Asbestos fiber analysis results, H.S. of Economics & Finance, Apr

NYC 9/11 Public Portal Document

TEM Asbestos fair) Count Sheet Client Name: NYC BOE Volume (liters): 1928 Lab Group #: 7351 Filter Type /' Filter Area: MCE 385 mm- Lab Sample #: 11 Grid Opening Size: 0.01124 Client Sample #: 13 Area Examined: 0.04496 mm* GRID BOX: Magnification: 20,000 GRID ID: Accelerating Wiltage: 100 KeV # Grid Openings: 4 Analysis Date: 4/7/02

Analysis Performed By: MICHAEL GORYCKI

GO. Structure Structure Type Length ID of Structure N or N EDS (Nongdb No F B C M >=05 u >i=5p I Chrys Amphibole Nonasb i Ambig/ND No Coord <5p E;emerts)

/ AT

9-^

I I

•Struct = > 0.5p >5:1 Aspect Ratio Grid acceptance:

7= Positive diffraction pattern properties conforming to <50% undissolved filter, overlapped or folded Totals laboratory identification criteria oDserved <'0% particuiaie coverage >50% coverage ate least 2G unfolded or overlapped end squares <5% F B 1 C ' M I ■v= EDS spsetrurn conforming Io laboratory holes O' opaque areas identification criteria observed Chrysotile .AMPHIBOLES Amphibole j 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_0 03459960 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000179555