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Wastewater System Master Plan Update i City of Yuba City g:\adminasst\jobs\2005\0570009_yubacityww_mstrplnupdate\09-reports\9.09-reports\master plan\03-06\text\yuba city master plan.doc 3/10/06 11:05 AM

Table of Contents

List of Tables................................................................................................................................ iv

List of Figures.............................................................................................................................. vii

List of Appendices........................................................................................................................ ix

List of Acronyms and Abbreviations.............................................................................................. x

Executive Summary ....................................................................................................................... I

Section 1: Introduction ............................................................................... 1-1 1.1 Introduction .........................................................................................1-1

Section 2: Wastewater Flow and Characteristics Projections.................. 2-1 2.1 Introduction .........................................................................................2-1 2.2 Yuba City Existing and Projected Population ......................................2-1

2.2.1 Yuba City Planning Area .........................................................2-1 2.2.2 Existing and Projected Population...........................................2-2 2.2.3 Water Conservation Measures ................................................2-3

2.3 Existing WTF Influent Flow..................................................................2-3 2.3.1 Historical Influent Flow ............................................................2-3

2.3.1.1 Historical Plant Influent Flow Evaluation................2-3 2.3.1.2 Influent Flow Breakdown .......................................2-6 2.3.1.3 Domestic Per Capita Flow Rate Estimation ...........2-8

2.4 Projected Influent Flows......................................................................2-9 2.5 Evaluation of Existing and Projected Pollutant Loads .......................2-11

2.5.1 Historical Plant Influent Pollutants .........................................2-11 2.5.1.1 Historical Plant Influent Pollutants Loads

Evaluation ............................................................2-11 2.5.1.2 Pollutant Load Breakdown (BOD and TSS).........2-14

2.5.2 Domestic Per Capita BOD and TSS Rate Estimation ...........2-16 2.6 Projected Pollutant Loads .................................................................2-17 2.7 Summary of Future Flows and Loads ...............................................2-21

Section 3: Capacity Assessment of Existing System and Development of New Collection Trunks ................................... 3-1

3.1 Introduction .........................................................................................3-1 3.2 Description of the Model......................................................................3-1

3.2.1 Existing Model Conversion and Update to Current Conditions................................................................................3-2

3.2.2 Model Verification ....................................................................3-4 3.2.3 Development of Peaking Factors ............................................3-5

Table of Contents (cont'd)

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3.3 Existing Collection System Capacity ...................................................3-6 3.4 Future Required Collection System Capacity......................................3-7

3.4.1 Model Alternatives ...................................................................3-8 3.4.1.1 Alternative 1 – Current Planned Growth

Projections within the Sphere of Influence.............3-8 3.4.1.2 Alternative 2 – Directed Growth within the

SOI.........................................................................3-9 3.4.1.3 Alternative 3 – Current Planned Growth

Projections within the Sphere of Influence using Alignments along Future General Plan Parkways ...............................................................3-9

3.5 Conceptual Design............................................................................3-10 3.5.1 Key Design Criteria................................................................3-10

3.5.1.1 Alternative 1.........................................................3-10 3.5.1.2 Alternative 2.........................................................3-11 3.5.1.3 Alternative 3.........................................................3-13

3.6 Current Unsewered Areas.................................................................3-13

Section 4: Wastewater Treatment Facility Process Evaluation................ 4-1 4.1 Introduction .........................................................................................4-1 4.2 WTF Condition Assessment and Performance Evaluation .................4-2

4.2.1 Existing Treatment Facilities....................................................4-3 4.2.2 Current Plant Operation (2001 – 2005) ...................................4-3 4.2.3 Condition Assessment.............................................................4-4 4.2.4 Liquid Treatment Processes....................................................4-4

4.2.4.1 Headworks.............................................................4-4 4.2.4.2 Grit Basin ...............................................................4-6 4.2.4.3 Primary Clarifiers ...................................................4-7 4.2.4.4 Aeration Basins......................................................4-9 4.2.4.5 Secondary Clarifiers.............................................4-13 4.2.4.6 Disinfection Facilities ...........................................4-16 4.2.4.7 Effluent Pumping, Metering and Outfall

Structure ..............................................................4-18 4.2.5 Solids Handling Processes....................................................4-20

4.2.5.1 Dissolved Air Flotation Thickeners (DAFT)..........4-20 4.2.5.2 Digesters..............................................................4-22 4.2.5.3 Dewatering System..............................................4-26

4.2.6 Odor Control Facility..............................................................4-28 4.2.7 Septage Handling System.....................................................4-28 4.2.8 Main Liquid Process Piping ...................................................4-28 4.2.9 Yard Piping............................................................................4-30

4.3 Grease Receiving Station..................................................................4-30 4.4 Summary of the Capacity of the Unit Processes and Main Liquid

Treatment Piping...............................................................................4-30


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4.5 Summary of the Condition of the Unit Processes..............................4-33 4.6 Electrical Evaluation..........................................................................4-37

