Document E7o6o6wmxgqm9nJv7XoMbr6b

L. TO E. B. Katzenmeyer, Jr. R. A. Kellev FROM * .1.0 POINT OR AKftQN MF HT *(J. Akron *FIELD FOJNT Oft AKRON Dr*R IMtNT 6UOG NO. H. Waltemate SUBJECT PEDRICKTOWN INDUSTRIAL HYGIENE SURVEY v^V '-v. . \ i \ UK DATE TOtFS LETTER OATt THIS LETTER November 25, 1975 Attached for your information is the Industrial Hygiene Survey of the Pedricktown plant. It should be noted that this survey was conducted August 5-9, 1974. There have been numerous changes since that date. A similar survey was also conducted at Avon Lake General Chemical. We have not received any report to date- y H. Waltemate /kats enclosure cc: J L. Nelson - E. W. Harrington R. L. Toole - J. A. Klupar T. B. Johnson arO-49U-B RKV. 11,*) UTHO. IN U.S.A. NOC 12091 INDUSTRIAL HYGIENE SURVEY ClF B.F. Goodrich Chemical Company Polyvinyl Chloride Operations Pedricktown, New Jersey SURVEY DATE August 5-9, 1974 SURVEY CONDUCTED Robert Curtis James Jones Cheryl Rea Preston Rea BY REPORT WRITTEN BY James Jones DATE OF REPORT Oct. 1975 Environmental Investigations Branch Division of Field Studies and Clinical Investigations National Institute for Occupational Safety and Health Cincinnati, Ohio Place Visited: Date of Visit: Persons Making Visit: Persons Contacted: Purpose of Visit: B.F. Goodrich Chemical Company P.O. Box 400 Pedricktown, New Jersey 08067 August 5-9* 1974 Robert Curtis James Jones Cheryl Rae Preston Rae A,R Weber, Plant Manager J.A. Klupar C.P. Hess To conduct an industrial hygiene survey of vinyl chloride polymeriz tion operations. NGC 12093 INTRODUCTION The National Institute for Occupational Safety and Health (NIOSH) has underway an industry-wide survey of the vinyl chloride (VC) industry. As part of this study industrial hygiene surveys are being conducted to determine "typical" VC exposures at plants using each of the four production processes for making polyvinyl chloride (PVC). There are only four plants in the cotmtry using the bulk, or mass, process. Because of this and the fact that B.F. Goodrich (BFG) had offered their assistance in the VC investigations, it was decided to conduct an indus trial hygiene survey at the Pedricktown plant. On August 5, 1974, an initial meeting and a plant tour were attended by Robert Curtis, James Jones, Cheryl Rae and Preston Rae. Sampling was Chen conducted August 5-9, 1974. During this visit approximately 210 air samples were taken for evaluation of VC exposures. In addition, samples were taken to evaluate exposure to PVC dust. Noise measurements were also made in selected areas. - DESCRIPTION OF THE FACILITY The Pedricktown plant is entirely a PVC production facility. Milling and calendaring of PVC is also done here. VC is currently used in two separate processes to make PVC: the mass process and the suspension process. The plant began operations in March, 1970. Processes are computer con trolled to minimise necessary labor requirements. The work force consists of 260 people, 50 of whom actually work in the PVC polymerization areas. All BFG employees are salaried and there is no union. All maintenance and cleaning operations are contracted to Allied Maintenance Company ' whose workers are members of Local 68 of the International Union of Operating Engineers. These employees are assigned full time to BFG and work under the direction of BFG lead technicians. MEDICAL, INDUSTRIAL HYGIENE, AND SAFETY PROGRAMS This facility has an in-plant dispensary with a registered nurse on duty Monday through Friday during the day shift. All lead technicians have first aid training. In addition, Dr. Charles Norton of Woodstown, N.J. visits once a week. Dr. Boyer visits once a week for the Allied Maintenance employees. Emergency arrangements have been made with the Salem, N.J. hospitals, Pre-employment physicals are required. These include a general physical examination, audiometry and