TEM Asbestos air sample results, NYC BOE, Mar 2002

NYC 9/11 Public Portal Document

TEM Asbestos (air) Count Sheet Client Name: NYC BOE Volume filters): 1936 Lab Group #: 7192 Filter Type / Filter Area: MCE 385 mm- Lab Sample #: 2 Grid Opening Size: 0.01124 Client Sample #: 2 Area Examined: 0.04496 mm= GRID BOX: Magnification: 20,000 GRID ID: Accelerating Voltage: 100 KeV # Grid Openings: 4 Analysis Date: 3/24/02

Analysis Performed By: MARK PEYSAKHOV

GO. Structure Structure Type Length ID of Structure NorV EDS (Nonadb No F B c M >=05 M >=5ij Chrys Amphibole Nonasb Ambig/ND I Elements) No Coord <5u

2C- Ci.

■3^ < -Oct

Struct = > 0.5p > 5:1 Aspect Ratio Grid acceptance:

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

CONFIDENTIAL, CITY_21MC100_003467041 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000180467