55C - ALTON AVE OVERCROSSING @ SR 55

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Draft Findings of Fact and Mitigation Monitoring Reporting Program (applies to CEQA only) . Dewatering of contaminated groundwater, or discharging of contaminated soils via surface erosion is prohibited. HYD-3 The City of Santa Ana and the City of Irvine have each agreed to maintain (clean) the portion of the relocated channel lying within their respective jurisdictions, while Caltrans would be responsible for structural maintenance of the section of the box culvert located under the freeway. With Mitigation the Effects are Found to be: ( ) 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][1].) 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 EIRIEA (Subd. [a][3].) Rationale: Implementation of these mitigation measures will reduce impacts to hydrology, water quality, and stormwater runoff to levels less than significant by ensuring that design and construction of the Preferred Alternative meet the requirements of the Countywide Drainage Area Management Plan, that a SWPPP is prepared for the project, and that both stormwater and non-stormwater BMPs are implemented. No further mitigation is required. Reference: The discussion on setting, impacts, and mitigation related to Hydrology, Water Quality, and Stormwater Runoff are included in Section 4.2 of the FEIRIEA prepared for the Alton Avenue Overcrossing at SR-55. 7.3 HAZARDOUS W ASTE/MA TERIALS Potentially Significant Effects Permanent Impacts No permanent hazardous waste/materials impacts would occur associated with the operation of the Preferred Alternative, as it is assumed that any hazardous waste/materials issues would be remediated prior to construction. Temporary Impacts (Construction) The proposed project is not anticipated to pose a substantial risk of an explosion or the release of hazardous substances in the event of an accident, or to otherwise adversely affect overall public safety. Based on the analyses performed as part of the Initial Site Assessment (1999), Alton Avenue Overcrossing at SR-55 K-12 April July 2005 55C-30