Aquifer Storage & Recovery City of Tigard
IndonesiaAquifer Storage and Recovery
A Presentation for
O=oer 20-25 2003
Internationa'City Managers Association
Resource City Program Cilh,of Tigard RepresentatiVeV
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General Information
The City of Tigard:
♦ Suburb of Portland, Oregon
♦ Serves 49,000 Customers
♦ Provide 2 billion gallons of water annually
- Peak Daily Demand=14.3 MGD
-Average Daily Demand.=6.4 MGD
♦ Has No Ownership in a Water Source
Water Sources
♦ Tigard purchases water from:
- City of Portland(Bull Run Watershed)
- JWG(Trask/Tualatin River Watershed)
♦ Investigating ownership irr a water supply
♦ Untii,then, must design a suppiystrafegy
Tigard's ASR Program
♦ Identified ASR as a way of:
- Development of interim peak seasonsupply
Lowering peak day supply costs
Lowering peak season supply costs
Began ASR feasibility in June 2000
Aquifer Storage & Recovery
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Implementation
• Phase L Feasibility Assessment
♦ Phase II; ASR Pilot Testing
♦ Phase III: Licensing &Operation
Phase I: Assessment
Findings-
♦ ASR is feasible
♦ Possible 4 billion gallons of storage
Columbia River Basalt Group
- Dewatered Aquifer
• No adverse impacts of injection
s No adverse impacts of withdrawal
Phase II: Pilot Testing
♦ Designed to gather:
- Hydraulic data
- Water quality data
♦ Demonstrate:
- Aquifer hydraulic response to ASR
Well performance(injection/storage/recovery)
Goals of the Pilot Test
Determine the Feasibility of-
♦ 180 Million Gallon ASR Program
• Meeting all Regulatory Criteria
• Recovery Rate of Stored Water
♦ Water Quality of Recovered Water
• Ultimate Capacity of the Aquifer
New Assets
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New Assets
Drilling a new 600 feet-deep w
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Constructing _ New Well Hous
Operation of ASR
♦ Integrate ASR into Operations
♦ Monitoring Requirements
♦ Constraints of a Pilot Test/Limited License.
♦ Start=Up Issues
♦ Disinfection
♦ Back flushing
Data Management/Monitoring
♦ Daily Monitoring
-Turbidity
Flow
Specific Capacity
♦ Monthly Monitoring
- Water Levels
♦ Regulated Monitoring/Sampling
Outcomes
♦ Currently Implementing Phase III
- Injecting 1.1 MGD
- Expect to Inject 135- 140 MG
Expect to Recover 1.4 MGD
Regular Operations,Testing and Reporting
♦ Planning the construction of 211d ASR Well
Lessons Learned
♦ Effect of ASR on Distribution System&Vice-Versa
Turbidity
♦ Expect Delays
♦ Provide Good Public Education
♦ Utilize Local Experience
♦ Understand and Accept the Risk Involved
♦ Establish,Communication Plan with Project Team
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Next Steps
Implement Full-Scale ASR Program:
♦ Develop Additional Injection Wells
s Total Storage Capacity of 400 MG
♦ Injection Rate of 120 MG/Well
Withdrawal Rate of 4-6 MGD
s Recovery Periodof3-4 Months/Year
Phase II
♦New Production Well
♦New Test Well
♦Traditional Design/Build Bid
Approach
Project Team
♦City Staff
Council Approval
—Citizen Acceptance
Funding
♦Consultant
--Technical Knowledge
Experience
Project Team
♦Hydrogeologist
—Specific Technical Knowledge of Aquifer
+Contractor
-Weil Drilling
Construction of Well House
Questions