TEM Asbestos air sample results, NYC BOE, Nov 2001

NYC 9/11 Public Portal Document

TEM Asbestos (air) Count Sheet Client Name: NYC BOE Volume (liters): 1928 Lab Group #: 5874 Filter Type / Filter Area: MCE 385 mm^ Lab Sample #: 12 Grid Opening Size: 0.01124 Client Sample #: 12 Area Examined: 0.04496 mm^

GRID BOX: Magnification: 20,000 GRID ID: /T Accelerating Voltage: 100 KeV # Grid Openings: 4 Analysis Date: 11/11/01

Analysis Performed By: ROMAN PEYSAKHOV

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

fT 7 ____

Struct = > 0.5p-> 5:1 Aspect Ratio Grid acceptance: ■V= Positive diffraction pattern properties conforming to <50% undissolved filter, overlapped or folded Totals laboratory identification criteria observed <10% particulate coverage >50% coverage ate

EDS spectrum conforming to laboratory least 20 unfolded or overlapped grid squares <5% F B I C M >5|J 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 M = Matrix T remolite Actinolite Non-Identified NSD = No Structures Detected

CONFIDENTIAL, CITY_21MC100_003458341 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000179151