seminars

Severn Trent Laboratories is holding three free seminars titled "Technical Guidance for Indoor Air Vapor Intrusion" at the following dates and locations:

February 15, 2005 - Denver, CO
February 22, 2005 - San Pedro, CA
February 24, 2005 - Alamo, CA

Topics to be covered include State and EPA guidance, vapor intrusion modeling, background sources, laboratory methods, and lessons learned. Robbie Ettinger of J&E Model fame, Henry Schuver of EPA, and Dr. David Berry of DTSC will speak at the California seminars, and Dave Folkes and Dr. Jeff Kurtz of Envirogroup Limited will speak at the California and Colorado seminars, respectively, on the use of various lines of evidence to distinguish background from vapor intrusion sources. Specific agendas for these seminars and registration procedures can be found at:

STL VI Seminar Registration
 

Link to Background Papers

 

This newsletter is issued periodically to provide our readers with information on new regulatory and technical developments in the rapidly changing field of vapor intrusion. While every effort is made to ensure that the information and links presented in this newsletter are accurate at the time of publication, they are presented for general information purposes only. Users should independently verify the accuracy and applicability of this information and seek professional advice for any specific sites or purposes. Articles on or links to any document or website do not imply endorsement of that document or website by EnviroGroup. Copyright EnviroGroup Limited 2003. 7009 S Potomac Street, Centennial, CO 80112. Telephone (303) 790-1340.

Please contact us if you have any questions about the topics presented in this newsletter, or vapor intrusion in general. More information about EnviroGroup Limited, including several useful links to vapor intrusion websites, is available at:  EnviroGroup Limited - Vapor Intrusion Solutions
5670 Greenwood Plaza Blvd, Suite 540 | Greenwood Village, CO 80111 | 303-790-1340
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