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): 1840 . Lab Group #: 7172 Filter Type / Filter Area: MCE 385 Lab Sample #: 7 Grid Opening Size: 0.01124

Client Sample #: 07 Area Examined: 0.04496 mm’

GRID BOX: Magnification: 20,000 GRID ID: Accelerating Voltage: too KeV # Grid Openings: 4 Analysis Date: 3/23/02

Analysis Performed By: MARK PEYSAKHOV

GO. Structure ' Structure Type Length ID of Structure Norv EDS No (Nonadb F B C M >=05 p :>=5pi Chrys Amphibole Nonasb Ambig/ND No Coord <5|J Elements)

Struct = > 0.5p > 5;1 Aspect Ratio Grid acceptance; V= Positive diffraction pattern properties conforming to 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 >5u ■/= EDS spectrum conforming to laboratory holes or opaque areas identification critena 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 T remolite M = Matrix Actinolite Non-Identified NSD = No Structures Detected

CONFIDENTIAL, CITY_21MC100_003470498 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000176542