PC-2010-11, ALAMEDA COUNTY SURPLUS PROPERTY AUTHORITY

Limit noise levels from auto mall car wash stations to 60 dBA at the continuing care community facility. At the auto mall, all car washes shall be located and designed such that noise from the car washes, including the vacuuming areas, shall not exceed 60 dBA at any habitable structure, per MM NO -1.5. Draft SE1R, pp. 70-73; DEIR, p. 3.7-21 19. Potential for groundborne vibration due to project construction activities Finding. The City finds that the following mitigation measures are feasible and have been incorporated into the MMRP, thereby mitigating the impact to a less -than -significant level: Reduce potential pile driving vibration effects on nearby structures below the structural damage threshold. To mitigate potential pile -driving vibration impacts, a site- specific engineering assessment shall be completed under the supervision of a qualified vibration consultant to assure that there would be no potential for structural damage to nearby existing buildings, based on a vibration damage threshold for a peak particle velocity (PPV) of 0.20 inches per second. This plan shall be submitted for review and approval of the City Engineer prior to approval of the bridge plans to ensure that maximum feasible vibration reduction is achieved, per MM NO -2.1. Notify neighbors within 300 feet of the bridge project construction area at least 30 days in advance of any pile - driving activities about the estimated duration of the activity and prepare a list of measures to track and respond to complaints pertaining to bridge -construction, per ,MM NO -2.2. Draft SEIR, pp. 70-73, DEIR, p. 3.7-29 20. Potential for substantial temporary or periodic increase in ambient noise levels during project construction. Finding. The City finds that the following mitigation measure is feasible and has been incorporated into the MMRP, thereby mitigating the impacts to a less -than -significant level: 27 Findings and Statement of Overriding Considerations