Document 3QLZg96RzaOXyYqvYbrqBEQB0

E. I. ou Pont oe Nemours 5 Company Wilmington. OrukWAnc twae CMOIMreitlNa OCPARTMCNT ^ / ri May 2, 1968 06FN0ANr J EXHIBIT 1 fypQ/izJ kMui;' .The following procedure was issued on April 5, 1968, to Du Pont's Field Project Managers at its various Construction sites. SAFETY - DUST CONTROL In order to assure atmospheric conditions in insulation fabrication shops which will not contribute to the employees' health problems when working with asbestos fiber-containing materials, the Construetion Division is initiating the following permanent air quality control program to be effective June 1, 1968. * Air Monitoring Environmental air monitoring shall be conducted to provide quanti tative data for site evaluation of dust control efficiency and assure conformance with established Threshold Limit Values (TLV). 1. The Threshold Limit Value for total dust count shall be 500,000 particles per cubic ft. of air. i 2. Personnel monitoring will be conducted in the insulation shops on site locations. One employee will be requested to wear the air sampler one eight-hour day each month. 3. Trained site safety personnel shall be responsible C<fr the control, operation and adjustment of the air sampling - instrument, recording required technical data associated with the air sample, mailing of air sample to laboratory for analysis and compiling records of analysis reports. . 4. When soliciting participation in the air monitoring program, craft supervision and Safety Engineer should anticipate who will be involved in work which will produce the greatest oust exposure for what day of that month. 137 DUP 0900987 CTTCR TMIMOS roft BrrrK UVtNO ...TMAOU6M CMCMISntY SC-DP-02350 -2- 3 of y Air Konitorinr. (Continued): 5* The personnel air sampling instrument used shall be a Universal Industrial Equipment Co., Millipore filter Model LL03 (qualified for* explosion hazard areas) air sampler. The filter used shall be an .8 micron pore size, Millipore Cat. No. MAWG O37 AO, Type AA, in plastic holder. This equipment will be assigned to the sites where air monitoring is required by the Division Safety Office. 6. The filter in plastic holder, upon completion of air sampling, shall be nailed by the site Safety Engineer to Morton Corn, Ph.D., Graduate School of Public Health, University of Pittsburgh, Pittsburgh, Pennsylvania 15213, attention Felix Stein. A phase microscopy analysis of submitted sample will be made and a report submitted to the site and the Division Safety Office indicating: (a) fibers below 5 micron length, (b) fibers above 5 micron length, and (c) total number of particles. Reports indicating total particle count to be ap proaching or above the TLV will require determining cause of condition and taking corrective action to reduce particle count. After improvement has been applied, a second eight-hour sample shall be con- .. ducted, analyzed and documented. Atmoscheric Dust Control The application of the following recommendations should demonstrate conformance with the established .dust TLV and provide effective * dust emission control. 1. Materials containing Crocidolite asbestos fiber shall not be purchased or accepted for use. Materials containing Chrysotile and Amosite asbestos fibers are acceptable for use. 2. The pressure spray application of materials with any per cent of asbestos fiber content shall be eliminated. 3* All power tool and equipment operations shall be isolated . from other shop facilities and fabricating operations. DUP 0900988 ,r c c, Atmospheric Dust Control (continued): Vof / i*.. All power shop equipment `hall, when operated, have installed exhaust ventilation of sufficient capacity to remove dust particles at point of origin. Exhausted dust particles shall be ctllected by an effective col lector system which will r.ot allow, vent-off of dust - particles to the atmosphere. 5. Present controlled shop cleanliness programs shall be expanded. A vacuum clear.-cr should bo used in lieu of broom sweeping to remove bust particles from shop equipment work tables, ledges, floors, etc. 6. A controlled materials handling program should be adopted to eliminate theemiosion of dust; for example, when opening and removing materials from shipping cartons or in the handling and mixing of asbestos cements. " Respiratory Protection . Severe or isolated condition? may require that respiratory protective devices be used. Consideration should be made for adequate protection of people in adjacent areas to the { work location producing this condition. A supplied air _ respirator or a filter respirator manufactured by Mine *" Safety Appliance Co., Pittsburgh, Pa., Model Dustfoe 77., with filter number BM 21 B-5" should be used. :' ' Your usual cooperation is anticipated in administering these dust controls. . . CONSTRUCTION DIVISION /S/ K. E. Keuper Division Safety Superintendent / DUP 0900989