TEM Asbestos air sample results, NYC BOE, Dec 2001

NYC 9/11 Public Portal Document

TEM Asbestos (air) Count Sheet QientNjun^ NYC BOE Volume (liters): 1944 Lab Group #: 6199 Filter Type / Filter Area: MCE 385 mm- Lab Sample #: 4 Grid Opening Size: 0.01124

Client Sample #: 4 Area Examined: 0.04496 mm*

GRID BOX: Magnification: 20,000 GRID ID: Accelerating Voltage: 100 KeV # Grid Openings: 4 Analysis Date: 12/27/01

Analysis Performed By: MARK PEYSAKHOV

30. Structure Structure Type Length ID of Structure N or y EDS (Nonadb No F B C ' M >=05 u :>=5pi Chrys j Amphibole Nonasb Ambig/ND No Coord <5|j Elements)

Struct = > Q.5n > 5:1 Aspect Ratio Grid acceptance:

4= Positive diffraction pattern properties conforming to <50% undissdived filter, overlapped or folded Totals laboratory identification criteria obsen/ed <10% particulate coverage >50% coverage ate least 20 unfolded or overiapped grid squares <5% F B C M >5u •j'= EDS spectrum conforming to laboratory Holes or opaque areas Identification criteria observed ClirysQtile AMPHIBOLES Amphibole F = Single Fiber Amosite S = 3undie (<3 fibers <1 fiber diameter apart Crocidolite Ambiguous C = Cluster (>3 Intersections) Anthophyllite Non-Asbestos T remolite M = Matrix Non-Identified NED = No Structures Delected Actinolite i

CITY_21MC100_003105102

NYC-WTC_000184427