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 Lab Group #: 6884 Filter Type / Filter Area: MCE 385 mm- Lab Sample #: 7 GricLQpening^i^ 0.01124 Client Sample #: 07 AreaExamined: 0.04496 mm-

GRID BOX; c Magnification: 20.000 GRID ID: 23 Accelerating Voltage: 100 KeV # Grid Openings: 4 Analysis Date: 3/2/02

Analysis Performed By: MARK PEYSAKHOV

GO. Structure Structure Type Length ID of Structure N or 4 EDS (Nonadb No F B C M >=05 p >=5(j Chrys Amphibole Nonasb Ambig/ND No Coord <5p Elements)

4-

Struct = > 0.5g > 5:1 Aspect Ratio Grid acceptance;

4= Positive diffraction pattern properties conforming to <50% undissolved filler, overlapped or folded Totals <10% particulate coverage >60% coverage ate laboratory' identification criteria observed least 20 unfolded or overlapped grid squares <5% F B C M >5u 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 Tremolite M = Matrix Actinolite Non-Idennfieci j NSD = No Structures Detected

CONFIDENTIAL, CITY_21MC100_003468243 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000181269