TEM Asbestos air sample results, NYC BOE, Nov 2001

NYC 9/11 Public Portal Document

TEM Asbestos (air) Count Sheet Client Name: WC BOE Volume (liters): 1944 Lab Group #: 5974 Filter Type / Filter Area: MCE 385 mm- Lab Sample #: J Grid Opening Size: 0.01124 Client Sample #: 3 Area Examined: 0.04496 mm^

GRID BOX: Magnification: 20,000 GRID ID: Accelerating Voltage: 100 KeV # Grid Openings: 4 Analysis Date: 11/26/01

Analysis Performed By: MARK PEYSAKHOV

GO. Structure Structure Type Length ID of Structure N or 9 EDS No (Nonadb F B C M >=05 0 :>=5p Chrys Amphibole Nonasb Ambig/ND No Coord <5fJ Elements)

2. □

Struct = > 0.5p > 5; i Aspect Ratio Grid acceptance: '<'= Positive diffraction pattern properties conforming to <50% undissQlved filter, ovenapped or folded Totals laboratory identification criteria observed <10% particulate coverage >50% coverage ate least 20 untolded or overlapped grid squares <5% tf B ! C M >5p \= EDS spectrum conforming to laboratory holes or opaque areas identification criteria observed Chrysotile AMPHIBOLES Amphibole F = Single Fiber Amosite B = Bundle f<3 fibers <1 fiber diameter apart Crocidolite Ambiguous C = Cluster (>3 Intersections) Anthophyllite Non-Asbestos M = Matrix Tremolite Actinolite Non-Identified NSD = No Structures Detected

CONFIDENTIAL, CITY_21MC100_003458419 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000179186