TEM Asbestos air sample results, NYC BOE, Nov 2001

NYC 9/11 Public Portal Document

TEM Asbestos (air) Count Sheet Client Name: NYC BOE Volume (liters): 1936 Lab Group #: 5897 Filter Tvpc / Filter Area: MCE 385 mm- Lab Sample #: 12 Grid Opening Size: 0.01124 Client Sample #: 12 Area Examined: 0.04496 mm-

GRID BOX: Magnification: 20,000 GRID ID: 7CP Accelerating Voltage: 100 KeV # Grid Openings: 4 Analysis Date: 11/15/01

Analysis Performed By: MICHAEL GORYCKI

GO. Structure Structure Type Length IC of structure N or N EDS (Nonadb No F B I C M >=05 p >=5p Ctirys [ Amphibole Nanasb Ambig/ND No Coord <5p Elements)

A zt xaZzSz: 4

ZZZZI 1 I i

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p ! T -— ! ! J__ __ I ( ! I I I i Struct = > 0.5p > 5:1 Aspect Ratto Grid acceptance: Positive diffraction pattern properties conforming to <50% unoissolved filter, overlapped or folded Totals <10% particulate coverage >50% coverage ate laboratory identification criteria observed least 20 unfolded or overlapped gnd squares <5% C M >5u a/= EDS spectrum conforming to laboratory holes or opaque areas p i ® identification critena observed Chrysotile AMPHIBOLES Amphibole t F = Single Fiber Amosite B = Bundle (<3 fibers <1 fiber diameter apart Crocidolite Ambiguous i C = Cluster (>3 intersections) ' Anthophyllite Non-Asbestos : i Tremolite M = Matrix Non-Identined Actinolite NSD = No Structures Detected

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NYC-WTC_000185366