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Section 5 <br />To provide water Supply to the injection weils, a water Supply pipeline would be <br />constructed that would extend from the GRWS pipeline at the west levee of the <br />Santa Ana River, along the north side of Edinger Avenue Bridge to the east level <br />of the Santa Ana River. To construct the pipeline, the west and east facing <br />levees would require excavation, All of the construction activity would be outside <br />of the channel and once the pipeline connection is made both levees would be <br />returned to their pre-project condition. The proposed construction activity would <br />not compromise the integrity of both levee structures. The excavation activities <br />into the levee would require an encroachment permit from the County of Orange <br />and a 408 permit from the U.S, Army Corps of Engineers. As part, of the submittal <br />for the encroachment permit and 40B permit, OCWD would submit final design <br />plans that would reflect how the construction activities would not adversely <br />impact the integrity of the west levee and east levee. With the implementation of <br />Mitigation Measures HWQ-4 potential adverse effects associated with <br />construction activities along the west and east levee of the Santa Ana River <br />would be reduced to a, less than significant level. <br />To extend the water supply pipeline from the GWRS pipeline to Centennial Park, <br />the water supply pipeline would need to cross the Santa Ana River, The water <br />supply pipeline would be secured along the north facing nose piers of the <br />Edinger Avenue Bridge and would extend along the entire width of the Santa Ana <br />River, The water supply line would be above the high water mark and would not <br />impede flood flows. The securing of the water supply pipeline to the nose piers of <br />the Edinger Avenue Bridge would not involve any construction activities to the <br />foundation of the bridge structure or the river channel substrate. The placement <br />of the pipeline along the Edinger Avenue Bridge would require an encroachment <br />permit from the County of Orange. As part of the Submittal for the encroachment <br />permit OCWD would submit final design plans that would reflect how the pipeline <br />would be designed and constructed to withstand any inadvertent impact that <br />could occur from County of Orange maintenance activities in the event heavy <br />equipment would be used from the top of the bridge to remove any storm debris <br />that might cling on the bridge nose piers during flood flows. With the <br />implementation of Mitigation Measures HWQ- 4 and HWQ-5 potential adverse <br />effects associated with the placement of the water supply pipeline along the nose <br />pier of the Edinger Avenue Bridge would be reduced to a less than significant <br />level. <br />The Proposed Project would not involve any construction activities to the <br />Greenville Banning Flood Control Chanel that would adversely impact the flood <br />control capacity of the channel. A back flush pipeline has been proposed that <br />would discharge water into an existing gutter catch basin that would drain into the <br />Greenville Banning Flood Control Channel. To avoid potential flooding impacts <br />Mid Basin Centennial Park �g7&2g6Project Final EIR 5-135 <br />4k.'V <br />