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 #: 7431 Filter Type / Filter Area: MCE 385 mm- Lab Sample #: 8 Grid Opening Size: 0.01124 Client Sample #: 08 Area Examined: 0.04496 mm^

GRID BOX: Magnification: 20,000 GRID ID: Accelerating Voltage: 100 KeV # Grid Openings: 4 Analysis Date: 4/16/02

Analysis Performed By: MARK PEYSAKHOV

GO Structure Structure Type Length ID of Structure N or EDS AmbicVD (NO"*"* No F B C >=05 p Chrys Amphibole Nonasb No Coord <5p I Elements) 1

J zTT-

Struct = > 0.5(1 > 5: i .Aspect Ratio Gnd acceptance;

\'= Positive diffraction patten properties conforming to <50% undissolved filter, overlapped or folded Totals laboratory identification criteria .observed <10% particulate coverage >50% coverage ate least 20 unfolded or overlapped gnd squares <5% F B j C i M i >5u \= EDS spectrum conforming to laboratory holes or opaque areas identification criteria observed Chrysotile AMPHIBOLES Amphibole F = Single Fiber Amosite 3 = Bundle (<3 fibers <1 fiber diameter apan Crocidolite Ambiguous J " = Cluster (>3 Intersections.) Anthophyllite Non-Asbestos I Tremolite M = Matrix Non-Identified NSD = No Structures Detected Actinolite 1

CONFIDENTIAL, CITY_21MC100_003471092 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000176940