NYC-WTC_000182601

NYC 9/11 Public Portal Document

ATC ASSOCIATES INC. TEM ANALYSIS LAS GROUP #: 5775 - 10/26/01 Lab Sample No. 62373 Filter Type MCE 25 mtn Operator Al ' '<7^ Client Spl. No, 12 Filter Area 385 mm"'2 Instrument I.D. SM 10 CRX Grid I.D. Disk No. Screen Magnif icacion 16,4CH3X- (GO) Area 0.01124 nnn*2 Comments Acc. Voltage 8 0 kV No. GO to be Analyzed 4 ( 3.147 Strucc. Corspd. to 70 s/mm*2.)

GO. Structure Slruclure Type Length I.D. of Structure N or EDS >0.5 um (Nonasb. No Coord. No. F B C M Sum Chrys Amphibole Nonasb. Ambig./ND Elements) < 5 um /

-3

Photo No. (from 1 in 5 asbestos— Identify all structures using EDS Checkc _________ diffraction for ___ aabestoB Store all unrepeated spectra containing samples) Grid acceptance:! structures up to TOs/i^in' (l>t 4) Struct. = > O.Sum ie > 5:1 Aspect Ratio <S0X undiasolvea filler, overlapped or foldea <10X particulate coverage >50X coverage Na Not Observed (BDS spectrum or diffraction pattern) at least 20 unfolded or overlapped grid squares Totals <5% holes or opaque areas F B C M > Sum Positive diffraction pattern properties conforming to laboratory Identification criteria observed. •Unused portion Par chrysotile: O.TSnm spaelnt for (020) raflectlone. of filter Chrysotile 0.83nm spacing for the layer line repeat, aLroaklng 'Avoided portion of (110) and (lao) reflections. of niUr Per smphlbolei; 0.53nm layer line repeat, and approx. Portion of filler (Smin wide) 3.5 ratio of non-lwinned layer line spot apaclng to ■ubject to oxemination Amphibole layer Une repeat distance (O.S3nm). v/= EDS spectrum conforming to laboratory Ambiguous Identification criteria observed. AMPHIBOLES F= Single Fiber (1-3 Intersections = 1-3 fibers) Amosite B= Bundle (>3 fibers <1 fiber diameter apart) 25mm filter Crocidolite Non-asbestos C= Cluster (>3 intersections) Mb Matrix NSD= No Structures Detected L:\DATA\PRlVATE\XJKSC\CADD\7EMfl 9/22/88 c -J stopping Rules; >50 a/C.O. or in 1st 4 C.O. . Anthophyllite Tremolite Actinolite Non-ldentified

CITY_21MC100_003099863

NYC-WTC_000182601