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Vapor
Intrusion News - March 2005 |
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In
This Issue:
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New
York State Department of Health Draft Vapor Intrusion Guidance Released |
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Severn
Trent Laboratories Vapor Intrusion Seminar Presentations |
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New
York State Assembly Hearing on Vapor Intrusion |
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San
Francisco Bay Regional Water Quality Control Board Updated
Environmental Screening Levels |
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Featured
Links:
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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In February the New York State Department of Health released a draft
Guidance for Evaluating Soil Vapor Intrusion in the State of New York.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:
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:
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:
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:
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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: |
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