SMA-12 blood tests. The SMA-12's are repeated every 6 months . The Safety Department consist:; of a safety engineer and an assistant. Hard hat.: safety glasses, respirator and safety shoe programs are in operation. In -1- NOC 12094 J addition, workers are supplied work clothes and are required to change work clothes each day. Daily showers are mandatory for workers in the polymerization areas. Workers are required to wear fresh air supplied respirators when entering vessels for cleaning or when performing other jobs, such as cleaning filters, that have a high potential for VC expo sure. Industrial hygiene monitoring is carried out by laboratory personnel. A charcoal tube absorption method is used to collect personal samples. An automatic sequential sampling system has been installed in each polymeri zation building. This sample system consists of a Bendix total hydrocarbon analyzer with six sampling points. Analysis time for each point is two minutes, so each point is sampled every twelve minutes. These sample results are fed into a computer, which stores peak values for each point and calcu lates shift averages. It also actuates a visual alarm in the production areas whenever levels go over 25 ppm. In addition one person, per shift, spends full time on VC leak detection using a Century Organic Vapor Analy zer. When a high VC level is shown by the automatic sampler, he determines the cause of the high reading and sees that it is corrected. Mass Resin Process DESCRIPTION OF THE PROCESSES The mass process is a relatively new process in the United States. The process is licensed from a french company, Pechiney-St. Govain, and the major equipment is made in France. VC and catalyst are fed to a pre polymerization reactor where polymer seeds are produced in slurry form. The slurry is then transferred to other reactors where the polymerization is continued to produce a free flowing powder. Only one pre-polymerization reactor is used to feed all the. main polvmerization reactors. When poly merization has been completed, unreacted monomer is removed from the reactor by vacuum. The off gas is compressed and the vinyl chloride con densed and then recycled to the process. The granular polymer is then conveyed with air to a series of screens and grinders where the product is ground and classified before being transferred to storage, compounding or to bagging. Suspension Resin Process The suspension process is the most widely used process in the United States. About eighty-five percent of all FVC resin is produced by this process. VC emulsifiers and catalysts are metered into stirred autoclaves where PVC is produced by a free radical aqueous polymerization reaction. After the reaction reaches a predetermined completion, the unreacted VC is stripped from the PVC-var.er slurry, condensed and them recycled to the process. The stripped FVC-wate.r slurry is then [jumped to blending tanks where batches from several autoclaves are blended for product uniformity. From the blend tanks, the PVC-v/ater slurry is pumped to a dewatering centrifuge whore appro imately 90% of the water is removed. The PVC resin wet cake is conveyed fro NGC 12095 the centrifuge to a flash dryer where essentially all the remaining water is removed. The dry PVC resin is then screened and air conveyed to storage, compounding or bagging. INSPECTION OF PLANT Potential Health Hazards Potential health hazards observed during this survey were as follows: 1) Respiratory exposure to VC 2) Respiratory exposure to PVC dust in bagging operations 3) High noise exposures in various production areas SURVEY PROCEDURES General Air samples were collected in the plant for evaluating exposure to VC and PVC dust. A noise survey was also conducted. The following paragraphs describe the methods used to collect and analyze the air samples and take noise measurements. Vinyl