Ambient air sampling report for 105 Duane Street, Feb 2002

NYC 9/11 Public Portal Document

G ATC ASSOCIATES INC. - TEM ANALYSIS LAB GROUP #: 5761 - 10/25/01 Filter Type MCE 25 mm Operator Lab Sample No. 62207

1 Client Spl. No. 34 Instrument I.D. EM 10 CRX Screen Magnification 16.400X Filter Area 385 mm"2 Grid I.D. (GO) Area 0.0L124 mm2 Disk No. Comments ( 4.721 Struct. Corspd. to 70 s/mm"2

1 No. GO to be Analyzed 6 Ace. Voltage 80 kV EDS N or t / Length I.D. of Structure GO. Structure Structure Type (Nonasb. No Coord. No. . 5urn Chr s. Amphibole Nonasb. Ambig./ND Elements F 9 C M < D5 um //t/ .mss —

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spe~j Identify all structures using SOS Check diffraction for asbestos `Photo No. (from 1 in 5 asbestos- structures u to 70./?lm (tat 4) containing samples) Grid acceptance: K undiaaolve <50% r, overlapped or fold. Toa Struct. = 0.5um & > 5:1 Aspect Ratio <101t particulate coverage >50% coverate No Not Observed (EDS spectrum or diffraction pattern) at least 20 unfolded or overlapped grid squares ✓ <5% holes or opaque areas Positive diffraction pattern properties conforming to laboratory identification criteria observed. unused portion For cbrywul.: o.73um epaei for (020)resection.. of filter Chrysotile 0.53nm spacing for the layer Ilne repeat. streaking Avoided portion of (110) and (130) renectlon.. of filter Portion of sltrr (2mm ride) Fw amphlbete■: 0. nm layer line repeat. and appros. subject to Amphibole 7.5 ratio of non-twinnned layer line spot .pacing to summation layer line repeat distance (0.57nm). EDS spectrum conforming to laboratory AMPHIBOLES Ambiguous identification criteria observed. Amosite F= Single Fiber (1-3 intersections = 1- 3pafibers) 25mm filter Crocidolite Non —asbestos B= Bundle >3 fibers <1 fiber diameter a rt) c= cluster (>3 intersections) 5~ypiug Ru1ae: Anthophyllite r= N■trl: >20 ./c.o. or in lit + c.D. Tremolite Non —Identified NSD= No Structures Detected 4rtinolite

NYC-WTC 000104217