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 #: 7466 Filter Type / Filter Area: MCE 385 mm- Lab Sample #: 10 Grid Opening Size: 0.01124 Client Sample #: 10 Area Examined: 0.04496 mm’ GRID BOX: Magnification: 20,000 GRIDID: Accelerating Voltage: 100 KeV # Grid Openings: 4 Analysis Date: 4/20/02

Analysis Performed By: MARK PEYSAKHOV

GO. Structure Structure Type Length 10 of Structure N or \ EDS No (Nonadb F B C M >=05 M >=5|j Chrys Amphibole Nonasb Ambig/ND No Coord <5m Elements)

A ATA'

Struct == > 0.5q > 5:1 Aspect Ratio Grid acceptance:

v'= Positive diffraction pattern properties conforming to <50% undissolved filter, overlapped or folded Totals laboratory identification criteria observed <10% particulate coverage >50% coverage ate least 20 unfolded oroveriapped grid squares <5% I F I B j C M 5 >5|j 7= EDS spectrum conforming to laboratory holes or opaque areas --------------- i___ I____I__ - Identification criteria observed Chrysotile ] AMPHIBOLES Amphibole r = Single Fiber Amosite B = Bundle -7 fibers <1 fiber diameier apart Crocidolite Ambiguous C = Cluster ;>3 intersections! Anthophyllite Non-Asbestos Tremolite M = Matrix Non-Identified Actinolite NSD = No Structures Detected

CONFIDENTIAL, CITY_21MC100_003471157 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000176988