Document 0qqD2mz9Z4MBXV4JjX4ggd1RO

FILE NAME DuPont DUP DATE 1967 Dec 21 DOC DUP158 DOCUMENT DESCRIPTION Memo to F.H. Mackie from K.E. Keuper RE Dust Exposure - Survey Results and Policy Recommendations CC B. B. Lewis December 21 1967 TO F. H. MACKIE FROM K. E. KEUPER --"--,-- DUST EXPOSURE - SURVEY RESULTS AND POLICY RECOMMENDATIONS We recently concluded the asbestos dust survey which was conducted at Chambers Works Construction over the The survey was performed under the guidance of A. past year L. Medical Section Chambers Works Plant Linch Results of the environmental survey show that employees are being exposed to a total dust particle count that does not | exceed 1 per cent of the current Threshold Limit Value TLV ; established for asbestos dust by the American Conference of Governmental Industrial Hygienists These results were obtained in shops where designed ventilation systems were installed on all power equipment and a controlled cleanliness program existed The total particle count is many orders of pmeargnicutbuidce lfeosots ftohranastbheesteosstadbluissthed TLV of 5,000,000 particles - The acquired results would indicate that have a problem of concern presently we do not legislation However Federal and State enacted over the past few years has placed burden of proof for continuous conformance on the with legislation employer the In view of this responsibility and trends in established TLV's sation claims it becomes imperative that decisions of compen- an effective industrial hygiene program be adopted The need for such a program becomes faocrutethewheenmpleomyepelsoyment medical examinations are not required : a isc isc ; 110 | 19 19 p> -- > 001301 001301 001301 001301 ... IN . F. H. Mackie December 21 ~ 1967 With the above mentioned responsibility in mind the survey results would indicate that a permanent quality control program be initiated to provide not only quantitative data for internal ' evaluation of dust control efficiency but also to document air quality analysis needed to demonstrate conformance with established TLV's and provide effective defense in litigation cases Environmental monitoring once a month should suffice for general work areas If circumstances should arise which involve unusual dust generation special monitoring will be required to evaluate the potential exposure severity Equipment performance and ventilation specifications should be established for effective dust emission control Work procedures and protective equipment requirements also should be initiated ' We request that you consider adopting the following recommendations to be applied all site locations to acquire satisfactory environ- ments from dust exposure . 1 Maintain an air sampling program with documented results This is essential for the over health exposure and possible litigation suits Perform random personnel sampling - on a frequency of once a month at each field shop location where there is knowledgeof exposure to asbestos dust The site Safety Supervisor should be responsible for acquiring the air sample and all technical information associated with the sample Arrangements can be made through Dr. Zapp Director Haskell Laboratory for a qualified interpretation of the sample location Results should then be documented at each site To acquire the sample the following instrument is recommended Mighty Air Sampler - Unico Model 440 with microimpinger The approximate cost of the instrument is 180.00 Equipment & Isolate power equipment operations in the shops from other shop facilities b Install exhaust ventilation on all power equipment to remove dust particles at point of origin and maintain atmosphere total dust count below the . Threshold Limit Value of 5,000,000 particles per a cubic foot All possible dust from cutting and effective shaping functions should be collected by an effective exhaust and collector system Collector should not vent off collected dust particles to the atmosphere 001302 001302 001302 001302 001302 001302 3 P. H. Mackle December 21 1967 3 Applied Methods In Working With Materials a. a a oo Initiate a controlled shop cleanliness program Use a vacuum to remove dust particles from shop equipment work tables ledges floors etc. Hand cutting should be done so that wherever possible scrap and dust particles fall into a container b Open cartonosf material with care Dust is shaken loose from shipping abuse and is one of the most severe sources of asbestos dust quantities with which we are presented The carton can be vacuumed prior . to opening by cutting a hole in the carton and introducing a vacuum hose C. Asbestos cements must be handled with great care A system to avoid man handling and mixing by hand is beneficial This may be accomplished by procurement of the cement in small plastic bags where water may be introduced and the cement kneaded without dust exposure d The spray application of materials containing asbestos fiber should be prevented Several states have enacted legislation outlawing this application of Limpit insulating material . 4. Smoking should be prohibited in shops with asbestos dust exposure and when operating tools and equipment performing work which produces dust 5. Respiratory Protection Severe conditions may dictate the need for respiratory protective devices However every attempt should be made to avoid these devices since they never adequately protect the people in adjacent areas Respiratory protective devices are when required an admission of a problem Since the law accepts even a casual exposure as hazardous the environment should be maintained so that protective respiratory devices can be avoided Approximate cost of survey - 2200.00 Equipment Purchased 330.00 Sample interpretation at 10.00 per . 1870.00 Dr. R. J. Manella - University of Pittsburgh 001303001303 001303 001303 001303 001303 yy SS t ig A _ 4 - *