TEM Asbestos air sample results, NYC BOE, Apr 29 2002

NYC 9/11 Public Portal Document

* TEM Asbestos (air) Count Sheet Client Name: NYC BOE Volume (liters): 1920 Lab Group #: 7567 Filter Type / Filter Area: MCE 385 mm^ Lab Sample #: 6 Grid Opening Size: 0.01124 Client Sample #: 06 Area Examined: 0.04496 mm^

GRID BOX: Magnification: 20,000 GRID ID: Accelerating Voltage: too KeV # Grid Openings: 4 Analysis Date: 4/29/02

Analysis Performed By: MARK PEYSAKHOV

GO. Structure Structure Type Length ID of Structure Nor 7 EDS (Nonadb No F B C M >=05 M Chrys Amphibole Nonasb Ambig/ND No Coord <5u Elements)

27 / ^2)

I Struct = > 0.5p >5:1 Aspect Ratio Grid acceptance: y = Positive diffraction pattern properiies conforming to <“% undissolved filter, ovedapped or folded Totals laboratory identification criteria observed * 10% particulate coverage >50% coverage ate least 20 unfolded or overlapped grid squares <5% F B C i M ! >6|J V= EDS spectrum conforming lo laboratory holes or opaque areas ___ I_____ I_____ identification criteria observed Chrysotile AMPHIBOLES Amphibole F = Single Fiber Amosite B = Bundle (<3 fibers <1 fiber d ameter apart Crocidolite Ambiguous C = Clusier (>3 Intersections) Anthophyllite Non-Asbestos Tremolite M = Matrix Actinolite Non-Identified NSD = Mo Structures Detecred

CONFIDENTIAL, CITY_21MC100_003471338 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000177112