TEM Asbestos air sample results, NYC BOE, Mar 2002

NYC 9/11 Public Portal Document

TEM Asbestos (air) Count Sheet Client Name: NYC BOE Volume /liters): 1928 Lab Group #: 7110 Filter Type / Filter Area: MCE 385 mm^ Lab Sample #: 14 Grid Opening Size: 0.01124 Client Sample #: 16 Area Examined: 0.04496 mm* GRID BOX: Magnification: 20,000 GRID ID: Accelerating Voltage: 100 KeV # Grid Openings: 4 Analysis Date: 3/17/02

Analysis Performed By: MARK PEYSAKHOV

GO. Structure Structure Type Length ID of Structure N or '/ EDS No (Nonadb F B C >=05 p ■=5pi Chrys Amphibole Nonasb Ambig/ND No Coord <5p Elements)

Struct = > 0.5p .> 5:1 Aspect Ratio Grid acceptance:

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 or overlapped grid squares <5% F B C M j >5p EDS spectrum conforming to laboratory identification criteria observed holes or opaque areas

AMPHIBOLES Chrysotile I Amphibole F = Single Fiber Amosite B = Bundle (<3 fibers <1 fiber diameter apart i Crocidolite Ambiguous C = Cluster (>3 Intersections) I Anthophyllite Non-Asbestos Tremolite M - Matrix Non-Identified Actinolite NSD = No Structures Detected -J___

CONFIDENTIAL, CITY_21MC1OO_OO34686O5 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000181522