TEM asbestos analysis data sheet, Sep 2002

NYC 9/11 Public Portal Document

TEM Asbestos (air) Count Sheet Client Name: NYC BOE Volume (liters): 1928 Lab Group #: 8828 Filter Type / Filter Area: MCE 385 mm- Lab Sample #: 21 Grid Opening Size: 0.01124

Client Sample #: 21 Area Examined: 0.04496 mm-

GRID BOX: Magnification: 20,000 GRID ID: Accelerating Voltage: 100 KeV # Grid Openings: 4 Analysis Date: 9/10/02

Analysis Performed By: MARK PEYSAKHOV

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

------- * J

Struct = > 0.5.U >5:1 Aspect Ratio Grid acceptance: V= Posibve diffraction pattern properties conforming to <50% undissolved filter, overlapped or folded Totals laboratory identification criteria observed <10% particulate coverage >50% coverage ate least 20 unlolded or overiapped grid squares <5% F Q C M >5u V= EOS spectrum conforming to laborator/ holes or opaque areas identification criteria observed Chrysotile AMPHIBOLES Amphibole F = Single Fiber Amosite 3 = 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_003422055 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000175312