Asbestos air analysis results, H.S., April 2002

NYC 9/11 Public Portal Document

TEM Asbestos (air) Count Sheet Client Name: NYC BOE Volume niters): 1928 Lab Group #: 7333 Filter Type / Filter Area: MCE 385 mm^ Lab Sample #: 15 Grid Opening Size: 0.01124 Client Sample #: 18 Area Examined: 0.04496 mm- GRID BOX: Maanification: 20,000 GRID ID: Accelerating Voltaae: 100 KeV # Grid Openinas: 4 Analysis Date: 4/5/02

Analvsis Performed Bv: MARK PEYSAKHOV

GO. Structure Structure Type Length ID of Structure N or 4 EDS No (Nonadb F B C M >=05 pi I >=5p Chrys Amphibole Nonasb Ambig/ND No Coord <5p Elements)

z—) X’ O’

Struct = > O.Sp > 5:1 Aspect Ratio Grid aaeptance:

yl- Positive diffraction pattern, properties conforming to <50% undissolved filter, overlapped or folded Totals <10% particulate coverage >50% coverage ate laboratory identification criteria observed least 20 unfolded or overlapped grid squares <5% [ F B C ! M EDS spectrum conforming to laboratory holes or opaque areas identification criteria observed Chrysotile A.MPHIBOLES Amphibole F = Single Fiber Amosite B = Bundle (<3 fibers <1 fiber diameter apart Crocidolite Ambiguous C = Cluster (?3 Intersections) Anthophyllite Non-Asbestos Tremolite M = Matnx Non-Identified Actinolite NSD = No Structures Detected

CONFIDENTIAL, CITY_21MC100_003459916 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000179536