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<br />Tiller Corporation Elk River and Livonia Quarries <br /> <br />Noise Assessment <br /> <br />3.0 NOISE MONITORING PROGRAM <br /> <br />3.1. Noise monitoring locations and results <br />Sound levels were monitored on and near the quarries on Wednesday, 25 October 2006. <br />Continuously recording meters were located at the "Spencer site" shown on Figure 2.1 and the <br />"Trail site" show on Figure 2.5. Larson Davis Model 700 Type 2 logging sound level meters <br />were used at these locations to record sound levels during each one minute interval. These data <br />were used to establish the existing ambient noise in two of the most critical sites. <br /> <br />Spot sound level spectra were measured at these locations as well as at the NE comer of the <br />Livonia Mining Operation, and at a home south of the Elk River Mining Operation shown on <br />Figure 2.3, using a Casella CEL Model 593 Type I sound level analyzer. Octave Band or One- <br />Third Octave Band data were taken every second for periods ranging from 30 seconds to 2 <br />minutes, depending upon the variability of the noise source being monitored. These readings <br />were used to establish source levels of the processing equipment and loaders, to confirm the <br />continuous readings, and to establish ambient readings in other locations. Sound level readings <br />taken near the mine property lines or off-site are listed in Table 3.1. The other readings were <br />taken in the vicinity of process equipment and used to establish sound source levels for this <br />equipment. <br /> <br />Table 3.1 <br /> <br />Monitored (L50) Sound Levels (dBA) at Non-Mining Sites <br /> <br />Reading Time Location eEL 593 LD700 <br />1/1 Octave <br />1 14:34 Trail site 45.1 44 <br />2 15:15 Spencer site 47.1 52 <br />3 15:16 Spencer site 49.7 52 <br />8 15:53 NE corner of mine 64.8 <br />11 16:44 Spencer site 51.6 <br />12 16:45 Spencer site 49.2 <br />13 17:03 NE corner (shutdown) 65.2 <br />14 17:13 NE corner (shutdown) 67.3 <br />15 17:25 Spencer site (shutdown) 47.4 50 <br />16 17:50 Trail site (shutdown) 37.8 37 <br />17 18:13 South home site (shutdown) 48.0 <br />1/3 Octave <br />1 14:39 Trail site 46.3 <br />2 18:15 South home site (shutdown) 46.7 <br /> <br />Based upon an analysis of sound levels in the vicinity of mining equipment, the assumed source <br />levels for this assessment are presented in Table 3.2. <br /> <br />David Braslau Associates, Inc. <br /> <br />Page 10 <br />