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SA-2 Pressure Control Station Relocation <br />and Transmission Main Improvements <br />RFP No. 21-127 <br />Mid -Basin Injection Centennial Park Project I Orange County Water District <br />,1 011HU1, _ . J10-Jf 1 1 .,.,,.......v............... <br />The Mid -Basin Injection Centennial <br />Park Project is located within <br />Centennial Park in the City of <br />Santa Ana. Four injection wells <br />constructed in below ground vaults <br />are proposed to inject 12 mgd of <br />Groundwater Replenishment <br />System water into the principal <br />groundwater aquifer approximately <br />1,200 feet below ground surface. <br />The project consists of the <br />following: <br />Four (4) submersible backflush <br />pumps will be installed within <br />the injection wells with a design <br />flowrate of 3,000 gpm to purge <br />the entire well column and <br />surrounding strata. <br />Each of the four injection wells <br />will require a pipeline <br />connection to deliver the supply <br />water for injection. The source of water for these wells will be the Groundwater Replenishment <br />System pipeline located in the western levee of the Santa Ana River. Approximately 5,700 linear <br />feet of supply pipeline will be constructed to injection wells within Centennial Park. The supply <br />pipeline is proposed to be cement mortar coated and epoxy lined steel pipe, and will vary in size <br />from 36-inch, 16-inch, and 12-inch. The supply line will cross the Santa Ana River which will require <br />the pipeline to be constructed on the newly expanded Edinger Avenue Bridge. <br />Approximately 4,200 linear feet of 16-inch backflush pipeline will be constructed within Centennial <br />Road to convey well backflush discharge to the lake or the Greenville -Banning Channel. <br />A monitoring well is proposed down gradient of the Park's injection wells to monitor the impacts to <br />the groundwater basin. The monitoring well is proposed within the Heritage Museum of Orange <br />County. The area around the monitoring well will be improved and a new irrigation system for the <br />museum farm will be installed. <br />Two (2) Shared Facilities that will be occupied by Orange County Water District and the City of <br />Santa Ana. <br />TETRA TECH <br />