TEM Asbestos air sample results, NYC BOE, Nov 2001

NYC 9/11 Public Portal Document

TEM Asbestos (air ) Count Sheet Client Name: NYC BOE VolumejUtersL 1944 Lab Group #: 5960 Filter Tvpe / Filter Area: MCE 385 mm- Lab Sample #: 14 Grid Opening Size: 0.01124 Client Sample #: 14 Area Examined: 0.04496 GRID BOX: Magnification: 20,000 GRID ID: Accelerating Voltage: 100 KeV # Grid Openings: 4 Analysis Date: 11/24/01

Analysis Performed By: MARK PEYSAKHOV

GO. Structure Structure Type i Length ID of Structure N or 9 EDS (IMonsdb No F B C M i >=05 u I >=5p ' Chrys Amphibole j Nonast Amoig/ND No Coord <5ij i i Elemenis)

UiI

Struct = > 0.5)1 >5:1 Aspect Ratio Grid acceptance. ■/ = Positive diffraction pattern properties conforming to <50% undissolved fiitei. overlapped or folded Totals laboratory identification criteria observed <10% particulate coverage >50% coverage ate least 20 unfolded or overlapped grid squares <5% F B C M >50 9= EDS spectrum conforrriing to laboratory doles or opaque areas idenfification 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-Asbsstos Tremolite M = Matrix Non-Identified Actinolite NSD = Mo Structures Detected

CONFIDENTIAL, CITY_21MC100_003458372 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000179169