Asbestos TEM analysis results, 250 Broadway, Sept 2001

NYC 9/11 Public Portal Document 99/17/2881 88:36 21235335939 ATC ASSOCIATES INC PAGE 93/22. ATC ASSOCIATES INC. — NOB ANALYSIS Batch No. 5S. VA 35 Grid Hox No. YO Bb Operator RIP Sample No. 9-/6-TkK-~-2 Grid LD. ZH& Date S, 16.07 Grid . |Structure]|suucture trpe| _Electroa X-Ray Identity No. No. Fipic|M Oheatontion Obiervation Remarks ' TChrysotile| Amphibole : i \ i / A ys LQ : am! fi £/ fi hl ~ f> [ LQ PALL Hpi ae dg LAA LZ ay ag Ahn ES As A a “| L— F= Single Fiber (1-3 intersections = 1-3 fibers) AMPHIBOLES B= Bundle (>3 fibers <1 fiber diameter apart) Amosite C= Cluster (>3 intersections) Crocidolite M= Matrix Anthophyllite Tremolite NSD= No Struetures Detected Actinolite > Positive diffraction pattern observed conforming to identification criteria. For chrysotile: 7.3A spacing for 020 reflections (= 60um objective aperture}. §.9A spacing for the layer—line repeat (= 1/3 60um objective aperture), 110 and 130 streaks and presence of 002 and 200 reflections. For amphiboles: 5.34 layer-line repeat and approximate 3.5 ratio of non—twinneS layer-line reflection spacing to layer-line repeat distance. A = EDX spectrum observed conforming to identification criteria. Minimum Requirements: Identify 4 fibera by electron diffraction. Chrysotile: 5.34 layer-line (row) spacing with correct 020, 002, 110, 136 and 200 points or streaks. Amphibole: Correct 5.34 layer-line spacing. EDX Requirements: Chrysotile: none. Amp QUANTITATION: , Estimated Percent Asbestos on: Grid 1: Grid 2: Mean (N}:_ hibole: identify amphibole species by EDX. Percent Asbestos in Subsample: (N X K)/G: From PLM NOB ANALYSIS SHEET: 10 X 11 = 4 where 10 = total residue %, 13 = residue asb % TEM and 14 = total: % asb & tyre Also, 1% total asbestos = 100/total residue %. CAOATAY PRIVATENMIEEA CADE! tenuop te NYC-WTC_000105973