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the afternoon peak period on a typical weekday and on a weekend day. The analysis will also address the anticipated parking impacts of the proposed project. Potential measures for mitigating the adverse traffic and parking impacts (if any) will be identified in consultation with the City of Santa Ana. The analysis methodology, assumptions, and findings will be summarized in report sections suitable for insertion into the environmental document. Air Quality Potential air quality Impacts associated with construction and operation of the project will be analyzed in the FIR. The analysis will be based on the South Coast Air Quality Management District's (SCAQMD) methodology for projects in the South Coast Air Basin (SoCAB). Air pollutant emissions will be quantified using the CaIEEMod computer model for both the construction and operational phases. Construction modeling will be based on construction phasing, the construction schedule, and anticipated equipment for each type of construction activity. Air pollutant emissions will be compared to SCAQMD's regional thresholds of significance to determine the significance of project-related construction emissions due to the expansion of the stadium and reconfiguration of the athletic field. Onsite localized project-related emissions associated with vehicle exhaust and dust generated during the construction phase will also be evaluated against SCAQMD's screening-level localized significance thresholds (LSTs) for projects under five acres to determine whether sensitive residential uses along local roadways would be exposed to air pollution that exceeds the ambient air quality standards (AAQS). Project-related emissions will also be evaluated relative to consistency with the air quality management plan. Greenhouse Gas Emissions The FIR will quantify greenhouse gas (GHG) emissions for area sources, energy (purchased energy, energy from water transport, use, and treatment), waste disposal, and transportation emissions sources generated by the project. The potential effects of GHG emissions, history of GHG emissions regulation In California, and project- related GHG emissions will be discussed. Project consistency with the CARB Scoping Plan's statewide GHG emissions reduction strategies will also be reviewed. Noise and Vibration The environmental document will evaluate potential impacts resulting from the construction and operation of the park improvements as suggested in recreational analysis. The noise analyses will be consistent with the noise compatibility standards of the City of Santa Ana. The short-term construction analyses will focus on potential noise and vibration impacts on sensitive land uses such as the onsite school classrooms and local residential uses. Based on the anticipated construction schedule and equipment list, construction-related noise and vibration levels will be calculated for the project using published data from the US Environmental Protection Agency and Federal Transit Administration. The noise analyses will evaluate the potential for project-related traffic and stationary sources to substantially elevate the ambient noise environment. Hazards and Hazardous Materials/Phase I Environmental Assessment The Phase I will be conducted in accordance with the American Society for Testing and Materials (ASTM) Standards on Environmental Site Assessments, ASTM E 1527-05 (ASTM 1527-05). The goal of an ASTM Phase I is to evaluate site history, existing observable conditions, current site use, and current and former uses of surrounding properties to identify the potential presence of "Recognized Environmental Conditions (RECs)" associated with the site. Recognized Environmental Conditions are defined in ASTM E 1527-05 as "the presence or likely presence of any hazardous substances or petroleum products on a property under conditions that indicate an existing release, a past release, or a material threat of a release of any hazardous substances or petroleum products into structures on the property or into the ground, groundwater, or surface water at the property. The term includes hazardous substances or petroleum products even under conditions in compliance with laws. The term is not intended to include de minimis conditions that generally do not present a material risk THE PLANNING CENTERIDC&E I PROPOSAL: RECREATIONAL ANALYSIS/POTENTIAL NEGATIVE DECLARATION FOR MCFADDEN/ORANGE P,%K SITE 11 25A-38