TEM Asbestos air sample analysis criteria, NYC BOE, May 2002

NYC 9/11 Public Portal Document TEM Asbestos (air) Count Sheet Client Name: NYC BOE Lab Group #: 7913 Lab Sample #: 11 Client Sample #: 11 GRID BOX: AES GRID ID: Ian # Grid Openings: 4 Volume (liters): Filter Type / Filter Area: 1920 MCE 385 mm? Grid Opening Size: Area Examined: Magnification: Accelerating Voltage: Analysis Date: 0.01124 0.04496 mm? 20,000 100 KeV 5/30/02 Analysis Performed By: ea See MARK PEYSAKHOV GO. Structure | Structure Type Length IDof Structure Nor ¥ (Nena No >=05 p >=! Amphibole Nonasb Ambig/ND No Coord FYB; Cie <5 oy Chrys Elements) Qc 12 lex zee | Tre jee JT SH — KF So —x Struct = > 0.5p > 5:1 Aspect Ratio Grid acceptance: = Positive diffraction pattem 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| >Sp V= EDS spectrum conforming to laboratory holes or opaque areas . identification criteria observed ee 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 ma NSD = No Structures Detected NYC-WTC_000184510 CITY_21MC100_003105229