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• Noise studies for specific residential Projects <br /> proposed in noise impacted areas (exposed to an Ldn <br /> above 60 dB) shall address how noise levels in <br /> outdoor use areas , such as backyards , patios , decks , <br /> etc . , could be maintained below an Ldn of 60 dB . <br /> Other noise-sensitive land uses , such as schools , <br /> hospitals , and parks shall also req_:ire similar <br /> studies . <br /> • Interior noise levels for housing proposed to be <br /> located in areas exposed to an Ldn above 60 dB <br /> shall be maintained below an Ldn of 45 dB . <br /> Compliance with this recommended mitigation measure <br /> should be verified at the time of the Specific Plan. <br /> • Because of the potential for aircraft overflights , <br /> the results of a noise study shall be included in the <br /> Specific Plan to determine whether changes in the <br /> land use plan and/or treatments to the noise <br /> sensitive structures would be required to minimize or <br /> eliminate noise impacts to Project Site occupants . <br /> Also , the County must consider requiring that <br /> potential new residents be notified of the presence <br /> of the airport and of the potential for aircraft <br /> overflights . <br /> • See FEIR, Section 4 . 16 . <br /> X-2 . Potentially Significant Impact • Noise on Existing <br /> Residences <br /> [ Impact 4 . 16-21 <br /> Existing residences located adjacent to existing roads in <br /> and around the Project Site would be significantly <br /> impacted by Project-generated traffic . <br /> Finding : Changes or alterations have been required in, <br /> or incorporated into, the Project which avoid or <br /> substantially lessen the significant environmental effect <br /> as identified in the FEIR to a non-significant level . <br /> These mitigation measures are listed below. <br /> Statement of Fact : The impact will be reduced by the <br /> following : <br /> • Outdoor use areas of existing residences that would <br /> be impacted ( i .e . , would experience an increase of <br /> 5 dB in the Ldn) by Project-generated traffic noise <br /> must be protected from excessive noise. At the <br /> Specific Plan stage, the County must refine the <br /> traffic study and revise the acoustical analysis to <br /> C2-75 <br /> 0189r/0202r <br />