TEM Asbestos air sample results, NYC BOE, Apr 2002

NYC 9/11 Public Portal Document

* TEM Asbestos (air) Count Sheet Client Name: NYC BOE Volume (liters): 1840 Lab Group #: 7404 Filter Type / Filter Area: MCE 385 mm^ Lab Sample #: 15 Grid Opening Size: 0.01124 Client Sample #: 15 Area Examined: 0.04496 mm^ GRID BOX: Magnification: 20,000 GRID IP: Accelerating Voltage: 100 KeV # Grid Openings: 4 Analysis Date: 4/13/02

Analysis Performed By: ROMAN PEYSAKHOV

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

'iP F TF 11 M Tv 2 4- 7^

Struct = > 0.5p _> 5:1 Aspect Ratio Grid acceptance: A- Positive diffraction pattern properties conforming to <50% undissolved filter, overlapped or folded Totals <10% particulate coverage >50% coverage ate laboratory identification criteria observed V= EDS spectrum conforming to laboratory least 20 unfolded or overlapped grid squares <5% T FB c M >5u holes or opaque areas identification criteria observed Chrysotile AMPHIBOLES Amphibole F = Single Fiber Amosite ! B = Bundle (<3 fibers <1 fiber diameter apart Crocidolite Ambiguous C = Cluster (>3 Intersections) Anthophyllite Non-Asbestos T remolite M = Matnx Non-Identified Actinolite NSD = No Structures Detected

CONFIDENTIAL, CITY_21MC100_003471030 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000176903