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): 1808 Lab Group #: 8178 Filter Type / Filter Area: MCE 385 mm^ Lab Sample #: 9 Grid Opening Size: 0.01124 Client Sample #: 11 Area Examined: 0.04496 mm^ GRIP BOX: Magnification: 20,000 GRID ID: Accelerating Voltage: 100 KeV # Grid Openings: 4 Analysis Date: 6/19/02

Analysis Performed By: ROMAN PEYSAKHOV

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

/W /afc=-

Struct = > 0 5p > 5:1 Aspect Ratio Grid acceptance: ^= Positive diffraction pattern properties conforming to <50% undissolved filter, overiapped or folded Totals laboratory identification criteria observed <10% particulate coverage >50% coverage ate least 20 unfolded or overtapped grid squares <5% F B C M >5u ^= EDS spectrum conforming to laboratory holes or opaque areas identification criteria observed Chrysotile rAMPHtBOLES I Amphibole F = Single Fiber Amosite B = Bundle {<3 fibers <1 fiber diameter apart Crocidolite Ambiguous C = Cluster (>3 Intersections) Anttiophyllite Non-Asbestos Tremolite M = Matrix Non-ldentified Actinolite NSD = No Structures Detected

CONFIDENTIAL, CITY_21MC100_003461672 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000179828