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Section 5 <br />Monthly, the monitoring well at the Heritage MUSPUM Site Would be back flushed <br />as part of the water sampling activities. An average 4,000 to 5,000 gallons of <br />water would be either containerized or discharged in the local storm water <br />system and then into the Greenville Banning Flood Control Channel. The amount <br />of water discharged into the storm water system would not reduce the flood <br />control capacity of the Greenville Banning Flood Control Channel and would not <br />cause localized flooding. <br />Alternative 3: Reduced Intensity Alternative <br />Under Alternative 3, one less injection well would be developed. Assuming a <br />worst case that all three wells were back flushed in one day, a total of 210,000 <br />gallons of water would be discharged into Centennial Lake. The water level in the <br />take Would rise .9 inches. During dry periods the back flushing would not cause <br />the water elevation in Centennial Lake to spill over into the Greenville Banning <br />Flood Control Channel or topple and cause localized flooding in Centennial Park. <br />Similar to the Proposed Project, during wet periods, OCWD would coordinate <br />with the County of Orange to determine if there would sufficient flood control <br />capacity within the Greenville Banning Flood Control Channel. With the <br />implementation of Mitigation Measure HWQ-1 potential flood risks along the <br />Greenville Banning Flood Control Chanel would be reduced to a less than <br />significant level. <br />Alternative 4: Pipeline Design Alternative <br />Under Alternative 4, back flushing operations would be same as the Proposed <br />Project. With the implementation of Mitigation Measure HWQ-1 potential flood <br />risks along the Greenville Banning Flood Control Chanel would be reduced to a <br />less than significant level. <br />Mitigation Measures <br />HWQ-1: Prior to construction operations OCWD will obtain an encroachment <br />permit from the County of Orange that allows for the discharging of groundwater <br />from the Mid Basin Centennial Park Injection Well Project into the Greenville <br />Banning Flood Control Channel. <br />Level of Impact after Mitigation <br />Alternative 1. No adverse impact <br />Alternative 2 Less than significant with Mitigation Measure HWO-1. <br />Alternative 3: Less than significant with Mitigation Measure HWQ-1. <br />Alternative 4: Less than significant with Mitigation Measure HWQ-1. <br />Mid Basin Centennial Park y <br />I ri 'reject Final EIR 5-126 <br />1-il <br />