Document pejVMNGQJoe0NBm8gGz1zpmVD

J-M Manufacturing Company, Inc. To. T. E. Lohman- Denison Internal Correspondence Date: November 13, 1984 From: e . E. Wang- Stockton HQ c.Copies: J. Chen- Stockton HQ Subject: INDUSTRIAL HYGIENE SURVEY RESULT The industrial hygiene survey of your plant, conducted in September, 1984, has indicated that one silica sample was in excess of the Permissible Exposure Limit (PEL) of 2.1 mg/MJ (at SiOg content = 2.66 wt.%), and two asbestos samples were in excess of the proposed new OSHA Standard of 0.5 f/cc. The' details are given below: 1. Silica: Operator: UPL Helper, R. Hesse Respirable Silica Dust: 2.3 mg/M3 2. Asbestos: . Operator: a. Large Sampling Cut-Off, B. Ross b. 13-ft Head Curer, P. Morrison Airborne Asbestos Fibers: 0.57 f/cc 0.71 f/cc 3 The airborne silica concentration (2.3 mg/M ) was only slightly higher than the PEL'S value of 2.1 mg/M . Take into account the experimental errors involved, there is essentially no significant difference between 2.3 mg/M"5 and 2.1 mg/M. Thus, no resampling work is recommended at this time. Although, two asbestos samples were in excess of the proposed Standard of 0.5 f/cc, they were below the current PEL'S value of 2.0 f/cc. To improve the situation, I would like to recommend the following: 1. Check and improve the local exhaust ventilation conditions and its efficiency. 2. Examine work practices, such as any wrong doings? improper procedures? dust spills cleaned-up promptly? NOV. 1 3 1984 D 003365 SC-JMM-2730 Page 2 3. Check to see if the deposited dusts were cleaned-up by vacuum or wet cleaning, but NOT by compressed air. 4. To be on the safe side, operators are required to wear proper respirators during work hours. The above mentioned three samples were the only samples that were exceeding the current or the proposed PEL'S. All the rest samples ("noise" excluded) were below the PEL'S values. The detailed written report is not available yet at this time. . You will receive a copy when it becomes available in the future. D 003366