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ASCE OC - EWRI: OCWD Mid-Basin Injection: Centennial Park Project
The document outlines the Mid-Basin Injection project at Centennial Park, managed by the Orange County Water District, aimed at recharging groundwater using treated wastewater and improving local water levels. It details project components, timelines, budgets, stakeholder involvement, and construction logistics for the groundwater replenishment expansion to reach a capacity of 130 mgd. The project includes construction phases, permits required, and impacts on local facilities and residents.
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ASCE OC - EWRI: OCWD Mid-Basin Injection: Centennial Park Project
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- 2. Orange County Water District • CA special district, manage groundwater in central & north Orange County • Water supply to 19 agencies, serving >2.4 million •Groundwater Replenishment System (GWRS): wastewater to drinking water • Seawater intrusion barrier in Fountain Valley & Huntington Beach • Santa Ana River and lakes to capture & recharge water • 2,150± acres land above Prado Dam: water conservation, storage, & quality • Green Acres Project: disinfected tertiary for non‐potable uses
- 3. Overview of GWRS Projects • GWRS Original Project (Completed 2008) – 70 MGD treatment facility with future expansion capacities, injection wells, and 13.8 mile pipeline •GWRS Initial Expansion (Completed 2015) – Expansion to 100 MGD, flow equalization • GWRS Final Expansion (Completion ~2023) – Expansion to 130 MGD, pump station, water supply pipeline, & treatment process reconfiguration at OC Sanitation District Plant 2
- 4. Recharge of GWRS Water Total GWRS Final Expansion capacity = 130 MGD MBI 8 MGD Burris Basin Outlet& Pump Station 20 MGD GWRS Final Expansion 130 MGD Talbert Seawater Barrier > 15 MGD Recharge Facility Recharge Capacity Talbert Seawater Barrier > 15 MGD Mid‐Basin Injection 1.5 + 6.5 MGD Burris Basin Outlet 20 MGD Anaheim Recharge Basins 87 MGD TOTAL 130 MGD Recharge Basins 87 MGD
- 5. Project Location June 2017 Principal Aquifer Contours CENTENNIAL PARK Why Centennial Park? – Raise local water levels – Next to MBI Demonstration project –Next to existing GWRS pipeline – Recharge GWRS water with 4 wells – Reduce nearby well pumping energy – Reduce amount of GWRS water that must be recharged in Anaheim
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- 7. Site Stakeholders • City • Park Users •Nearby Residents • Santa Ana College • Godinez High School • Mitchell School • Heritage Museum
- 8. Santa Ana MOU & License • Federal & State approvals required • MOU and License outline: –Site Use Restrictions • Max. 6 month impact to single location – General Project Concept • No permanent loss of park use • Wells below grade in parking lots • Not interrupt park uses during construction – Site Improvements • Asphalt Paving • Shared Structures • Lake Replenishment
- 9. MBI‐1 Components - Connect to GWRS & Cross Edinger Bridge - 1.9 Miles Supply & Backflush Pipes (night‐time) -2 Air‐Gap Structures - 4 Injection Wells in Vaults (24‐hour drilling, ~1,100 ft) - 2 CMU Shared Structures - 2 Monitoring Wells (~1,200 ft) - Grind & Cap Paving (9.6 ac) - Skate Park Camera/Fence - Process Control System
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- 13. Project Timeline Event Dates Execute MOUwith City of Santa Ana July 2014 Certify EIR/EA April 2016 Execute City Agreement and SAUSD Easement June 2016 Design Jul 2015 – Feb 2017 Financing Application Apr 2016 – Jul 2017 Execute Second SAUSD Easement (SAR-13) April – June 2017 Award MBI-2017-1 Construction July 2017 Construct MBI-2017-2 (SAR-13) Aug – Dec 2017 Submit Title 22 MBI Eng. Report Supplement February 2018 Hold Required DDW Public Hearing July 2018 Obtain Regional Board Permit Amendment December 2019 Begin Operation of MBI Centennial Park Wells Spring 2019 Complete MBI-2017-1 Construction January 2020
- 14. Budget & Funding Description Budget Pre-Design TechnicalStudies $ 64,705 Design Services $ 1,145,099 Easements $ 50,400 Permitting $ 50,000 Construction Contract $ 23,107,567 Construction Contract (First Monitoring Well) $ 1,138,380 Construction Management Civil Construction Management $ 1,155,932 Well Construction Management $ 564,170 Project Contingency $ 2,323,747 Total Project Budget $ 29,800,000 SRF Loan (1.7% interest, 30 years) $27,300,000 Green Project Grant $ 2,500,000
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- 21. • 16”/ 12” supply injection pipeline • 16” backflush pipeline •Instrumentation controls duct bank • Existing utilities Centennial Road CONSTRUCTION
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- 27. • Air gap into lake through abandoned irrigation system • Lake evaporation •Backflush reduces potable water refill • Backflush event raises lake by ½‐inch Backflush Discharge to Lake
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- 34. • OCWD electrical room • City locker rooms •City public bathrooms Shared Structure 1
- 35. • Same location as existing bathroom • OCWD electrical room •City office for skate park • City public bathrooms Shared Structure 2
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- 37. • Improved irrigation system for Gospel Swamp Farm • Garden beds •Improving educational farming facility Heritage Museum Improvements
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- 40. Critical Components MULTIPLE DEPARTMENT PERMITTINGMULTIPLE DEPARTMENT PERMITTING • Public Works • Parks and Recreation •Planning/ Building • Police Department • Fire Authority • School District OCWDOCWD SANTA ANA Planning & Building SANTA ANA Planning & Building SANTA ANA Public Works SANTA ANA Public Works SANTA ANA Parks & Recreation SANTA ANA Parks & Recreation SANTA ANA Police Department SANTA ANA Police Department Orange County Fire Authority Orange County Fire Authority SANTA ANA Unified School District SANTA ANA Unified School District
- 41. Critical Components POTHOLING DURING DESIGN PHASEPOTHOLING DURING DESIGN PHASE • Open cut across entire width of street • Soil conditions: unconsolidated sand •Existing street alignment within curved street 410 ft radius 310 ft radius
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