NYC-WTC_000229728

NYC 9/11 Public Portal Document

104 East 25tn Street New York. New York 10010

.1 associates INC WWW etc- envirc com 211 363.8280 Fax 212.353 8306

September 27, 2001

ALC Environmental 115 w. 30th Street New York, NY 10001 Attn: Mr. Joshua Sarett

Re; Report of TEM Analysis

Dear Mr. Sarett;

Following are the results of transmission electron microscopy (TEM) analysis of nineteen PCM air samples from our Group No. 5571;

Client; Mid-State Project Name: 395 Southend Avenue, Plaza 600 Location; Various Floors Samples received in TEM Lab: 09/26/01

These results will confirm and document the data transmitted to you today. The analyses were performed in strict conformance with the methodology of the NIOSH method 7402, Issue 2, August 15, 1994.

Forty grid openings from each of the samples were examined at relatively low magnifications (approximately l,000X and 10,000X) for structures greater than Sum in length and widths between Q.25um and 3um, and having a length-to-width ratio greater than 3.-1. These structures would be large enough to be observed by PCM analysis. Asbestos and non-asbestos structures were detected in the samples in the following proportions;

sample chrysotile gypsum cellulose F/CC as number Asbestos

1 0.0% 83.8% 16.2% 0.0 2 0.0% 56.3% 43.7% 0,0 3 0.0% 71.4% 28.6% 0.0 5 0.0% 64.3% 35.7% 0.0 6 0.0% 100.0% 0.0% 0.0 18.5% 25.9% 55.6% 0.002 i/ 9 0.0% 68.9% 31.1% 0.0 9.4% 90.6% 0.0% 0.003 13 0.0% 23.3% 76.7% 0.0 14 0.0% 70.0% 30.0% 0.0 15 0.0% 100.0% 0.0% 0.0 16 0.0% 100.0% 0.0% 0.0 17 0.0% 100.0% 0.0% 0.0 18 0.0% 100.0% 0.0% 0.0

CONFIDENTIAL, CITY_21MC100_003384980 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000229728