Chloride Both personal and general area samples for VC were collected in the PVC production areas using charcoal adsorption tubes. Area samples were-col lected in control rooms or at operator's desks. Personal samples were collected on workers only when they left the control room. The samples were taken with Sipin SP-1 pumps al: a flow rate of approximately 50 milliliters per minute for a maximum of 20 minutes. Standard SKC charcoal tubes were used. Some samples, collected on the same person on the same day, were combined for analysis in order to reduce the number of analyses. At the end of each day, all samples collected that day were packed in dry ice to prevent loss of sample. At the end of the week of sampling, these samples were shipped to the NIOSH laboratory in Salt Lake City, Utah. There, the samples were desorbed with carbon disulfide and analyzed by gas chromato graphy according to the procedure outlined in NIOSU Physical and Chemical Analysis Method No. 127 and the May 31, 1974 Vinyl Chloride supplement to this method. Polyvinyl Chloride Dust Personal samples for airborne PVC dust were collected in the bagging areas. These were total dust gravimetric samples taken for approximately 4 hours at a flow rate of 2 liters per minute. All samples were collected on 37 millimeter diameter Mine Safety Appliance (MSA) PVC membrane filters with a 5 urn pore size. Three piece millipore filter cassettes were used with only the small plug removed (leaving a 4 run -3- NOC 12096 diameter opening). A MSA Model G portable air sampling pump was used to pull air through the filter. All filters were tared and`re-weighed on the 20 milligram "A" scale of a Cahn Gram Electrobalance. Noise In addition to air sampling, noise measurements were made in production areas. A General Radio Type 1565-A sound level meter calibrated with a Type 1562-A calibrator was used for all measurements. The meter response was set on the slow position and measurements made on the "A" weighting network. RESULTS AND DISCUSSION Vinyl Chloride Samples Mass Resin Area Results of each sample are given in Table 1 and are summarized in Table 3. The lowest personal VC concentration observed was none detected (ND) and the highest was 71.4. parts per million (ppm). Mean personal VC concentra tions for the various job classifications ranged from ND to 6.4 ppm. Area concentrations found in the control room varied from ND to 3.8 ppm with a mean of 1.0 ppm. The workmen spend a majority of their time, when not in the process areas, in the control room. Therefore a time weighted average (TUA) exposure has been estimated for each job category based on the percentage of time spent in the control room. These TWA's ranged from ND to 4.2 ppm. The highest exposure job category was the serviceman, who cleans reactors, filters, etc Suspension Resin Area Results oi each samples are given in Table 2 and are summarized in Table 4. The personal VC concentrations ranged from NT) to 243 ppm. The mean concen trations for job types ranged from 0.2 ppm to 28.2 ppm. Area concentrations found in the control room varied from ND to 96.5 ppm with a mean of 14.3 ppm. Again TWA's were calculated and ranged from 0.2 ppm to 22.7 ppm. The high concentrations were due to several process malfunctions that occurred during the survey. Polyvinyl Chloride Dust Samples Results of the personal PVC dust samples are presented in Table 5. Dust samples were taken only in the bagging operations since this was the only operation involving the dried resin. Local exhaust ventilation was present at each bagging station and seemed to be effective although the area did have a coating of white resin dust. The baggers wore cartridge respirators. ngc 12097 while performing bagging operations. Dust concentrations ranged from 0.38 mg/ra^ to 2.59 mg/ra^. The baggers spent an average of 6 hours per day bagging