2005-099 - Overriding Considerations for the Alton Avenue Overcrossing at the SR-55 Freeway Project

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Draft Findings of Fact and Mitigation Monitoring Reporting Program (applies to CEQA only) Mitigation: Identified potentia] impacts are anticipated to be less than significant with the following measures, which are considered standard industry practices. Seismic . Detailed geotechnical studies will be performed in conjunction with detailed engineering designs to provide appropriate boring, soil, and fault information. Hinged restrainers will be used to hold together overcrossing elements during extreme motion. Reinforcement in column sections will be increased to assure effective confinement of concrete, allowing large movements to occur without collapse. . . Liquefaction . Piles will be used under the overcrossing. . Tensile reinforcement will be used in embankments. Expansive Soils . In construction areas where soils are highly expansive, compaction of the highly expansive soils will occur prior to construction. Erosion . Any fills placed near the Orange County Flood Control District (OCFCD) open trapezoidal channel (Lane Channel), will be suitably protected against erosion, including culverts to pass the flow uninterrupted. . Excavated materials will not be deposited or stored in or alongside Lane Channel where materials can be washed away by high water or storm runoff. . Permanent erosion control measures, such as hydroseeding, landscaping, and riprap protection, will be implemented and included on approved construction plans. . Any off- or on-site drainage facilities affected by the proposed project will be designed to comply with City of Santa Ana, City of Irvine, and Caltrans design standards. With Mitigation the Effects are Found to be: ( ) Significant (x) Not Significant Finding: I. (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].) Alton Avenue Overcrossing al SR.55 K-9 KeSolutl<llPFlI9Iu~99 Page 21 of 49