NYC-WTC_000201929

NYC 9/11 Public Portal Document

TENBAsbestos (air) Count Sheet Client Name: NYCBGE Volume (liters): 1840 Lab Group #: 6734 Filter Type / Filter Area: MCE 385 mm" Lab Sample #: Grid Opening Size: 0.01124

Client Sample #: 07 Area Examined: 0.04496 mm

GRID BOX: Magnification: 20,000 GRID ID: Accelerating Voltage: 100 KeV # Grid Openings: 4 Analysis Date: 2/19/02

Analysis Performed By: MARK PEYSAKHOV

GO. Structure Structure Type Length ID o' Structure TSor v ■ -EDS (Nonadb No F B C M ■^osTi “ ■=54 . Chrys Amphibole - Nonasb Amblg/ND No Coord Elements) <5p

-.5 0^ '<31

i • .'7'

Struct = >0.54 > 5:1 Aspect Ratio Grid acceptance:

Positive diffraction pattern properties conforming to <50% undissolved filter, overlapped or folded Totals <10% particulate coverage >50% coverage ate laboratory identification criteria observed least 20 unfoided or overlapped grid squares <5% F B C M >5m ■V='EDS spectrum contorming to laboratory . holes or opaque areas identification criteria observed Chrysotile AMPHIBOLES t Amphibole F = Single Fiber Amosite B = Bundle (<3 fibers <1 fiber diameter apart Crocidolite Ambiguous Anthophyllite Non-Asbestos C = Cluster (>3 Intersections) Tremolite M-Matrix Actinolite Non-Identified NSC = No Structures Detected

CITY_21MC100_003269672

NYC-WTC_000201929