TEM Asbestos air sample results, NYC BOE, Apr 2002

NYC 9/11 Public Portal Document

TEM Asbestos (airl Count Sheet Client Name: NYC BOE Volume (liters): 1920 Lab Group #: 7494 Filter Type / Filter Area: MCE 385 mm- Lab Sample #: 5 Grid Opening Size: 0.01124 Client Sample #; 05 Area Examined: 0.04496 mm- GRID BOX: Magnification: 20,000 GRID ID: Accelerating Voltage: 100 KeV # Grid Openings: 4 Analysis Date: 4/21/02

Analysis Performed By: MARK PEYSAKHOV

GO, Structure Structure Type Length ID of Structure Nor 7 EDS No >=05 p : •=5p (Nonadb F B C M Chrys Amphibole Nonasb Ambig/ND No Coord <5p Elements)

Struct = > 0.5n >5:1 Aspect Ratio Grid acceptance:

7= 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% \ i F I B i C I M i >bu 7= EDS spectrum conforming to laborator/ holes or opaque areas loentificatior criteria observed Chrysotile I I . I A.MPHIBOLES Amphibole E = Single Fiber Amosite B = Bundle (<3 fibers <1 fiber ciameter aoart Crocidolite Ambiguous C = Cluster i>3 intersections) Anttiophyllite Non-Asbestos Tremolite M = Matrix Non-Identified ’ Actinolite NSC = No Structures Detected

CONFIDENTIAL, CITY_21MC100_003471173 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000176998