Asbestos fiber analysis results, NYC HS, Oct 2001

NYC 9/11 Public Portal Document

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

N.Y.C. Board of Education Approved N.Y. State ELAP #10879 28-11 Queens Plaza North ACCREDITED NVLAP Lab Code # 1187 Long Island City, NY 11101 Report Date: 10/25/01

ASBESTOS FIBER ANALYSIS BY TRANSMISSION ELECTRON MICROSCOPY (TEM) With Fiber Identification c elected-Area Electron Di 'tion iSAED) and Energy-Disper ,EDS

Method: AHERA Final Ru;-e, EPA Federal Register (40 CFR, Pa' Vol No 0, October 30,

Sample Identification Analysis Parameters

j’roj ect/Site: New Stuvvesant H.S., 34 5 Chambers St., NY, NY TEM Sample No.: 5758 62137 Exterior & Interior of Building & Roof Date Received: 10,/24/01 Grid Openings Analyzed:__ 4

Project Sample No.: 1 Average Grid Opening ;^06^0 0 um

Air Volume: 1944 liters Total Area Analyzed: 0.04 5(1 mm2

Filter Type: MCE 25 mm ?oreSi2e^0^45urn Analytical Sensitivity: s ' mm2 Effective .E 3 6 2 tnrr.2 0.0044 s/cc

FIBROUS PARTICULATES ANALYZED Number Obser~v^ed CONCENTRATION Total

Single Matrix Total. Struct. Filter Air Bundles Clusters Struct. Struct > = 5un; Struct/mm2 S t ru 0 i / c c num/ml

Chrysotile Asbestos 0 0 0 C 0 0.c 0000

Amphibole Asbestos 0 0 0 0 0 0.0 0.0000 0

Ambiguous 0 0 0 0 0 0 0. c 0 . oooc 0

Total asbestos (includes ambiguous structures) 0 0 0. 0 C . 0000 0 Non-Asbestos 0 C 0 0 c 0 C. C 0 .0000 N/A No Identification 0 0 0 0 0 0 0.c C . OOOO N/A

Totals (All Structures) 0 0 0,c 0.0000 M''A The estimated uncertainty of this analysis is 1 standard deviation.

Non-asbestos finer 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_003107247

NYC-WTC_000185602