Chain of Custody Form Instructions for WTC Building Sampling

NYC 9/11 Public Portal Document

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____________________________________ 04/03/02 DRAFT: not for public release __________ ______________________ ______________

Ambient and Indoor Sampling for Public Health Evaluations of Residential Areas Near World Trade Center, New York, New York (November 4 - December 11, 2001) Resuits were compared to dust and air leveis found in homes iocated in "non-impacted" areas and to indoor asbestos standards. At each sampied building, attempts were made to sampie in a common area, two residences, and an adjacent outdoor location.

Dust- If PLM was less than 1%*, confirmation by TEM was performed.________________________________ ____________ If TEM was less than 1%, no further action was taken.______________________________ If TEM was greater than 1%, further action was taken._____________________________ If PLM was greater than 1%, confirmation by TEM was unnecessary and further action was taken.

Air: If PCM was less than 0.003** f/cc, no further action was taken._____________________________________ If PCM was greater than 0.003 f/cc, confirmation by TEM was performed._____________________________ ____________ If TEM was less than 0.01 f/cc, no further action was taken.______________________________ ____________ If TEM was greater than 0.01 f/cc (did not occur), further action would have been needed. If PCM Is greater than 0.01*** f/cc, confirmation by TEM was performed.

* A material is considered to be asbestos- wntsininQ rial If It contains more than 1% asbestos using the PLM method. When asbestos was detected, only Chrysotile asbestos was found. ** 0.003 is the upper range (0.001 - 0.003) of background Indoor air fiber concentrations determined in non-Impaeted areas. **♦ Asbestos clearance criteria. Rules of the City of New York. Title 15, Chapter 1.

Results for Asbestos in Air and Settled Dust

Building Asbestos in Asbestos In Location Fibers In Air Number Dust Dust Asbestos In Air

Residential Buildings In Lower Manhattan

Building 1 PLM [%1 TEM [%] PCM [f/cc] TEM [f/cc] 1 Outside ND Not Sampled 0.001 NA 1 Common Not Sampled Not Sampled <.001 NA 1 Rest ND Not Sampled 0.006 <.001 1 Res 2 ND Not Sampled <.001 NA Building 1 Notes: PCM results at Res 1 exceeded 0.003 f/cc. Asbestos fibers were not detected In this sample by TEM analysis. There was not enough material left to analyze the outdoor and residential dust samples by TEM.

Building 2 PLM [%] TEM [%] PCM [f/cc] TEM [f/cc] 2 Outside <1 1.2 0.003 NA 2 Common ND Not Sampled 0.005 <.001 2 Rest ND Not Sampled <.001 NA 2 Res 2 ND Not Sampled 0.002 NA 2 Window sni <1 <1 NA NA 2 Outside X 1.3 NA Not Sampled NA Building 2 Notes: PEP Inspected and found asbestos-containing material In the outdoor location which was then professionally abated. ____ PCM results exceeded 0.003 f/cc In the common area. Asbestos fibers were not detected in this sample by TEM analysis. There was not enough material left to analyze the indoor dust samples by TEM._________________________________

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