Water Master Plan

230 Pages·2014·32.68 MB·English

Prepared for
City of Antioch
Water System
Master Plan Update
August 2014

Master Plan Update
Prepared for
City of Antioch, Antioch, California
August 2014

Thomas P. Birmingham
California License C 67405
Engineer in Responsible Charge

201 North Civic Drive, Suite 115
Walnut Creek, California 94596

Acknowledgements
Brown and Caldwell acknowledges the valuable contributions made by the City of Antioch in conducting
the Master Plan Update
Specifically, the project team recognizes the following personnel for their efforts:

City Council
Wade Harper, Mayor
Mary Helen Rocha, Mayor Pro Tem
Gary Agopian, Council Member
Monica E. Wilson, Council Member
Tony G. Tiscareno, Council Member

City Staff
Steven Duran, City Manager
Ron Bernal, Public Works Director/City Engineer
Scott Buenting, Associate Engineer
Tim Coley, Acting Superintendent—Water Distribution
Duane Anderson, Superintendent—Water Treatment
Lori Sarti, Water Quality Analyst

Brown and Caldwell Staff
Kevin Kai, Project Manager
Thomas Birmingham
Tina Crawford
William Faisst, Principal-In–Charge
Jenny Gain
Jim Graydon
Alok Gupta
Melanie Holton
Ian Kruljac
Beth Linskens
D’anna McNamer
Kelsi Oshiro, Project Engineer
Deanna Tanner
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Table of Contents
List of Figures ...................................................................................................................................................... v
List of Tables ...................................................................................................................................................... vi
List of Abbreviations ........................................................................................................................................ viii
Executive Summary ...................................................................................................................................... ES-1
Background ................................................................................................................................................... ES-1
Findings and Conclusions ............................................................................................................................. ES-1
Recommendations ........................................................................................................................................ ES-5
1. Introduction ............................................................................................................................................... 1-1
1.1 Authorization ................................................................................................................................... 1-2
2. Existing System and Study Area Characteristics .................................................................................... 2-1
2.1 Service Area Description ................................................................................................................ 2-1
2.2 Existing Sources of Supply ............................................................................................................. 2-1
2.3 Existing Distribution System .......................................................................................................... 2-1
2.3.1 Pressure Zone I ................................................................................................................ 2-8
2.3.2 Zone II ............................................................................................................................... 2-8
2.3.3 Zone III East ...................................................................................................................... 2-9
2.3.4 Zone III West ..................................................................................................................... 2-9
2.3.5 Zone IV East.................................................................................................................... 2-10
2.3.6 Zone IV West .................................................................................................................. 2-10
2.3.7 Land Use Characteristics ............................................................................................... 2-10
2.3.8 Study Area ...................................................................................................................... 2-10
2.3.9 Population Forecasts and Future Development .......................................................... 2-10
3. Projected Water Use ................................................................................................................................. 3-1
3.1 Historical Water Use ....................................................................................................................... 3-1
3.2 Future Water Production Projections ............................................................................................ 3-4
3.3 Average-Day Water Demands ........................................................................................................ 3-5
3.4 Water Demand by Pressure Zone .................................................................................................. 3-6
3.5 Recycled Water Use ........................................................................................................................ 3-8
4. Water Quality and Water Supply .............................................................................................................. 4-1
4.1 Water Quality................................................................................................................................... 4-1
4.1.1 Federal Regulations ......................................................................................................... 4-1
4.1.2 California State Regulations ............................................................................................ 4-9
4.1.3 Potential Future Regulations - Endocrine Disrupting Compounds (EDC):
Pharmaceuticals and Personal Care Products (PPCP) ................................................ 4-11
4.1.4 Emerging Contaminants Review ................................................................................... 4-11
4.1.5 General Physical and Inorganic Parameters of Raw Water Sources .......................... 4-16
4.1.6 Treated Water Analyses ................................................................................................. 4-19
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Table of Contents City of Antioch, Master Plan Update

