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): 1944 Lab Group #: 7108 Filter Type / Filter Area: MCE 385 Lab Sample #: 19 Grid Opening Size: 0.01124 Client Sample #: 19 Area Examined: 0.04496 mm^ GRID BOX: Magnification: 20,000 GRID ID: a; ~ 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 Nory EDS No (Nonadb F B C M >=05 M >=5p Chrys Amphibole Nonasb Ambig/ND No Coord <5u 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 >5|j 'J= EDS spectrum conforming to laboratory holes or opaque areas identification criteria observed Chrysotile j 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 Non-Identified Actinolite NSD = No Structures Detected

CONFIDENTIAL, CITY_21MC100_003466851 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000180349