TEM Asbestos air sample results, NYC BOE, Apr 2002

NYC 9/11 Public Portal Document

TEM Asbestos (air) Count Sheet Client Name: HYC BOE Volume (liters): 1805 Lab Group #: 7431 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: 4/16/02

Analysis Performed By: MARK PEYSAKHOV

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

Struct = >0.5p >5:1 Aspect Ratio Grid acceptance: 7= Positive diffraction pattern properliesconforming to <50% undissolved filter, overlapped or folded Totals lacoratory identification criteria rsbfcnied <10% parSoulate coverage >50% coverage ate least 20 unfolded or overlapped grid squares <5% F B C M I >5p 7= EDS spectrum conforming to laboratory holes or opaque areas identitication criteria observed I Chrysotile AMPHIBOLES Amphibole F = Sirgle Fiber Amosite B = Bundle (<3 fibers <1 fiber dianfeter apart Crocidolite Ambiguous I C = Cluster (>3 Intersecticns) Anthophyllite Non-Asbestos j M = Matrix Tremolite Actinolite Non-Identified i NSO = No Structures Detected i _________________ I ..

CONFIDENTIAL, CITY_21MC100^003471099 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000176943