NYC-WTC_000188668

NYC 9/11 Public Portal Document

ATC ASSOCIATES INC. TEM ANALYSIS LAB GROUP # 10/13/01 Lab Sample No. 61642 Filter Type MCE 2E mm Operator Client; Spl. Nc. 10 Filter Area 38E mm Instrument I.D. EM IC CRX Grid I-D. 5^^ A/ Disk No. Screen Magnification 16,400X (GO’ Area 0.01124 mm"2 Comments Acc. Voltage 80 kV Nc. GO to be Analyzed _4 3.14'7 Struct. Corspd. no TO 5/mm"2.)

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

Photo No. (from 1 in 5 asbeatoa— identify all atructurea uaing EPS Check diffraction for asbeatoa Store all unrepeated apectra— containing samples) Grid acceptance:! atructurea up to 70s/&ni (l»t 4) <50% undiaaolved filter, overlapped or folded Struct, s > 0.5um & > 5:1 Aspect Ratio N= Not Observed (EDS spectrum or diffrsction pattern) <10% particulate coverage >50% coverage at least 20 unfolded or overlapped grid squares Totals Positive diffraction pattern properties conforming <5% holes or opaque areas F B C M > 5um to laboratory idenUfication criteria observed. •Unuked portion Par chrykolllB: 0.7anm spacing for (020) rwriectlona. of filter Chrysotile Q.53nm spacing for the layer line repeal, streaking .voided portion of (110) and (130) reflecUons. of filler Por amphiboles: O.S3nm layer Une repeat, and approx. Portion of filter (Smm wide) 3.5 ratio of nen-lwinned layer line spot apaeing to •ubject to examination Amphibole layer line repeal distance (Q.Mnm). EDS spectrum conforming to laboratory identification criteria observed. AMPHIBOLES Ambiguous P= Single Fiber (1-3 interaectiona = 1—3 fibers) Amosite 0= Bundle (>3 fibers <1 fiber diameter apart) C= Cluster (>3 Intersections) SSmni filter Crocidolite Non—asbestos J stopping Rules; I--------- - Anthophyllite M- Matrix NSD= Nq Structures Detected L:\DATA\PRlVATr\MlKEC\ CADOXTEMO [ >50 »/C.O. or tn lat 4 G.O. B/22/«a Tremolite Actinolite Non-Identified

CITY_21MC100_003082337

NYC-WTC_000188668