SU0004916 - Laserfiche WebLink

Home Browse Search

Mountain House Specific Plan II I ............................................................................................................................................................................... CHAPTER ELEVEN: NOISE 11.1 INTRODUCTION Mountain House is located adjacent to several identified noise sources,primarily transportation related (roadway traffic and railroad operations). In addition,a new airport is being constructed approximately five L miles to the northwest of the project site,with the main runway aligned with the southwest corner of the community. i This chapter summarizes Master Plan provisions related to noise, and states both the Plan Description and Implementation Measures for Specific Plan III. Chapter Nine: Transportation and Circulation,provides additional information on roadway traffic and transportation facilities. V The following assumptions about noise impacts are used for this Specific Plan: a. The Noise Chapter of the San Joaquin County General Plan establishes a policy to limit exterior noise levels to 65 dB Ldn(a composite 24-hour average noise level descriptor) for residential developments, L and 60 dB Ldn for schools,group care facilities, and hospitals,in order to provide an acceptable environment for outdoor activities. r. b. Standard construction practices under the current Uniform Building Code(UBC) are expected to provide an exterior to interior noise level reduction of at least 20 dB,therefore achieving an interior noise level of 45 dB Ldn with the windows in the closed position. c. The Noise Chapter of the San Joaquin County General Plan also requires an acoustical analysis for r, development of residential or other noise sensitive land uses in areas where the exterior noise level is predicted to exceed 60 dB Ldn. d. Noise-sensitive land uses include residential, education,and hospital uses. 11.2 MOBILE SOURCE NOISE 11.2.1 Master Plan Summary The Master Plan requires a variety of measures to mitigate noise from mobile sources. Berms,barriers, soundwalls,setbacks,landscaping,or some combination of these measures will be used adjacent to r. transportation noise sources to reduce indoor and outdoor noise exposure to acceptable levels. Where excessive sound wall heights would be necessary, a combination of setbacks and berms or sound walls will be considered. Setbacks will be used in conjunction with noise barriers where necessary to achieve acceptable levels of noise. Draft 03/14/05 11 -1 ...............................................................................................................................................................................