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combination of more than one of these methods. Site-specific noise reduction measures shall be determined prior to Development Permit approval." (c) Implementation(a)under Objective 2 in Noise(Appendix C)should be replaced with: "Specific Plan and Development Permit Application Requirements. Applications for a specific plan or a Development Permit shall include acoustical studies for noise-sensitive land uses proposed to be located in areas exposed to noise levels above an Lm of 60 dB.These studies shall be submitted to the County with each specific plan. Appropriate mitigation measures shall be recommended in these studies and implemented by the appropriate party to ensure that the Ld.of 60 dB is maintained." (d) The following Implementation should be added under Objective 1 in Mobile Sources Noise Control (Noise)(Appendix C): "d) Noise studies for specific residential projects proposed in noise impacted areas(exposed to an Lft above 60 dB)shall address how noise levels in outdoor use areas, such as backyards,patios,decks, _ and other noise-sensitive land uses could be maintained below an Ld.of 60 dB. Noise studies and recommendations shall be submitted with each Tentative Map application." (e) Table 11.1 in the Draft Master Plan should be revised to reflect the most recent average daily traffic projections for I-205 (assuming six lanes in the future,not eight lanes)and for all other roadways. ► Mitigation Measure M4.14-2 A new Objective,Policy, and Implementation under Mobile Source Noise Control(Noise)(Appendix C) should be added: - "Objective: "To minimize impacts on existing residences located along the roads to the Mountain House community. "Policy: "Outdoor use areas of existing residences that are projected to be impacted(i.e.,would experience an increase of five dB in the La)by project-generated traffic noise at buildout shall be protected from excessive noise. Individual residences could take the form of constructing soundwalls along the — roadways, soundproofing homes,or building barriers around specific portions of yards to provide shielded outdoor spaces. Because of the nature of the development in the area, solutions will have to be tailored to each specific situation,based on individual noise studies. — "Implementation: "A plan for mitigating noise levels at existing residences shall be submitted with each specific plan application. The plan shall identify the mitigation necessary to reduce exterior noise levels to an Ld„of 60 dB and interior noise levels to an Ld.of 45 dB or less." ► Mitigation Measure M4.14-3 The following should be added to Implementation(a)under Objective 6 under Mobile Source Noise Control — (Noise)(Appendix C). "A 500-foot wide on-site or off-site buffer would reduce noise levels generated by agricultural machinery and helicopters by approximately 20 dB and would significantly reduce the potential for noise impacts." EDAW College Park at Mountain House Specitic Plan III Draft EIR — Noise 4.13-12 San Joaquin County