TEM grid data sheet, sample 2, Jan 2002

NYC 9/11 Public Portal Document

TEM Asbestos (air) Count Sheet ‘Client Name: NYC BOE Volume (liters): 1840 Lab Group #: 6398 Filter Type / FUter Area: MCE 385 mm^ Lab Sample #: 2 Grid Opening Size: 0.01124

Client Sample #: 02 Area Examined: 0.04496 min­

GRID BOX: Magnification: 20,000 GRID ID: Accelerating Voltage: 100 KeV # Grid Openings: 4 Analysis Date: 1/22/02

Analysis Performed By: MARKPEYSAKHOV

GO, Structure Structure Type Length ID of Structure N or N EDS No >=05 p Nonasb (Nenadb F B C M >=5p Chrys Amphibole Ambig/ND No .Coord <5|j Elements)

□ g'Z 3-^

struct = > 0.5)1 >5:1 Aspect Ratio Grid acceptance: ’/= Positive diffraction pattern properties conforming to <50% undissoived 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 >5p y'= 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_003433517 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000175805