Document YjjXLp0oO555rw05mOyNzvj0D

BfeMMKaBjataaytt;feai gJHHHlMLUuiiiiMu LiiaMlsaaiit.iist Jaiiai. let* E. I. du Pont dc Ncmovirs & Company Wilmington. Oclawans mm : J. . Cueer.er, Employee Rel.,Nemours 3. J.Stopps.M.D. .Employee Eel. ,Haske E.C.Jones,Purchasing,Louviers F.H.Mackie.Engg. Constr.,Louviers B.B.Lewis, " H.D.Boyce, " J. C. Lang, '' R.K.Mason, n W.C.Weaver, 1" "G.L.Dorsch, " '" R.J.Ham, " " C.J.Lawrence,Jr. " " W.H.Zane,Engg. Design,Louviers J.R.Allen,Engg.,ESD,Louviers Site Safety Supervisor, Constr. FFIIEELLDD PROJECT MANAGERS p. w. n w BAYLIS, BRIGGS, ASHTABULA BEAUMONT J. J.' BELL, BREVARD A. D. DAY, CAPE FEAR C. S. ANDERSON, CHAMBERS WORKS W. S. FREE, CHATTANOOGA H. S. STANTON, JR., CIRCLEVILLE W. C-. HARRIS, COLUMBUS SHOPS M. w. HARTNETT, JR., EAST CHICAGO W. r* MANNEAR, FLORENCE K. G. CAUGHMAN, JR., HOUSTON R. H. DAVIS, KINSTON R. G. STERNBERGER, LOUISVILLE J. K. ADDISON, MARTINSVILLE W. A. SAMANS, MAY A. S. TRUMPOP.E, MEMPHIS W. BLAKE, MOBERLY H. F. REDMILE, OLD HICKORY W. S. LEWIN, PARLIN F. H. FOWLER, AFPM, PONTCHARTRAIN E. M. VASS, SABINE RIVER H. J. FEINEN, SAVANNAH RIVER E. K. DRAWDY, SEAFORD R. A. MINIARD, SPRUANCE S. V. HINSON, VICTORIA R. L. SPITZ, WASHINGTON WORKS S. KREWATCH, WAYNES30R0 G. E. BARLOW, JR., WILM. AREA J. R. BALDER, MGR., WILM. SHOPS SAFETY - DUST CONTROL Industrial work producing airborne dust particle contamination is recognized as a primary contributor to employee health problems. The ability of the medical profession in identifying the personal respiratory disease of asbestosis, and the establishing of the cause to be due to extended exposure to asbestos dust have created a serious industrial concern. Federal and State legislation is being enacted to place the burden of proof on the employer for continuous confor mance with Governmental Industrial Hygienists' established Threshold Limit Values for specific materials. The employer's problem becomes acute when pre-employment medical examinations are not required for the employees. With the above-mentioned responsibility in mind,and to assure atmospheric conditions which will not contribute to the employees' health problems when working with asbestos fiber containing materials, the Construction Division is initiating the following permanent air cuality control program to be effective June 1, 1968. DUP 1111070 (OVER) acrrcN tmins roe errrcn uvm... eHgmimrmr DU 055062 ^iflWtl;}111181^1 faiiiUlMtllitfi r^lrifnitSfc'feftarBilttaiSn-wwiyTBMi^iliiattaila^^ -2 - \ . *\\ Air Monitoring Environmental air monitoring shall be conducted to provide quantitative data for site evaluation of dust control efficiency' and document air quality analysis needed to demonstrate 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. 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 for 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 dust exposure for what day of that month. 5. The personnel air sampling instrument used shall be a Universal Industrial Equipment Co., Millipore filter, Model 440B (qualified for explosion hazard areas) air sampler. The filter used shall be a .8 micron pore size, Millipore Cat. No. MAWG 037 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 mailed 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 approaching 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 conducted, analyzed and documented. Atmospheric Dust Control The application of the following recommendations should demonstrate conformance with the established dust TLV and provide effective dust emission control. DUP 1111071 ooiaav DU 055063 -3- Atmospheric Dust Control (cont'd) 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. 4. All power shop equipment shall, when operated, have installed exhaust ventilation of sufficient capacity to remove dust particles at point of origin. Exhausted dust particles shall be collected by an effective collector system which will not allow vent-off of dust particles to the atmosphere. 5. ^Present controlled shop cleanliness4 programs shall be expanded. A vacuum cleaner should be used in lieu of broom sweeping to remove dust particles from shop equipment, work tables, ledges, floors, etc. 6. A controlled materials handling program should be adopted to eliminate the emission 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 conditions 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-97 should be used. Tour usual cooperation is anticipated in administering these dust controls. CONSTRUCTION DIVISION Division Safety Superintendent KEK/dlm dup into72 DU 055064 construction dspartmei; October 21, 1960 Fr oh lem: To determine: A. Whether or not the total air-borne asbestos dust count generated during the fabrication and installation of asbestos containing insulating materials exceeds, either at the source or in the breathing zone, the Threshold Limit Valve of 5 million particles per cubic foot (m.p.p.c.f.) established by the American Conference of G~o*v?e-r n--m- i"en-ta* l Industrial Hygienists i/J fid (AC3IH). 3. Extent of air-borne asbestos contamination of the general snots area, surrounding grounds, and installation sites. C. Total dust count for use in the evaluation of over-all atmospheric dust loading and for detection of other potential dust problems. Note: Item C will involve little additional cost as the differsr.cial- counting of the sample is nominal compared to the cost incurred in procuring the sample particularly where special set-ups of worh, tools, and materials are involved. Procedure: I. Collection Two methods will be used for the initial survey: A. Station sampling - portable. The "Unico Constant Rate Uni-Jet" "Freon - 12" powered sampler equipped with the improved standard midget impinger ("Unico 2000") followed^by an 0.6 micron, pore size millipore filter (Cat. No. KAWG037M>) will be used. The dust collected in "dust-free" distilled water inithe impinger will be counted at the University of Pittsburgh Graduate School of Public Health by the method approved by the Asbestos Texcile~Insticute. The dust collected or. the bach-up filter will' be counted also at the University of Pittsburgh. This filter will collect the particles in *he size range be!ow_3 microns which is not retained in the first stage as well as larger particulate which might carry over from the impinger. The limit of resolution in counting is 1.3 microns-. DUf> ui09i oci:iu DU 055083 Page 2 "Uni-Jet" sampler-. 