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MOUNTAIN HOUSE NEIGHBORHOOD'F"PROJECT INITIAL STUDY H. NOISE The Master Plan requires that noise levels in primary outdoor use areas(generally back yards)of new residential development not exceed an Ld,, of 60 dB unless the project design includes reasonable mitigation measures to reduce noise in outdoor activity areas to as close to an Ldn of 60 dB as possible. Where it is not possible to reduce noise in outdoor activity areas to an Ldn of 60 dB or less using practical application of the best available noise reduction measures, an exterior noise level of up to an Ldn of 65 dB may be allowed. Under no circumstances shall interior noise levels exceed an Ldn of 45 dB. In terms of soundwalls, the CSD Design Manual limits walls to a 7-foot height maximum and a 6-foot height minimum. Environmental Checklist Potentially Significant Potentially Unless Less Than Significant Mitigation Significant No Impact Incorporated Impact Impact NOISE. Would the project result in: a) Exposure of persons to or generation of noise levels in excess of O ■ O O standards established in the local general plan or noise ordinance, or applicable standards of other agencies? b) Exposure of persons to or generation of excessive ground borne vibration or ground borne noise levels? c) A substantial permanent increase in ambient noise levels in the project vicinity above levels existing without the project? d) A substantial temporary or periodic increase in ambient noise O O ■ O levels in the project vicinity above levels existing without the project? e) For a project located within an airport land use plan or,where O ■ O such a plan has not been adopted,within two miles of a public airport or public use airport, would the project expose people residing or working in the project area to excessive noise levels? f) For a project within the vicinity of a private airstrip, would the project expose people residing or working in the project area to excessive noise levels? Environmental Checklist Explanations a) Exposure of persons to or generation of noise levels in excess of standards established in the local general plan or noise ordinance, or applicable standards of other agencies? Project construction activities would not be subject to noise standards established by the County, as stated in Section 9-1025.9(d)of the County's Development Title. As stated in the Master Plan(page 11.2), "Standard construction practices under the current Uniform Building Code(UBC)are expected to provide ClJOBSWCUNMAL M1JDY\FINALINMAL=Y-PAR72.D0C(7/20/00) 81 V.H. NOISE