TEM Asbestos air sample results, NYC BOE, Mar 2002

NYC 9/11 Public Portal Document

TEM Asbestos fair) Count Sheet Client Name: NYC BOE Volume fliters): 1840 Lab Group #: 7230 Filter Type / FUter 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 GRIDED: /Z^C- Accelerating Voltage: 100 KeV # Grid Openings: 4 Analysis Date: 3/27/02

Analysis Performed By: Rp ROMAN PEYSAKHOV

GO. Structure Structure Type Length ID of Structure N or V EDS No (Nonadb F B C M >=05 p Chrys Amphibole Nonasb Ambig/ND No .Coord <5p Elements) fn-./ P2. 3 y P2^ -U___ /O

Struct = > 0.5p > 5.1 Aspect Ratio Grid acceptance; 4- Positive diffraction pattern properties conforming to "50% undissolved filler, overlapped or folded Totals laboratory identification criteria observed I <10% particulate coverage >50% coverage ate least 20 unfolded or overlapped grid squares <6% F B C M >5U 4- EDS spectrum conforming to laboratory holes or opaque areas identification criteria observed Chrysotile amphiboles' ' Amphibole F = Single Fiber Amosite B = Bundle (<3 fibers <1 fiber diameter apart Crocidolite Ambiguous C = Cluster (>3 Intersections) Anthophyllite Non-Asbestos Tremolite M = Matrix Non-Identified Actinolite NSD = No Structures Detected

CONFIDENTIAL, CITY_21MC1OO_OO347O6O9 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000176620