Ambient air sampling report for 105 Duane Street, Feb 2002

NYC 9/11 Public Portal Document

ATC ASSOCIATES INC. - TEM ANALYSIS I Lab Sample No.

Client Sol. No 52530

14 LAB GROUP #! 5"69 - 10/26/01

riper Type CE 25 mm

Filter Area 395 mm3 Gperat::r / ` \

I Instrument I.D. EM 1) CRX

Screen Magnification 16 400X

Acc. Voltage 90 kV Grid I.D.

(GO) Area C 0.01124 mm"3

No. GO to be Analyzed 6 Disk No.

Comments

4.711 Str.:cc sod "'0

Length I.D. of Structure EDS GO. Structure Structure Type N or,/ (Nonasb. No Coord. No. F B C M >. Sum Chr s. Amphibole Nonasb. Ambig./ND Elements)

I3 _—

I Li I I Li I I r1 I I Photo No. (from I in 5 asbestos- Identify all structures ueina using DS Check diffraction for asbestos Store all unrepeaLed spectra-) containing samples) Grid acceptance: structures up to 70a ettm (1st 4) <50% undiaeolve er. over apps or[aided StrucL = 0.5um & > 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 <5% holes or opaque areas r 0 L m jr Juut Positive diffraction pattern properties conforming

I to laboratory identification criteria observed. For ehryseUle: 0.73cm spsain` for (020) reflections. 0.53am spacing for the layer Ina repeat, stressing of (110) and (150) reflections. For ampbibales: 0.53nm layer line repeat. and approx. Portion of filter subject b Unused portion of filter Avmded portion of filter (2mm side) Chrysotile

Amphibole I i

3.5 ra tio of man-twinned layer line spat spacing to examination layer line repeat distance (0.35nm). EDS spectrum conforming to laboratory AMPHIBOLES Ambiguous identification criteria observed. P= Single Fiber (1-3 Intersections = 1-3 fibers) Amosite 1= Bundle (>3 flben <1 fiber diameter apart) 20mm filter Crocidolite Non —asbestos C= Cluster (>3 intersections) Stepping Rules: Anthophyllite >50 a/G.O. or in lot 4 00. Tremolite NSD= alloi Structures Detected Actinolite I Non —Identified L•\DATA\PRIYATE\XIXEG\r«IDD' EY3 9/22/98

NYC-WTC 000104281