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Chapter 4 Environmental Setting, Impaots, and Mitigation Measures TableOutdoor Construction Phase Noise Levels at 50 Feet(dBA L. J Noise Levels at 50 Feet with Mufflers (dBA L«J Ground Clearing 84 82 Excavation, Grading 89 86 Foundations 78 77 Structural 85 83 Finishing 89 86 SOURCE: U.S. EPA 1971 The following mitigation measures shall be implemented as part of the proposed project: MM4.8-1 All construction activity within the City shall be conducted in accordance with Section 18-314(e) of the City of Santa Ana Municipal Code. MM4.8-2 Each project applicant shall require by contract .rpecications that the following construction best managementpractices (BMPs) be implemented by contractors to reduce construction noise levels: ■ Two weeks prior to the commencement of construction, notification must be provided to property owners within 300 feet of a project site disclosing the construction schedule, including the various types of activities that would be occurring throughout the duration of the construction period ■ Ensure that construction equipment is properly muffled according to industry standards and be in good working condition ■ Place noise -generating construction equipment and locate construction staging areas away from sensitive uses, where feasible ■ Schedule high noise producing activities between the hours of 8:00 A.M. and 5:00 P.M. to minimitie disruption on sensitive uses ■ Implement noise attenuation measures, which may includz, but are not limited to, temporay noire 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 super ntendent 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 reportingpardy. 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 pr ject applicant shall require by contract spec -cations that construction staging areas along with the operation of earthmoving equipment within the project area would be located as far away from vibration and noise sensitive sites as possible. Contract specifications shall be included in the proposed 4.8-22 City of Santa Ana Transit Zoning Code (SD 84A and SD 84B) EIR