Ambient air sampling report for 105 Duane Street, Feb 2002

NYC 9/11 Public Portal Document ATC ASSOCIATES INC. — TEM ANALYSIS LAB GROUP #: 5761 - 10/25/01 62191 Filter Type MCE_25_ mm Operator Lab Sample No. Filter Area 385 mm“2 Client Spl. No. 18 EM_10_CRX Grid I.D. FES, 7 Disk No. re Instrument I.D. Screen Magnification 16,400X (GO) Area 0.01124 mm*2 Comments Ace. Voltage go kV No. GO to be Analyzed _6 (4.721 Struct. Corspd. to 70 s/mm GO. | Structure [Structure Type Length LD. of Structure N or“ (Noaesb No|Coord.| No. {Fi BIC |M 20.5 um | »5um |Chrys| Amphibole | Nonasb. |Ambig./ND| Elements 4/4 Wf? HE Ta) sivb uf LS +G6\| 4 S|QZi f TC XZ 4 (obs No. (from 1 in S asbestos— Identify all structures using EDS Chec! 1 k diffraction for asbestos Store ail unrepeated spectra —~ to 70a/thm (lst 4) containing samples) Grid acceptance: “34 = . ¢ < undissolved pr, overlapp: d * Struct. > O.5um & > 5:1 Aspect Ratio <10% particulate coverage >S0% coverage Totals Nw Not Observed (EDS spectrum or diffraction pattern) jat least 20 unfolded or overlapped grid squares V2 Positive diffraction pattern properties conforming <5%_holes_or opaque areas to laboratory identification criteria observed. for _chry 0.73nm for (020) reflections, 0.85nm spacing for the layer line repeat, streaking of (116) and (130) reflections, For amphiboles: 0.S3nm layer line repeat, and approx. 3.5 ratia of non-twinned layer line spot spacing to layer line repeat distance (6.83nm). F B C M > 5um omer Chrysotile Avoided portion of filter (2mm wide) Amphibole Portion of [filter subject to examination = EDS spectrum conforming to laboratory Ambiguous identification criteria observed. AMPHIBOLES Ps Single Fiber (1-3 intersections = 1-3 fibers) Amosite B= Bundle {33 fibers <1 fiber diameter apart) 23mm filter Crocidolite Non-asbestos ie aur >3 intersections) Stopping Rules: Anthophylilite NSD= No Structures Detected >80 9/G.0. or im lat 4 6.0. Tremolite _ spe J Actinolite Non-lIdentified NYC-WTC_000104202