Gary,

A few years ago I assisted Larry McLouth, CIH, of Lawrence Berkeley
National Lab in completing a paper entitled "Controlling mercury spills
in laboratories with a thermometer exchange program" published in the
September/October 2002 issue of the ACS publication "Chemical Health and
Safety".  This article contains information about selecting a clearance
limit, which was accepted at 0.003 mg/m3 for an occupied space.

Steve Leland, CIH
Environmental Health & Safety
CSU, Sacramento
(916) 278-5447


-----Original Message-----
From: Gary M. Kehoe [mailto:gkehoe**At_Symbol_Here**mwgen.com]
Sent: Monday, March 07, 2005 7:18 AM
To: aihaih-list**At_Symbol_Here**yahooGroups.com; ih**At_Symbol_Here**ls.eei.org; DCHAS-L**At_Symbol_Here**LIST.UVM.EDU
Subject: [aihaih-list] Mercury Spill Clean up

I am in the process of reviewing and updating our mercury spill
procedure.
 In taking to a hazmat responder they referenced a "surface" standard of

3000 nanograms/cubic meter as a clearance level after a spill clean up.
The person I was speaking with could not adequately explain the
rationale
for the "standard" nor could they tell me what organization published
the
standard other than that it was one they used when working with a local
utility.  They also indicated that breathing zone levels were generally
well within the TLV even when the surface contamination was higher than
3000 ng/M3.  They are measuring the surface with a direct reading meter.

Is anyone aware of this "standard" (or any others)?  What are your
thoughts on the "standard"?  What do you use?

Thanks,

Gary M. Kehoe, CIH
Senior Industrial Hygienist
Midwest Generation EME LLC
312-583-6103
312-925-1813 (C)
312-788-5533 (F)

[Non-text portions of this message have been removed]


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