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): 1800 Lab Group #: 7388 Filter Type / Filter Area: MCE 385 mm^ Lab Sample #: 16 Grid Opening Size: 0.01124 Client Sample #: 16 Area Examined: 0,04496 mm^

GRID BOX: Magnification: 20,000 GRID ID: Accelerating Voltage: too KeV # Grid Openings: 4 Analysis Date: 4/13/02

Analysis Performed By: MARK PEYSAKHOV

GO. Structure Structure Ty pe Length ID of structure N or EDS (Nonadb No F B C “M >=05 p >=5p Chrys Amphitxjie Nonasb Ambig/ND No Coord <5m Elements)

NS”

Struct = > 0.5)1 >5:1 Aspect Ratio Grid acceptance: N= 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 >5|J N= EDS spectrum conforming to laboratory holes or opaque areas Chrysotile identification criteria obsen/ed : AMPHIBOLES Amphibole _J_ 1 F = Single Fiber Amosite B = Bundle (<3 fibers <1 fiber diameter apart i Crocidolite Ambiguous C = Cluster (>3 Intersections) Anthophyllite Non-Asbestos Tremolite M = Matrix Actinolite Non-Identified NSD = No Structures Detected

CONFIDENTIAL, CITY_21MC100_003471010 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000176889