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Salt and Nutrient Management Plan for Malibu Valley Groundwater Basin

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Salt and Nutrient Management Plan for Malibu Valley Groundwater Basin Salt andd Nutrient Manage m ent Plan Malibu Valley Groundwater Basin July 14, 2016 11-25 Salt and Nutrient Management Plan Malibu Valley Groundwater Basin Prepared by: July 14, 2016 11-26 Malibu Valley Groundwater Basin Salt and Nutrient Management Plan Acknowledgements Acknowledgements This Salt and Nutrient Management Plan (SNMP) was made possible by the generous financial support from the City of Malibu, and the many organizations and agencies generously dedicated their time to review and comment on project documents, participated in stakeholder meetings and provided vital data for the salt and nutrient analysis and plan development process. The City of Malibu and MVGB stakeholders would like to recognize and thank everyone who contributed to this effort. We would also like to thank the Los Angeles Regional Water Quality Control Board for providing invaluable advice and guidance throughout the entire project, and to the team who prepared the Malibu Valley Groundwater Basin (MVGB) SNMP – your input provided valuable guidance in completion of this document. Finally, we are truly thankful to the City of Malibu staff and consultant team, consisting of RMC Water and Environment and McDonald Morrissey Associates, who worked tirelessly to facilitate and prepare this SNMP. July 14, 2016 i 11-27 Malibu Valley Groundwater Basin Salt and Nutrient Management Plan Table of Contents Table of Contents Chapter 1 Introduction ......................................................................................................................... 1-1 1.1 Purpose of Basin Management Planning .............................................................................. 1-2 1.2 Regulatory Framework.......................................................................................................... 1-3 1.2.1 Regulatory Requirements Related to Groundwater Management ......................................... 1-3 1.2.2 Regulatory Requirements Related to Salt and Nutrient Management ................................... 1-4 1.3 Groundwater Basin Management Objectives ........................................................................ 1-4 1.3.1 Basin Management Goals and Objectives ............................................................................. 1-5 1.3.2 SNMP-Specific Goals ........................................................................................................... 1-6 Chapter 2 Stakeholder Efforts to Develop the SNMP ....................................................................... 2-1 2.1 Advisory Committee ............................................................................................................. 2-1 2.2 Public Involvement ............................................................................................................... 2-1 2.3 Relationships with Local, State and Federal Agencies ......................................................... 2-1 Chapter 3 Groundwater Basin Characteristics .................................................................................. 3-1 3.1 Groundwater Basin Overview ............................................................................................... 3-1 3.2 Land and Water Use .............................................................................................................. 3-1 3.3 Groundwater Resources ........................................................................................................ 3-2 3.3.1 Hydrogeology........................................................................................................................ 3-2 3.3.2 Groundwater Balance Components ....................................................................................... 3-3 3.3.3 Groundwater Quality ............................................................................................................. 3-6 3.4 Surface Water Resources .................................................................................................... 3-11 Chapter 4 Baseline and Future Planning Period Evaluation ............................................................ 4-1 4.1 Indicator Parameters of Salts and Nutrients .......................................................................... 4-2 4.2 Water Quality Objectives ...................................................................................................... 4-3 4.3 TDS and Nitrate Fate and Transport ..................................................................................... 4-3 4.4 Indicator Parameter Analysis Methods ................................................................................. 4-4 4.4.1 Groundwater Quality Averaging Period ............................................................................... 4-4 4.4.2 Evaluation of Existing Ambient Groundwater Quality ......................................................... 4-5 4.5 Existing Groundwater Quality .............................................................................................. 4-5 4.5.1 Total Dissolved Solids .......................................................................................................... 4-5 4.5.2 Sulfate in Groundwater ......................................................................................................... 4-8 4.5.3 Chloride in Groundwater ..................................................................................................... 4-10 4.5.4 Nitrate in Groundwater ....................................................................................................... 4-12 4.6 Source Identification and Loading Analysis ....................................................................... 4-14 4.6.1 Loading Analysis Methodology .......................................................................................... 4-14 4.6.2 Data Inputs .......................................................................................................................... 4-15 4.6.3 Loading Model Results ......................................................................................................... 4-4 4.7 Future Groundwater Quality Analysis ................................................................................ 4-14 4.7.1 Simulation of Future Groundwater Quality under No Project and CCWTF Project Scenarios 4-14 4.7.2 Water Balance Components ................................................................................................ 4-15 4.7.3 Water Quality of Inflows and Outflows .............................................................................. 4-20 4.7.4 Mixing Model and Salt and Nutrient Balance ..................................................................... 4-20 4.7.5 Future Conditions and Scenario Analysis ........................................................................... 4-21 4.8 Model Findings ................................................................................................................... 4-24 Chapter 5 Anti-Degradation Assessment ............................................................................................ 5-1 5.1 CCWTF Project Justification ................................................................................................ 5-1 5.2 California Anti-Degradation Policy Summary ...................................................................... 5-2 July 14, 2016 ii 11-28 Malibu Valley Groundwater Basin Salt and Nutrient Management Plan Table of Contents 5.3 Applicability to the CCWTF Project ..................................................................................... 5-3 Chapter 6 Groundwater Basin Management Plan ............................................................................. 6-1 6.1 Groundwater Basin Management .......................................................................................... 6-1 6.2 Recharge Area Protection ..................................................................................................... 6-1 6.3 Contaminated Groundwater Migration Control .................................................................... 6-1 6.4 Well Construction Policies .................................................................................................... 6-2 6.5 Well Abandonment and Destruction Programs ..................................................................... 6-2 6.6 Mitigation of Overdraft Conditions/Control of Saline Water Intrusion ................................ 6-2 6.7 Coordination and Cooperation with Stakeholders ................................................................ 6-3 6.8 Groundwater Monitoring ...................................................................................................... 6-3 6.8.1 Groundwater Elevation Monitoring ...................................................................................... 6-3 6.8.2 Groundwater Quality Monitoring ......................................................................................... 6-4 6.8.3 Surface Water ...................................................................................................................... 6-11 Chapter 7 SNMP Implementation and Periodic Review ................................................................... 7-1 7.1 Basin-Wide Management Actions ........................................................................................ 7-1 7.1.1 Active Groundwater Management and Adaptation ............................................................... 7-1 7.1.2 Identification and Protection of Natural Recharge Areas
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