TEM Asbestos air sample results, NYC BOE, Apr 2002

NYC 9/11 Public Portal Document

TEM Asbestos (air) Count Sheeit Client Name: NYC BOE Volume (liters): 1960 Lab Group #: 7412 Filter Type / Filter Area: MCE 385 mnV Lab Sample #: 14 Grid Opening Size: 0.01124 Client Sample #: 14 Area E.xarained: 0.04496 mm’ GRID BOX: Magnification: 20,000 GRID TD: Accelerating Voltage: 100 KeV ft Grid Openings: 4 Analysis Date: 4/14/02

Analysis Performed By: MARK PEYSAKHOV

GO, Structure Structure Type Length I 10 of Structure N or 7 ECS I (Nonadb No F B C M >^05 p >=5p Chrys Amphibole Nonasb AmbigyND No Coord <5p Elements)

-—

Struct = > 0.5)4. > 5:1 Aspect Ratio Grid acceptance: 7= 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 >5p 7= EDS spectrum conforming to laboratory holes or opaque areas identification criteria observed Chrysotile i AMPHIBOLES Amphibole F = Single Fiber Amosite B = Bundle (<3 fibers <1 fiber diameter apart Crocidolite Ambiguous C = Cluster (>3 Intersections) Anthophyllite Non-Asbestos Tremolite M = Matrix Non-Identified Actinolite NSD = No Structures Detected

CONFIDENTIAL, CITY_21MC100_009505461 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000178924