TEM Asbestos air sample results, NYC BOE, Apr 2002

NYC 9/11 Public Portal Document

TEM Asbestos (air) Count Sheet Client Name: NYC BOE Volume (liters): 1805 Lab Group #: 7534 Filter Type / Filter Area: MCE 385 mm- Lab Sample #: 14 Grid Opening Size: 0.01124 Client Sample #: 14 Area Examined: 0.04496 mm- GRID BOX: Magnification: 20,000 GRID ID: Accelerating Voltage: 100 KeV # Grid Openings: 4 Analysis Date: 4/25/02

Analysis Performed By: MARK PEYSAKHOV

GO. Structure Structure Type Length ID of Structure N or \ EDS (Nonadb No F B C M >=05 u >=51J Chrys Amphibole Nonasb Ambig/ND No Coord <5p Elements)

2b

J?

I 1 Struct = > ().5p >5:1 Aspect Ratio Grid acceptance:

7= Positive diffraction pattern properties conforming to <50% undissoived filter, overlapped or folded Totals laboratory identification criteria observed <10% particulate coverage >50% coverage ate least 20 unfolded or overlapped grid squares <5% M I >5p V= EDS spectrum conforming to laboratory holes or opaque areas dentification criteria observed i Chrysotile amphiboi.es ' Amphibole i F = Single Fiber Amosite B = Bundle (<3 fibers <1 fiber diameter apart Crocidolite Ambiguous 1 S = Bluster (>3 Intersections) Anthophyllite Non-Asbestos ii Tremolite M = Matrix Actinolite ■ Non-Identified NSD = No Structures Detected

CONFIDENTIAL, CITY_21MC100_003471286 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000177077