25C - AGMT - OCWD CENTENNIAL PARK

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Section 3 Construction of Water Supply Pipeline Each of the four injection wells would require a pipeline connection to deliver water to the injection well. The source of the water for the injection wells would be the OCWD GWR System pipeline located in the western levee of the Santa Ana River. To access and provide connection to the GRW System pipeline, the western levee would have to be excavated to expose the pipeline. From the GWRS pipeline, the water supply pipeline would extend along the north side nose piers of the Edinger Avenue Bridge, Once across the bridge the pipeline would be placed underground on the eastern levee of the Santa Ana River and then would be extended underground along the south side of Edinger Avenue to the entrance to Centennial Park. Within Centennial Park the water supply pipeline would extend along the alignment of Centennial Loop Road to the injection well sites. The water supply pipeline would be approximately 5,500 feet in length and would have diameters ranging from 36 inches at its connection with GWR System pipeline to 14 inches along the loop road in Centennial Park, The portion of the water supply line within Centennial Park would be constructed at night to maintain access during the day at Centennial Park. Construction of Back Flush Pipeline In order to maintain injection efficiency and longevity of the injections wells, periodic back flushing operations would be necessary. To help conserve water, the water back flushed from the injection wells would be discharged into Centennial Lake with a secondary discharge option into the Greenville Banning Flood Control Channel. The back flush pipeline to Centennial Lake would tie into an existing wet well that was formerly used to irrigate landscape at Centennial Park. The back flush pipeline to Greenville Banning Flood Control Channel would discharge into an existing gutter catch basin and then drain, into the Greenville Banning Flood Control Channel. No modifications to the Greenville Banning Flood Control Chanel Would occur, As shown in Figure 3 the back flush pipeline would generally follow the same alignment of the water supply pipeline. The back flush pipeline would be approximately 4,616 feet in length with a diameter of 18 inches. The back flush pipeline would be constructed at night to maintain access during the day at Centennial Park. Drilling and Construction of Injection Wells at Centennial Park A total of four injection wells have been proposed in Centennial Park. The proposed injection wells would operate 24 hours a day injecting water into the groundwater basin at depth of approximately 1,200 feet. The injection wells would be enclosed and would operate in underground vaults under existing parking areas at Centennial Park, A 5 foot by 5 foot metal cover would be Mid Basin Centennial Park IrL'pa5 te' Project Final EIR 3-6 2 _ gig