Draft screening levels for asbestos, fiberglass and silica in indoor air and settled dust.
NYC-WTC_000163599–000163605Folder label: “E-mails 2002 M. Gilsenan”
OCR status: ok · source: pdftotext
NYC 9/11 Public Portal Document
Gilsenan, Michael From: DeVoney, Danielle [[email protected]] Sent: Monday, April 01. 2002 1:48 PM To: DeVoney, Danielle; '[email protected]'; '[email protected]'; '[email protected]'; Rodenbeck, Sven; '[email protected]'; '[email protected]'; '[email protected]'; '[email protected]'; '[email protected]'; '[email protected]'; '[email protected]'; '[email protected]'; 'Randi J. Walker'; 'Patricia M. Fritz' Cc: '[email protected]'; '[email protected]'; '[email protected]'; Cooper, Barbara; Lee, Carolyn V. (Virginia); Neurath, Sue; Wilder, Lynn Subject: RE: draft screening levels for asbestos, FG and silica in indoor air and settled dust
-----ts,
AsbScreenDrlAprll. AsbCalcslAprll.xls wpd Hi
I ran some quick calculations for risk combining air and dust numbers, and integrated them into a screening level table. this assumes protecting for a 1/10,000 risk for one year for the upper tier, and the same for 30 years in the lower tier.
This is a first attempt on risk number, different exposure assumptions, and K values would yield slightly different results. I'm providing this as a basis for discussion. If we like the approach we can refine the risk calculations appropriately. Also, I've used a K factor of 1 x 10 -7 for "daily activity" although this works well with the math, we may want to refine that number also.
thanks, danielle
---- Original Message---- From: DeVoney, Danielle Sent: Monday, April 01, 2002 11:58 AM To: '[email protected]'; grevatt.peter@epamail .epa.gov; [email protected] ; Rodenbeck, Sven; [email protected]; [email protected]; DeVoney, Danielle; laposta.dore@epamail .epa.gov; [email protected]; [email protected]; nj [email protected]; [email protected] ; [email protected]; Randi J. Walker; Patricia M. Fritz Cc: [email protected]; [email protected]; [email protected] 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 1
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