TEM Asbestos Air Sample Data Sheet, Aug 2002

NYC 9/11 Public Portal Document

TEM Asbestos (air) Count Sheet Client Name: NYC BOE Volume (liters): 1936 Lab Group #: 8760 Filter Type / Filter Area: MCE 385 mm’ Lab Sample #: 10 Grid Opening Size: 0.01124

Client Sample #: 10 Area Examined: 0.04496 mm*

GRID BOX: Magnification: 20,000 GRID ID: Accelerating Voltage: 100 KeV # Grit! Openings: 4 Analvsis Date: 8/25/02

Analysis Performed By: ROMAN PEYSAKHOV

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

=—lL /<

Struct = > 0.5p >5:1 Aspect Ratio Grid acceptance; Vf Positive diffraction pattern properties conforming to <50% undissolved filter, overlapped or folded Totals laboratory identif cation criteria observed <10% particulate coverage >50% coverage ate least 20 unfolded ot overlapped grid squares <5% F B C M >5p N- EDS spectrum conforming to laboratory holes or opaque areas identification criteria observed Chrysotile .AMPHIBOLES Amphibolej 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 NSC = No Structures Detected

CONFIDENTIAL, CITY_21MC100_003430255

SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000175123