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2: ~. Some proposed residential development on the West Parcel north <br />of the 1-680 overerossing of the Pleasanton Avenue extension would be exposed to a <br />Ldn of greater than 65 dB. <br /> <br />Measure Lla(1). Increase the height or shift the location of the proposed <br />berm/soundwall. <br /> <br />Measure Llc(3). Require detailed project-specific noise studies for each development <br />project in an area where the standard is exceeded to characterize noise conditions and <br />to identify the noise reduction features that must be incorporated to achieve acceptable <br />interior noise levels, and require incorporation of those features into construction. <br /> <br />Findimz: Specific economic, social, or other considerations make infeasible mitigation <br />measures or project alternatives identified in the final EIR. <br /> <br />Facts in Suonort of Findinm The following facts demonstrate that it is not feasible to <br />mitigate the impact to a less than significant level. <br /> <br /> a. Mitigation measures required to reduce noise levels to 60dB require <br />construction ofa soundwall within Caltrans' jurisdiction on the B-2-1 channel/UPRR <br />overcrossing bridge. It also requires a sound beam elsewhere of 30 feet in height or <br />sound walls at residence yards. These measures have been rejected as infeasible <br />because <br /> <br /> (1) they interfere with other General Plan policies requiring retention of <br />views westward across the property from 1-680; <br /> <br /> (2) they would likely be unaesthetic (wall on bridge structure with no <br />landscaping opportunity) or unnatural-looking (30 ff. high leVee-like berm) along the <br />designated 1-680 scenic route; <br /> <br /> b. City General Plan standards allow noise levels to exceed 60dB in outdoor <br />areas when necessary to achieve other General Plan goals. <br /> <br /> c. The Project has incorporated the mitigation measure requiting indoor noise <br />levels to achieve the City standard of45dB Ldu. <br /> <br /> d. The Project has incorporated requirements for using site development <br />patterns, housing produce type options, and/or building construction techniques to <br />minimize outdoor noise to the extent feasible (PUD Condition ). <br /> <br /> e. The No Project Alternative is the only alternative which would avoid this <br />impact. It is rejected because it would not meet any of the Project Sponsor's objectives <br /> <br />57 <br /> <br /> <br />