Ambient air sampling report for 105 Duane Street, Feb 2002

NYC 9/11 Public Portal Document

ATC ASSOCIATES INC. - TEM ANALYSIS LAB GROUP 8 5759 - _I) ^,:: _

Lab Sample No. 62534 . _aer Type MC_ 25 mm Operator

Client Soi No 29 F:.___r ~ Area 395 mm"-

Instrument ..D. EM 10 _ Or:d-:.2. ltae NO

Screen Magni(icacion 16,400. (GO 1 Area 7. )112 4 mm ^ 2 Commend

Acc Voicage 80 kV No. GO to be Anai,,ced j 4.721 Strut=. Corscd. no '0 S mm^C

GO. Structure ; structara Type Length I.D. of Structure N orv~ (Nonasb. No Coord. No. F B C M >/ 5um Chrys. Amphibole Nonasb. ~Ambig./ND Eletnen )

G /

Photo No. (from 1 in 5 asbestos- Identify all structures using EDS Check diffraction for asbestos Store all unrepeated spectra containing samples) f acceptonceTJ structures up to 70s &eim (lot 4) <50% undissolve t er, overappe or ai e 7 Struct. _ > D.Sum & > 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 _ Positive diffraction pattern properties conforming <5% holes or opaque area, F B C M > 5um to laboratory Identification criteria observed. Unused portion For eheyeUle: 0.73nm ,racing for (020) reflections. at (liter Chrysotile 0.37nm spacing for thelayer line repeal elresicing Avoided portion of (110) end (130) reflection.. of filter For amphiboles 0.37nm layer line repeal and apprux Portion of filter (2mm ►Ids) 5.5 ratio of non-twinned layer line spot spacingm subject le aeamsnauan Amphibole layer line repeat distance (0.33nm). ✓= 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) Stepping Rule.:- AnLhophyllite M= Matrix NSD= No Structures Detected >50 s/G.O. or In let 4 C.D. Tremolite Yon —Identified Actinoiite L\DATA\FRIVATE\MIKEG\CADD\TEM3 9/22/98

NYC-WTC 000104295