TEM Asbestos air sample results, NYC BOE, Mar 2002

NYC 9/11 Public Portal Document

TEMAsbestosJairlCount Sheet Client Name: NYC BOE Volume (liters): 1800 Lab Group #: 7261 Filter Type / Filter Area: MCE 385 Lab Sample #: 13 Grid Opening Size: 0.01124 Client Sample #: 13 Area Examined: 0.04496 mm^ GRID BOX: Magnification: 20,000 GRID ID : Accelerating Voltage: 100 KeV # Grid Openings: 4 Analysis Date: 3/30/02

Analysis Performed By: MARK PEYSAKHOV

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

■3 <s>

Struct = > O.Sp _> 5:1 Aspect Ratio Grid acceptance: •J- Positive diffraction pattern properties confomiing to <S0% undissolved filter, overiapped or folded Totals laboratory identification criteria observed <10% particulate coverage >50% coverage ate

■/= EDS spectrum conforming to laboratory least 20 unfolded or overtapped grid squares <5% holes or opaque areas - F B e M >5p 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 = Matra Actinolite Non-Identified NSD = No Structures Detected

CONFIDENTIAL, CITY_21MC100_0 03470658 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000176648