Document rp6w6yxLdjnowjZyxOQbezb87

subject: Asbestos Survey - New Jersey Bell Telephone Co., Central Office (Pleasantville, N. J.) Case: 48106-3 Ref.: 1740 Bel! Laboratories <tete: July 28, 1983 p. Huggins MH 78691 1F-110, X7927 MEMORANDUM FOR RECORD On July 22, 1983, a survey was conducted at the New Jersey Bell Telephone Company Central Office facility (423 Wash ington Avenue, Pleasantville, N. J.)-. Sampling was conducted to identifv building materials containing asbestos and air borne fiber concentrations at various building locations. This survey was requested by Mr. D. McCartney, Associate Staff Manager Safety, New Jersey Bell Telephone Co. in response to employee concerns regarding potential asbestos exposure within the building. Conclusions and Recommendations - All fiber concentrations measured during this survey are below applicable Occupational Safety and Health Adminis tration (OSHA) exposure standards. - Employees should be informed of the results of this survey. - The asbestos containing insulation in the "Old Air Handling Room" should be repaired and maintained as required to insure this material is kept intact. - Signs should be posted in the "Old Air Handling Room" indicating the insulation contains asbestos. Materials and Methods Air sampling and filter analysis were conducted in accor dance with National Institute for Occupational Safety & Health (NIOSH) methodology (NIOSH P&CAM 239) - "Asbestos Fibers in Air"). SamDling was performed using DuPont Model P2000, Bendix Model HD 55 and MSA Model G personal CONFIDENTIAL 003754 2 sampling pumps and 0.8ym mixed cellulose ester filters (Miilipore Corp). Pumps were operated at a flow rate of approximately 2.0 liters per minute(LPM)and calibrated before and after sampling using a Gilmont precision rota meter (No. B9165). Filter analyses was conducted by sizing and counting fibers using a phase contrast microscope. All fibers which have a physical dimension longer than 5 micro meters (ym) and a length to diameter ratio of 3 to 1 or greatei, were counted. Bulk samples were collected in glass vials and analyzed by polarized light microscopy using dispersion staining tech niques. This method permits identification of fibers with optical and morphological characteristics of asbestos fibers. Results Source of bulk samples collected in the "Old Air Handling Room" are listed below: - AC 1-1, discharge duct - AC 2-5, top surface - AC 2-4, rear, top of unit - AC 2-4, outside air duct. All of these samples were found to contain chrysotile asbestos. A sample of insulation was also collected from an air supply duct in the ceiling of the cafeteria. This sample contained mineral wool; no asbestos was present. Results of air sampling data are listed in Table 1. Air borne fiber concentrations ranged from 0.001 to 0.016 fibers per cubic centimeter (fibers/cnP). Discussion Airborne fiber concentrations (Table 1) at all indoor sampling locations ranged from 0.002 to 0.011 fibers/cm3. Concentra tions in outside air were 0.01 and 0.016 fibers/cm3. The Occupational Safety and Health Administration (OSHA) per missible exposure limit for asbestos is 2 fibers/cm3. The effective OSHA action level (AL) for asbestos is 0.1 fibers/cm3. All concentrations measured are well below the OSHA PEL rmd AL. In addition airborne fiber concentrations indoors .-ire generally lower than those measured for outside air. The insulation covering all air handling units, dis charge ducts and supply ducts in the "Old Air Handling Room" was found to contain chrysotile asbest-s. This insulation is covered on the outer surface 'ey a paint layer layer however mhis protective coat has been CONFIDENTIAL 003755 3 disturbed at a number of sites, leaving the underlying asbestos insulation loose and friable. Disturbed sites should be repaired and the area maintained to ensure the insulation coating is kept intact. Employees involved in work in this area, requiring handling or disturbing insulation material, should be required to utilize con trols and to use adequate protective equipment. Wetting the insulation prior to handling is recommended. Signs should be posted indicating the insulation material con tains asbestos. Copy to D. D. McCartney - NJB fl_ P,. rinptr.p R. W. Stone, M. D. W. J. Schreibeis K. D. Tait G. M. Wilkening 003756 * c-- oH oo M "X iH iH CN m <N ro in o VO o to O Ooo o o iH 4U4 5O4J O O o o o o o O o C0) X-HI O O o o o o o O o O Em o u C o n ce n tra tio n s re p o rte d are co rre cte d fo r b la n k . . 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