TEM Asbestos air sample results, NYC BOE, Apr 2002

NYC 9/11 Public Portal Document

TEM Asbestos (air) Count Sheet Client Name: N'YC BOE Volume (liters): 1840 Lab Group #: 7444 Filter Type / Filter Area: MCE 385 mm‘ Lab Sample #: 3 Grid Opening Size: 0.01124 Client Sample #: Area Examined: 0.04496 mm-

GRID BOX: Magnification: 20,000 GRID ID: Accelerating Voltage: too KeV # Grid Openings: 4 Analysis Date: 4/17/02 --------------------------------------- — Analysis Performed By: / ROMAN PEYSAKHOV

GO. Structure Structure Type Length ID of Structure N or 7 EDS 1 (Nonadb No F B C M >=05 p >=5)J Chrys Amphibole Nonasb Ambig/ND No Coord <5m Elements)

veil zW

Struct = > 0.5^u >5:1 Aspect Ratio Gnd acceptance:

v= Positive diffraction pattern properties conforming to <50% undissolved filter, overlapped or folded Totals laboratory identification criteria observed <10% particulate coverage >50% coverage ale least 20 unfolded or overlapped grid squares <5% v = EDS spectrum conforming to laboratory holes or opaque areas I F B i C I M identification criteria observed Chrysotile ; AMPHIBOLES Amphibole i F = Single Fiber Amosite B = Eunole (<3 fibers <1 fiber diameter apart Crocidolite I Ambiguous j C = Cluster f>3 Intersections) Anthophyllite [ Non-Asbestos j Tremolite M = Matrix Actinolite Non-Identified ! NSD = No Structures Detected

CONFIDENTIAL, CITY_21MC100_003471106 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000176947