Professor Peters: Thank you for your obvious investment of time and expertise....very much appreciated! I need your additional help to understand "non-traditional" (10-12hr sampling). My assumption is that after adjusting the OEL (PEL, TLV), via the Brief & Scala or the OSHA formula; one would simply modify the 8-hr TWA formula, substituting a 10hr or 600 minute sampling period with assumptions (as described: zero exposure; average exposure; worst case exposure) for non-sampled periods. Am I correct in my understanding? ...if not...could you please clarify? Also...considering that NIOSH REL's are based on a 10-hr work shift...am I correct in concluding that when applying a REL to a 10-hr shift; no adjustment is necessary. But...if sampling a standard 8-hr shift, the REL (10-hr) must be adjusted "downward" from 10-hr to 8-hr. Thank you in advance for your time to reply. Respectfully, -Bill
+William Coyle Glad you liked the video. You are correct in your understanding. Also, no adjustment would be needed for NIOSH REL's. I looked for information on adjusting downward and could not find anything. I recommend not adjusting the REL downward for a shorter time. Exposures are typically log-normally distributed, which means that sometimes various workplace and production factors come together to produce a small number of high exposures. Thus, I recommend taking action if exposures commonly exceed ~10% of the OEL. Tom
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Hi, this was fantastic. ACGIH is not a consensus group, and TLVs and BEIs are not consensus standards.
This lecture is highly appreciable. Thank you so much sir.
good work prof
Professor Peters: Thank you for your obvious investment of time and expertise....very much appreciated!
I need your additional help to understand "non-traditional" (10-12hr sampling).
My assumption is that after adjusting the OEL (PEL, TLV), via the Brief & Scala or the OSHA formula; one would simply modify the 8-hr TWA formula, substituting a 10hr or 600 minute sampling period with assumptions (as described: zero exposure; average exposure; worst case exposure) for non-sampled periods. Am I correct in my understanding? ...if not...could you please clarify? Also...considering that NIOSH REL's are based on a 10-hr work shift...am I correct in concluding that when applying a REL to a 10-hr shift; no adjustment is necessary. But...if sampling a standard 8-hr shift, the REL (10-hr) must be adjusted "downward" from 10-hr to 8-hr.
Thank you in advance for your time to reply.
Respectfully,
-Bill
+William Coyle
Glad you liked the video. You are correct in your understanding. Also, no adjustment would be needed for NIOSH REL's. I looked for information on adjusting downward and could not find anything. I recommend not adjusting the REL downward for a shorter time.
Exposures are typically log-normally distributed, which means that sometimes various workplace and production factors come together to produce a small number of high exposures. Thus, I recommend taking action if exposures commonly exceed ~10% of the OEL.
Tom