Ojai Basin Groundwater Management Plan Update, 2018

Ojai Basin Groundwater Management Plan Update, 2018

- 1 - OBGMA Groundwater Management Plan - 2018 Update August 30, 2018 OJAI BASIN GROUNDWATER MANAGEMENT AGENCY GROUNDWATER MANAGEMENT PLAN – 2018 UPDATE ......................................................................................................................................... 5 Administrative Information ......................................................................................................................... 5 Introduction to Administrative Information .................................................................................... 5 General Information ........................................................................................................................................ 6 Management Plan Executive Summary............................................................................................... 6 Agency Information ......................................................................................................................................... 7 Agency Background ............................................................................................................................... 7 OBGMA Mission Statement ................................................................................................................. 9 Fundamental Principles .................................................................................................................... 11 Sustainable Groundwater Management .......................................................................................... 11 OBGMA Compliance ............................................................................................................................ 12 Report Prepared Supporting Alternative Demonstration ................................................... 13 GROUNDWATER MANAGEMENT PLAN OBJECTIVES, MANAGEMENT ACTIVITIES, AND MONITORING PROTOCOLS ............................................................................................................................ 13 Management Plan Objective 1: Understand the Basin Hydrology ............................................. 14 Monitoring. .................................................................................................................................................. 14 Data Collection. .......................................................................................................................................... 14 Well Permitting and Registration....................................................................................................... 15 Extraction Measurement. ...................................................................................................................... 15 GW Extraction Form Correction and adoption by the BOD ................................................ 16 Self-reporting corroboration ........................................................................................................... 16 Computer Modeling. ................................................................................................................................ 17 Management Plan Objective 2: Protect and Manage the Basin ................................................... 18 Water Exports from the Basin. ............................................................................................................ 18 Conjunctive Water Use Management. ............................................................................................... 19 Develop Conjunctive Use Policy for coordination with CMWD ......................................... 19 Establishment of Thresholds and Triggers. ................................................................................... 19 Water levels at key wells during springtime-high (proxy for basin wide storage) ... 22 Discharge points of groundwater to surface water in San Antonio Creek and its relation to perched and deeper groundwater elevations .................................................... 22 - 2 - OBGMA Groundwater Management Plan - 2018 Update August 30, 2018 Water quality (elevated chloride, sulfate, and odor issues). ............................................... 22 New Well Location and potential interference ........................................................................ 22 Well performance (sanding, scaling, aeration, cavitation, and dry issues) .................. 22 Subsidence .............................................................................................................................................. 22 Peak water level known and reported by June meeting each year: ensuing actions 22 Soft Allocation ............................................................................................................................................ 23 Establish springtime high storage ................................................................................................. 23 INSIDE – Invasive Species Identification and Eradication ....................................................... 23 Management Plan Objective 3: Encourage Supporting Activities .............................................. 23 Data Collection and Storage. ................................................................................................................ 23 Additional depth-discrete monitoring wells ............................................................................. 23 Additional data loggers ..................................................................................................................... 24 Water Conservation. ................................................................................................................................ 24 Contour farming practice group .................................................................................................... 24 Abandoned Wells. ..................................................................................................................................... 25 Abandoned Well Inspection program .......................................................................................... 25 Artificial Recharge. ................................................................................................................................... 25 Lower basin spreading grounds .................................................................................................... 26 Ojai Basin Desalter ................................................................................................................................... 26 Watershed Management. ....................................................................................................................... 27 Upper Ventura River Groundwater Basin Sustainability Agency ..................................... 27 Co-operation Agreement (Inter-basin) with UVRGA ........................................................ 27 Management Plan Objective 4: Communicate Effectively ............................................................. 27 Ad hoc Advisory Committees ............................................................................................................... 28 Annual Report ............................................................................................................................................ 28 Key avenues for outreach and communications .......................................................................... 28 Management Plan Objective 5: Administrate Efficiently ............................................................... 28 Funding. ........................................................................................................................................................ 29 Link Budget with extraction fees ................................................................................................... 29 Development of fixed cost base wellhead fee and extraction rates ................................. 29 Recognition and regulation of De Minimis Users ......................................................................... 29 DESCRIPTION OF OJAI BASIN AND EXISTING CONDITIONS ............................................................ 30 Ojai Basin Geology ........................................................................................................................................ 33 - 3 - OBGMA Groundwater Management Plan - 2018 Update August 30, 2018 Ojai Basin Groundwater Recharge.......................................................................................................... 34 Ojai Basin Groundwater Storage and Key Water Levels ................................................................ 38 Ojai Basin Groundwater Extractions ..................................................................................................... 43 Ojai Basin Groundwater Natural Discharge ........................................................................................ 45 Summer pools at San Antonio Creek ....................................................................................... 46 Shallow Perched system vs. deep production system ........................................................... 46 Ojai Basin Groundwater Quality .............................................................................................................. 49 Reference List ...........................................................................................................................................

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