4.6.1 Technical Data.......................................................................4-37 4.6.2 Evaluation..............................................................................4-37

Section 5: Survey of Opportunities for Wastewater Reclamation and Reuse ......................................................................................... 5-1

Section 6: Capacity Expansion and Capital Improvement Program ......... 6-1

6.1 Introduction .........................................................................................6-1 6.2 Projected Flows...................................................................................6-1 6.3 Proposed Plant Expansion..................................................................6-2 6.4 Plant Expansion by 2010 (Firm Capacity) ...........................................6-5

6.4.1 WTF Capacity Evaluation ........................................................6-5 6.4.2 Project Description and Probable Project Cost Estimate ......6-11

6.4.2.1 New Grit Removal Facility....................................6-11 6.4.2.2 New Primary Sedimentation Tank No. 3..............6-11 6.4.2.3 Existing Aeration Basins 1, 2 and 3

Rehabilitation .......................................................6-12 6.4.2.4 New Secondary Clarifier No. 4 and

Improvements to Existing Secondary Clarifiers No. 1 and 2 ...........................................6-12

6.4.2.5 Existing Effluent Pumps and Outfall.....................6-13 6.4.2.6 New Digester No. 3..............................................6-14 6.4.2.7 Existing Digester Improvements ..........................6-14 6.4.2.8 New Sludge Thickening Facility ...........................6-15 6.4.2.9 Refurbishment of the Original BFP Unit...............6-16

6.4.3 Summary of the 2010 Capacity Expansion ...........................6-16 6.5 Plant Expansion by 2020 (Firm Capacity) .........................................6-19

6.5.1 WTF Capacity Evaluation ......................................................6-19 6.5.2 Projects Description and Probable Project Cost Estimate.....6-24

6.5.2.1 New Chlorine Contact Tank No. 3 .......................6-24 6.5.2.2 New Thickening GBT Unit No. 3 ..........................6-24 6.5.2.3 Main WTF Liquid Treatment Piping .....................6-25

6.5.3 Summary of the 2020 Capacity Expansion ...........................6-25 6.6 Plant Expansion by 2030 (Firm Capacity) .........................................6-26

6.6.1 WTF Capacity Evaluation ......................................................6-26 6.6.2 Population Growth Scenario in Accordance with the

2004 General Plan (Low Growth Scenario)...........................6-30 6.6.3 Projects Description and Probable Project Cost Estimate.....6-31

6.6.3.1 Screening Facility Improvements.........................6-31 6.6.3.2 Influent Pumping Station Improvements ..............6-32 6.6.3.3 New MBR Facility.................................................6-32


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6.6.3.4 New Digester No. 4..............................................6-33 6.6.3.5 New Dewatering Belt Filter Press (BFP) No. 3 ....6-33

6.6.4 Summary of the 2030 Capacity Expansion ...........................6-33 6.7 Electrical Upgrades ...........................................................................6-36 6.8 Energy Conservation Measures........................................................6-37 6.9 Summary of Proposed Projects and Probable Project Cost

Estimate ............................................................................................6-38 6.10 Other Effluent Disposal Alternatives..................................................6-45

6.10.1 Alternative 1: Discharge to Feather River Meeting CTR Requirements (No Nanofiltration) ..........................................6-45

6.10.2 Alternative 2: Discharge to Feather River with Effluent Filtration Followed by UV.......................................................6-46

6.10.3 Alternative 3: Discharge to Feather River with Effluent Nanofiltration .........................................................................6-47

6.10.4 Alternative 4: 100% Recycle with Effluent Storage ...............6-47 6.10.5 Nitrification.............................................................................6-48

Section 7: Collection System Capital Improvement Program and Summary CIPP ........................................................................... 7-1

7.1 Introduction .........................................................................................7-1 7.2 CIP for Alternative 1 ............................................................................7-2

7.2.1 CIPP for Alternative 2 ..............................................................7-3 7.2.2 CIPP for Alternative 3 ..............................................................7-4

7.3 Summary of Capital Improvement Program Project Costs..................7-5

List of Tables

Table ES-1: Yuba City Population Growth ................................................................................ II Table ES-2: Master Plan Update Assumptions ......................................................................... II Table ES-3: Projected Wastewater Flows and Characteristics ................................................ III Table ES-4: Average Operating Data used in Desktop Unit Process Review......................... IV Table ES-5: Summary of CIPP Costs for WWTP and Collection System ............................. VIII Table 1-1: Yuba City Population Growth .............................................................................1-1 Table 2-1: Yuba City Estimated Population Growth ............................................................2-2 Table 2-2: Historical Influent Flow (Year 1996 – 2000) .......................................................2-4 Table 2-3: Historical Influent Flow (Year 2000 – 2004) .......................................................2-5 Table 2-4: Statistical Analysis of Peaking Factors (Data are based on January 2001

through August 2005) .........................................................................................2-6 Table 2-5: Average Annual Flow Breakdown ......................................................................2-7 Table 2-6: Historical Effluent Flow (Year 2000 – 2004) .......................................................2-7


