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The proposed project would result in the removal of a number of buildings <br />and structures that do not meet current safety standards. This would be a <br />beneficial consequence in terms of reducing the number of unsafe buildings in <br />the area. <br />Mitigation Measures <br />1. As part of the engineering and preparation of design plans, structural <br />and soils engineers will be retained to determine the structural stability <br />of the Santiago Creek Bridge, with regard to a potential subsidence <br />event. These assessments will include recommendations, if needed, to <br />provide adequate structural support for the bridge. <br />2. Consideration will be given to installing and replacing surface level <br />structures such as street lights, traffic signals and utility poles, with <br />structures that have extensive subsurface footings that reach stable <br />material. <br />C. EROSION IMPACTS <br />Consequences <br />Erosion of barren rock and soil surfaces uncovered during excavation could <br />occur under any of the street widening alternatives. Any such erosion would <br />be very minor, due to the slight gradient that exists throughout the project <br />corridor and the relatively small amount of rock or soil surfaces that would be <br />expected. Erosion potential with the banks of the Santiago Creek is primarily <br />a function of the intensity and frequency of storm waters occurring during the <br />rainy season. Reconstruction of the bridge supports, if needed, would occur <br />only during the dry season and would not result in greater erosion of the <br />stream bed than under normal conditions. <br />Mitigation Measures <br />1. If reconstruction of the Santiago Creek Bridge supports is determined <br />to be necessary, construction activities will be limited to the dry season. <br />Design and construction will be coordinated with the Orange County <br />Environmental Management Agency and the State Department of Fish <br />and Game. <br />2. Straw or other suitable materials will be placed over uncovered soils, as <br />needed, during street construction activities. This would reduce the <br />amount of erosion. <br />1V -3 <br />75B -138 <br />