Ambient air sampling report for 105 Duane Street, Feb 2002

NYC 9/11 Public Portal Document

I ATC ASSOCIATES INC. - TEM ANALYSIS I LAB GROUP It: 5762 - 10/25/01 Filter Type MCE 25 mm Operator lip Lab Sample No. 62218 Client Spl. No. 4 Filter Area 385 mm"2 I Instrument Z.D. EM 10 CRX Grid I.D. Disk No. Comments Screen Magnification 16,400X (GO) Area 0.01124 mm2

80 kV No. GO to be Analyzed 6 ( 4.721 Struct. Corspd. to 70 s/mm"2.) Acc. Voltage

I GO. Structure structure Type Length I.D. of Structure EDS N or,/ (Nonasb. No Coord. No. X0.5 um F B C M 1 Chrys. Amphibole Nonasb. Ambig./ND Elements)

1 ii I I I I

I I - Photo No. (from 1 in 5 asbestos- containing samples) Identify all structures using EDS IGrid accept.ance:I Check diffraction for ast structures u to 70s iir on (Let 4) Store all unrepeated spectra

StrucL = > 0.5um & > 5:1 Aspect Ratio <50% undissolved r, overlapped or foldecI Totals I articulate coverage >50% coverage N= Not Observed (BDS spectrumordlffracUon pattern) 20 unfolded or overlapped grid squares Positive diffraction patters properties conforming Mine Oropaque gross to laboratory Identification criteria observed. Unud se portion For ehrysettle: 0.70nm .pafitng for (020) reflections. of lter Chr sotile 0.01nm spacing for the later lino repeat, streaking y of 1110) and (190) refie.tioaa. ed portion ter For amphibole.: 0.03m Layer line repeat, and filter wide) 9.5 ratio of non-twinned Layer line spot spacing to Amphibole layer lies repeat distance (0.59nm). EDS ng to tory I ntificati n criteriaobservved`~ ro AMPHIBOLES Ambiguous Fa Single Fiber (1-3 intersections = 1-3 fibers) site B= Bundle >9 fibers <1 fi ber diameter apart) appros.(e:22mm filter Crocidolite Non —asbestos Cluster >9 intersection.) CoMatr BtePPI=a Rule.: Anthophyllite NSD= No Structures Detected >5o 5/0.0. or in let 4 c.o. Tremolite Non -Identified

NYC-WTC 000104096