Document yp119KzL0bxmYkmp80LqGxZ73

Air Filter and Bulk Insulation Analysis for Asbestos Case #48106-3 v, * *. r Bell Laboratories 600 Mountain Avenue Murray Hill, New jersey 07S74 Phone (201) 582-3000 March 6, 1979 Messrs: P. Costa R. Wenz New York Telephone Company Dear Phil Ralph: The two bulk insulation samples and four filter casettes you collected at 120 Hicksville Road, Massapequa have been analyzed for asbestos. The two bulk insulation samples labelled "#1 and #2 Basement 120 Hicksville Road Massapequa" gave identical results. An x-ray diffraction scan of the samples revealed the major crystalline material present was chrvsotile. An optical exan. ration showred many asbestiform birefringent fibers. The presence of fibers and the chrysotile crystalline structure means this material contains asbestos. The four filters were analyzed by counting all fibers greater than 5 um long seen by phase contrast optical microscopy at 400x. This is the method recommended by the National Institute of Occupational Safety and Health rNI0SH). Based on the optical counts and your sampling data the results were: Fibers , Sample Volume Air (L) Counted* Fibers/cm #1 Pump#l Basement 120 Hicksville Rd 120 4 .03 #1 Pump#2 120 Hicksville Rd 120 2 .01 #3 Pump"l 120 Hicksville Rd 120 18 .12 Blank** 10 *> * 100 Microscope fields (.011 mnT/field) were counted. filter area was S55 mm". The CONFIDENTIAL 003781 2 ** This filter was bent, torn and very damaged. Optical count results may be unreliable. If you have any questions about this analysis please let me know. MH-7885-CPL-djh C. P. Lichtenwalner Copy to C. H. Steinmetz, M.D. P. H. Stark - NYT R. L. Beach - ATT N. J. DeCapua^- J. M. Degen R. W. Stone, M.D. - NYT W. J. Schreibeis G. M. Wilkening 003782