Draft memo forwarding thread, April 2002

NYC 9/11 Public Portal Document

04/03/02 DRAFT: not for public release _________ Ambient and Indoor Sampling for Public Health Evaluations of Residential Area^ Near World Trade Center, New York, New York (November 4 - December^HjJMI) Results were compared to dust and air levels found in homes located in "non-impacted" areas_ and to indoor asbestos standards. At each sampled building, atternpts were made to sample in a common area, two residences, and an adjacent outdoor location.

Dust: I; If PLM was less than 1%*, confirmation by TEM was performed. If TEM was less than 1%, no further action was taken. : .. J -. ! 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. ' i I I J ___ t___ 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. ._i 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. . . 1 1 - i - - -i - • A material is considered to be asbestos-containing material 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-impacted areas. *** Asbestos clearance criteria. Rules of the City of New York, Trtle 15, Chapter 1.

Results for Asbestos in Air and Settled Dust

Building Asbestos In Asbestos in ' ' Asbestos In k* L Location Fibers in Air Number Dust Dust -4 Residential Buildings in Lower Manhattan I- b --4

Building 1 4.u. - -- 4 -- PLM [%] 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 I Not Sampled 0.006 <.001 TRes2 rRes2 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.

- -4----- 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 Res 1 ND Not Sampled <.001 NA 2 Res 2 ND Not Sampled 0.002 NA 2 Window Sill <1 <1 NA NA 2 Outside X 1.3 NA Not Sampled NA -i Building 2 Notes: DEP 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. 4 There was not enough material left to analyze the indoor dust samples by TEM. I -- I Building 3 i - - - , 1 PLM [%] TEM[%] , PCM [f/cc] ' TEM [f/cc] ' 3 Outside Not Sampled Not Sampled i <.001 NA

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