Fax cover sheet, 105 Duane Street site file

NYC 9/11 Public Portal Document

(Page 5 of 7)

DEC-12-2001 i7: 7 Nif

dust contaamir'ation of building The ASTM method is intended for guidance on examining no suggesaon surfaces and 1s intended as a general assessment of the building. Thor* is from asbestos in the ASTM method that it can be used to assess general health risk exposure. nor does it suggest that all budding surfaces be mainQained to the levels the published in the standard. The method is genes 11y applicable for the es irriate of 1000 fibers per concentration of asbestos fibers on surfaces starting from approxlmattIY square eearimeter (f/em2)

to determine On December 3M two surface dust samples were t ken from the 1& floor asbestos whether asbestos fibers were settled on stvf ocs. The results are reported in fibers per square oendmeter of surface tested. The following smmnwizes the sample results:

Sau,plc Cd20204 sampled in living room from able top Result- 740 asbestos 8t:uatutse per square cemtim*tet

Samp10 E12O3-2 sampled from supply air diffuser in the 10* floor public hallway. Result -550000 asbestos atnicttlre8 per square centimeter

asbestos fibers The supply air guile in the hallway was found to have elevated levels of well above the zeootttmeaclad limit of 1000 strucanes per square centimeter. This atlggcsta that the ventilation system was votminsted by asbestos when the building collapsed.

using The duct system should be deemed by a professional duct cleaning company vacuum and cleaning equipment designed fQr asbestos deoantaaaiaatLOD.

Si y~

Edward Olmsted

12/11/01 TUB 14:06 ITX/91 Nn AARAI Vhnnh DEC-12-2001 1721 1212 637 3561 P.05 LWNYC0308310

NYC-WTC 000125805