4.1.7 Conclusion ..................................................................................................................... 4-19
4.2 Water Supply ................................................................................................................................ 4-19
4.2.1 Contra Costa Canal ........................................................................................................ 4-22
4.2.2 Antioch Municipal Reservoir ......................................................................................... 4-23
4.2.3 Local Wells ..................................................................................................................... 4-23
4.2.4 Sacramento/San Joaquin Rivers Delta ........................................................................ 4-23
4.2.5 Impacts of Regulatory Processes for Water Conservation .......................................... 4-24
4.2.6 Methods for Water Conservation .................................................................................. 4-25
4.2.7 Impacts of Regulatory Processes on the Sacramento/San Joaquin Rivers Delta .... 4-27
4.2.8 Desalination Water ........................................................................................................ 4-28
5. Raw Water Conveyance and Treated Water Distribution .......................................................................5-1
5.1 Raw Water System ..........................................................................................................................5-1
5.1.1 River Pumping Station ......................................................................................................5-1
5.1.2 Raw Water Pipeline ..........................................................................................................5-2
5.1.3 Municipal Reservoir ..........................................................................................................5-4
5.1.4 Canal Pumping Stations and Raw Water Transfer Pipes ...............................................5-5
5.2 Treated Water Distribution System ................................................................................................5-8
5.3 Existing System ...............................................................................................................................5-8
5.3.1 Design Criteria ............................................................................................................... 5-10
5.3.2 Water requirements ...................................................................................................... 5-10
5.3.3 Storage and Storage Requirements ............................................................................. 5-10
5.3.4 Storage Requirements .................................................................................................. 5-11
5.3.5 Pressure Requirements ................................................................................................ 5-16
5.3.6 Minimum Pipe Sizes ...................................................................................................... 5-16
5.3.7 Booster Pumping Stations and Pumping Capacity ...................................................... 5-17
5.3.8 Pumping Capacities ....................................................................................................... 5-17
5.3.9 Evaluation of the Existing Water Mains ....................................................................... 5-17
5.4 Future System .............................................................................................................................. 5-19
5.4.1 Zone I.............................................................................................................................. 5-19
5.4.2 Zone II............................................................................................................................. 5-19
5.4.3 Zones III and IV .............................................................................................................. 5-20
5.4.4 Higher Elevation Zones ................................................................................................. 5-21
5.4.5 Seismic Evaluation of Existing Water System .............................................................. 5-21
6. Water Treatment Plant Improvements ....................................................................................................6-1
6.1 WTP Capacity Requirements ..........................................................................................................6-1
6.2 Existing WTP ....................................................................................................................................6-2
6.2.1 Planned WTP Improvements............................................................................................6-3
6.3 Backwash Water and Water Treatment Residuals .......................................................................6-3
6.4 Other Water Treatment Plant Issues..............................................................................................6-4
7. Capital Improvement Program .................................................................................................................7-1
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City of Antioch, Master Plan Update Table of Contents

7.1 Project Priorities.............................................................................................................................. 7-1
7.2 Basis of Estimates .......................................................................................................................... 7-2
7.2.1 Raw Water System ........................................................................................................... 7-2
7.2.2 Distribution System Water Mains ................................................................................... 7-2
7.2.3 Booster Pumping Stations ............................................................................................... 7-2
7.2.4 Reservoir Storage............................................................................................................. 7-3
7.2.5 Water Treatment Plant .................................................................................................... 7-3
7.3 Cost Estimates ................................................................................................................................ 7-3
7.3.1 Raw Water System ........................................................................................................... 7-3
7.3.2 Distribution System .......................................................................................................... 7-4
7.3.3 SCADA System .................................................................................................................. 7-7
7.3.4 Booster Pumping Stations ............................................................................................... 7-7
7.3.5 Reservoir Storage............................................................................................................. 7-7
7.3.6 Water Treatment Plant .................................................................................................... 7-8
8. Limitations ................................................................................................................................................ 8-1
Appendix A: References ...................................................................................................................................... A
Appendix B: Water Model Report ...................................................................................................................... B
Appendix C: Single Page Project Summaries ................................................................................................... C
List of Figures
Figure 2-1. Service Area and Distribution System Facilities ....................................................................... 2-3
Figure 2-2. Existing Water System Schematic ............................................................................................. 2-5
Figure 2-3. Land Use Zoning Map ............................................................................................................... 2-11
Figure 3-1. Historic Water Production........................................................................................................... 3-3
Figure 3-2. Average Day Water Use (1975-2030) ....................................................................................... 3-5
Figure 4-1. Existing Water System Schematic ........................................................................................... 4-21
Figure 5-1. Raw Water Pipelines ................................................................................................................... 5-3
Figure 5-2. Preliminary Route for New Raw Water Pipeline from Antioch Municipal Reservoir to
Water Treatment Plant ............................................................................................................... 5-7
Figure 5-3. Existing Water System Schematic ............................................................................................. 5-9
Figure 5-4. Service Area and Distribution System Facilities ..................................................................... 5-10
Figure 5-5. Fire Flow Map ............................................................................................................................ 5-13
Figure 7-1. Antioch Water System................................................................................................................. 7-4

