TEM Asbestos Air Sample Results, NYC BOE, June 2002

NYC 9/11 Public Portal Document

TEM Asbestos (air) Count Sheet Client Name: NYC BOE Volume (liters): 1920 Lab Group #: 8229 Filter Type / Filter Area: MCE 385 mm^ Lab Sample #: 3 Grid Opening Size: 0.01124 Client Sample #: 03 Area Examined: 0.04496 mm^ GRID BOX: Magnification: 20,000 GRID ID: Accelerating Voltage: too KeV # Grid Openings: 4 Analysis Date: 6/23/02

Analysis Performed By: |Vy ROMAN PEYSAKHOV

GO. structure Structure Type . Length ID of Structure N or v EDS No >=05p -I :>=5p (Nonadb F B C M Chrys Amphibole Nonasb Ambig/ND No Coord <5p : ’ Elements)

-4—

Struct = > 0.5p > 5:1 Aspect Ratio Grid acceptance: • = Positive diffraction pattern properties conforming to <50% undissolved filter, overiappedor folded Totals laboratory identification criteria observed <10% particulate coverage >50% coverage ate least 20 unfolded or overiapped grid squares <5% F B C M >5p '/= EDS spectrum conforming to laboratory holes or opaque areas identification criteria observed Chrysotile I AMPHiBOlES I 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 Non-Identified Acbnolite NSD = No Structures Detected

CONFIDENTIAL, CITY_21MC100_003461738 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000179872