TEM grid data sheet, Sample 4, P.S. 150M, May 2002

NYC 9/11 Public Portal Document

TEM Asbestos fair) Count Sheet Client Name: NYC BOE Volume (liters): 1920 Lab Group #: 7665 Filter Type / Filter Area: MCE 385 mm^ Lab Sample#: 4 Grid Opening Size: 0.01124

Client Sample #: 04 Area Examined: 0.04496 mm^

GRID BOX: Magnification: 20,000 GRID ID: Accelerating Voltage: 100 KeV # Grid Openings: 4 Analysis Date: 5/7/02

Analysis Performed By: MARK PEYSAKHOV

GO. Structure Structure Type Length ID of Structure N or EDS No (Nonadb F 8 C M ^-05 u Chrys Amphibole Nonasb Ambig/ND No Coord <5u Elements)

Struct = > 0.5u > 5; I Aspect Ratio Grid acceptance: 'J= Positive diffraction pattern properties conforming to <50% undissolved filter, overlapped or folded Totals laboratory identificahon criteria observed <10% parBeulale coverage >50% coverage ale least 20 unfolded or overlapped grid squares <5% F B C M >5iJ >/= EDS spectrum conforming to laboratory holes Of opaque areas identification criteria observed Chrysotile AMPHIBOLES Amphibole F = Single Fiber Amosite B = Bundle (<3 libers <1 fiber diameter apart Crocidolite Ambiguous C = Cluster (>3 Intersections) Anthophyllite Non-Asbestos Tremolite M = Matrix Non-Identified Actinolite NSD = No Structures Detectsd

CONFIDENTIAL, CITY_21MC1OO_OO33947O8 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000178661