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SAWS' Twin Oaks Aquifer Storage and Recovery Project

SAWS' Twin Oaks Aquifer Storage and Recovery Project. October 11 2010. Texas Innovative Water 2010. Roberto Macias Plant Manager. Project History. Part of SAWS' 50-Year Water Supply Plan, adopted in 1998 3,200 acres purchased in south Bexar, Atascosa, and Wilson counties in 2000 and 2001.

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SAWS' Twin Oaks Aquifer Storage and Recovery Project

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  1. SAWS' Twin Oaks Aquifer Storage and Recovery Project October 11 2010 Texas Innovative Water 2010 Roberto Macias Plant Manager

  2. Project History Part of SAWS' 50-Year Water Supply Plan, adopted in 1998 3,200 acres purchased in south Bexar, Atascosa, and Wilson counties in 2000 and 2001 ASR site • Original project concept was for Carrizo production only • 2002 agreement with Evergreen Underground Water District limited Carrizo production to 6,400 af/year

  3. PropertiesIncludedin WaterResource andManagementAgreement

  4. Project History Facility online in 2004 Phase I included 17 wells and 30 mgd water treatment facility Phase II (completed 2009) included 12 additional wells to increase storage/recovery capacity to 64 mgd Twin Oaks treatment facility • Phase IIA included local Carrizo wells • 7 wells for exclusive Carrizo production • ≈ $250,000,000 invested so far

  5. Changing Operational Plan • Carrizo only • Seasonal benefit • Long-term storage • Both seasonal benefit and long-term storage

  6. Welllocations ASR well monitoring well Carrizo well pilot desal well

  7. Welllocations ASR well monitoring well Carrizo well pilot desal well

  8. Welllocations ASR well monitoring well Carrizo well pilot desal well

  9. Welllocations ASR well monitoring well Carrizo well pilot desal well

  10. Current Work Desalination Pilot Plant

  11. Water in Storage at Twin Oaks 2004 to July 20, 2010 Current storage volume = 81,556 af acre- feet cumulative volume in storage

  12. Existing Permitted Supplies Drought of Record Impact Today (circa 2009) Permitted Supply Gaps 23,851 10,436 37,622 High (126 GPCD) Normal (116 GPCD) Low (106 GPCD)

  13. ASR and Permitted Supply Gap acre- feet demand at 116 gpcd ASR Storage Total Supplies

  14. USGS activities • Completed Scientific Investigations Report Quality of Groundwater at and near an Aquifer Storage and Recovery Site, Bexar, Atascosa, and Wilson Counties, Texas, June 2004 - August 2008 • "no trends that might have been caused by migration of injected Edwards aquifer water were observed" • Continued sampling of 15 off-site wells for water quality • 1 ASR monitor well equipped with a water quality monitor • 3-D model pilot study in progress (in next year’s Joint Funding Agreement). • Will assist in selection of possible new monitoring well site(s)

  15. Storage volume by ASR well Million Gallons Injected

  16. Migration of stored water From CH2MHill Technical Memorandum, South Bexar County ASR Recovery Assessment, Jan. 7, 2004

  17. Mitigation program • 240 wells investigated • 101 wells where mitigation has been completed: • 33 wells had pumps lowered • 59 new wells drilled • 9 wells with no mitigation required

  18. ASR highlights • Project has exceeded all expectations • Water quality does not degrade • Amount of water available for storage and withdrawal has significant impacts on overall water supply plan

  19. Moving forward with ASR • Maintain bank in long-term storage • Explore effective summer peak management strategies • Plan for future studies to understand hydrodynamics of site

  20. SAWS' Twin Oaks Aquifer Storage and Recovery Project October 11 2010 Texas Innovative Water 2010 Roberto Macias Plant Manager

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