NYC-WTC_000200050

NYC 9/11 Public Portal Document

ATC Environmental, Inc. 104 East 25th Street New York, New York 10010

N.Y.C. School Construction Authority Approved N.Y. State ELAP #10879 30-30 Thomson Avenue ACCREDITED NVLAP Lab Code # 1187 Long Island City, NY 11101 Report Date: 09/17/01

ASBESTOS FIBER ANALYSIS BY TRANSMISSION ELECTRON MICROSCOPY (TEN) Kith Fiber Idenc ;atior by Selected-Area Electron Diffraction (SAED) and Energy-Dispersive X-RAY Spectroscopy (EDS! Method; AHERA. Final Rule, EPA Federal Register (40 CFR, Part 763 ), Vol. 52, No. 210, October 30, 1987

Sample Identification AnalvsOS Parameters

Project/Site; World Trade Center, NY, NY TEM Sample No.: 5518 59058 Personal 2xocsure Monitoring Date Received: 09/17/^ Grid Openings Analyzed: 10

Project Sample Nc.:_Al£l£Lx Average Grid Opening: 106.00 um

Air Volume; 466 liters Total Area Analyzed: 0.1124 mm2

Filter Type: MCE 25 mm diam,, Pere Size; 0.45 urn Analytical Sensitivity: 8.9 s/mm2 Effective Arsa: 385 mm2 0.0074 s/cc

FIBROUS PARTICULATES ANALYZED Number Observed CONCENTRATION Total Single Matrix Total. Struct. Filter Air Fibers Bundles Clusters Struct. Struct >g5um Scruct/(nm2 Struct/cc ngm/m3

Chrysotile Asbestos 3 0 11 18 5 160,1 0.1323 4366

Amphibole Asbestos 0 0 0 0 0 0 0.0 0.0000 0

Ambiguous 0 0 0 0 0 0 0.0 0.0000 0

Total asbestos (includes ambiguous, structures) 18 5 160.1 0.1323 4366 Non-Asbestcs 0 0 0 0 0 0 0.0 0.0000 N/A No Identification 0 0 0 0 0 0 0.0 0.0000 N/A

Totals (All Structures) 18 5 160.1 0.1323 N/A The estimated uncertainty of this analysis is 1 standard deviation.

Non-asbestos fiber i.d. (EDS/SAED-) : None detected Amphibole Asbestos Type: None detected

The Analysis was carried out in accordance with the approved TEM method. This laboratory is in compliance with the quality specified for the method.

Analyzed by: Report Reviewed by:

Roman Peysakhov Michael A. Gorycki, Ph.D. Director of Electron Microscopy

CITY_21MC100_003265544

NYC-WTC_000200050