NYC-WTC_000230319

NYC 9/11 Public Portal Document

TEM Asbestos (air) Count Sheet Client Name: NYC BOE Volume (liters): 1936 Lab Group #: 6621 Filter Type / Filter Area: MCE 385 mm- Lab Sample #: 21 Grid Opening Size: 0.01124

Client Sample #: 21 . Area Examined: 0.04496 mm-

GRID BOX: •A Magnification: 20,000 GRID ID: '/LA Accelerating Voltage: 100 KeV # Grid Openings: 4 Analysis Date: 2/10/02

Analysis Performed By: ROMAN PEYSAKHOV

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

cz cf (f

Struct = > 0.5p >5:1 Aspect Ratio Grid acceptance: V= 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 '^= EDS sperdrum conforming to laboratory holes or opaque areas identification criteria observed Chrysotile AMPHIBOLES Amphibole F = Single Fiber Amosite B = Bundle (<3 fibers <1 fiber diameter apart Crocidolite Ambiguous C = Cluster (>3 Intersections) Anthophyllite Non-Asbestos Tremolite M = Matrix Actinolite Non-Identified NSD = Nd Structures Detected

CONFIDENTIAL, CITY_21MC100_003389049 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000230319