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): 1805 Lab Group #: 7574 Filter Type / Filter Area: MCE 385 mm^ Lab Sample #: 13 Grid Opening Size: 0.01124 Client Sample #: 13 Area E.xamined: 0.04496 mm- GRID BOX: Magnification: 20,000 GRID ID: Accelerating Voltage: 100 KeV # Grid Openings: 4 Analysis Date: 4/29/02

Analysis Performed By: ROMAN PEYSAKHOV

GO. Structure [ Structure Type Length ID of Structure NorN EDS (Nonadb No , F B j C M >=05 p Chrys Amphibole Nonasb Ambig/ND — No Coord <5p Elements) ; —I__ i

/I

Struct = > 0.5u > 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

7= EDS spectrum conforming to laboratory least 20 unfolded or overlapped grid squares <5% I holes or opaque areas }. Tf B C I MI identification criteria observed Chrysotile j ■AMPHIBOLES Amphibole i F = Single Fiber Amosite 6 = Bundle l<3 fibers <1 fiber d ameter apart Crocidolite Ambiguous ; C = Cluster (>3 Intersections) Anthophyllite Non-Asbestos Tremolite M = Matrix Actinolite Non-Identified NSD = No Structures Detected

CONFIDENTIAL, CITY_21MC100_003471367 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000177133