25C - AGMT - OCWD CENTENNIAL PARK

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Section 5 Alternative 1: No Federal Action/No Project Under Alternative 1, the project Would not be implemented. There would be no constructed related activities or long term operations that would have the potential to degrade water quality. Alternative 2: Proposed Project The Proposed Project has been evaluated if it would be in conflict with the current State of California's regulations regarding Groundwater Replenishment Reuse Projects and has subsequently been determined that the Proposed Project would provide the required primary and secondary buffer areas. No long term adverse water quality impacts would be associated with the injection of GWRS waters into the groundwater basin. During excavation operations there could be the potential that groundwater could be encountered and dewatering activities Would be needed. The water from the dewatering activities would be discharged into a local storm drain and then into the Greenville Banning Flood Control Channel. To ensure there are no adverse water quality impacts from the dewatering activities OCWD would obtain and implement a NPDES dewatering permit from the Regional Water Quality Control Board, Additionally, mitigation measures have been incorporated into the Proposed Project to minimize Construction related and long-term surface water run off impacts associated with the construction and operation of the Proposed Project. With the implementation of Mitigation Measure G,EO-1, HWQ-2 and HWQ-3 potential adverse water quality impacts would be reduced to a less than significant level. Alternative 3. Reduced Intensity Alternative Under Alternative 3, long term operation water quality impacts would be the same as the Proposed Project and would be less than significant. Under Alternative 3, there would be a reduced amount of construction activity and reduced potential for adverse construction related water quality impacts to occur. Similar to the Proposed Project, mitigation measures have been incorporated into Alternative 3 to minimize construction related and long -term surface water run off impacts. With the implementation of Mitigation Measure GEO-1, HWQ-2 and HWQ-3 potential adverse water quality impacts would be reduced to a less than significant level. Alternative 4., Pipeline Design Alternative Under Alternative 4, long term operation water quality impacts would be the same as the Proposed Project and would be less than significant. Under :010 Mid Basin Centennial Park �gel`,, 1 JProject Final EIR 5-132