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would meet the General Plan noise standards and noise mitigation is not required for these noise sources. Nevertheless, the project has been conditioned to provide disclosure to buyers of the proximity to the airport and overflights. 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 Lm~ inside the residences with the windows and exterior doors closed. In order to meet this interior noise standard, the windows and exterior doors on the east, west, and south sides of the homes 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 homes would also need to be provided with forced air mechanical ventilation (i.e., air conditioning) so that windows and doors may be 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. A condition of approval requires that the applicant comply with the recommendations of the noise study. Noise Impacts on Adjacent Properties 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 City normally allows construction hours from 8:00 a.m. to 5:00 p.m., Monday through Friday, with Saturday construction allowed if there are no nearby residents that could be impacted by construction noise or activities. Since there are existing residences directly adjacent to the proposed project site, staff is not recommending that Saturday construction be allowed. Staff is recommending a condition that would allow the Director of Planning and Community Development to approve earlier construction "start times" or later "stop times" only for specific construction activities (e.g., concrete foundation/slab pours) if it can be demonstrated to the satisfaction of the Director of Planning and Community Development that that the construction and construction traffic noise will not impact nearby residents. Construction equipment would be required to meet DMV noise standards and be equipped with muffling devices. Gradine Plan The subject property generally has flat terrain. Site grades generally range from an elevation of 352 feet at the south end of the site to an elevation of 361 feet at the northeast corner. Grading for the proposed project would be limited to that required for preparation of the building pads and foundations, streets, and utilities. Retaining walls from 1.2 to five feet in height would be PUD-74 Page -12 - June 25, 2008