25C - AGMT - OCWD CENTENNIAL PARK

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Section 8 excavated to expose the pipeline. Frorn the GWRS pipeline, the water supply pipeline would extend from along the nose piers of the Edinger Avenue Bridge. Once across the bridge the pipeline would be placed underground on the east facing levee of the Santa Ana River and then would be extended underground along the south side of Edinger Avenue to the entrance of 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, 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. 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 2,300 feet in length with a diameter of 18 inches. 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 constructed at the finished grade of the parking lot to provide access into each vault. Each vault would be approximately 260 square feet and Would be excavated to a depth of 15 feet below the ground surface. The drilling activities for each injection well would require continuous 24 hour drilling over a three month period. During the well drilling phase, a work area averaging about 12,200 square feet would be needed for each well site. To minimize the temporary loss of parking area, after the well drilling activities are completed the work area would be reduced to 3,000 square feet to construct each well. A total of three months would be needed to construct each well after well drilling is completed. Shared Recreation✓Communication Structures Power and communication would be required at each injection well. The electrical, communication and process control equipment power would be shared Mid Basin Centennial Park Aq&g6Project Final EIR 8-2