TEM Asbestos air sample results, NYC BOE, Jan 31 2002

NYC 9/11 Public Portal Document

TEM Asbestos (air) Count Sheet Client Name: NYC BOE Volume (liters): 1920 Lab Group #: 6515 Filter Type / Filter Area: MCE 385 mm- Lab Sample #: 13 Grid Opening Size: 0.01124 Client Sample #: 13 Area Examined: 0.04496 mm-

GRID BOX: Magnification: 20,000 GRID ID: Accelerating Voltage: 100 KeV # Grid Openings: 4 Analysis Date: l/31,/02

Analysis Performed By; MARK PEYSAKHOV

GO, Structure Structure Type Length ID of Structure N or EOS (Nonadb No F B C >=05 u i ■=5|J Chrys Amphibole Nonasb Ambig/ND No Coord <5p Elements)

Struct = > 0.5p > 5,1 Aspect Ratio Grid acceptance: Positive diffraction pattern properties conforming to ^50% undissolved filter, overtapped or folded Totals laboratory identification criteria observed <10% particulate coverage >50% coverage ate least 20 unfolded or overlapped grid squares <6% F B C ] M >5p EDS spectrum conforming to laboratory holes or opaque areas identification criteria observed Cltxysotile AMPHIBOLES Amphibole F = Single Fiber ! Amosite B = Bundle (<3 fibers <1 fiber diameter apart Crocidolite Ambiguous C = Cluster (>3 Intersections) Anthophyllite Non-Asbestos 1 Tremolite M = Matrix NSD = No Structures Detected Actinolite Non-Identified T

CONFIDENTIAL, CITY_21MC100_003467639 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000180856