TEM Asbestos air sample results, NYC BOE, Dec 2001

NYC 9/11 Public Portal Document

TEM Asbestos fair) Count Sheet Client Name: NYC BOE Volume /liters): 1944 Lab Group #: 6091 Filter Type / Filter Area: MCE 385 mm’ Lab Sample #: 4 Grid Opening Size: 0.01124

Client Sample #: 4 Area Examined: 0.04496 mm’

GRID BOX: Maenification: 20,000 GRID ID: Accelerating Voltage: 100 KeV # Grid Openings: 4 Analysis Date: 12/14/01

Analysis Performed By: NLARK PEYSAKHOV

GO. Structure Structure Type Length ID of Structure Nor V EDS No (Nonadb F B C M >=05 p •=5|j Chrys Amphibole Nonasb Ambig/ND Nc Coord Elements)

Struct = > 0.5p > 5 1 Aspect Ratio Grid acceptance: 7= Positive diffraction pattern properties conforming to <50% undissolved filter, overlapped or folded Totals laboratory identificaticn criteria observed <10% particulate coverage >50% coverage ate least 20 unfolded or overlapped grid squares <5% F B C M >5(J 7= EDS spectrum conforming to laboratory holes or opaque areas identification critena observeo Chrysotile AMPHIBOLES Amphibole F = Single Fiber ' Amosite B = Bundle (<3 fibers <1 fiber diameter apart Crocidolite Ambiguous C = Cluster (>3 Intersecfons) I Anthophyllite Non-Asbestos Tremolite M = Matrix Actinolite Non-Identified NSD = No Structures Detected

CITY_21MC100_003104754

NYC-WTC_000184188