TEM Asbestos Air Sample Results, NYC DOE, Aug 2002

NYC 9/11 Public Portal Document

TEM Asbestos (air) Count Sheet Client Name: NYC BOE Volume (liters): 1936 Lab Group #: 8760 Filter Type / Filter Area: MCE 385 mm- Lab Sample 10 Grid Opening Size: 0.01124

Client Sample #: 10 Area Examined: 0.04496 mm^

GRID BOX: Magnification: 20,000 GRID ID: Accelerating Voltage: 100 KeV # Grid Openings: 4 Analysis Date: 8/25/02

Analysis Performed By: ROMAN PEYSAKHOV

GO. Structure Structure Type Length ID of Structure NorN EDS (Nonadb No F B C M >-05 p Chrys Amphibole Nonasb Ambig/ND

srS fe TS,If . No <5p Elements)

j-

Struct = > 0.5p >5:1 Aspect Ratio Grid acceptance: xlr 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 N= EDS spectrum conforming to laboratory holes or opaque areas identification criteria observed Chiysotile AMPHIBOLES Amphibole F < Single Fiber Amosite e = Bundle (<3 fibers <1 fiber diameter apart Crocidolite Ambiguous C < Cluster (>3 Intersections) Anthophyllite Non-Asbestos M = Matrix Tremolite Actinolite Non-Identified NSD - No Structures Detected

CONFIDENTIAL, CITY_21MC100_003430663 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000175221