TEM Asbestos air sample results, NYC BOE, Apr 2002

NYC 9/11 Public Portal Document

TEM Asbestos (air) Count Sheet Client Name: NYC BOE Volume (liters): 1840 Lab Group #: 7466 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: too KeV # Grid Openings: 4 Analysis Date: 4/20/02

Analysis Performed By: MARK PEYSAKHOV

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

22

I

Struct > 0,5g >5:1 Aspect Ratio Grid acceptance:

v = Positive diffraction pattern properties conforming to <50% undissolved filter, overlapped or folded Totals laborator/ identification criteria observed <10% particulate coverage >50% coverage ate least 20 unfolded or overlapped grid squares <5% F I B 1 C ; M i >5m \ = EDS spectrum conforming to laboratory holes or opaque areas identification critena observec 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 J . NSD = No Structures Detecteo

CONFIDENTIAL, CITY_21MC100_003471152 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000176983