Asbestos TEM micrograph data sheet, Lab Group 5790, Oct 2001

NYC 9/11 Public Portal Document

ATC ASSOCIATES INC. TEM ANALYSIS LAE GROUP 5790 • 10/29/01 Lab Sample No. 52652 Filter MCE 25 mtn Operator

Client Spl. No. IS Filter Area 385 dim^2 Grid I.D. Disk No. Instrument I.D. EM 10 CRX — Screen Magnification 15,4Q0X (GO) Area 0.01124 mm^2 Comments Acc. Voltage 00 kv No. GO to be Analyzed 4 ('3.147 Struct. Corspd. to 70 s/mm^2.)

GO. Structure SUuclut. Type Length I.D. of structure n or EDS >0.5 um (Nonasb. No Coord. No. Sum

St) F B C M < 5 um Chrys. Amphibole Nonasb. Ambig./ND Elements) / _JL__ Pz. J

Photo No. (from 1 in 5 asbestos- Identify all atructurea using EDS Check diffraction for asbestos Store all unrepeated spectra containing samples) Grid acceptance:! structures up to TOs/i^m (l«l 4) <S0X undiaaolveQ Titter?'overlapped or folded Struct, s > O.Sum Ac > 5:1 Aspect Ratio <10% particulate coverage >50% coverage Totals N= Not Observed (EDS spectrum or diffraction pattern) at least 20 unfolded or overlapped grid squares Positive diffraction pattern properties eonfarming <5% holes or ooaaue areas F B C M > Sum to laboratory identification criteria observed. •Unuaed portion For chrTsotlle: 0.73nm apacinr for (020) rsnocUoni. of niter Chrysotile a.53nm spacini for the layer line repeat, streaking 'Avoided portion of (110) and (130) reflecLions. of niter For arnphibolea: 0.S3nm layer line repeat, and approx. (2mm Vida) 3.5 ratio of non—twinned layer line spot apeeing to Amphibole layer line repeat distance (O.SSnm). v/= EDS spectrum conforming to laboratory Ambiguous identification criteria observed. AMPHIBOLES pss single Fiber (1-3 inLersections = 1-3 fibers) Amosite 0= Bundle (>3 fibers <1 fiber diameter apart) '____________ 25mro filter Crocidolite Non-asbestos «= SX'S’ I--------- 1 suppin. Rule.: I--------- Anthophyllite NSD= No Structuro. DeUcUd | >8° </C.Q. or Io l.t 4 C.O. j Tremolite Actinolite Non-Identified k\OATA\PBIVA're\lllKEC\CAnD'J-ERa 9/22/86

CITY_21MC100_003099992

NYC-WTC_000182610