TEM grid data sheet, Sample 7, P.S. 150M, May 2002

NYC 9/11 Public Portal Document

TEM Asbestos (air) Count Sheet Client Name: NYC BOE Volume (liters): 1928 Lab Group #: 7665 Filter Type / Filter Area: MCE 385 mm- Lab Sample #: 7 Grid Opening Size: 0.01124 Client Sample #: 07 Area Examined: 0.04496 mm^ GRID BOX: Maenification: 20,000 GRIDID: Accelerating Voltage: too KeV # Grid Openings: 4 Analysis Date: 5/7/02

Analysis Performed By: MARK PEYSAKHOV

GO Structure Structure Type Length ID of Structure Nor V EDS I No (Nonadb I F B C M >=05 u >=5p Chrys Amphitxjle Nonasb Ambig/ND No Coord <5p Elements) |

J- >6^2^

■—1

Struct = > 0.5M >5:1 Aspect Ratio Grid acceptance: >/= 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 >5p >/= EOS spectrum conforming to laboratory holes or opaque areas identification criteria observed Chrysotile AMPHIBOLES Amphibole F = Single Fiber Amosite B = Bundle (<3 fibers <1 fiber diameter apart Crocidolite Ambiguous C = Cluster (>3 Intersections) Anthophyllite Non-Asbestos T remolite M = Matrix Non-Identified Actinolite NSD = No Structures Detected

CONFIDENTIAL, CITY_21MC100_003394711

SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000178664