Document 3JKVoO1N7woe38n6wqeX3b4wn

Bell Laboratories SDQ Mountain A .%nue Murray Hih, N*r/< Jsrsay 0/974 Phone (201)5c; 2000 April 10, 1979 N. E. Wood New York Telephone 1095 Avenue of the Americas Tew York, NY 10036 Dear Norm: The three air filter casettes and bulk insulation sample you sent with your letter of March 19 have been analyzed for asbestos. An x-ray diffraction scan of the insulation sample labelled "50 Varick St. 8 FI. 3-16-79" found chrysotile, brucite and calcite as the major crystalline materials present. An optical examination revealed many fine birefrfngent fibers. The presence of crysotile along with birefringent fibers means this material contains asbestos. For the air filters all fibers greater than 5 pm long seen by phase contrast optical microscopy at 400x were counted. This is the method recommended by the National Institute of Occupational Safety and Health (NIOSH). Based on your sampling data and the microscopy counts the results were: Sample Volume Air (L) Fibers Counted* Uncorecte^ fibers/cm Clank Corrected fibers/cn -1 50 Varick St 154 10 .05 .02 2 50 Varick St 200 5 .02 <.01** 3 lank --7 -- -- 2 100 Microscope ,fields (..Ollinm /field) were counted. area wa?- 353m.- The filter < = lesi, than CONFIDENTIAL 003779 li. Wood - 2 If you have any questions about this analysis please let me know. C.G` c2K.( C. P. Lichtenwalner re f: 1C05 copy to P. H. Stark - NYT C. H. Steinxneltz, K.D. R. L. Beach - ATT N. J. DeCapua J. M. Degen R. W. Stone, H.D. W. J. Schreibeis G. rf. Wilkenir.g CONFIDEN* T' '?' *ai i? 00378C