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): 1936 Lab Group #: 7076 Filter Type / Filter Area: MCE 385 mm^ Lab Sample #: 11 Grid Opening Size: 0.01124 Client Sample #: 14 Area Examined: 0.04496 GRID BOX: Magnification: 20,000 GRIDED: Accelerating Voltage: 100 KeV # Grid Openings: 4 Analysis Date: 3/14/02

Analysis Performed By; MARK PEYSAKHOV

GO. Structure Structure Type Length ID of Structure Norv EDS No >=05 p F ;>=5|J Amphibole (Nonadb I Coord F B C M Ch^s Nonasb Ambig/ND 1 No <5p Elements)

o

i !

Struct = > 0.5u _> 5:1 Aspect Ratio Grid acceptance: 'I- Positive diffraction pattern properties conforming to <50% undissolved filter, overlapped or folded Totals laboratory identification criteria obsen/ed <10% particulate coverage >50% coverage ate least 20 unfolded or overtapped grid squares <5% F B C M >5|J EDS spectrum conforming to laboratory holes or opaque areas identification criteria 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 Tremolite M - Matrix Non-Identified Actinolite NSD = No Structures Detected

CONFIDENTIAL, CITY_21MC100_003468530 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000181468