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<br /> Noise Attenuation Policy 2: Noise Attenuation Strategies. Utilize a combination of setbacks, <br /> sound berms and other land forms, walls, building construction techniques and physical <br /> orientation of buildings and uses, as shown in Figure 7-1, to achieve acceptable noise levels. <br /> Guidelines: <br /> 2.1 For exterior noise in Phase II noise sensitive use areas that are subject to noise from <br /> roadways: <br /> - Construct new berms, as shown in Figure 7-1 (EIR NOISE STUDY RESULTS <br /> NEEDED), to achieve an exterior noise level of 65 dBA Ldn wherever possible for <br /> Phase II noise sensitive use areas. <br /> - Noise sensitive use areas located closest to a roadway sound source which cannot be <br /> buffered by the sound berm/wall plan shown in Figure 7-1 (EIR NOISE STUDY <br /> RESULTS NEEDED) may be constructed without further outdoor exterior noise <br /> mitigation. <br /> Phase II noise sensitive uses located in areas with ambient noise levels of greater than <br /> 65 dBA Ldn following the construction of noise attenuation barriers, as shown in figure <br /> 7-1, should use site development patterns, and/or building construction techniques to <br /> reduce noise to the extent feasible where outdoor use is a major consideration consistent <br /> with other Specific Plan goals. <br /> 2.2 Indoor noise levels for all habitable structures should not exceed 45 dB Leq during hours of <br /> operation. <br /> Noise Attenuation Policy 3: Noise Attenuation Barriers. Design sound barriers as either <br /> berms or soundwalls integrated with landscaping. Soundwall design shall be compatible with <br /> adjacent architecture and constructed to minimize the possibility of vandalism and graffiti. <br /> Guidelines: <br /> 3.1 Landscaped soundberms are the preferred sound attenuation barrier along the 1-680 <br /> corridor. Where the required height of noise attenuation barriers exceeds reasonable or <br /> feasible berm construction, berms integrated with soundwalls are encouraged. <br /> 3.2 Soundwalls without berms may be used along the UPRR tracks as shown on the Noise <br /> Mitigation Diagram (Figure 7-1). <br /> 3.3 Soundwalls should be screened by landscaping to deter graffiti and improve their <br /> appearance. <br /> Administrative Draft, Bernal Property Phase II Specific Plan, October 25,2005 Page 46 <br />