TEM asbestos air sample data, NYC BOE, 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 #: 3 Grid Opening Size: 0.01124 Client Sample #: 3 Area Examined: 0.04496 GRID BOX: J J 7^ . Magnification: 20,000 GRID ID: 74 XX' Accelerating Voltage: too KeV # Grid Openings: 4 Analysis Date: 8/25/02

Analysis Performed By: ROMAN PEYSAKHOV

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

54^

Struct = > 0,5p > 5:1 Aspect Ratio Grid acceptance: 4= 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 >5u . .4= EDS spectrum conforming to laboratory holes or opaque areas identification criteria observed Chiysotile amphiboles" Amphibole F = Single Fiber Amosite B = Bundle (<3 fibers el 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_003430447 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000175165