TEM Asbestos air sample results, NYC BOE, Mar 2002

NYC 9/11 Public Portal Document

TEM Asbestos (air) Count Sheet Client Name: NYC BOE Volume (liters): 1920 Lab Group #: 7218 Filter Type / Filter Area: MCE 385 mm- Lab Sample #: 7 Grid Opening Size: 0.01124 Client Sample #: 07 Area Examined: 0.04496 mm^ GRID BOX: Magnification: 20,000 GRID ID: Accelerating Voltage: too KeV # Grid Openings: 4 Analysis Date: 3/26/02

Analysis Performed By: MARK PEYSAKHOV

GO. Structure Structure Type Length ID of Structure Nor n EDS No >=05 p (Nonadb F B C M >=5p Chrys Amphibole Nonasb Ambig/ND No Coord <5p Elements)

3 X- ■— f ---- c

Struct-> 0.5p > I Aspect Ratio Grid acceptance: '/= Positive diffraction pattern properties conforming to <50% 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 >5p ^= EDS spectrum conforming to laboratory holes or opaque areas identification criteria observed Chrysotile ^AMPHIBOLES I Amphibole F = Single Fiber Amosite I S = Bundle (<3 fibers <1 fiber diameter apart 1 Crocidolite । Ambiguous C = Cluster (>3 Intersections) ! Anthophyllite Non-Asbestos Tremolite M = Matrix Non-Identified i Actinolite NSD = No Structures Detected

CONFIDENTIAL, CITY_21MC100_003468769 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000181652