TEM Asbestos air sample results, NYC BOE, Dec 2001

NYC 9/11 Public Portal Document

TEM Asbestos fair) Count Sheet Client Name: NYC BOE V olume filters): 1928 Lab Group #: 6052 Filter Type / Filter Area: MCE 385 mm- Lab Sample #: 11 Grid Opening Size: 0.01124 Client Sample #: 13 Area Examined: 0.04496 mm-

GRID BOX: Magnification: 20,000 GRID IP: Accelerating Voltage: 100 KeV # Grid Openings: 4 Analysis Date: 12/6/01

Analysis Performed By: MARK PEYSAKHOV

GO, Structure Structure Type Length ID of Structure N or v EDS * No >=05p’ 1 : -5p (Nonadb F B C M Chrys Amphibole Nonasb Ambig/ND No Coord <5p Elements)

' _ 3 -

Struct = > 0.5)1 -> 5:1 Aspect Ratio Grid acceptance:

Positive diffraction pattern properties conforming to <50% undissolved filter, overlapped or folded Totals laborator)’ identification criteria observed <10% particulate coverage >50% coverage ate least 20 unfolded or overlapped grid squares <5% F B C >5u y- EDS spectrum conforming to laboratory M holes or opaque areas Identification criteria observed Chrysotile amphYboles Amphibole = 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 NSD = No Structures Detected Actinolite . i__l.

CONFIDENTIAL, CITY_21MC100_003467385 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000180693