20A - AA FIRST ST BRIDGE REPLACEMENT PROJECT

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LSA ASSOCIATES, INC. INITIAL STUDY/MITIGATED NEGATIVE DECLARATION JULY 2010 FIRST STREET BRIDGE REPLACEMENT PROJECT CITY OF SANTA ANA Therefore, with the implementation of mitigation measures the proposed project would not conflict or obstruct implementation of State GHG policies or directives, AQMP or Congestion Management Program during construction activities. Less than significant impacts are expected with mitigation. B. Violate any stationary source air quality standard or contribute to an existing or proposed air quality violation? Less than significant with mitigation. Implementation of the project will result in some short-term construction impacts that would temporary increase pollutants emission levels. Because the proposed project does not introduce new land use type, operational impacts will be similar to existing project conditions. The proposed project is expected to improve traffic movement in the project vicinity, thereby lowering the total pollutants emitted by motor vehicles in the long-term. The proposed project would not create a substantial Hot spots for CO, PM 2.5 or PM 10 and thus would not constitute CO, PM 10 or PM 2.5 violation. Construction activities will produce combustion emission from various sources such as site grading, utility engines, on-site heavy-duty construction vehicles, equipment hauling materials to and from the site, and motor vehicles transporting the construction crew. Exhaust emissions will vary on a daily basis as the construction activity levels change. SCAQMD Rule 403 for reducing the fugitive dust emissions (PM10), Best Available Control Measure (BACM), Caltrans Standard Specifications of Construction and Mitigation Measures AQ-1 through AQ-4 will be incorporated during construction time, thereby reducing the temporary air quality impacts to less than significant levels. The following are standard conditions that would reduce or minimize air pollutant emissions [particularly fugitive dust (PM10)] associated with construction activities: • The construction contractor shall adhere to the requirements of SCAQMD rules and regulations on cutback and emulsified asphalt paving materials. • To reduce fugitive dust emissions the construction contractor shall adhere to the requirements of SCAQMD Rule 403. The Best Available Control Measures (BACMs) specified in SCAQMD's Rule 403 shall be incorporated into the project construction. With the incorporation of the mitigation measures AQ-1 through AQ-5 the project would not violate or contribute to violation of existing and proposed air quality standards. Less than significant impacts are expected with the incorporation of the mitigation measures. Compliance with the standard measures articulated in mitigation measure AQ-5 would lessen the fugitive dust (PM10) impact during construction. Mitigation Measure AQ-5 Prior to issuance of final plans for bids, the following conditions shall be included as specifications and notes on the plans to ensure implementation. • The construction contractor shall adhere to the requirements of SCAQMD rules and regulations on cutback and emulsified asphalt paving materials. 07/25/10 «P:\DMJ070l\MND\4.0 Environmental Analysis.doc» 4-7 20A-58