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riMourtTAm HOUSE PROPOSED ALTAMONT HEIGHTS TENTATIVE MAP 4. ENVIRONMENTAL CHECKLIST <br /> 4.11 NoisE <br /> Less Than <br /> Potential SPIIIEIR Significant <br /> Significant Requires Impact Due New New <br /> Impact Additional to Mitigation Additional Additional <br /> Less Than Adequately Review:No Measures in Impact Not Mitigation <br /> Significant Addressed in Significant Project Addressed in Measures <br /> Issue or No Impact SPIIIEIR Impact Description SPIIIEIR Required <br /> 11. NOISE. Would the project result in: <br /> a) Exposure of persons to or generation ■ <br /> of noise levels in excess of standards El Ll <br /> established in the local general plan <br /> or noise ordinance,or applicable <br /> standards of other agencies? <br /> b) Exposure of persons to or generation ■ Ll El El <br /> of excessive ground borne vibration <br /> or ground borne noise levels? <br /> c) A substantial permanent increase in ■ <br /> ambient noise levels in the project Ll <br /> !� vicinity above levels existing <br /> without the project? <br /> d) A substantial temporary or periodic ■ <br /> increase in ambient noise levels in <br /> El <br /> the project vicinity above levels <br /> existing without the project? <br /> e) For a project located within an ■ Ll ❑ Ll ❑ <br /> airport land use plan or,where such <br /> a plan has not been adopted,within <br /> .two miles of a public airport or <br /> public use airport,would the project <br /> expose people residing or working <br /> in the project area to excessive noise <br /> levels? <br /> 0 For a project within the vicinity of a ■ <br /> private airstrip,would the project <br /> expose people residing or working <br /> in the project area to excessive noise <br /> levels? <br /> SETTING <br /> The primary current source of noise at the project site is traffic from Grant Line Road and <br /> Interstate 205 (I-205). The center of the site is approximately 1,200 feet south of Grant Line <br /> Road and 2,500 feet north of I-205. Construction of Mountain House Community <br /> neighborhoods to the north also contributes to the existing background noise levels. The <br /> project site is located approximately 7.5 miles southeast ofthe Byron Airport in Contra Costa <br /> County and is also influenced by aircraft fly-over noise. According to the MEIR,portions of <br /> Neighborhood A,in which the project site is located, fall within the noise impact area of the <br /> airport. <br /> As a part of the SPIIIEIR analysis, a noise survey was conducted in May 2004 to document <br /> the ambient noise environment at various locations in the planning area,in which the <br /> r-. proposed project is located. Based on the measurements taken, average daytime noise levels <br /> ` (in dBA Leq) in the planning area range from the high 50s to the upper 60s depending <br /> 4-54 <br />