NYC-WTC_000209888

NYC 9/11 Public Portal Document

ATC ASSOCIATES INC. TEM ANALYSIS GROCF

Lab SamcLe Me. 625£ ■nrr Gee race: Glienz. SpL. No ; mm 2 Inscruinenc :.3. EM LG C?L< en MagnificaCLcn L-5. 4 0 07. Area mr?. Gommecea bage 8C kv Me. GO c :5 AnaLs 'rs' cz

Length I.D. of Structure EDS N arv^' GO. Structure structure Type (Nonasb. >0.5 um I No Coord. No. F B m cI < 5 um I » Sum Chrys.i Amphibole I Nonasb. iAmbig./ND Elements) / rr S I I B <S/'' i

1 i i I t I i i Identify Photo No. (from I ;n 5 asbeatoa- ! all atructurea uain< EOS ) Check diffraction for aabeatos I store all unrepeated spectra atructurea up to TOs/t^m (lat 4) containing samples) Grid acceptance:!. <SOX undisaolvea filter, overlapped or folded Struct. = > 0.5um k > 5:1 Aspect Ratio <1OX particulate coverage ?5OX coverage Totals Ms Not Observed (EDS spectrum or diffraction pattern) at least 20 unfolded or overlapped grid squares PoBilive diffraction pattern properties conforming <5X botes or opaque areas F B C M > Sum to laboratory identification criteria observed. -Unused portion of filter I Far ehrysatila: Q.73nm •pacing far (020) raflacUani, Q.53nm spacing for ths layer line repeat, atreaicing Chrysotile i -Avoided portion of (110) and (laO) renecUona. of filter For amphiboisa: 3.S3nm layer Una repeat, and approx. I / Portion at filter (2mm wide) 3.3 ratio of non-lvlnncd layer lint spot spacing to 4 I subject to examination Amphibole layer line repeat distance (O.SSnm).

= EDS apectrum conforming to laboratory Identification criteria observed. AMPHIBOLES j Ambiguous Fs Single Fiber (1-3 Intersections = 1-3 fibers) Amosite 3= Bundle (>3 fibers <1 fiber diameter apart] C= Cluster (>3 intersections) 25mm filt.r ; Crocidolite ; Non-asbestos i M= Matrix Stopping Rules; i >30 i/G.O. or in 1st 4 C.O. Anthophyllite ’ t MS0= Ho Structures Detected KoUU i Non-ldentified : L\DATA\PRlVATB\illXEC\CAD0XrEU3 9/32/98

CITY_21MC100_002849287

NYC-WTC_000209929