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C e) Silo Area - Sites S-1, 2, 3 <br />I • A11 silo measurements were taken with the R-1 conveyor and <br />t~i <br />first baghouse operating. At no time during monitoring was the <br />LI fan at the base of the first silo operating. Measurement results <br /> were: <br /> Site 5-1 <br />I' An increase of only 1 d6 was observed in the A-weighted <br /> value. The sound level at 31 Hz increased 10 dB while that <br /> at 500 Hz decreased 6 dB. Above 1 KHz the octave band signa- <br /> <br />(~ ture is similar to that derived last September. On March 26, <br />I <br />, data was recorded which revealed an intermittent 12 d8 fluc- <br /> <br />C tuation which Impact personnel possibly attributed to the R-1 <br /> takeup. Such fluctuations may be due to variations in the <br />• conveyor load. Sound levels at 2 KHz fluctuated from 36 to <br /> 48 d8. These fluctuations were prominent above the other <br /> background noise. <br /> Site 5-2 <br /> The R-1 takeup is directly above this measurement site. <br /> <br />y Sound increases of 11 dB and 8 dB were observed at the 31.5 <br /> and 63 Hz octave bands respectively, however, the overall <br />~; <br />.~ A-weighted sound level decreased 3 dBA from last September <br /> when it was measured to be 64 dBA. <br /> Site 5-3 <br /> A-weighted sound levels have decreased 8 dB from last <br />_ September's values. Examination of the octave band data <br /> indicates a particularly noticeable decrease of 14 dB at <br />_ • <br />