TEM Asbestos air sample results, NYC BOE, Mar 2002

NYC 9/11 Public Portal Document

TEM Asbestos (air) Count Sheet Client Name: NYC BOE Volume niters): 1936 Lab Group #: 7102 Filter Type / Filter Area: MCE 385 mm^ Lab Sample #: 20 Grid Opening Size: 0.01124 Client Sample #: 20 Area Examined: 0.04496 mm^ GRID BOX: Magnification: 20 000 GRID ID: Accelerating Voltage: 100 KeV # Grid Openings: 4 Analysis Date: 3/16/02

Analysis Performed By: AoT ROMAN PEYSAKHOV

GO. Structure Structure Type Length ID of Structure Norv EDS No Nonasb (Nonadb F B C M >=05 p >=51J Chrys Amphibole Ambig/ND No Coord <5p Elements)

1/ ----- M fz c -U__ tfO- _ ____

Struct = > 0.5g > 5:1 Aspect Ratio Grid acceptance; Positive diflraction pattern properties conforming to undissolved filler, overlapped or folded Totals ___ laboratory identification .k______ criteria observedj <10% particulate coverage >50% coverage ate least 20 unfolded or overlapped grid squares <5% F B C M >5p 'i- EDS spectrum conforming to laboratory holes or opaque areas identification criteria observed Chrysotile i AMPHIBOLY i Amphibole F = Single Fiber Amosite E = Bundle (<3 fibers <1 fiber diameter apart Crocidolite Ambiguous C = Cluster (>3 Intersections) Anthophyllite Non-Asbestos T remolite M = Matrix Actinolite Non-Identified NSD = No Structures Detected

CONFIDENTIAL, CITY_21MC100_003466823 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000180330