TEM Asbestos air sample results, NYC BOE, Mar 2002

NYC 9/11 Public Portal Document

TEM Asbestos fair) Count Sheet Client Name: NYC BOE Volume (liters): 1920 i±ahjGroui)^ 6884 Filter Type / Filter Area: .MCE 385 mm- Lab Sample #: 4 Grid Opening Size: 0 01124

Client Sample #: 04 Area Examined: 0,04496 mm-

GRID BOX: Magnification: 20.000 GRID ID: Accelerating Voltage: 100 KeV # Grid Openings: 4 AnalysisJDate: 3G/02

Analysis Performed By: MARK PEYSAKHOV

GO. Structure Structure Type Length ID of Structure N or v EDS No >=05 p I ;>=5(j (Nonadb F B C M Chrys Amphibole NonasD Ambig/ND No Coord <5u Elements;

'7

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

4= Positive diffraction pattern properties conforming to <50% undissolved filter, overlapped or folded Totals <10% particulate coverage >50% coverage ate laboratory identification criteria observed least 20 unfolded or overlapped grid squares <5% F B C M I Au EDS spectrum conforming to laboratory holes or opaque areas ---- i----- Clirysotile Identification criteria observed AMPHIBOLES I__ Amphibole j F = Single Fiber Amosite B = Bundle (<3 fibers <1 fiber diameter apart Crocidolite Ambiguous i C = Cluster (>3 Intersections) Anthophyllite Non-Asbestos Tremolite M = Matrix Non-Idcntified Actinolite NSD = No Structures Detected

CONFIDENTIAL, CITY_21MC100_003468240 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000181266