TEM Asbestos air sample results, NYC BOE, Apr 2002

NYC 9/11 Public Portal Document

TEM Asbestos fair) Count Sheet Client Name: NYC BOE Volume (liters): 1920 Lab Group #: 7494 Filter Type / Filter Area: MCE 385 mm- Lab Sample #: 14 Grid Opening Size: 0.01124 Client Sample #: 14 Area Examined: 0.04496 mm- GRID BOX: Magnification: 20,000 GRID ID: Accelerating Voltage: 100 KeV # Grid Openings: 4 Analysis Date: 4/21/02

Analysis Performed By: MARK PEYSAKHOV

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

—I □ I --- I —

Struct =- > O.ap >5:1 Aspect Ratio Grid acceptance: V = Positive diffraction pattern properties conforming to <50% undissolved filter, overlapped or folded Totals laboratory identificalion criteria observed <10% particulate coverage >50% coverage ate least 20 unfolded or overlapped grid squares <5% p I F I B J C I M ‘ y= EDS spectrum conforming to laboratory holes or opaque areas L identification criteria observed Chrysotile I AMPHIBOLES Amphibole ! - = Single F Per Amosite 5 = Sunale i<3 fibers <1 fiber diameter apart Crocidolite Ambiguous ) C = Cluster (>3 intersections) Anthophyllite Non-Asbestos Tremolite M = Matrix \ Non-Identified , Actinolite NSO = Mo Structures Detected

CONFIDENTIAL, CITY_21MC100_003471182 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000177006