TEM asbestos air sample data sheet, Sample 1, March 2002

NYC 9/11 Public Portal Document

TEM Asbestos (air) Count Sheet Client Name: NYC BOE Volume filters): 1928 Lab Group #: 7161 Filter Type / Filter Area: MCE 385 mm^ Lab Sample #: 1 Grid Opening Size: 0.01124 Client Sample #: . 01 Area Examined: 0.04496 mm* GRID BOX: Magnification: 20,000 GRID ID: Accelerating Voltage: 100 KeV # Grid Openings: 4 Analysis Date: 3/21/02

Analysis Performed By: MARK PEYSAKHOV

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

ci < —<— {J- ,^^1 ——

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

Positive diffraction pattern properties conforming to <50% undissolved filter, overlapped or folded Totals laboratory identification criteria obsen/ed <10% particulate coverage >50% coverage ate least 20 unfolded or overlapped grid squares <5% F B C x/= EDS spectrum conforming Io laboratory M >5p 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 Tremolite M = Matrix Actinolite Non-Identified NSD = No Structures Detected

CONFIDENTIAL, CITY_21MC100_003468663 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000181575