so TWA dust concentrations ranged from 0.29mg/m^ to 1.94 mg/m3. Noise Measurements Hass Resin Area Noise levels in the process ranged from 85 dBA to 94 dBA. The noise level in the control room was 71 dBA. Levels above 90 dBA were predominantly on the first level around the polys and compressors. Suspension Resin Area Noise levels in the suspension resin poly building ranged from 88 dBA to 93 dBA. < The noise level in the control room was 76 dBA. Essentially the whole building, except for the control room, had noise levels of 90 dBA or above. Noise levels at the bagging stations were quite high. Levels ranged from 106 dBA at the local exhaust ducts to 92 dBA at the loading pallets. A level of 100 dBA was found at the operator's ear position while inserting and removing bags from the bag filler nozzle, CONCLUSIONS AND RECOMMENDATIONS Although differences in VC concentrations were noted for the mass and sus pension resin areas, the difference seemed to be more related to attitudes of supervisory personnel than actual differences in the two processes. Lead technicians in the mass resin area indicated genuine concern about control ling VC exposure and relayed this concern to the other workers, while in the suspension resin area there -seemed to be much less concern about high VC levels. This difference in concern for VC exposure can be exemplified by the following: in the mass resin area, fresh air masks were hung in a readily available location and were cleaned after each usage. In the suspension resin area the first time the VC alarm went off during our survey, the men had to hunt through a storage cabinet to find the air masks. In the mass resin area, as soon as a VC alarm went off, a man was dispatched to find the cause and then the cause was remedied as soon as possible. In the suspension area, the men would push a button that would turn off the alarm. If the alarm continued to come back on several times, a man would finally go to determine the cause. Increased worker education on the necessity for controlling VC emmissions is needed. Therefore it is dif ficult to account for higher VC exposures in the suspension resin area by process differences alone. In both areas the VC concentrations for the most part would not meet the present 0SHA standard of 1 ^pm TWA, However they were generally below the 50 ppm standard in effect at the time of the survey. Higher levels are in part caused by plant VC emmisions being drawn back into the buildings by the ventilation systems. This occurred even though the intakes were well removed from the building. Changes were underway at the time of the survey that would eliminate or at least minimize this problem. These changes con sisted primarily of higher stacks for exhausting contaminated air. All 5 NGC 12098 emission sources were to be vented to common points to facilitate the later addition of VC removal equipment to exhaust vents. With these changes, better maintenance and closer leak surveillance, VC levels should be lowered to near the OSHA standard. 6 NGC 12099 NGC 12100 1. 2. 3. 4. 56. 7,, 8. 910, 11. 12. 13. 14. 15. 16. 17. 18. 1920. 21. Date 8-5-74 8-5-74 8-6-74 8-6-74 8-6 74 8-6-74 8-6-74 8-7-74 8-7-74 S-8-74 8-8-74 8-9-74 8-9-74 8-9-74 8-9-74 8-5-74 8-5-74 8-6-74 8-6-74 8-6-74 8-6-74 TABLE 1 MASS RESIN AREA VINYL CHLORIDE SAMPLE RESULTS Shift 4-12 4-12 4-12 4-12 4-12 4-12 MA -- 1X 0 8-4 8-4 8-4 8-4 12-8 12-8 12-8 12-8 4-12 4-12 4-12 4-12 4-12 4-12 Location or Job Title Control Room Control Room Control Room Control Room Control Room Control Room Control Room Control Room Control Room Control Room . Control Room Control Room Control Room Control Room Control Room Lead Technician Lead Technician Lead Technician Lead Technician Lead Technician Lead Technician No. of Tubes Combined 2 .2 1 1 1 1 1 2 2 1 1 1 1 1 1 1 1 1 1 1 1 V.C. Concentration ppm 3.8 3.6 ND 0.1 , ND 2.0 1.7 1.8 1.8 ND ND ND ND ND ND 2.2 ND 7.3 4.0 19.9 ND NGC 12101 22. 