In This Issue:
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New York DEC Establishes Policy for
Evaluating Vapor Intrusion |
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California DTSC Issues Vapor Intrusion
Guidance |
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California EPA Issues Screening Levels |
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TCE Fact Sheet |
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New York Brownfields Web Site |
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EPA Vapor Intrusion Workshop |
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STL Vapor Intrusion Seminars |
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Featured Links:
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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:
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:
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:
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:
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.
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:
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
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