Asbestos air analysis results, H.S., May 2002

NYC 9/11 Public Portal Document

TEM Asbestos (air) Count Sheet Client Name: NYC BOE Volume (liters): 1800 Lab Group #: 7717 Filter Type / Filter Area: MCE 385 mm’ Lab Sample #: 6 Grid Opening Size: 0.01124 Client Sample #: 09 Area Examined: 0.04496 mm^

GRID BOX: Magnification: 20,000 GRIDID: £7^ Accelerating Voltage: 100 KeV # Grid Openings: 4 Analysis Date: 5/11/02 Analysis Performed By: (y'M

ROMAN PEYSAKHOV

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

4-4/^ /Oy 4 a

Struct = > 0.5(1 >5:1 Aspect Ratio Grid acceptance:

'/= Positive diffraction pattern properties conforming to <50% undissolved filter, overlapped or folded Totals <10% particuiale coverage >50% coverage ale laboratory identification criteria observed least 20 unfolded or overlapped grid squares <5% F B C M >5p EOS spectrum 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 Non-Identified j Actinolite NSC = No Structures Detected

CONFIDENTIAL, CITY_21MC100_003460735 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000179648