TEM Asbestos air sample results, NYC BOE, Apr 2002

NYC 9/11 Public Portal Document

TEM Asbestos (air) Count Sheet Client Name: NYC BOE Volume (liters): 1805 Lab Group 7534 Filter Type / Filter Area: MCE 385 mm^ Lab Sample #: 15 Grid Opening Size: 0.01124 Client Sample #: 15 Area Examined: 0.04496 mm^

GRID BOX: Maenification: 20,000 GRID ID: Accelerating Voltage: 100 KeV # Grid Openings: Analysis Date: 4/25/02

Analysis Performed By: MARK PEYSAKHOV

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

-------- i

L Struct = > l),5p > 5:1 Aspect Ratio Grid acceptance:

\ = Positive diffraction pattern properties conforming to <50% undissolved filter, overlapped or folded Totals <10% particulate coverage >50% coverage ate laboratory icentificaton criteria observed least 20 unfolded or overlapped grid squares <5% r B i C ' M I >5p ! F v = EDS spectrum conforming to aborato'; holes or opaque areas p Identification criteria observed Chrysotile AMPHIBOLES Amphibole F = Single Fiber Amosite B = Bundle (<3 fibers <1 fiber d ameter apart Crocidolite Ambiguous C = Cluster |>3 Intersections) Anthophyllite Non-Asbestos Tremolite M = Matrix Actinolite Non-Identified NSD = No Structures Detected

CONFIDENTIAL, CITY_21MC100_003471287 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000177078