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Chapter 2 CEQA Findings Impact Statement Evidence/Rationale Supporting Findings 314(e) of the City of Santa Ana Municipal Code. Mitigation Measure MM4.8-2 would require that the construction contractor incorporate Best Management Practices (BMPs) that would reduce noise levels at sensitive receptor sites, including Garfield School during construction activities associated with the Developer Project. MM4.8-2 would require the use of noise attenuation measures, including the erection of temporary sound barriers, the use of electric generators and compressors and the staging of construction equipment away from sensitive uses. The use of temporary sound barriers would reduce construction related noise by approximately 10 dBA. The use of such sound barriers as well as the distance of the classrooms from the proposed Developer Project (approximately 200 feet) would result construction related noise levels at Garfield School of approximately 62 dBA Leq (construction noise dissipates by 6 dBA per doubling of distance). Noise levels would be further reduced inside the classrooms due to the attenuation provided by the classrooms (typically 10- 15 dBA reduction), Therefore, with the implementation of the identified mitigation measures, construction related noise levels would be reduced to below 55 dBA for the interior of classrooms, and impacts to students would be less than significant. Mitigation Measures feasible Schedule high noise-producing activities between the hours of 8:00 A.M. and 5:00 P.M. to minimize disruption on sensitive uses Implement noise attenuation measures, which may include, but are not limited to, temporary noise barriers or noise blankets around stationary construction noise sources Use electric air compressors and similar power tools rather than diesel equipment, where feasible Construction-related equipment, including heavy-duty equipment, motor vehicles, and portable equipment, shall be turned off when not in use for more than 30 minutes Construction hours, allowable workdays, and the phone number of the job superintendent shall be clearly posted at all construction entrances to allow for surrounding owners and residents to contact the job superintendent. If the City or the job superintendent receives a complaint, the superintendent shall investigate, take appropriate corrective action, and report the action taken to the reporting party. Contract specifications shall be included in the proposed project construction documents, which shall be reviewed by the City prior to issuance of a grading permit. MM4.8-3 Each project applicant shall require by contract specifications that construction staging areas along with the operation of earthmoving equipment within the project area would be located as far awav from Findings Level of Significance after Mitigation Transit Zoning Code (SD 84) EIR Findings of Fact/Statement of Overriding Considerations 2-35