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 #: 5979 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 GRIDED: Accelerating Voltage: 100 KeV # Grid Openings: 4 Analysis Date: 11/28/01

Analysis Performed By: 2. MARKPEYSAKHOV

GO. Structure Structure Type Length ID of Structure N or y EDS (Nonadb No C M >=05 u Chrys Amphibole Nonasb j Ambig/ND No Coord <5u Elements)

Z >•

---------- 5 F-

Struct = > 0.5u _> 5:1 Aspect Ratio Grid acceptance: ■/= Positive diffraction pattern properties conforming to <50% undissolred filter, overlapped or folded Totals laboratory identification criteria observed <10% particulate coverage >50% coverage ate least 20 unfolded or overlapped grid squares <5% F B C M I >5u y = EDS spectrum conforming to laboratory holes or opaque areas identification criteria observed Chrysotile AMPHlBOLES~j Amphibole F = Single Fiber Amosite B = Bundle (<3 fibers <1 fiber diameter apart Crocidolite Ambiguous C = Cluster (>3 Intersections) Anthophyllite Non-Asbestos Tremolite M = Matrix Non-Identified Actinolite N5C = No Structures Detected

CONFIDENTIAL, CITY_21MC100_003458482 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000179219