23. 24. 25. 26. 27. Oc uQ 29.30. 31. 32. 33. 34. 35. 36. 37. 38. 39. 40. 41. 42. Date 8-6-74 8-6-74 8-7-74 8-7-74 8-7-74 8-8-74 8-8-74 8-8-74 8-8-74 8-8-74 8-9-74 8-9-74 8-9-74 8-5-74 8-5-74 8-6-74 8-6-74 8-6-74 8-6-74 8-7-74 8-7-74 Shift 4-12 4-12 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 12-8 12-8 12-8 4-12 4-12 4-12 4-12 4-12 4-12 8-4 8-4 TABLE 1 (CONT TD) Location or Job Title Lead Technician Lead Technician Lead Technician Lead Technician Lead Technician Lead Technician Lead Technician Lead Technician Lead Technician Lead Technician Lead Technician Lead Technician Lead Technician Operating Technician Operating Technician Operating Technician Operating Technician Operating Technician Operating Technician Operating Technician Operating Technician No. of Tubes Combined 1 1 1 1 1 1 1 1 X1 1 1 1 1 2 2 1 1 1 1 1 1 V.C. Concentration ppm ND ND 4.2 2.1 ND 2.5 22.6 4.9 ND 14.8 ND ND ND 6-3 9.3 2.8 7.6 7,0 3.0 ND 2.9 43. 44. 45. 46. 47. 48 ,, 49. 50.. 51. 52. 53. 54. 55. 56. 57. 58. 2 59. o o 60. to 61. . .. o to 62. 63. 64 . Date 8-7-74 *8-7-74 8-8-74 8-8-74 8-8-74 8-8-74 8-9-74 8-9-74 S-9-74 8-5-74 8-5-74 8-5-74 8-5-74 8-5-74 8-6-74 8-6-74 8-6-74 8-6-74 8-6-74 8-6-74 8-6-74 8-7-74 CM i-M nCT Shift 8-4 8-4 8-4 8-4 8-4 8-4 12-8 12-8 12-8 4-12 4-12 4-12 4-12 4-12 4-12 4-12 4-12 4-12 4-12 4-12 8-4 . TABLE 1 (CONT'D) Location or Job Title Operating Technician Operating Technician Operating Technician. Operating Technician Operating Technician Operating Technician Operating Technician Operating Technician Operating Technician Serviceman Serviceman Serviceman Serviceman Serviceman Serviceman Serviceman Serviceman Serviceman Serviceman Serviceman Serviceman Serviceman No. of Tubes Combined 1 1 1 1 1 1 1 1 1 1 2 1 1 2 1 1 1 1 1 1 1 2 V.C. Concentration ppm 2.8 3.4 ND 13.7 ND 1.5 ND \TTi i'fU 1.6 2.9 2.7 20.7 2.0 13.4 1.8 1.5 2.0 4.7 0.9 ND 2.3 2.2 NGC 12103 o00 CO \ CO 1 -> 65. 6667. 68. 69. 70. 71. 72.73. 74. 75. 76. 77. 78. 79. 81. 82. 83. 84. 85. Date 8-7-74 8-7-74 8-7-74 8-4-74 8-7-74 8-8-;4 8-8-74 8--8--74 8-8-74 8-8-74 8-8-74 8-9-74 8-9-74 8-9-74 8-9-74 8-9-74 8-9-74 3-9-74 3-8-74 8-8-74 Shift 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 12-8 12-8 12-8 12-8 12-8 12-8 12-8 8-4 8-4 TABLE 1 (CONT'D) Location or Job Title Serviceman Serviceman Serviceman Serviceman Serviceman Serviceman Serviceman Serviceman Serviceman Serviceman Serviceman Serviceman Serviceman Serviceman Serviceman Serviceman Serviceman Serviceman Serviceman Bagger Bagger No. of Tubes Combined 2 1 1 1 1 1 1 1 ]_ 1 1 1 1 1 1 1 1 1 1 2 2 V.C. Concentration ppm 5.1 1.8 4.4 5.3 11.1 14.3 ND 11.7 71.4 10.9 1.4 ND ND ND 5.9 ND ND ND 3.1 ND ND NOC 12104 1. 2. 3. 4. 5. 6. 7. -8. 9. 10. 11; 12 a 13. 14. 15. 16. 17. 18. 19. 20. 21. Date 8-5-74 8-5-74 8-6-74 8-6-74 8-6-~4 8-6-74 8-6-74 8-7-74 8-7-74 8-7-74 8-8-74 8-8-74 8-8-74 8-8-74 8-9-74 8-9-74 8-9-74 8-9-74 8-5-74 8-5-74 8-5-74 TABLE 2 SUSPENSION RESIN AREA VINYL CHLORIDE SAMPLE RESULTS Shift 4-12 4-12 4-12 4-12 4-12 4-12 4-] 2 8-4 8-4 8-4 8-4 8-4 8-4 8-4 12-8 12-8 12-8 12-8 4-12 4-12 4-12 Location or Job Title Office Office Office Office Office Office Office Office Office Office Office Office Office Office Office Office Office Office Pearl Technician Pearl Technician Pearl Technician No. of Tubes Combined 2 1 1 1 1 1 J*L 2 2 1 1 1 1 1 1 1 1 1 1 2 1 V.C. Concentrations ppm 8.3 8.2 43.0 23.8 8.7 96.5 ;n a V V ND 2.2 4.1 2.6 4.1 1.8 6.4 ND ND ND ND 8.0 4.7 2.3 22. 23. 24. 25. 26. 27. 28. 29. 30. 31. 32. 33. 34. 35. 3637. 38. 39. 40. 41. 42. 43. 