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EnviroGroup Limited
Vapor Intrusion News - March 2005
In This Issue:
 *  New York State Department of Health Draft Vapor Intrusion Guidance Released
 *  Severn Trent Laboratories Vapor Intrusion Seminar Presentations
 *  New York State Assembly Hearing on Vapor Intrusion
 *  San Francisco Bay Regional Water Quality Control Board Updated Environmental Screening Levels


Featured Links:
 *  New York Draft VI Guidance
 *  STL Seminar Presentations
 *  New York Public Hearing Comments
 *  Updated Environmental Screening Levels
New York State Department of Health Draft Vapor Intrusion Guidance Released

In February the New York State Department of Health released a draft Guidance for Evaluating Soil Vapor Intrusion in the State of New York. The guidance does not include screening levels, but moves directly to a combination of sub-slab vapor, indoor air, and outdoor air testing in buildings overlying or near subsurface sources of volatile chemicals. The guidance does not permit No Further Action determinations based solely on soil vapor data or modeling. State guidelines for indoor air concentrations are presented for five contaminants including: PCE - 100 ug/m3 and TCE - 5 ug/m3; however, mitigation to background levels is the stated objective of the guidance. The document includes background levels for 35 contaminants from four data sources, including two New York State studies. Indoor occupational exposures are defined as resulting from current commercial or industrial processes within a building. Mitigation is based on a "decision matrix", which in turn is based on a combination of sub-slab vapor and indoor air concentrations. Generic decision matrices for TCE, PCE, and 1,1,1-TCA are presented for ranges of sub-slab vapor and indoor air concentrations of contaminants.

Comments on the document will be accepted until April 23, 2005. The guidance can be found at:


New York Draft VI Guidance



Severn Trent Laboratories Vapor Intrusion Seminar Presentations

In February Severn Trent held three one day vapor intrusion seminars: February 18, Denver, CO; February 22, San Pedro, CA; and February 24, Alamo, CA. Topics covered include attenuation factors, emerging chemicals of concern, background, modeling, soil vapor sampling, and California DTSC's vapor intrusion guidance. The presentations made at these presentations can be found at the following STL link:


STL Seminar Presentations



New York State Assembly Hearing on Vapor Intrusion

The New York State Assembly Committee on Environmental Conservation held a public hearing on vapor intrusion on November 15, 2004 in Endicott, NY. Many of the comments relate to protectiveness of the New York DOH TCE indoor air guideline of 5 mcg/m3. The complete report of that hearing, Vapor Intrusion of Contamination into Indoor Air, can be found at:



New York Public Hearing Comments



San Francisco Bay Regional Water Quality Control Board Updated Environmental Screening Levels

The San Francisco Bay Regional Water Quality Control Board updated its environmental screening levels in February 2005. Screening levels for soil and ground water for over 100 chemicals are included. Screening levels for shallow soil gas and indoor air for two land uses are presented in Table E. The updated document can be found at:


Updated Environmental Screening Levels




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 St., Suite 300, Centennial, CO 80112.

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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