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): 1936 Lab Group #: 5999 Filter Type ' Filter Area: MCE 385 mm* Lab Sample #: 17 Grid Opening Size: 0.01124 Client Sample #: 17 Area Examined: 0.04496 mm-

GRID BOX: Magnification: 20,000 GRID ID : Accelerating Voltage: 100 KeV # Grid Openings: 4 Analysis Date: 11/30/01

Analysis Performed By: MARK PEYSAKHOV

GO. Structure Structure Type Length ID of Structure N or 9 EDS iNonadb j No B C M >=06 (J >=5iJ Chrys Amprtifaote Nonasb Ambig/ND No Coord <5u Elements)

a

Struct = > G,5u _> 5:1 Aspect Ratio 3nd acceptance: 9= Positive diffraction pattern prcperties conforming to <50% undissolved filter, overlappec 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 >5U i 4= EDS soectrum conforming to laboratory botes 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 Deiectec

CONFIDENTIAL, CITY_21MC100_003458543 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000179260