Document 0qy6XXDVK5JpXmw58oamQjJqb

^nr cyxljn/uw/id Awp p To H. J Mitchel1 Lccaiion. Azusa From; M. J. Gaertner Location: Industrial Hygiene 3ub|CCi. INDUSTRIAL HYGIENE REPORT Daio October 23, 1980 Cony !o J. Ca rna11 R. Pel Ietier J. Ma r i n F. Timmons PLAINTIFF'S EXHIBIT I. Monitoring of AFI Unloading On October 10, 1980, Industrial Hygiene performed noise and dust monitoring during the unloading of an AFI (Aeromyacin Fermentation Intermediate) truck. The following are monitoring results, observations, and recommendations. A. Monitoring Results Employee or Area Sampling T i me Total Dust Total Dust (mq/rn^) (mq/W) TWAq dBA (TWAq) Chief Operator Operator North Side of Truck South Side of Truck Control Board Area 5 hr. 55 min. 4 hr. 50 min. 5 hr. 40 min. 5 hr. 20 mifi. 5 hr. 30 min. 3.0 0.61 5.0 0.74 2.3 0.38 3.8 0.51 92.7 90.5 94.5 70 The permissible exposure limits (PEL) are: 10 mg/m^ (TWA8) for nuisance dust and 90 dBA (TWA8). B.. Recommendations: . 1. 2. 3. 4. 5. ' 6. A. W. DELGADO OCT 3 11980 Operators should continue to wear the 3M Disposable 9910 respirator during the truck unloadings, even though monitoring data indicate results below the PEL. A more effective gasket should be usedat.the unloading hose to truck interface. There was a significant amount of dust generated from this area during the unloading process. Follow-up monitoring for dust should be performed after the gasket modifications have been made. Hearing protection should continue to be worn during the unloading process. Signs stating "Hearing protection required during truck unloading" should be placed in the unloading areas. The noise is generated from the vibrator on the truck. Engineering controls to reduce the noise levels do not appear to be feasible. Because of the infrequency of the truck loadings, the use of hearing protection devices as part of the existing overall Hearing Conservation Program, which includes periodic audinetric testing, is an adequate program for noise control. 0119 'ia no =7 J- II. Discussion of Hearing Conservation Program Jesse Marin and M. J. Gaertner discussed the elements of the Hearing Conser vation Program. Audiometric tests have been given to approximately SO % of the employees and the remainder are awaiting their tests. Semiannual testing has been recommended for those employees working in areas with noise levels greater than 85 dBA. Mr. Marin was given copies of educational and training materials for hearing conservation programs. He is putting together a presentation for the employees. III. Noise Monitoring in the Catalyst Plant A. Monitoring Results ' The following is a summary of dosimetry data taken in the catalyst during visits in May and Ju ly 1980. Operator 4-30-80 5-1-80 7-18-80 7-21-80 7-22-8( Extruder Operator Product Operator Muller Helper Muller Operator Impregnator Operator Lead Operator Material Handler Kiln Operator Cure Wash Operator Cure Wash Helper Mechanic Supervisor 90.3 89.9 85.3 77-5 90.8 81.4 90.0 88.3 88.2 88.3 87.3 85.5 88.0 89.8 80.3 87.2 85.5 84.8 73.5 85.8 The OSHA permissible exposure limit is SO dBA (TWAg^,- The above results indicate that employee exposures do not exceed the OSHA limit. Recommendations: 1. Sians which state requirements for hearing protection should be placed in all areas with noise levels exceeding 85 dBA. 2. The exhaust blowers for the SON Mill and the Silo area generate noise noise levels exceeding 100 dBA when in operation. Signs which state "Hearing protection required when blower h operation" should be placed in the areas of the blowers. 3. Follow-up dosimetry data and noise level surveys should be performed on an annual basis. IV. Dust Monitoring in the Catalyst Plant A. Monitoring Results. During the visit in May 1980, accumulations of dust were seen in various places in the catalyst plant. Samples of the.accumu1ated dust were analyzed for percent platinum, palladuim, and rhodulm. The results represent approximate values, and are os follows: 0120 Area Kiln Feed Level Catwalk Between 311A and 31 IB Platinum 0. 1 Palladuim 0.002 Rhodium 0 Catwalk Top of B Hopper 0. 16 0.05* 0.0004 Catwalk Top of A Hopper 0.04 0.01 0 B-Dryer Exhaust Duct (Discharge End) 0.19 0.16 0.001 Bottom Level Near Air_81ower of B.Ca1c iner 0.12 0.17 0.0004 The results indicate that the dust samples contain a significant amount of platinum. Therefore, area monitoring was conducted during the July I98O visit while MS532 was being produced. The sampling periods were between 7 and 8 hour duration and the results are as follows: Area Date Total Dust Aluminum Platinum Palladuim Catwalk Between (7-21) A & B Hopper (7-22) 0.67 0.23 0.003 0.001 0.0007 0.0003 0.001 < 0.0001 Catwalk Between (7-21) 311A & 3118 (7-22) Bottom Level Between B-Drye/ & B Calciner (7-21) (7-22) / D ischa rge End J \of B-Oryer / (7-21) (7-22) 0.63 1.75 0.46 0.36 0.66 0.60 0.002 0.003 0.003 0.001 0.001 0.0001 0.001 <; 0.0001 (0.002*)< 0.0001 oToirr 0.0001 0.003 0.003 (p7o02*J) 0.0003 orouT ^ 0.0001 Silo Area (7-21) (7-22) (10-10) Sample Vo i d Sample Vo i d 0.41 Threshold Limit Values 10 10 0.002 Not Established These results indicate that significant levels of platinum were detected in the area samples denoted by the asterick (*). . Recommendations: . 0121 1. Further personal monitoring for platinum dust exposure should be conducted for those operators working in the above mentioned areas(*). 2. Concerted efforts should be made.to practice good housekeeping in order to reduce tne accumulation of dust. ----------------- ------------------ 7k A O' 1, * 3. Employees who are required to work in the above mentioned areas (-'.-) for prolonged periods of time (example, maintenance personnel) should be required to wear respiratory protective equipment (dust respirators) V. Industrial Hygiene Training It is recommended that Jesse Marin attend the Industrial Hygiene Training Session to be held at Stanford, Connecticut in July 20 - 24, sponsored by the Corporate Industrial Hygiene Department. " ' __ ' MJG/kp <y* ' M. J. Gaertner 0122