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• 5.0 SURVEY METHODOLOGY <br />To quantify the background noise levels in the vicinity of the proposed projed, a comprehensive <br />noise measurement survey was conducted. Four measurement locations were seleded in order to <br />quantify spatial variations in the projed study area's acoustical environment. A continuous monitor H~a:: <br />operated at one location to quantify the diumal variahilily over a 22-hour period. Noise Levels wer:~ <br />recorded during both daytime and nighttime periods to approximate diumal variations. This section <br />discusses the siting of the measurement locations and the measurement methodology. <br />5.1 Siting of Measurement Locations <br />In general, the measurement locations were selected so that the study would encompass all of ttic <br />noise-sensitive receptors identified above. Four measurement locations were chosen, and are shown as <br />M1-M4 in Figure 1. In addition, a continueusly-operating noise monitor was sited at location 3. ftie <br />rationale far the selection of each location is discussed below. <br />• Location 1 was chosen to represent the Town of Somerset. Measurements were taken in the <br />par'xing lot of the Somerset Post Office. The west side of Somerset would be the preferred location <br />because it is closest to the proposed fan location. This area, however, experiences high ambient noise <br />levels as it is situated very near the Gunnison River. The center of Somerset was chosen as a hetier <br />site. Being further removed and partially shielded from the river, it experiences Power ambient levels, <br />and therefore has a greater potential for being impacted by fan noise. <br />,,, _ Location 2 was selected to represent Residence B. This is the only existing noise-sensitive <br />receptor on the north side of the Gunnison River within the projed area. Measurements were taken on <br />the road leading to Bowie at the junction of the driveway to Residence B. <br />Location 3 is situated at the gate on MCC's access road to the proposed fan site. This location was <br />seleded as it is near MCC's Section 18 property line. This is of importance because the noise limits set <br />forth in the Colorado Noise Abatement regulations' are to be met at the property line of the noise <br />generator. <br />Location 3 was also selected as the continuous monitor location. Being on MCC property, this <br />location was accessible and secure. in addition, it is representative of the acoustic environment of <br />. Residence D. Thal is, both locations are approximately equidistant from existing noise sources (SH-133, <br />and the Gunnison River). <br />4 <br />