TEM asbestos air analysis log, Sample 11, Aug 2002

NYC 9/11 Public Portal Document

TEM Asbestos (air) Count Sheet Client Name: NYC BOE Volume (liters): 1952 Lab Group 8760 Filter Type / Filter Area: MCE 385 mm’ Lab Sample #: 11 Grid Opening Size: 0.01124 Client Sample #: 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; V/5 ROMAN PEYSAKHOV

■ GO. I Structure Structure T ype Length ID of Structure N or 3 EDS No >=05 p : •=5m (Nonadb F B C M Chrys Amphibole Nonasb Ambig/ND n No Coord <5p Elements)

If -

W-

Struct = > 0.5p •> 5:1 Aspect Ratio Grid acceptance: 3= 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 3= EDS spectrum conforming to laboratory holes or opaque areas L identification criteria observed Chrysotile AMPHIBOLES Amphibole F = Single Fiber Amosite B = ,Bundle (<3 libers <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_003430562 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000175198