TEM asbestos air sample results, NYC BOE, Mar 2002

NYC 9/11 Public Portal Document

TEMAsbestosXairLCount Sheet Client Name: NYC BOE Volume (liters): 1936 Lab Group #: 7204 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: 3/25/02

Analysis Performed By: ROMAN PEYSAKHOV

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

2(0 T~pg g -p? 4/'

Ip—

Struct = > 03p >5:1 Aspect Ratio Grid acceptance; n'= 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 7= 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 Non-Identified Actinolite i NSD = No Structures Detected

CONFIDENTIAL, CITY_21MC100_003467083 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000180499