TEM Asbestos air sample results, NYC BOE, Nov 2001

NYC 9/11 Public Portal Document

TEM Asbestos (air) Count Sheet Client Name: NYC BOE Volume (liters): 1944 Lab Group #: 5974 Filter Type / Filter Area: MCE 385 min^ Lab Sample #: Grid Opening Size: 0.01124 Client Sample #: 7 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 V EDS No (Nonadb F B C M >=05 p :>=5|j I Chrys Amphibole NonasC Ambig/ND No Coord <5p Elements)

2 c?’ 2 z- / □ >>-7

Struct = > 0.5u > 5:1 Aspect Ratio Gna acceptance: 7 = Positive diffraction pattern properties conforming to <50% undissolved filter, overlapped or folded Totals laboratory identification crilena observed <10% particulate coverage >50% coverage ate least 20 unfolded or overlapped grid squares <5% F B C M >5p 4 = EDS spectrum conforming to laboratory holes or opaque areas identification criteria observed Chrysotile AMPHIBOLES ) Amphibole F = Single Fiber i Amosite j S = 3undle (<3 fibers <1 fiber diameter apart I Crocidolite Ambiguous C = Cluster (>3 Intersections) Anthophyllite Non-Asbestos Tremolite M = Matrix Non-Identified Actinolite NSD = No Structures Detected

CONFIDENTIAL, CITY_21MC100_003458423 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000179190