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078 parking structure construction will result in loud, continuous noise and vibrations. Pile drivers tend to be more irritating to the public than other construction equipment. Finding Finding 3: Specific economic, social or other considerations make infeasible the mitigation measures or project alternatives identified in the EIR. Facts in Support of the Finding While some mitigation is possible through the use of vibratory pile drivers, their feasibility of use for the project is unknown. A temporary, significant and unavoidable impact would result from the use of pile drivers during construction of Phase II. Significant Effect During operation of the proposed Project, visitors within the open framework cube structure would be exposed to existing traffic noise above the 65 dB standard due to its proximity to the 1-5 Freeway. The proposed Project would not contribute additional increases in noise levels, however, vocal communication in the outdoor exhibit area will likely he difficult with maximum sound levels in the average range of 75 to 80 dB. Finding Finding 3: Specific economic, social or other considerations make infeasible the mitigation measures or project alternatives identified in the EIR. Facts in Support of the Finding No feasible mitigation is available to reduce noise levels. Visitors would be exposed to existing high noise levels. Significant Effect Visitors will be exposed to existing noise levels of about 81 dB-CNEL in the parking areas due to its proximity to the Freeway. communication difficult. Findings Finding 1: Finding 3; The high noise levels in the parking lot would make vocal Changes or alterations have been required in, or incorporated into, the project which avoid or substantially lessen the significant environmental effect identified in the Final EIR. Specific economic, social or other considerations make infeasible the mitigation