TEM Asbestos air sample results, NYC BOE, Apr 29 2002

NYC 9/11 Public Portal Document

TEM Asbestos (air) Count Sheet Ctient Name: NYC BOE Volume (liters): 1920 Lab Group #: 7567 Filter Type / Filter Area: MCE 385 mm^ Lab Sample #: 10 Grid Opening Size: 0.01124 Client Sample 10 Area Examined: 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: MARK PEYSAKHOV

GO. Structure Structure Type Length ID of Structure N or N EDS (Nonadb No F B C M >=05 pi >=5iJ Chrys Amphibole Nonasb Ambig/ND No Coord <5m Elements)

i 1 I !

Struct = > 0.5p > 5:1 Aspect Ratio Grid acceptance;

v = Positive diffraction pattern properties conforming to <50% undissoh/ed 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 i >5|J v= EDS spectrum conforming to laboratory holes or opaque areas identification criteria observed Chrysotile AMPHIBOLES Amphibole j F = Single Fiber Amosite B = Bundle 33 fibers <1 fiber diameter apart Crocidolite Ambiguous C = Cluster (>3 Intersections) Anthophyllite Non-Asbestos Tremolite M = Matrix Non-Identified Actinolite NSC = No Structures Detected

CONFIDENTIAL, CITY_21MC100_003471342 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000177116