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 (liters): 1920 Lab Group #: 7148 Filter Type / Filter Area: MCE 385 mm- Lab Sample #: 13 Grid Opening Size: 0.01124 Client Sample #: 13 Area Examined: 0.04496 GRID BOX: Magnification: 20,000 GRID ID: Accelerating Voltage: 100 KeV # Grid Openings: 4 Analysis Date: 3/20/02

Analysis Performed By: ROMAN PEYSAKHOV

GO. Structure Structure Type Length ID of Structure N or n EDS No >=05 p (Nonadb F B C M >=51J Chrys Amphibole Nonasb Ambig/ND No Coord <5m Elements)

3^/ C 1 {I

Struct = > 0.5g > 5:1 Aspect Ratio Grid acceptance: •J- 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% F B C M >5U 'J= EDS spectrum conforming to laboratory holes or opaque areas identification criteria observed Chrysotile /amphiboles i Amphibole F = Single Fiber ■ Amosite 1 B = Bundle (<3 fibers <1 fiber diameter apart Crocidolite Ambiguous C = Cluster (>3 Intersections) Anthophyllite Non-Asbestos ' Tremolite M = Matrix Non-Identified Actinolite t NSD = No Structures Delected

CONFIDENTIAL, CITY_21MC100_0 11533412 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000181571