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Chain of custody form for air monitoring, 385 South End

Machine-extracted title · confidence 95%

Chain of custody documentation for bulk sampling and air monitoring at 385 South End Avenue Building 500.

NYC-WTC_000117668–000117680

Folder label: “385 345 SOUTH END AV 1083376, 16/100

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NYC 9111 Public Portal Document

:.- 104 East 25th Street New York. New York 10010 www.ato- enviro.corn `: 212.353.8280 Fsx 212.353.6306 ATC '"-" ---`~ October 8, 2001

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

Re: Report of TEM Analysis

Dear Mr. Sarett: transmission electron microscopy ..( 'EM) Following are the results of samples from our Group No;. 5635: analysis of four PCM air

Client: Mid -State Ave. , Bides, 500 Project Name: 385 South End Location: Various Ants. Samples received: 10/08/01 transmitted to you and document the data These results will confirm conformance witr the performed in strict today. The analyses were Issue 2, August 15, 1994 7402, methodology of the NIOSP methoa. examined at of the samples were Forty grid openings from each 1,000X and ±0,000X; (approximately relatively iow magnifications wiaths between 0 25u Sum in length and for structures greater than tan 3 1. length to width ratio greater and Sum, and having a to be observed ry PCvt would be large enougi: These structures analysis.

samples in the were detected in the Only non- asbestos structures following proportions:

cellulose F/CC as sample gypsum Asbestos

0.0°s 0.0 1 00 d°s 0.0 3 100.0% 0 0 100.00 0.0 ,,. 5 a o 57.4 0. 0 6 42.6

asbestos Asa, c e .ue ce,:no s,ampie exceeds 0 0± F/CC as

,

NYC-WTC 000117674

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