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PUD-74 Environmental Checklist airstrip, would the project expose people residing or working in the project area to excessive noise levels? Discussion a,e) For single-family housing projects, the City's General Plan generally requires that backyard areas not exceed 60 dB La„ and that indoor noise levels not exceed 45 dB La,,. In addition, if the noise source is aircraft, the General Plan states that residential developments should be strongly discouraged where exterior noise levels exceed 55 dB La„ due to aircraft and should not be allowed in areas where exterior noise levels exceed 65 dB La„ due to aircraft. A noise studyb was prepazed to ensure that the project will meet General Plan noise standazds. The noise study indicates that the aircraft noise exposure at the site is less than 55 dB La„ and that traffic noise exposure at the site is less than 60 dB La,,. Therefore, noise levels from traffic and airport noise would be aless- than-significant-impact. The project site is exposed to intermittent noise from the City's Operations Service Center. The noise study indicated that the police firing range, which is located approximately 630 feet from the project's southern boundary, would be the most significant noise source from the OSC. The noise study indicates that gunshot noise is significantly more annoying than traffic noise at the same level. The noise study recommends that noise levels from gunshots be reduced to not exceed 40 dBA Lmax inside the residences with the windows and exterior doors closed. In order to meet this interior noise standard, the noise study indicates that the windows and exterior doors on the east, west, and south sides of the units on Lots 3, 4, and 91-96 would need to provide at least 25 dBA of noise reduction on the first floor and provide at least 35 dBA of noise reduction on the second floor. These units would also need to be provided with forced air mechanical ventilation (i.e., air conditioning) so that windows and doors maybe closed at the discretion of the occupants to control noise. The exact Sound Transmission Class (STC) ratings of the windows and doors to meet these requirements would be determined at the building permit stage. Conditions of approval will require the project comply with the recommendations listed in the geotechnical report. Therefore, this would be aless- than-significant-impact. b-d) The development of residential uses on the property will generate added urban noise, such as traffic, landscape maintenance activities, etc. However, noise levels will not change substantially from that currently experienced in the area. Short-term construction noise would be generated during any new construction of this site. The hours of construction will be limited to minimize any impact to surrounding land uses, particularly the adjacent residences. Construction equipment would be required to meet DMV noise standards and be equipped with muffling devices. These requirements will be made as conditions of the project approval. Therefore, these items would be ales-than-significant-impact. 29