20A - AA FIRST ST BRIDGE REPLACEMENT PROJECT

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LSA ASSOCIATES, INC. INITIAL STUDYIMITIGATED NEGATIVE DECLARATION JULY 2010 FIRST STREET BRIDGE REPLACEMENT PROJECT CITY OF SANTA ANA required unless there is no sensitive receptor at that location or there is no outdoor use such as a patio, balcony, or backyard. Calculations have been rounded to the nearest integer in Table 4.1 for ease of expression. Under CEQA, sound barrier walls 2 and 4 are necessary to abate traffic noise with the bridge replacement and road widening. The construction phase of the proposed project will generate short-term construction-related noise that will expose sensitive receptors to some noise levels exceeding City of Santa Ana noise standards. The bridge demolition and pile driving will require use of loud construction equipment and activities, which will take place during the hours allowed by the "City of Santa Ana Noise Ordinance". Loud equipment will be used during the midday to provide quiet hours. Following completion of demolition and street widening, noise associated with the construction will cease. City of Santa Ana Noise Ordinance According to the City of Santa Ana Noise Ordinance Article VI, the City is designated a Zone 1, which means that exterior noise levels during the day (lam-10 pm) should not exceed 55 db, and should not exceed 50 dB during the night (10 pm- 7 am). The City further exempts certain categories of noise (including construction related noise) from this provision. (e) Noise sources associated with construction, repair, remodeling, or grading of any real property, provided said activities do not take place between the hours of 8:00 p.m. and 7:00 a.m. on weekdays, including Saturday, or any time on Sunday or a federal holiday. All construction activities will be in compliance with the City Noise Ordinance, which limits construction-related noise to the hours of 7:00 a.m.-8:00 p.m. weekdays and Saturdays, with no construction allowed at any time on Sundays or federal holidays. Although the City recognizes that construction noise is a nuisance, it acknowledges that noise is an inevitable part of construction activities, which are temporary and necessary for development. Construction activities are generally short-term, and noise from these activities ceases subsequent to the project build out. The Municipal Code exempts construction noise from the noise ordinance by scheduling construction activities during the least noise-sensitive part of the day. Also, to minimize the construction noise impact for sensitive land adjacent to the project site, construction noise is regulated by Caltrans Standard Specifications, Section 5-1, "Sound Control Requirements," in the Standard Special Provisions. These provisions follow: "Sound control shall conform to the provisions in Section 7-1.01I, Sound Control Requirements, of the Standard Specifications and these special provisions. The noise level from the Contractor's operations, between the hours of 9:00 p.m. and 6:00 a.m., shall not exceed 86 dBA at a distance of 50 feet. This requirement in no way relieves the contractor from responsibility for complying with local ordinances regulating noise level. The noise level requirement shall apply to the equipment on the job or related to the job, including but not limited to trucks, transit mixer or transient equipment that may or may not be owned by the contractor. The use of loud signals shall be avoided in favor of light warnings except those required by safety laws for the protection of personnel. Full compensation for conforming to the requirements of this section shall be considered as included in the prices 07/25/10 «PADMJ0701\MND\4.0 Environmental Analysis.doe. 4-30 20A-81