Re: Osha levels for TCE

[Lenny Siegel <lsiegel@cpeo.org>]

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As I understand it, the occupational-safety exposure levels for TCE are
based upon acute toxicity. 

In Mountain View, where we've focused on long-term exposures (chronic
toxicity),  U.S. EPA's provisional screening level for TCE in an
occupational scenario, based upon a one-in-a-million excess lifetime
(30-year) cancer risk, is .048 micrograms per cubic meter.

That's based upon EPA's recent draft (peer reviewed but unpromulgated)
toxicity asssessment. Before that, the most protective standard was the
state of California's, which equated .96 micrograms per cubic meter to
the one-in-a-million excess lifetime (30-year) cancer risk.

Lenny
-- 


Lenny Siegel
Director, Center for Public Environmental Oversight
c/o PSC, 278-A Hope St., Mountain View, CA 94041
Voice: 650/961-8918 or 650/969-1545
Fax: 650/961-8918
<lsiegel@cpeo.org>
http://www.cpeo.org

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