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Mid -Basin Injection Centennial Park Project <br />Fountain Valley, California <br />Client Name: <br />Orange County Water <br />District <br />Year Completed: <br />2017 <br />Reference: <br />Orange County Water <br />District <br />18700 Ward Street <br />Fountain Valley, CA <br />92708 <br />Michael Markus, PE <br />714/378-3305 <br />The Mid -Basin Injection Centennial Park Project is located within Centennial Park in the City of Santa <br />Ana. Four injection wells constructed in below ground vaults are proposed to inject 12 MGD of GWRS <br />water into the principal groundwater aquifer approximately 1,200 feet below ground surface. The <br />project consists of the following: <br />• Four (4) Submersible backflush pumps will be installed within the injection wells with a design <br />flowrate of 3,000 gpm to purge the entire well column and surrounding strata. <br />• Each of the four injection wells will require a pipeline connection to deliver the supply water for <br />injection. The source of water for these wells will be the GW RS pipeline located in the western <br />levee of the Santa Ana River. Approximately 5,700 linear feet of supply pipeline will be <br />constructed to injection wells within Centennial Park. The supply pipeline is proposed to be <br />cement mortar coated and epoxy lined steel pipe, and will vary in size from 36-inch, 16-inch, and <br />12-inch. The supply line will cross the Santa Ana River which will require the pipeline to be <br />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 OCWD and the City of Santa Ana. <br />TETRA TECH <br />