Document b54DOm8v5YXb0y1vjpDo5EXqZ

Beil Laboratories 600 Mountain Avenue Murray Hill, New Jersey 07974 Phone (201)582-3000 July 16, 1979 Mr. Walt Tripp Hew Jersey Bell Telephone Company 540 Broad Street, Room 502 Newark, NJ Dear Walt: The air filters and ins.ulation sample have been analyzed for asbestos. The only crystalline material noted in the insulation sample labelled "650 Park Ave. E Orange Wall Surface Air Cond Room" was some form of an amphibole. When examined by polarized light microscopy and dispersion staining many nonbirefingent fibers (probably fibrous glass) as well an many asbestiform fibers were noted. These asbestiform fibers had all the optical characteristics of amosite - one of the amphibole asbestoses. Based on the presence of an amphibole mineral and the asbestiform fibers this sample contains asbestos. All air filters were analyzed by counting all fibers greater than 5 pm long seen by phase contrast optical microscopy at 400X. These are the methods 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 Fibers/< 1-1-6-14-79 2-2-6-14-79 3-3-6-14-79 4-4-6-14-79 Room LC16F 2-6-7-14-79 3-7-6-14-79 4-8-6-14-79 200 200 200 200 200 200 200 200 3 6 5 7 18 3 2 3 .01 .02 .02 .03 .07 .01 .01 .01 * 100 microscope fields (.011 mm2 /field) were counted. 2 The filter area was 855 mm . 5ENTIAL 003766 Mr. Walt Tripp - 2 If you have any further questions about this analysis please let me know. MH-7885-CPL-ecb Ref. 1039 Copy to R. L. Beach ** AT&T Charles P. Lichtenwalner R. W. Stone, M.D. G. P. Bisgeier, M.D. - NJB A. B. Goetze W. J. Schreibeis - BTL G. M. Wilkening . CONFIDENTIAL 003767