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25. Will the Project Generate Dust, Odors, or Noise During Construction and/or Operation? -X.... Yes No If yes, describe the sources, characteristics, duration, and quantities or intensity, and any proposed measures to mitigate adverse impacts. Also identify the locations of sensitive receptors in the vicinity and estimate the impacts on these receptors. Existing Conditions Existing noise levels were monitored at three locations surrounding the Twin Lakes Development. The locations of the noise receivers are illustrated in Figure 7. Noise receiver 1 is located next to a residence along Fairview Avenue just south of the intersection with County Road C. Noise receiver 2 is located next to a residence along Fairview Avenue just south of the intersection with Centennial Drive. Noise receiver 3 is located in a field next to a residence between Millwood Avenue and Lincoln Drive. Monitoring was conducted for a 30-minute period between 3:00 and 6:00 p.m. at receivers 1 and 2 on both February 27 and March 5. Monitoring was conducted between 3:00 and 6:00 p.m. on March 10 at receiver 3. All monitoring was completed using a Metrosonics db-308 Statistical Sound Analyzer. The primary noise sources noted during the monitoring periods at each receiver location were traffic on Fairview Avenue at receivers 1 and 2, and traffic on Snelling Avenue at receiver 3. Traffic on the cross streets and airplanes overhead also contributed to the noise monitored. The results ofthe monitoring are shown in Table 4. The recorded noise levels were 62 dBA at receiver 1, 61 dBA at receiver 2 and 57 dBA at receiver 3. Table 4 indicates that the monitored noise levels do not exceed the state daytime residential noise standard of 65 dBA. Construction Impacts NOISE - Noise will be generated during construction of the project by construction equipment. Construction noise will be a temporary impact and will be controlled by limiting construction activities to daytime hours and assuring that construction equipment is properly muffled. DUST - Construction of the project will generate dust. Construction activities will disturb existing vegetative ground cover and allow soil material to become airborne. This will be a temporary impact primarily associated with grading activities. ODOR - Odors may be generated by exhaust from engines engaged in demolition and construction activities. Any equipment will be properly equipped to control odor emissions. Forecast Conditions After construction, vehicles generated by the project will add to traffic noise levels along the roads serving the site. A noise analysis was conducted to detennine whether there would be adverse impacts on sensitive land uses (receptors) in the vicinity of the project. The noise-sensitive areas are represented by the three noise receiver locations and were analyzed for the Forecast Year 2011 conditions with and without traffic from the Twin Lakes Development. To assess the potential impacts related to vehicular traffic generated by the project on those residences adjacent to the Twin Lakes Development, noise levels were estimated using procedures given in the FHWA Hig:hwav Noise Prediction Model (FHWA-RD-77-108, December 1978) and based on the following assumptions: #24397 21