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): 1840 Lab Group #: 7455 Filter Type / Filter Area: MCE 385 mm- Lab Sample #: 15 Grid Opening Size: 0.01124 ClieirtSaniple^ 15 .Area Examined: 0.04496 mm’ GRID BOX: Magnification: 20,000 GRID ID: .5. Accelerating Voltage: 100 KeV # Grid Openings: 4 Analysis Date: 4/18/02

Analysis Performed By: MARK PEYSAKHOV

GO. Structure Structure Type Length ID of Structure N or N EDS No {Monadb F B C M >=05 u >=5|j Chrys Amphibole ^Jonasb Ambig/ND No Coord <5u Elements) ]

i

! ! j i

Struct > O.CLi > 1 Aspect Ratio Grid acceptance:

•< = Positive diffraction pattern properties conforming to <50% undissoived filter, overlapped or folded Totals laboratoty identification criteria observed <10% particulate coverage >50% coverage ate least 20 unfolded or oveitapped grid squares <5% v= EDS soectrum conforming io laboratory holes or opaque areas ________ P B i C M >5u identificatnn criteria observed Chrysotile I AMPHIBOLES Amphibole F = Single Fiber Amosite 3 = Bonn e (<3 fibers <1 fiber ciameter apart Crocidolite Ambiguous i C = Cluster (>3 Intersections) Anthophyllite I Non-Asbestos Tremolite M = Matrix I Son-Identified Actinolite NSO = No Structures Detected

CONFIDENTIAL, CITY_21MC100_003471140 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000176974