19E - SANTA ANA GRADE SEPARATION PROJECT

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Santa Ana Blvd. Grade Separation provisions in Section 14 -8.02, "Noise Control" of the Draft 2010 Standard Specifications and Special Provisions (SSP S5 -310), and applicable local noise standards. The closest residences to the project site are within 50 feet from the project construction areas. Therefore, these residences may be subject to short -term noise reaching 95 dBA maximum sound level (L max) or higher generated by project construction activities. Proposed avoidance and /or minimization measures include: N -1 Comply with the construction hours specified in the City of Santa Ana Municipal Code, Noise Section 18 -314. N -2 Noise control will conform to the provisions in Section 14 -8.02 and Standard Special Provision S5 -310. The noise level from the contractor's operations between the hours of 9:00 p.m. and 6:00 a.m. will not exceed 86 dBA L eq (h) at a distance of 50 feet. This requirement in no way relieves the contractor from responsibility for complying with local ordinances regulating noise levels. The contractor should use an alternative warning method instead of a sound signal unless required by safety laws. In addition, the contractor will equip all internal combustion engines with the manufacturer - recommended mufflers and will not operate any internal combustion engine on the job site without the appropriate muffler. N -3 The sound barriers that are determined to be reasonable and feasible shall be coordinated with the affected property owners. All benefited residents and property owners will be notified should a change in placement or removal of any soundwall occur during the design phase. Additionally, all residents /property owners will be notified of final soundwall locations prior to 100% PS &E. N -4 The contractor will implement appropriate additional noise mitigation measures, including changing the location of stationary construction equipment, turning off idling equipment, rescheduling construction activity, notifying adjacent residents in advance of construction work, and installing acoustic barriers around stationary construction noise sources. 6.2 Air Quality Assessment Report: The Air Quality Assessment Report determined that the project would have no adverse impacts under National Environmental Policy Act (NEPA). The determination is based on the following: • during project construction, the implementation of exhaust and fugitive dust emission control measures would avoid and /or minimize impacts to air quality; the project is included in the Southern California Association of Government's (SCAG) 2008 Regional Transportation Plan (RTP) and SCAG 2011 Federal Transportation Improvement Program (FTIP) (Project ID ORA082610), which implies that project's operational emissions (which include the ozone precursors reactive organic gases (ROG) and oxides of nitrogen (NOX) meet the transportation conformity requirements imposed by EPA and the South Coast Air Quality Management District (SCAQMD). As such, the project would not exceed the motor vehicle emissions budget for the region; PROJECT REPORT EQUIVALENT 19E -23 14