55C - ALTON AVE OVERCROSSING @ SR 55

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Draft Findings of Fact and Mitigation Monitoring Reporting Program (applies to CEQA only) ( ) Significant (x) Not Significant Finding: 1. (x) Changes or alterations have been required in, or incorporated into, the project, which avoid the significant environmental effect. (Subd. [a][l].) 2. () Such changes or alterations are within the responsibility and jurisdiction of another public agency and not the agency making the finding. Such changes have been adopted by such other agency or can and should be adopted by such other agency. (Subd. [a][2].) 3. () Specific economic, legal, social, technological, or other considerations, including provision of employment opportunities for highly trained workers, make infeasible the mitigation measures or project alternatives identified in the Final EIR/EA (Subd. [a][3].) Rationale: Implementation of these mitigation measures will reduce hazardous waste/materials impacts to levels less than significant by ensuring that if the improvements proposed for this project are recommended for implementation, follow-up hazardous material analysis be performed during PS&E and prior to construction to identify impacts from the known and unknown sources, and to prescribe specific mitigation to address these impacts. Thus, any hazardous waste/materials issues would be remediated prior to construction. No further mitigation is required. Reference: The discussion on setting, impacts, and mitigation related to Hazardous Waste/Materials are included in Section 4.3 of the FEIR/EA prepared for the Alton Avenue Overcrossing at SR-55. 7.4 AIR QUALITY Potentially Significant Effects Permanent Impacts - None . No violations of the federal or state one- or eight-hour Carbon Monoxide (CO) standards are predicted with the Preferred Alternative. In the Preferred Alternative Phase 1, CO levels are predicted to slightly increase at both analysis sites. This increase is 0.5 parts per million (ppm) or less for the eight-hour analysis period. In the Preferred Alternative Phase 2, CO levels are lower as compared to CO levels predicted in Phase 1. · There are no indications that the Preferred Alternative would contribute to a particulate matter less than 10mm (PMIO) hot spot that would cause or contribute to the PMIO National Ambient Air Quality Standards (NAAQS). This finding is based, in part, on the inclusion of the project in Southern California Association of Governments' (SCAG's) 2002 RTIP, which accounted for the regional PMIO State Implementation Plan (SIP) budget compliance. It is also based on the PMIO concentrations recorded at California Air Resources Board's (CARB's) Anaheim-Harbor Boulevard Monitoring Station, the closest monitoring station to the study area, which did not violate the NAAQS for the three-year period from 1999 through 2001. There would be no unusual circumstances, such as high diesel truck Alton Avenue Overcrossing at SR-55 K-17 April July 2005 55C-35