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All plants were of similar construction—steel I-beams covered by either single-ply corrugated steel sheeting (Figure 24), single-ply corrugated steel sheeting covered with foil-faced polyethylene bubble insulation, or two-ply sheeting with insulation between the plies, and concrete or steel grating floors. The number of floors in each plant varied from 5 to 12. Table 10 summarizes the characteristics of each plant. Investigations at the preparation plants included worker dosimetry and task observations of plant employees, and sound level measurements on all plant floors, control rooms, and lunch rooms.

Leq(A) sound levels around a Joy miner/bolter during mining. —Leq(A) sound levels around a Joy miner/bolter during bolting cycle. —Leq(A) sound levels around an Alpine miner/bolter during mining only. —Leq(A) sound levels around an Alpine miner/bolter during mining and bolting. —Leq(A) sound levels around a Joy Model 14BU10 loading machine. —Leq(A) sound levels around a Fletcher Model DR–15–E single-boom roof bolting machine. —Leq(A) sound levels around a McLanahan HV–50 feeder-breaker. —Leq(A) sound levels around a Stamler Model BF–14A–1Z–530 feeder-breaker.

Figure B–6 is the sound profile plot for a single-boom center bolter. The exposure of the operator is governed by the high noise levels located near the operator’s position. Figures B–7 and B–8 show sound levels during coal conveyance for McLanahan and Stamler feeder-breakers, respectively. These plots reveal that the sound levels were slightly higher for the McLanahan feeder-breaker. Figure B–9 illustrates that the sound levels for two auxiliary fans approach 120 dBA, which is greater than the maximum MSHA allowable sound level of 115 dBA.

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