Benchmarks - indoor contaminants of concern, Apr 2002

NYC 9/11 Public Portal Document

Gilsenan, Michael From: Rodenbeck, Sven [[email protected]] Sent: Monday, March 25, 2002 12:54 PM To: '[email protected]'; [email protected]: [email protected]; Rodenbeck, Sven; [email protected] ; [email protected]: DeVoney, Danielle; [email protected] : [email protected]: [email protected]; [email protected] Subject: RE: Strawman benchmarks for a couple of probable indoor COCs

Final WTC Asbestos Action Leve... Hello Everyone!! Attached below is the Asbestos Action Levels developed by the DHHS, EPA, OSHA Environmental Assessment Working Group. This Action Levels were approved by all agencies that participate on the Working Group. Therefore, I would propose that we use them for asbestos in air. Sven

---- Original Message---- From: Maddaloni.Markgepamail.epa.gov [mailto:Maddaloni.Markgepamail.epa.gov] Sent: Monday, March 25, 2002 11:29 AM To: grevatt.petergepamail.epa.gov; smith.terrygepamail.epa.gov; svrlgcdc.gov; rlc07ghealth.state.ny.us; kcarlinoghealth.nyc.gov; dld7gcdc.gov; laposta.doregepamail.epa.gov; david.ippolitogosha.gov; dan.cranegosha.gov; nj efferyghealth.nyc.gov Subject: Strawman benchmarks for a couple of probable indoor COCs

I was hoping to have a more formalized package to distribute this morning, but this somewhat crude approach will have to suffice. Listed below is the paradigm and I've taken a shot a filling in asbestos and lead for both settled dust and indoor air. Enjoy.

I I Tier I Screening Value Action I I I > E-04 (1 yr) or HQ = 10 aggressive cleaning I (professional?) - if I readings persist take I additional action to reduce I exposure I I II background or E-04 (30 maintain recommended (i.e., I yr)/HQ =1 to E-04 (1 yr)/HQ diligent wet/HEPA) cleaning I = 10 methods - consider I additional monitoring I I III I < background or E-04 (30 no further action I I yr)/HQ = 1 I +---------------------- +

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NYC-WTC_000163607