TEM asbestos air sample results, NYC BOE, Feb 2002

NYC 9/11 Public Portal Document

TEM Asbestos fair) Count Sheet Client Name: NYC BOE Volume (liters): 1920 Lab Group 6821 Filter Type / Filter Area: MCE 385 mm- Lab Sample #: 9 Grid Opening Size: 0.01124 Client Sample #: 9 Area Examined: 0.04496 mm-

GRID BOX: Magnification: 20,000 GRID ID: Accelerating Voltage: 100 KeV # Grid Openings: 4 Analysis Date: 2/24/02

.Analysis Performed By: ROMAN PEYSAKHOV

GO Structure Structure Type Length ID of Structure Norv EDS (Nonadb I No F B C M >=05 p I >=5|j Chrys Amphibole Nonasb Ambig/NO No <5p i Elements) )

r (V JL Al

Struct = > 0.5g > 5:1 Aspect Ratio Grid acceptance:

Positive diffraction pattern properties conforming to <50% undissolved filter, overlapped or folded Totals <10% particulate coverage >50% coverage ate laboratory identification criteria observed least 20 unfolded or overlapped grid squares <5% F B ( C M >5p 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 t Tremolite M = Matrix Actinolite Non-Identified NSD = No Structures Detected

CONFIDENTIAL, CITY_21MC100_003468145 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000181217