Draft 2025 Urban Water Management Plan

Table of Contents

11.1 HISTORY .............................................................................................................. 11-1

11.2 SUMMARY OF GROUNDWATER QUALITY ISSUES ..........................................11-1

11.3 MONITORING OF GROUNDWATER QUALITY ...................................................11-1

11.4 DESCRIPTION OF MANAGEMENT PROGRAMS................................................11-2

11.5 DEFINITION OF SIGNIFICANT AND UNREASONABLE DEGRADATION OF WATER QUALITY ..............................................................................................................11-2

11.6 DETERMINATION OF MINIMUM THREHOLDS...................................................11-3

SECTION 12. MANAGING SEAWATER INTRUSION.......................................................12-1

SECTION 13. MANAGING LAND SUBSIDENCE .............................................................13-1

SECTION 14. MANAGING GROUNDWATER DEPLETIONS IMPACTING SURFACE WATER

14-1

SECTION 15. PROTOCOLS FOR MODIFYING MONITORING PROGRAMS..................15-1

15.1 ESTABLISHMENT OF PROTOCOLS FOR WATER QUALITY.............................15-1

15.2 ESTABLISHMENT OF PROTOCOLS FOR GROUNDWATER ELEVATION/STORAGE ............................................................................................................................. 15-1

SECTION 16. PROCESS TO EVALUATE NEW PROJECTS ...........................................16-1

SECTION 17. LIST OF REFERENCES AND TECHNICAL STUDIES...............................17-1

Figure

Figure 1-1. La Habra Groundwater Basin................................................................................ 1-2

Figure 2-1: Cities of La Habra and Brea within Basin 8-1. ....................................................... 2-1

Figure 3-1: Historical La Habra Groundwater Basin (DWR, 1934. DWR, 1937)....................... 3-2

Figure 3-2. La Habra Groundwater Basin................................................................................ 3-2

Figure 3-3: Groundwater Elevation Monitoring Wells............................................................... 3-6

Figure 3-4: Early Well Hydrograph. 1922 Through 1975. ........................................................ 3-7

Figure 3-5: Groundwater Level Hydrographs. ......................................................................... 3-8

Figure 3-6: Depth to Groundwater........................................................................................... 3-8

Figure 3-7: Recent Groundwater Level Hydrograph. ............................................................... 3-9

2017 BASIN 8-1 ALTERNATIVE

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Appendix F - 12

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