Temecula Valley Basin Salt and Nutrient Management Plan
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Temecula Valley Basin Salt and Nutrient Management Plan Prepared by: In Association with: GEOSCIENCE Support Services, Inc. Michael Welch REVE Environmental, Inc. March 2014 Temecula Valley Basin Salt and Nutrient Management Plan Acknowledgements The development of the Temecula Valley Basin Salt and Nutrient Management Plan was possible only through the contributions of a large group of stakeholders and technical experts. The following are recognized for their efforts towards the development of this document: Warren Back, Rancho California Water District Charles Binder, Santa Margarita River Watershed Watermaster Jim Blanke, RMC Water and Environment Leasa Cleland, Elsinore Valley Municipal Water District Jayne Joy, Eastern Municipal Water District Scott Goldman, RMC Water and Environment Denise Landstedt, Rancho California Water District Scott Lynch, RMC Water and Environment Khalique Khan, United States Marine Corps – Camp Pendleton Base Brenda Meyer, Western Municipal Water District John Odermatt, San Diego Regional Water Quality Control Board Fisayo Osibodu, San Diego Regional Water Quality Control Board Jason Uhley, Riverside County Flood Control and Water Conservation District Michael Welch, Consulting Engineer Dennis Williams, GEOSCIENCE Support Services, Inc. Richard Williamson, Rancho California Water District Anders Wistrom, REVE Environmental, Inc. Johnson Yeh, GEOSCIENCE Support Services, Inc. Thank you for your contribution of time, data, and expertise. Funding for the preparation of this document has been provided by the following: A California Department of Water Resources Integrated Regional Water Management Planning Grant Rancho California Water District Eastern Municipal Water District March 2014 i Temecula Valley Basin Salt and Nutrient Management Plan March 2014 ii Temecula Valley Basin Salt and Nutrient Management Plan March 2014 iii Temecula Valley Basin Salt and Nutrient Management Plan March 2014 iv Temecula Valley Basin Salt and Nutrient Management Plan Table of Contents List of Acronyms and Abbreviations ........................................................................................... ix Executive Summary .............................................................................................................. ES-1 Chapter 1 Introduction .........................................................................................................1-1 1.1 Purpose Statement ................................................................................................1-4 1.2 Study Area.............................................................................................................1-4 1.3 Regulatory Background .........................................................................................1-5 1.4 Stakeholder Process ........................................................................................... 1-11 1.5 Water Needs ....................................................................................................... 1-17 1.6 Groundwater Management within the Basin ........................................................ 1-18 Chapter 2 Basin Characterization and Groundwater Quality .............................................2-1 2.1 Basin Description ...................................................................................................2-1 2.2 Existing Groundwater Quality for Salt and Nutrient Analysis ..................................2-9 2.3 Historical Groundwater Quality Trends ................................................................ 2-15 2.4 Variability of Groundwater Levels and Quality with Depth .................................... 2-22 Chapter 3 Source and Loading Analysis .............................................................................3-1 3.1 Methodology ..........................................................................................................3-1 3.2 Loading Analysis Summary ................................................................................. 3-11 Chapter 4 Goals and Water Management Strategies ..........................................................4-1 4.1 Goals .....................................................................................................................4-1 4.2 Water Management Strategies ..............................................................................4-3 Chapter 5 Groundwater Quality Trend Analysis .................................................................5-1 5.1 Approach ...............................................................................................................5-1 5.2 Existing Water Quality ...........................................................................................5-8 5.3 Projected Groundwater Quality Trends ..................................................................5-9 5.4 Summary of Projected Changes in Water Quality ................................................ 5-20 Chapter 6 Implementation Plan ...........................................................................................6-1 6.1 Monitoring and Evaluation .....................................................................................6-1 6.2 Prevention .............................................................................................................6-2 6.3 Planning ................................................................................................................6-2 6.4 Salt and Nutrient Program Management ................................................................6-3 6.5 Schedule of Activities ............................................................................................6-3 6.6 California Environmental Quality Act (CEQA) Compliance .....................................6-4 Chapter 7 Conclusions .........................................................................................................7-1 Chapter 8 References ...........................................................................................................8-1 March 2014 v Temecula Valley Basin Salt and Nutrient Management Plan List of Tables Table ES-1 Groundwater Basin Plan Objectives for Areas within the Temecula Valley Basin .... v Table ES-2 Initial Stakeholder Groups Established .................................................................... v Table ES-3 Goals for Recycled Water Use within the Study Area, by 2035 (AFY) .................... vi Table ES-4 Long-Term TDS Concentrations from Groundwater Quality Trend Analysis, Pauba Aquifer .............................................................................................................................. viii Table ES-5 Long-Term Nitrate (as NO3) Concentrations from Groundwater Quality Trend Analysis, Pauba Aquifer ..................................................................................................... ix Table ES-6 Long-Term TDS Concentrations from Groundwater Quality Trend Analysis, Temecula Aquifer ............................................................................................................... ix Table ES-7 Long-Term Nitrate (as NO3) Concentrations from Groundwater Quality Trend Analysis, Temecula Aquifer ................................................................................................. x Table ES-8 Recommended Implementation Actions ............................................................... xiii Table 1-1 Groundwater Basin Plan Objectives for Areas within the Temecula Valley Basin . 1-11 Table 1-2 Initial Stakeholder Groups Established ................................................................. 1-12 Table 1-3 Stakeholder Meeting Participants ......................................................................... 1-14 Table 2-4 Basinwide Average Annual Groundwater Budget, Simulated Existing Conditions .. 2-6 Table 2-5 Averaged Concentrations within Each Hydrologic Subarea, 2008-2012, Temecula Aquifer ........................................................................................................................... 2-15 Table 3-6 Water Quality Parameters for Loading Model Potable Water Sources .................... 3-6 Table 3-7 Landscape and Agriculture Loading Inputs ............................................................. 3-8 Table 3-8 Water Quality Parameters for Loading Model Recycled Water Sources ................. 3-8 Table 3-9 Water Quality Parameters for Septic Systems ........................................................ 3-9 Table 3-10 Average Annual Mass Loading of TDS, Existing Land and Water Use Conditions ...................................................................................................................................... 3-12 Table 3-11 Average Annual Nitrate (as NO3) Loading, Existing Land and Water Use Conditions ...................................................................................................................................... 3-13 Table 4-12 Goals for Recycled Water Use within the Study Area, by 2035 (AFY) .................. 4-3 Table 5-13 Projected Change in Land Use Classification, Existing Conditions to Future Conditions ....................................................................................................................... 5-5 Table 5-14 Projected Change in Septic Systems, Existing Conditions to Future Conditions ... 5-6 Table 5-15 Probable Range of Average Concentrations within Each Hydrologic Subarea, 2008- 2012 ...............................................................................................................................