TEM asbestos air analysis, NYC BOE, Apr 2002

NYC 9/11 Public Portal Document

7 f

TEM Asbestos (air) Count Sheet Client Name; NYC BOE Volume (liters); 1840 Lab Group #: 7314 Filter Type / Filter Area: MCE 385 mm’ Lab Sample #: 4 Grid Opening Size: 0.01124 Client Sample#: 04 Area Examined; 0.04496 mm^ GRID BOX: Magnification; 20,000 GRID ID: Accelerating Voltage; 100 KeV # Grid Openings: 4 Analysis Date; 4/3/02

Analysis Performed By: MARK PEYSAKHOV

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

1-^

Struct = > 0.5p > 5:1 Aspect Ratio Grid acceptance: Positive difIracCon pattern properties conforming to <50% undissolved lilter. overtapj^ or foWed Tot^ laboratory identification criteria observed <10% particulate coverage >50% coverage ate least 20 unfolded or overiapped grid squares <5% F B C M >5p EDS spectrum conforming to laboratory holes or opaque areas identification criteria observed Chrysotile jAMPHIBOLES j Amphibole F = Single Fiber I Amosite I B = Bundle (<3 fibers <1 fiber diameter apart i Crocidolite I Ambiguous C = Cluster (>3 Intersections) Anthophyllite ’ Non-Asbestos Tremolite M = Matrix Non-Identified Actinolite NSD = No Structures Detected

CONFIDENTIAL, CITY_21MC100_003470800 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000176746