44. -- Z Q O i--* K> h--* o KJt Date 8-6-74 8-6-74 8-6-74 8-6-74 8-7-74 8-7-74 8-7-74 8-7-74 8-7-74 8-7-74 8-8-74 8-8-74 8-8-74 8-9-74 8-9-74 8-9-74 8-9-74 8-9-74 8-9-74 8-9-74 8-9-74 8-5-74 8-5-74 Shift 4-12 4-12 4-12 4-12 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 12-8 12-8 12-8 12-8 12-8 12-8 12-8 12-8 4-12 4-12 TABLE 2 (CONT'D) Location or Job 'Title Pearl Technician Pearl Technician Pearl Technician Pearl Technician Pearl Technician Pearl Technician Pearl Technician Pearl Technician Pearl Technician Pearl Technician Pearl Technician Pearl T echnician Pearl Technician Pearl Technician Pearl Technician Pearl Technician Pearl Technician Pearl Trainee Pearl Trainee Pearl Trainee Pearl Trainee Paste Technician Paste Technician No. of Tubes Combined 1 1 1 1 1 1 2 1 XT 2 1 1 1 1 1 1 1 1 1 1 1 1 V.C. Concentrations _________ 22TM_______ 11.5 30.6 18.6 36.8 245.0 8.0 6.6 ND 3.1 , 1.0 4.7 7.6 22.4 1.7 ND 54.5 ND ND 6.2 191.0 ND 8.7 3.1 CO I/'t 45. 46. 47. 48. 49. 50. 51. 52. 53. 54. 55. 56. 57. 59. 60. 61. 62. 63. 64. 65. 66. 67. o o to t--* o Date 8-5-74 8-6-74 8-6-74 8-6-74 8-7-74 8-7-74 8-7-74 8-8-74 8-8-74 8-8-74 8-9-74 8-9-74 8-9-74 8-9-74 8-5-74 8-5-74 8-5-74 8-5-74 8-6-74 8-6-74 8-6-74 8-7-74 8-8-74 Shift 4-12 4-12 4-12 4-12 8-4 8-4 8-4 8-4 8-4 8-4 12-8 12-8 12-8 12-8 4-12 4-12 4-12 4-12 4-12 4-12 4-12 8-4 8-4 TABLE 2 (CONTTD) Location or Job Title Paste Technician Paste Technician Paste Technician Paste Technician Paste Technician Paste Technician Paste Technician Paste Technician Paste Technician Paste Technician Paste Technician Paste Technician Paste Technician Paste Technician Rover Technician Rover Technician Rover Technician Rover Technician Rover Technician Royer Technician Rover Technician Rover Technician Rover Technician No. of Tubes Combined 2 1 1 1 1 2 1 1 L 1 1 1 1 1 2 1 1 1 1 1 1 4 1 V.C. Concentrations ppm 23.8 37.9 51.4 80.0 1.6 3.8 4.7 3.4 8.4 8.3 1.8 28.1 158,8 27.6 11.5 6.0 10,7 - 25.8 8.1 14.5 22.9 1.9 2.2 68. 6970. 71. 72. 73. 74. 75. 7 6. --; */7 78. 79. 80. 81. 82. 83. 84. 85. 86. 87. 88. 89. Date 8-8-74 8-8-74 8-9-74 8-9-74 8-9-74 8-5-74 8-5-74 S-6-74 8-6-74 8-6-74 8-8-74 t CO 1 CO 8-8-74 8-8-74 8-7-74 8-7-74 8-7-74 Q 8-7-74 O 8-7-74 iM i-- 8-7-74 O r-~ 1 CO 1 oo 8-8-74 Shift 8-4 8-4 12-8 12-8 12-8 4-12 4-12 4-12 4-12 4-12 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 TABLE 2 (CONT'D) Location or Job Title Rover Technician Rover Technician Rover Technician Rover Technician Rover Technician Utility Man Utility Man Utility Man Utility Man Utility Man Utility Man Utility Man Utility Man Utility Man Bagger Bagger Bagger Bagger Bagger Bagger Bagger Bagger No. of Tubes Combined 1 1 1 1 1 2 2 1 1 1 1 1 1 1 2 1 2 1 2 1 2 2 V.C. Concentrations _________ppm 8.9 ND 2.5 46.7 5.0 7.2 3.2 ND 23.6 16.0 6.9 16.9 ND ND ND ND ND ND ND ND 0.6 0.7 0) c o rt 4-1 o 2 S g. a uQ> c CoJ o 04)} >3o H m *tC4t> e o p H 55 O o V c-J w *4 (0 < H V* o <u a rH 4-J o H H *j 03 jo OO O f--* 4 u Q) 00 00 C0 CO >-< 0) 00 00 t3 CO <C <J00I col r---a.- -r3vcoi o5 o co( cIo oCTi me 12108 TABLE 3 MASS RESIN AREA MEAN VINYL CHLORIDE SAMPLING SUMMARY Location or Job Title Mean Concentration ppm Office 1.0 Lead Technician 4.A Operating Technician 3.6 Serviceman 6.4 Bagger ND Standard Deviation 1.4 7.0 3.9 12.9 -- Range Low High ND-3.8 ND-22.6 ND-13.7 ND-71.4 - Percent of Time Out of Control Room 75 50 60 100 8hr. r\ ppm 3.6 2.3 4.2 ND NGC 12109 TABLE 4 SUSPENSION RESIN AREA MEAN VINYL CHLORIDE CONCENTRATIONS Location or Job Title Office Pearl Technician Paste Technician Rover Technician Utilityman Bagger Mean Concentration ppm Standard Deviation 14.5 25.3 27.7 60.7 28.2 41.1 11.9 12.6 8.2 8.7 0.2 0.4 Range Low High Percent of Time Out of Control Room ND-96.5 ND-245.0 60 1.6-158.8 60 ND-46.7 90 ND-23.6 ND-0.9 75 100 8hr. TWA pom 22.4 22.7 12.2 9.8 0.2 NGC TABLE 5 SUSPENSION RESIN AREA POLYVINYL CHLORIDE DUST CONCENTRATIONS Date Shift Job Title ,-A A Cd ft/ * Concentration rng/m^ 8-7-74 8-7-74 8-7-74 8-8-74 8-8-74 8-9-74 8-9-74 8-9-74 8-4 8-4 8-4 8-4 8-4 12-8 12-8 12-8 Bagger Bagger Bagger Bagger Bagger Bagger Bagger Bagger 0,69 0.72 2*50 1.02 0,70 0.38 1.06 0.57 j rt~ NGC 12111