Document ypkgavZ5Lx83zDp8XnE3pEO53

At the request of Bob Whelan, W. E. Porter visited the Tilo Plant on October 18 and 19, 1971 for the purpose of surveying and evalua ting the in-plant environmental conditions. Studies included determinations of dust and/or total particulate concentration in workroom air, noise level measurements, and workplace lighting measurements. All results and measurements are included in the attached tables. Dust and particulate concentrations were determined by gravimetric analysis. Ten-minute samples were collected on C-elman Type A. glass fiber filters, using a high volume sampler to draw air through at a metered flow rate. Three of the four samples collected were well below the OSKA Threshold Limit Value of 15 milligrams per cubic meter of air (mg/m.3). for nuisance or inert dusts or particulates. The sample taken in the cooling drum area of the asphalt department showed a total particulate concentration of 10.05 mg/m.3 , which excee the Threshold Limit Value of 6 mg/m3 (equivalent to 20 million partic per cubic feet) for mica dust. Since this analytical method measures total particulates, this value of 10.05 mg/'m3 wrould also include the limestone filler, oil mist and any other particles present in the air in addition to mica dust. Therefore, the actual weight of the mica dust might possibly-comprise less than 5 mg/m.3 of the total. It shot also be pointed out that the dust condition existing at the time the sample was taken probably represents the extreme and not the typical situation, since the dust collecting system was operating at less tha: maximum effectiveness due to holes in bags. It Is recommended that approved dust respirators be worn by workers in this area until the excessively dusty condition has been corrected. Only one area was identified where a serious problem due to excessive noise exposure Is felt to exist. This is in the vicinity of the vaci pump on the second floor of the felt mill. Here noise level of lCC.j d3A was measured. At this level, OSHA standards permit a maximum exposure duration of less than two hours per eight-hour shift for a worker not wearing approved hearing protection devices. It may be possible to reduce this level to some extent by employing one or a combination of several methods of attenuation. Further investigation including an octave band analysis, will be necessary if serious consi deration is given to such a project. In the meantime, any workers wh spend more than two hours per shift in this vacinity should be suppli with approved ear protectors of either the muff or insert design and should be informed of their obligation under provisions of the Occupational Safety and Health Act of 1970, to wear these. Other RMC0800280000167 E. Thompson 2 0'w uO 3 si -- s ` -- areas where levels greaser chan. 90 dBA were measured are considered so be in compliance because of worker exposure durations chat are less than she maximum permissible. In general, lighting in most areas of she plant is considered adequate, especially office space. There are several areas, however, in the fels mill, asphalt department, aluminum department, and ware house storage areas where levels of illumination, measured five footcandles or less. Some of these areas may require addisional illumination. All measurements were taken during daylight hours on. a clear sunny day. 3ob Whelan plans addisional measurements during night shifts. With the exception of the two conditions discussed above, it is fel that under conditions prevailing at the time of the study, no hazar to the health of workers exist. U. cl WE?:sic Attachments U/.& ?oi ter RMC0S0028000OI68 TABLE I PARTICULATE CONCENTRATION IN WORKROOM uczoce: ;iLO PLANT Sample No, 1 2 3 4 Description 8 cubic meters in cooling drum area Asphalt Department; 5.4 cubic meters in front of saturating tank - Asphalt Department 6.55 cubic meters at slate bin Asphalt Department; 7.8 cubic meters of wood chipper (All samples taken at breathing level' ^ Mg/m. 10.05 3.22 13-02 3-73 RMCOS00280000169 TA.3LE II NOISE LEVEL MEASUREMENTS AT TILO PLANT October 19, 1971 <uU Location dBC* Felt Mill Winder 9S Asphalt Department - coater man's area S2 Defibrator room (wood chipper running) 110 Outside - near truck being unloaded So Aluminum Department Packing area (running emboss) 92 Lead man's desk (running smooth) 89.5 Packing area (running smooth) 36 Felt Mill - vacuum 'pump, second floor - plug-forming screw 113-5 Aspnaiu cutter 9 f' 3oiler room - desk 102.5 95** Maximum ? Exposure h 36** 3-r So 3-5 38 3-f 8S 86 83 .00.5 so Sg .5 8-r 3-r 8-r 1 * ty o 3-f * C weighting network readings included only as indication of frequency character of noise ** Peak - brief oeriod RMC0800280000170 ILLUMINATION MEASUREMENTS AT TILO PLANT October 19, 1571 Location iiiuninarion fooz-canc oo O cm Om Omo roo r-i General aluminum department Embossing roll Cutter Take-off belt Packing Inspection Scale Bailer A1. storage area ii-m( n \i i n m oooo O V Q V O --I , - i .- i <--i Office areas Accounting Accounts receivable Payroll AAA iru n o m n o o m c M -M 'O rh Felt mill Second floor Pulper area Vat end - pulp mill Head end - dryer Take-up reel Rewinder platform Scale in o m m in o m r-1 CM Asphalt department Paper storage area Feed end Splice iron Sat. tank area General Take-up end Palletizing M CM in in r-l r-i General warehouse (between shipping & asphalt) Office end - aisle Center Asphalt warehouse - along driveway Al. trim warehouse 10 *4 5 RMC08002S0000171