Coso Operating Company/Hay Ranch Hydrologic Monitoring
Data contained herein are preliminary and subject to revision.
Environmental Impact Report Documents
- Overview Map of Rose Valley Hydrologic Monitoring Points (2011)
- Hydrologic Monitoring and Mitigation Plan(Dec 2008)
- Final EIR December 2008 (Large File)
- Draft EIR July 2008 (Large File)
Monthly Monitoring Reports
- Pressure Transducer Hydrographs (updated monthly)
- Manual GWE Hydrographs(updated monthly)
- Flow Hydrographs (updated monthly)
- Hay Ranch Pumping (to date)
EIR/HMMP Updates
- Hay Ranch CUP Modeling & Pumping Update (2-24-22)
- Letter to Coso Operating Company extending pumping period (2024)
- Letter to Coso Operating Company extending pumping period (2021)
- Revised Groundwater Flow Model and Predictive Simulation Results (May 27, 2021)
- Conditional Use Permit #2007-03/Coso Extension of Pumping (November 27, 2018)
- Letter to Coso Operating Company extending pumping period (July 27, 2017)
- Revised Groundwater Flow Model and Predictive Simulation Results (August 24, 2017)
- Letter to Coso Operating Company extending pumping period (August 30, 2013)
- Letter to Coso Operating Company Conditional Use Permit #2007/13 (June 27, 2014)
- Revised Groundwater Flow Model and Predictive Simulation Results (January 28, 2011)
- ICWD Addendum to Hay Ranch CUP HMMP (April 1, 2011)
