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 niters): 1840 Lab Group #: 7186 Filter Type / Filter Area: MCE 385 mm- Lab Sample #: 15 Grid Opening Size: 0.01124 Client Sample #: 15 Area Examined: 0.04496 mm^

GRID BOX: Magnification: 20,000 GRID ID: Accelerating Voltage: 100 KeV # Grid Openings: 4 Analysis Date: 3/24/02

Analysis Performed By: ROMAN PEYSAKHOV

GO. Structure Structure Type Length ID of Structure Norv EDS No Nonasb (Nonadb F B C M >=05 p :>=5pi Chrys Amphibole Ambig/ND No . Coord <5u Elements)

_JC_ 3____ -4— —

Struct = > O.Sp > 5:1 Aspect Ratio Grid acceptance: v/= Positive diffraction pattern properties conforming to <50% undissolved filter, overlapped or folded Totals laboratory identification criteria observed <10% particulate coverage >50% coverage ate least 20 unfolded or overlapped grid squares <5% F B C M >5p EDS spectrum conforming to iaboratory holes or opaque areas identification criteria observed Chrysotile , AMPHIBOLES ; Amphibole F = Single Fiber Amosite • B = Bundle (<3 libers <1 fiber diameter apart Crocidolite Ambiguous C = Cluster (>3 Intersections) Anthophyllite i Non-Asbestos T remotite ; M = Matrix Actinolite I Non-Identified NSD = No Structures Detected

CONFIDENTIAL, CITY_21MC1OO_OO347O528 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000176567