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LSA ASSOCIATES, INC. JULY 2010 INITIAL STUDY/MITIGATED NEGATIVE DECLARATION FIRST STREET BRIDGE REPLACEMENT PROJECT CITY OF SANTA ANA paid for the various contract items of work involved and no additional will be allowed therefor." Implementation of the Mitigation Measure N-1 and compliance with the City Noise Ordinance and Caltrans Standard Specifications will minimize short-term noise impacts to a level below significance. Mitigation Measure N-1 Prior to authorization of final construction plans, the following measures shall be included in the numbered specifications of the plans: a. Sec. 18-314. Special provisions of the Article VI City Municipal Code requires that construction activities be prohibited between the hours of 8:00 p.m. and 7:00 a.m. on the weekdays and Saturdays, with no construction activities occurring at any time on Sundays or federal holidays. b. Noise -generating construction equipment operated on site shall be equipped with the most modern and effective noise control devices (i.e., mufflers, lagging, and/or motor enclosures). All equipment shall be properly maintained to assure that no additional noise due to worn or improperly maintained parts would be generated. c. Truck deliveries and haul -off shall use approved haul routes that are away from noise - sensitive locations. d. Noisier construction (e.g., demolition, backhoe operations) activities shall be scheduled during the midday, if feasible, so that a quiet period can be provided. e. The contractor shall notify the existing tenants in advance of any and all construction activities. The construction manager's (or representative) telephone number shall also be provided with the notification so that community concerns can be communicated. f. Construction noise should be monitored during high levels of activity to determine compliance with local noise criteria. In the event that the noise criteria is exceeded, the construction activities would be reviewed to determine whether there are reasonable means to further mitigate the construction noise. g. Mechanical equipment used during the operation of the project shall be acoustically engineered, incorporating quite designs, mufflers, enclosures, parapets, etc., so that noise generated by theses operations would not exceed the noise standard at receptor locations. B. Exposure of persons to or generation of excessive groundborne vibration or groundborne noise levels? Less than significant impact. The proposed project would involve use of equipment or vehicles that could create a substantial groundborne vibration to nearby uses or expose nearby residents to an excessive vibration during demolition activities. These effects are temporary and will cease upon the project completion. The operation of the project will not result in generation of vibration impacts other than impacts that already occur on the site. Therefore, the impacts are considered less than significant, and no mitigation is required. 07/25/10 «PADMJ0701\MND\4.0 Environmental Analysis.doc» 41L'�e* 4-31