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Phase I subdivisions located in areas with ambient noise levels of <br />greater than 65 dBA Ldn following the construction of noise <br />attenuation barriers, as shown in Figure 6-1, are encouraged to <br />use site development patterns, housing product type options, <br />and/or building construction techniques to reduce noise to the <br />extent feasible- where outdoor use is a major consideration leg. <br />backyards in single-family residential areas and recreational areas <br />in multi-family residential areas), consistent with other Specific <br />Plan goals. <br />2.2 For Phase I residential uses in areas where [he noise source from a <br />railroad leg. along the UPRR tracks) exceeds a maximum train pass-6y <br />level of 75 dBA, interior noise shall be Ihnited to a maximum <br />instantaneous noise level of 50 dBA in bedrooms and 55 dBA in other <br />rooms through a combination of soundwall and building conswction <br />techniques. <br />2.3 For Phase I park uses where the ambient noise levels exceed 65 dBA Leq <br />(daytime noise), locate noise-sensitive park uses in areas where [he <br />ambient noise level is projected to be less than 65 dBA. <br />2.4 Locate commercial/office buildings to form an effective noise barrier for <br />residential uses on Parcels 10 and 11. If residential development on <br />these parcels preceeds construction of commercial/ office buildings, the <br />noise condition shall be considered an interim impact and no additional <br />outdoor mitigation is required. <br />2.5 Interior noise levels for all residential uses, hotels, and other quasi- <br />residential uses shall not exceed 45 dB Ldn. <br />2.6 Interior noise levels for commercial and office structures shall not exceed <br />45 dB Leq during business hours. <br />Noise Attenuation Policy 3: Design of Phase I Noise Attenuation Barriers. <br />Design Phase I sound barriers as either berms- or soundwalls integrated with <br />landscaping. soundwalls shall be compatible with adjacent architecture and <br />designed to minimize the possibility of vandalism and graffiti. <br />GUIDELINES: <br />3.1 Landscaped soundberms are the preferred sound attenuation barrier <br />along the I-680 corridor. Where the required height of noise attenuation <br />6-3 <br />