TEM Asbestos air sample results, NYC BOE, Feb 2002

NYC 9/11 Public Portal Document

TEM Asbestos (air) Count Sheet Client Name: NYC BOE Volume (liters): 1840 Lab Group #: 6622 Filter Type / Filter Area: MCE 385 mnr Lab Sample #: 4 Grid Opening Size: 0.01124 Client Sample #: 04 Area Examined: 0.04496 mm" GRID BOX: Magnification: 20,000 GRID ID: # Grid Openings: 4 .^2 Accelerating Voltage: Analysis Date: 100 KeV 2/10/02

Analysis Performed By: ROMAN PEYSAKHOV

GO. Structure Structure Type Length ID of Stnjcture N or n/ EDS No >=05 p (Nonadb F B C M >=5p Ch^s Amphibole Nonasb Ambig/ND 1 No Coord <5p Elements)

Y /^ =

Struct = > 0.5n > 5:1 Aspect Ratio Grid acceptance: ^/= Positive diffraction pattern properties conforming to ‘^50% undissolved fiter, overlapped or folded Totals laboratory identifieation criteria observed <10% particulate coverage >50% coverage ate least 20 unfolded or overlapped grid squares <5% F B C M >5p ^= EDS spectrum conforming to laboratoiy 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 Non-Identified Actinolite NSD = No Structures Detected

CONFIDENTIAL, CITY_21MC100_003433684 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000175894