TEM Asbestos air sample results, NYC BOE, Oct 2001

NYC 9/11 Public Portal Document

TEM Asbestos (air) Count Sheet Client Name: NYC BOE Volume (liters): 1944 Lab Group #: 5S12 Filter Type / Filter Area: MCE 385 mm" Lab Sample #: 16 Grid Opening Size: 0.01124 Client Sample #: 16 Area Examined: 0.04496 mill*

GRID BOX: 3 Magnification: 20,000 GRID ID: # Grid Openings: 4 Accelerating Voltage: 100 KeV

Analysis Performed By: MARK PEYSAKHOV

GO. Structure Structure Type Length ID ofStructure Nor\ EDS No (Nonadb F B C >=05 |j >=5pi Chrys Amphibole Nonasb Ambig/ND No Coord <5pi Elements)

I I

L___J_______f i Struct = > 0.5 p _> 5:1 Aspect Ratio Grid acceptance: '/= Positive diffraction pattern properties conforming to "^0% undissolved 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 '/= EDS spectrum conforming to laboratory holes or opaque areas identification criteria observed Chrysotile i AMPHIBOLES Amphibole F = Single Fiber Amosite B = Bundle (<3 fibers <1 fiber diameter apart Crocidolite Ambiguous C = Cluster (>3 Intersections) I Anthophyllite Non-Asbestos Tremolite IV = Matrix Non-Identified Actinolite NSD = No Structures Dsterded

CONFIDENTIAL, CITY_21MC1OO_OO3459OOO SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000179347