2014 Clear Creek Technical Team Report for the Coordinated Long-Term Operation Biological Opinions Integrated Annual Review October 3, 2014

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  Aquatic Ecosystem Stressors in the Sacramento-San Joaquin Delta

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  Aquatic Ecosystem Stressors in the Sacramento-San Joaquin Delta

  Public Policy Institute of California (PPIC) | May 5, 2012...

  Summary

  This report presents results from an analysis of the institutional and legal options for more effective ecosystem management in the Sacramento-San Joaquin Delta....

  This report presents results from an analysis of the institutional and legal options for more effective ecosystem management in the Sacramento-San Joaquin Delta. It is part of a wide-ranging study on the management of multiple ecosystem stressors in the Delta. .

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  Gates and Barriers in the Delta

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  Gates and Barriers in the Delta

  | April 8, 2013...

  Summary

  While previous Delta Watermaster reports have dealt mainly with water rights and water supply issues, Water Code section 85230 (d) specifies that reports...

  While previous Delta Watermaster reports have dealt mainly with water rights and water supply issues, Water Code section 85230 (d) specifies that reports shall also be submitted on water quality issues and conveyance operations. The use of barriers and gates in the Delta addresses both of these topics.

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  Challenges Facing the Sacramento-San Joaquin Delta: Complex, Chaotic, or Simply Cantankerous?

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  Challenges Facing the Sacramento-San Joaquin Delta: Complex, Chaotic, or Simply Cantankerous?

  Delta Stewardship Council | April 9, 2015...

  Summary

  In 2014, the California Natural Resources Agency and the U.S. Department of the Interior asked the authors of this paper, as four former...

  In 2014, the California Natural Resources Agency and the U.S. Department of the Interior asked the authors of this paper, as four former leaders of The Delta Science Program, to summarize the challenges faced by water supply and ecological resource managers in this critically important region of Northern California. They concluded that the challenges are so
  complex as to meet the definition of a “wicked” problem. Such problems can’t be ignored, defy straightforward characterization, and have no simple solutions. Yet they must be actively managed to maximize
  beneficial and minimize adverse outcomes.

  In this context, the following paper calls for Delta management to become more nimble and better coordinated.

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  Potential Impacts of Future Geological Storage of CO2 on the Groundwater Reservoirs in California’s Central Valley

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  Potential Impacts of Future Geological Storage of CO2 on the Groundwater Reservoirs in California’s Central Valley

  California Energy Commission (CEC) | May 1, 2013...

  Summary

  This study assessed the history of oil production and pressure changes in the southern portion of the San Joaquin Basin in California’s Central...

  This study assessed the history of oil production and pressure changes in the southern portion of the San Joaquin Basin in California’s Central Valley as a reverse analog for understanding the pressure response to potential geologic carbon sequestration.

  Sequestration involves injecting carbon dioxide into permeable strata such as those that trap oil. This results in pressure increases in the existing fluid in the subsurface that can provide a motive force for brines at those depths to migrate into groundwater, affecting its quality. The pressure can also cause differential ground surface uplift that can affect surface water flow, particularly in engineered water conveyances such as canals.

  The strata underlying the Central Valley have been assessed as having considerable capacity to store carbon dioxide, but the area also contains urban areas and extensive agriculture that rely on engineered surface water delivery systems and groundwater supplies. The Stevens Sand, Temblor Formation and Vedder Formation were identified as having the largest cumulative net production from typical geologic carbon sequestration depths.

  Two oil pools were identified in each of these stratigraphic units for more detailed analysis, which included converting fluid level data to pressure at the pool scale. Data were collected that allowed an assessment of the hydraulic connectivity of each unit. The results indicated that the Vedder was hydraulically connected at the near basin scale, the Stevens was hydraulically connected at the pool scale and was disconnected between pools and the Temblor was disconnected within pools. Researchers used these results to analyze possible brine leakage driven by geologic carbon sequestration. They also reviewed over 200 articles on historic groundwater contamination. They concluded that no instance of contamination due to upward leakage of brine in the Central Valley was reported.

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