TEM Asbestos air sample results, NYC BOE, Mar 2002

NYC 9/11 Public Portal Document

TEM Asbestos (air) Count Sheet Client Name: NYC BOE Volume (liters): 1928 Lab Group #: 7076 Filter Type / Filter Area: MCE 385 mm^ Lab Sample #: 15 Grid Opening Size: 0.01124 Client Sample #: 18 Area Examined: 0.04496 GRID BOX: Maenification: 20,000 GRID ID: Accelerating Voltage: 100 KeV Grid Openings: 4 Analysis Date: 3/14/02

Analysis Performed By: MARK PEYSAKHOV

i GO, Structure Structure Type Length ID of Stnjcture N or EDS i I No F B C M >=05 p >=5(j Chrys Amphibole Nonasb Ambig/ND (Nonadb j No 1 Coord <5p Elements)

i I j I

r~T

Struct = > 0.5u .> 5:1 Aspect Ratio Grid acceptance: Positive diffraction pattern properties conforming to <»% undissolved niter, overlapped or folded Totals laboratory identification criteria obsen/ed <10% particulate coverage >50% coverage ate least 20 unfolded or overlapped grid squares <5% F B C M >5p V= EDS 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 T remolite M = Matrix Non-Identified Actinolite NSD = No Structures Detected

CONFIDENTIAL, CITY_21MC100_003468534 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000181472