Air sampling summary report, 400 Chambers Street, 2002

NYC 9/11 Public Portal Document

TEM Asbestos (air) Count Sheet Client Name: ATC Volume (liters): 1300 Lab Group #: 5933 Filter Type / Filter Area: MCE 385 mm2 Lab Sample #: 6 Grid Opening Size: 0.01124 Client Sample #: T-09 - Area Examined: 0.06744 mm' GRID BOX: Sf Magnification: 20,000 GRID ID: ~1}P— Accelerating Voltage: 100 KeV # Grid Openings: 6 Analysis Date: 11/20/01

Analysis Performed By: r~VD ROMAN PEYSAKHOV

GO. Structure Structure Type Length ID of Structure N or v EDS No F B C M >=05 i. >=5p (Nonadb ' No Chrys Amphibole Nonasb Ambig/ND

(Q Coord <5u Elements)

1(

i J —Z l

PF;

I ~

Struct = > 0.Sµ > 5:1 Aspect Ratio Grid acceptance: /= 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 = EDS spectrum conforming to laboratory holes or opaque areas C M >5u 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 M = Matrix Tremolite Actinolite Non-Identified NSD = No Structures Detected

NYC-WTC 000102813