TEM Asbestos air sample results, NYC SCA, Oct 2001

NYC 9/11 Public Portal Document

TEM Asbestos (air) Count Sheet Client Name: NYC SCA Volume (liters): 1928 Lab Group #: 5801 Filter Type / Filter Area: MCE 385 mm^ Lab Sample #: 20 Grid Opening Size: 0.01124 Client Sample #: 20 Area Examined: 0.04496 mm- GRID BOX: Magnification: 20,000 GRID ID: Accelerating Voltage: 100 KeV # Grid Openings: 4

Analysis Performed By: .. ROMAN PEYSAKHOV

GO. Structure Structure Type Length iD of Structure Notn EDS (Nonadb No F B C M >=05 M >=5iJ Chrys • Amphibole Nonasb Atnbig/ND No I Coord <5p Elements)

ivX tf 0

Struct = > 0.0|i .> 5:1 Aspect Ratio Grid acceptance: ^f= 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 >5iJ '/= 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 Actinolite Non-Identified NSD = No Structures Detected

CITY_21MC100_003100052

NYC-WTC_000182635