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Table of Contents City of Antioch, Master Plan Update

List of Tables
Table ES-1. Summary of 20-Year Water System Capital Improvement Plan ........................................... ES-3
Table ES-2. Proposed Higher Priority Projects ........................................................................................... ES-4
Table 2-1. Existing Reservoir Storage and Booster Pumping Station Capacitya .........................................2-6
Table 2-2. Water System Control Valves (Pressure Reducing Valves [PRVs] and Zone Separation) ........2-7
Table 2-3. Pressure Zone Service Elevations ...............................................................................................2-7
Table 2-4. Pipeline Lengths by Diameter by Pressure Zone ........................................................................2-8
Table 2-5. Population by Pressure Zone .................................................................................................... 2-13
Table 2-6. General Plan Land Use by Pressure Zone ................................................................................ 2-14
Table 3-1. Historical Water Production .........................................................................................................3-1
Table 3-2. Historical System Losses .............................................................................................................3-4
Table 3-3. Future Water Production Projections ..........................................................................................3-4
Table 3-4. Projected Total Water Demand Requirements by Pressure Zonea,c ..........................................3-7
Table 4-1. Update of Summary of USEPA Regulations Pertinent to Water Treatment Plant Operations .4-2
Table 4-2. Currently Regulated Microorganisms ..........................................................................................4-4
Table 4-3. US EPA LT2ESWTR Bin Assignment for Cryptosporidium Reduction Requirementsa ..............4-5
Table 4-4. Water Quality Standards for Disinfectants and DBPs ................................................................4-6
Table 4-5. Raw Water Total Coliform Data ....................................................................................................4-8
Table 4-6. Summary of CDPH Drinking Water Regulations .........................................................................4-9
Table 4-7. Fluoride Control Ranges for Treated Water ............................................................................. 4-10
Table 4-8. Regulated Radionuclide Concentrationsa ................................................................................ 4-10
Table 4-9. USEPA UCMR 1 Monitoring List ................................................................................................ 4-12
Table 4-10. USEPA UCMR 2 Monitoring List .............................................................................................. 4-13
Table 4-11. USEPA UCMR 3 Monitoring List .............................................................................................. 4-14
Table 4-12. California Drinking Water Standards and Antioch Treated Water ........................................ 4-15
Table 4-13. California Drinking Water Standards and Antioch Raw Water Analysis ............................... 4-17
Table 4-14. Water Quality Standards for Chloride..................................................................................... 4-18
Table 4-15. 2010 Water Supplies, AFY ...................................................................................................... 4-19
Table 4-16. Supply Reliability – Current Water Sources, AFY ................................................................... 4-19
Table 4-17. Factors Resulting in Inconsistency of Supply ........................................................................ 4-20
Table 4-18. Water Conservation Demand Management Measures Listed in MOU ................................ 4-24
Table 4-19. Proposed Methods to Achieve 2020 Per Capita Water Use Goal ........................................ 4-26
Table 5-1. Nameplate Characteristics ...........................................................................................................5-5
Table 5-2. Summary of Reservoir Information ........................................................................................... 5-10
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