TEM Asbestos air sample results, NYC BOE, Aug 2002

NYC 9/11 Public Portal Document

TEM Asbestos (air) Count Sheet Client Name: NYC BOE Volume (liters): 1952 Lab Group 8739 Filter Type / Filter Area: MCE 385 Lab Sample 17 Grid Opening Size: 0.01124 Client Sample #: 17 Area Examined: 0.04496 mm^ GRID BOX: Magnification: 20,000 GRID ID: Accelerating Voltage: 100 KeV # Grid Openings: 4 Analysis Date: 8/23/02

Analysis Performed By: ROMAN PEYSAKHOV

■ GO. Structure Structure Type Length ID of Structure Norv EDS No TToTp ;>=5pi (Nonadb F B C M Chrys Amphibole Nonasb Ambig/MD , No Coord <5p Elements)

It /w 14 it

Struct = > 0.5p > 5:1 Aspect Ratio Grid acceptance: </= Positive diffraction pattern propertiesconforming to <50% undissolved filter, overlapped or folded . Totals ■ laboratory identification aiteria observed <10% particulate coverage >50% coverage ale least 20 unfolded or overlapped grid squares <5% F B C M >5p EDS spectrum conforming to laboratory holes or opaque areas identification criteria observed Chrysotile AMPHIBOLES Amphibole F = Single Fiber Amosite 0 = Bundle (<3 libers <1 fiber diameter apart Crocidolite Ambiguous ■ C = Cluster (>3 Intersections) Anthophyllite Non-Asbestos Tremolite ■ M = Matrix Actinolite Non-Identified NSD = No Structures Detected

CONFIDENTIAL, CITY_21MC100_003430926 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000175409