DEP memo forwarding EPA draft screening level calculations for asbestos, fiberglass, and silica in indoor air and settled dust for review.
NYC-WTC_000139634–000139637Folder label: “E-Mails Sent M. Gilsenan 2001-2002”
OCR status: ok · source: pdftotext
NYC 9/11 Public Portal Document
[email protected]; DeVoney, Danielle; laposta.doreSepamail.epa.gov; david.ippolitoSosha.gov; dan.craneSosha.gov; njefferyShealth.nyc.gov; [email protected]; [email protected] ; Randi J. Walker; Patricia W. Fritz Cc: Callahan.Kathygepamail.epa.gov; Salkie.Richardgepamail.epa.gov; Rotola.JoeSepamail.epa.gov Subject: draft screening levels for asbestos, FG and silica in indoor air and settled dust Importance: High
Hi
Main points of discussion on these issues for today's call are outlined below. I've tried to identify the main technical issues, so we can reach consensus, or identify additional information we need to consider on each point. I have included tiered screening values for fibrous glass which take into consideration both dust and air levels. There are two versions of these screening levels which take different approaches as outlined below. I thought this would be useful for the discussion.
1) Sampling methodology for fibers. The microvac technique seems to be the most well developed method. It is a written and approved ASTW method which would give us surface loading information.
2) Use of K factors, or other techniques to extrapolate from settled dust to air screening values. Questions:
a) Does the group feel Willette's K factors are well enough supported to apply in this case?
b) What other options exist? (see "Dust Ideas 1 April.wpd" below)
c) Can K factors be applied to non-fibrous dust components?
3) What risk estimate should be used for asbestos screening values?
A straight 1 year continuous exposure scenario gives a screening values of 0.028 f/cc. However, if this is based on sampling during daily activity, it may underestimate due to episodic higher exposures.
Earlier screening level for this tier was set at 0.01 f/cc.
One option would be to use non-aggressive air sampling in conjunction with settled dust levels and modeling of activity based episodic exposures for a combined risk assessment.
4) Sampling methodology and screening values for silica. We are still working on determining a dust sampling method for silica. The sampling method should be defined prior to determining a screening value for these data.
2
NYC-WTC_000139635
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