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): 1920 Lab Group #: 7191 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: Maenification: 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 p >=5pj Chrys Amphibole Nonasb Ambig/ND No Coord <5p Elements)

---------- ------------ 73=:— 3 -Yv

1 I i

Struct = > 0.5p. > 5:1 Aspect Ratio Grid acceptance: N= Positive diffraction pattern properties conforming to <50% undissolved filter, overlapped or folded Totals laboratory identification criteria observed <10% particulate coverage >50% coverage ate

N= EDS spectrum conforming to laboratory least 20 unfolded or overlapped grid squares <5% F Bic M >51J holes or opaque areas identification criteria observed Chrysotile AMPHIBOLES Amphibole F = Single Fiber Amosite G = 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_003468732 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000181627