11 ATTACHMENT 04 - Laserfiche WebLink

these parking restrictions shall be recorded as restrictive covenants that will "run with the land" and, therefore, shall be binding on all future property owners. There will be adequate parking provided in the development for both residents and their guests in reply to the Commission's direction. Although the guest parking will encroach into the common area, adequate area remains for play equipment, and to be used by the residents of the proposed project. The Planning Commission may wish to discuss the feasibility of adding one to two additional parking spaces in the open space area to increase guest and total parking. If this is done, the total parking ratio will increase from 4.54 parking spaces per unit to 4.62 or 4.69 parking spaces per unit, but would decrease the size of the common open space area. Noise and Vibration Noise External noise sources that could affect the site include noise from the railroad to the north and traffic on Stanley Boulevard to the south. For single-family housing projects, the City's General Plan gererally requires that private yard areas excluding front yards not exceed 60 day/night average decibels (dB Ldn) and that indoor noise levels not exceed 45 dB Ldn. In addition, if the noise source is a railroad, an exterior noise level up to 70 dB Ldn is allowed and indoor noise levels cannot exceed a maximum instantaneous noise level (Lmax) of 50 dB in bedrooms and 55 dB in other rooms. Exhibit L are the two noise analyses that were prepared for the proposal. In order to meet the General Plan noise standards, the first noise study required the following mitigation measures: • Install an 8-foot tall acoustically effective barrier along the rear property lines of Lots 5, 6, 7, and 9 and along the rear and eastern side property lines of Lot 8. The applicant proposes an 8-foot tall precast concrete soundwall at these locations (see the fencing exhibit, Sheet L2, for the proposed design). Staff notes that the soundwall heights on the fencing exhibit need to be modified to conform to the height requirements of the noise study. A condition of approval addresses this item. • Install a 6-foot tall acoustically effective barrier along the rear and street side yards of Lots 1 and 13. The applicant proposes a 6-foot tall wood sound fence at these locations. • Provide forced-air mechanical ventilation, such as air conditioning, so that windows and doors may be closed at the discretion of the occupants to control noise. A condition of approval requires that the applicant comply with the recommendations of the first noise study. Staff notes that the above mitigations address train engine/wheel noise but exclude full mitigation for train horns as these short, very loud events will require the installation of a 29-foot tall soundwall along the project boundary lines adjacent to the railroad right-of-way and flanking the sides of the project for 93 feet — Item 6.a., PUD-82 Page 17 of 22 July 13, 2011