5S.11 be preset to aspirate air sa.-r.tles at the re; nrr.eriei standard rate of C.l cfir., and the sang Is volume calculated from"the aspirating time (usually 1 cu". f The sampling assembly Is readily portable and can be locate close to operating tools, machines, and manual operations. 3. Personnel. The light-weight, compact battery operated "Unico Model kkO Mighty-Mite Air Sampler" has been selected for this phase of the survey. A watep-fillea "Micro Impinger" backed by the "Millipore" filter will be employed to collect the dust samples. This sampler assembly will be carried at all times by the nan selected during his work assign ment and will collect a continuous sample from his breathing zone. Samples collected by both methods simultaneously will reveal the amount of air-borne particulate at the tool and at the point of inhalation. These results will demonstrate wnether the material does, in fact, get inhaled and the efficiency of the ventilating system in reducing the dust count. II. Sample Go-anting. Samples will be sent by Air Mail--Special Delivery to insure delivery to the analyst within 2k hours as speci fied by the Asbestos Textile Institute. The counting, sizing, and calculation of results will be carried out according to the Asbestos Textile Institute's procedure under the direction of Mr. Raymond J. Mane11aInstructor in Occupa tional- Health, of t.ne University ~cf Pittsburgh. A differential count; that is, asbestos ana total dust will be made on each impinger sample but only a total dust count will be taken from the filter as, by definition, fibers will not be present at this stage. This increases the cost to some extent,-but only in this manner can a reliable conclusion be drawn in conformance with the criteria presented in the "Problem." Equipment Required. ITEM ORDER NO. PRICE A) "Unico Automatic Uni-Jet Air Sampler" (Constant Rate) Have on hand Borrowed -- "Mighty Mite Air Sampler" c) "Freer." (Registered) Gas rropellart Ordered LO-PAC-7533 L0-PAG-7 Goo ($124.=C) ( 47.3=) DUP 1111092 o c; i - - DU 055084 jMii-ijuiaTitii a. naan tMiiiia-i : ^ , .,.^,i ,,i^,.i,ir.'iiniMi Pe 3 LO-PAC-7955 LO-PAC-7335^ ( 75.20) E) Hygrometer F) Millipore Filters G) Two-Range Temperature Thermometers LO-PAC-7872 LO-PAC-7871 LO-PAC-7952 \ 16.CO) ( 20.00) ( 72.00) H) Micro-Inpir.gers TO DATE TOTAL PURCHASED ( 15.75) e; ($230.50) Ocher similar cost items may be required as the program progresses. Interpretation of Results. A. L. Linch of the Chambers Works Industrial Hygiene Laboratory will interpret the results. After the accumulation of approximately 50 counts, the problem will be evaluated and redefined if necessary. A preliminary report will be prepared and recommendations for continua tion cr termination of the study presented. With allowance for blanks, the 50 counts will permit collection of approximately twelve samples. Score This survey, to be effective, must encompass all facets of the work performed in the shops and in the field. Some, at least token sampling of sites other than Chambers Works should be included for control purposes. The possibility that this program may be required on a routine basis indefinitely whenever and wherever asbestos containing materials are encountered must be considered. Certain restrictive regulatory actions by Governmental agencies can be expected as a result of the publicity attached to the implication of asbestos in respiratory illness. The burden of proof of compliance with Threshold Limit Values will rest on the user. The initial dust counts have indicated a very low air-borne dust burden in the fabricating shop. This result v/as somewhat surprising andwill require extensive confirmation A conference held with Mr. Corn and R. J. Manella at tr.e University of Pittsburgh"on October .17, i960, developed the following conclusion?~ UP IIIJ093 or <i DU 055085 p -t Cur sampling 02cnnmc.no Is acceptable but r.ust is considered tc recreser.o the minimum required; that is, use of tr.eubach.ing filter should be continued and used ^whenever asbestos dust samples are collected. Inil precaution is necessary for our protection as nealth studies to date have not established whicr. site range is responsible for pathological effects. 2. Samples should be collected with ventilation facilities shut dcvht to determine what the potential dust burden could be if no protection was furnished. These results would provide an estimate of ventilation efficiency_and maximum dust generation levfels. 3. The personnel sampling program (Part B of ProcedureI Collection) is sound and would provide the first information of this type available on actual individual exposure levels during an entire worn assignment. Both Mr. Corn and Mr. Manella expressed interest in a coilabrative effort on this phase. Shy iJ.L hvUd 1. At least three counts will be made for each sample to differentiate betveer. total count and asbestos, and then the after filter must be counted. 2. At this tine we estiraOe-we ' 11 have to sample about 150. material-fabricating combination functions. 3. Each of these samples will get three counts costing $10 per count. Total cost is the projected to approximately $4,500 spread over the entire, sampling period which will likely be IS months. DUP 1111094 or DU 055086