Ambient air sampling report for 105 Duane Street, Feb 2002

NYC 9/11 Public Portal Document

ATC ASSOCIATES INC. - TEM ANALYSIS ' LAS GROUP 4: 5759 -

Lab Sample N . 67.514 Filter Type MCE 25 mm operatcr L I

Client Spl. No. 09 Filter Area 395 mm"2 Instrument I.D. EM 10 CRY Grid I.D. c? C Disk No.

Screen Magnification 16,400X (GO', Area 0.01124 mm^2 Comments

Acc. Voltage 80 kV No. GO to be Analyzed G l 4. 7 Struct. 7crsnd. rc 70 a mr ^2

EDS GO. Structure Structure Type! Length I.D. of Structure N or/ (Nonasb. No Coord. No. >°s um > 5um F B C M < 5um! Chrys. Amphibole Nonasb. Ambig./ND Elements) l c2 //~~ ,ter .7 ` '<?

I I I

I I I A Photo No. (from 1 in 5 asbestos- Identify all structures uain EDS Check diffraction for asbestos Store all unrepeated spectra

1 containing samples) Struct. = > 0.5um & > 51 Aspect Ratio Crtd acceptance: <50% undieaoi,e <1(1% particulate i er, structures u to 70e Aram (1st 4)

coverage o,orappe or a cc >50% coverage N= Not Observed (EDS spectrum or diffraction pattern) lat. least 20 unfolded or overlapped grid squares <5% holes or opaque areas Totals

Positive diffraction pattern properties conforming to laboratory identification criteria observed. Unused portion For ehrysoUle: 0,73nm apaaing far (0201 reflections, of tutor Chryso tile 0.33nm spacias far the Mayer line repeal streaking Avoided portion of (110) and (130) reflection.. of filter For amphiboles: 0A3am layer line repeal and appras. Portion of filter (2mm aide) 0.5 ratio of non—twinned layer line spot spacing to sub)act m Amphibole layer line repeat distance (0.33nm1. esaminatlon

EDS spectrum conforming to laboratory Ambiguous Identification criteria observed. AAfPHIHOLES F= Single Fiber (1-3 intersections = 1-3 liberal Amoalte 8= Bundle (>3 fibers <1 fiber diameter apart) 25mm filter Crocidolite Non —asbestos C= Cluster (>3 Intersection.) , Stopping Rule,: Anthophyllite I NS Matrix >aD ./c.D. or In I.t 4 c.D. Tremolite N30= No Structures Detected Nan -Identified Actinolite L\DATA\PRIVATE\YIKEC\CADO\TEY3 9/22/98

NYC-WTC 000104275