Air sampling summary report, 400 Chambers Street, 2002

NYC 9/11 Public Portal Document F

TEM Asbestos (air) Count Sheet Client Name: ATC Volume (liters): 1600 Lab Group #: 5805 Filter Type / Filter Area: MCE 385 mm2 Lab Sample #: 13 Grid Opening Size: 0.01124 Client Sample #: 16 - Area Examined: 0.0562 mm2 GRID BOX: c

Magnification: 20 000 GRID ID: Y144V # Grid Openings: 5 Accelerating Voltage: 100 KeV

Analysis Performed By: Nl v

ROMAN PEYSAKHOV

GO. Structure Structure Type Length ID of Structure Nor EDS No F B C M >=05 µ (Nonadb No Coord >=5p ChryS Amphibole Nonasb Ambig/ND <5µ Elements) c

3i Z i; ______ ___ ______ __ ___

/1

H ____ ________ ______

Struct => 0.5µ > 5: I Aspect Ratio Grid acceptance: 1= 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 >5p '/= EDS spectrum conforming to laboratory M holes or opaque areas identification criteria observed Chrysotile F =Single Fiber S AMPHIBO LE Amosite Amphibole 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 — _--- -- _-_-I

NYC-WTC 000102796