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)
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