TEM Asbestos air sample results, NYC BOE, Nov 2001

NYC 9/11 Public Portal Document

TEM Asbestos (air) Count Sheet Client Name: NAT BOE Volume (liters): 1928 Lab Group #: 5940 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 Date: 11/21/01

Analysis Performed By: ROMAN PEYS.AKHOV

GO. Structure Structure Type Length lb of structure N or EDS No {Nonadb F B C M >=05 u :>=5p Chrys Amphibole Nonasb .Ambig/ND i No Coord <5p Elements)

7 u

! I rn Grid acceptance: Struct = > 0.5u >5:1 Aspect Ratio 4= 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 >5U EDS spectrum conforming to iacoratory holes or opaque areas identification criteria observed Chrysotile i AMPHIBOLES Amphibole F = Single Fiber Amosite B = Bundle (<3 fibers <1 fiber diameter apart Crocidolite Ambiguoiis C = Cluster (>3 Intersections) : Anthophyllite Non-Asbestos Tremolite M = Matrix I Non-Identified ’ Actinolite I^SD = No Structures Detected

CITY_21MC100_0 03106631

NYC-WTC_000185485