TEM Asbestos air sample results, NYC BOE, Apr 2002

NYC 9/11 Public Portal Document

TEP/J Asbestos (air) Coomt Sheet Client Name: NYC BOE Volume niters): 1928 Lab Group #: ^392 Filter Type / Filter Area: MCE 385 mm? Lab Sample #: 12 Grid Opening Size: 0.01124 Client Sample #: 14 Area Examined: 0.04496 mm*

GRTD BOX: Magnification: 20,000 GRIP IB: Accelerating Voltage: too KeV # Grid Openings: 4 Analysis Date: 4/13/02

.Analysis Performed By: MARK PEYSAKHOV

GO. Structure Structure Type Length ID of Structure Nory EDS (Nonadb No F B C M >T05m : •=5p Chrys Amphibole Nonasb Ambig/ND No Coord <5p Elements)

Struct = > 0.5g > 5:1 Aspect Ratio Grid acceptance: ^/= Positive diffraction pattern properties conforming to 'SO’'" “ndissolved filter, overlapped or folded Totals laboratory identification criteria observed <10% particulate coverage >50% coverage ate

EDS spectrum conforming to laboratory least 20 unfolded or overlapped grid squares <5% F B c M >5p holes or opaque areas idenbfication criteria observed Chrysotile AMPHIBOLES Amphibole F = Single Fiber Amosite 3 = Bundle (<3 fibers <1 fiber diameter apart Crocidolite Ambiguous C = Cluster (>3 Intersections) Anthophyllite Non-Asbestos Tremolite M = Matrix Non-Identified Actinolite NSD = No Structures Detected

CONFIDENTIAL, CITY_21MC100_009505419

SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000178902