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Table 2-7: Per Capita Flow Rates for the Period from 2000 - 2004.....................................2-8 Table 2-8: Per Capita Flow Rates for the Period from 1996 through 2004..........................2-8 Table 2-9: Future Flow Projections for the Total Planning Area ..........................................2-9 Table 2-10: Comparison of Current and Previous Flow Projections for the Total

Planning Area for the Year 2020 ......................................................................2-10 Table 2-11: Historical Pollutants Loads (Year 1996 – 2000) ...............................................2-11 Table 2-12: Historical Pollutant Loads (Year 2000– 2004) ..................................................2-12 Table 2-13: Statistical Analysis of Peaking Factors for BOD and TSS Concentrations

(Data are based on January 2001 through August 2005 records) ...................2-13 Table 2-14: BOD-TSS Peaking Factors for the Period from 1996 through 2004.................2-14 Table 2-15: Average Annual Domestic/Commercial Pollutants Loads Breakdown .............2-15 Table 2-16: Per Capita BOD and TSS Rates for the Period from 2000 – 2004...................2-16 Table 2-17: Per Capita BOD/TSS Rates for the Period from 1996 through 2004

(with exception for the Year 1997)....................................................................2-16 Table 2-18: Future BOD/TSS Load Projections for the Total Planning Area

(includes City)...................................................................................................2-18 Table 2-19: BOD/TSS Projected Loads Comparison between Actual and Previous

Evaluation for the Total Planning Area for the Year 2020 ................................2-20 Table 2-20: Master Plan Update Assumptions ....................................................................2-21 Table 2-21: Projected Wastewater Flow and Characteristics ..............................................2-21 Table 3-1: Per Capita Flow Rates for the Period from 2000 - 2004.....................................3-3 Table 3-2: Per Capita Flow Rates for the period from 1996 through 2004 ..........................3-3 Table 3-3: Summary of Flow Monitoring..............................................................................3-4 Table 3-4: Peaking Factors Used In the Model ...................................................................3-6 Table 3-5: Area Maximum Population and Wastewater Flows for Current Walton

Avenue Trunk Growth Capacity Analysis ...........................................................3-7 Table 3-6: Model Flow Results ............................................................................................3-9 Table 3-7: Proposed Lift Stations Requirements for Alternative 1.....................................3-11 Table 3-8: Proposed Lift Station Requirements for Alternative 2 Phase 1 ........................3-12 Table 3-9: Proposed Lift Station Requirements for Alternative 2 Phase 2 ........................3-12 Table 3-10: Proposed Lift Station Requirements for Alternative 3.......................................3-13 Table 3-11: Summary of Model Analysis Results for the Addition of Unsewered Users

to the Collection System...................................................................................3-14 Table 4-1: NPDES Permit CA0079260 Effluent Requirements (6 June 2003) ....................4-1 Table 4-2: Primary Clarifiers Technical Data .......................................................................4-7 Table 4-3: Primary Clarifiers Operations Parameters..........................................................4-8 Table 4-4: Aeration Basins Technical Data .........................................................................4-9 Table 4-5: Aeration Basins Operations Parameters ..........................................................4-10 Table 4-6: Secondary Clarifiers Technical Data ................................................................4-14 Table 4-7: Secondary Clarifiers Operations Parameters ...................................................4-15 Table 4-8: CCT and Dechlorination Basins Technical Data ..............................................4-16 Table 4-9: Chlorine Contact Tanks Operations Parameters..............................................4-17 Table 4-10: DAFT Technical Data .......................................................................................4-20 Table 4-11: DAFT Operations Parameters ..........................................................................4-21 Table 4-12: Digesters Technical Data .................................................................................4-23


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Table 4-13: Digesters Operations Parameters ....................................................................4-24 Table 4-14: Belt Filter Presses Technical Data ...................................................................4-27 Table 4-15: BFP Operations Parameters ............................................................................4-27 Table 4-16: WTF Liquid Piping Capacity .............................................................................4-29 Table 4-17: Main Liquid Treatment Piping Capacity............................................................4-30 Table 4-18: Summary of the Unit Process Capacities .........................................................4-31 Table 4-19: WTF Installed Capacity and Condition Assessment Findings ..........................4-34 Table 4-20: Summary of Existing Loads Conditions at 480 Volts........................................4-37 Table 6-1: Projected Flows ..................................................................................................6-1 Table 6-2: Installed and Firm Capacities for the WTF Unit Processes - Current .................6-3 Table 6-3: Recommended Unit Process Expansion by 2010 ..............................................6-7 Table 6-4: Installed and Firm Capacities for the WTF Unit Processes -

Available by 2010 .............................................................................................6-17 Table 6-5: Recommended Unit Process Expansion by 2020 ............................................6-22 Table 6-6: Installed and Firm Capacities for the WTF Unit Processes -

Available by 2020 .............................................................................................6-25 Table 6-7: Recommended Unit Process Expansion by 2030 ............................................6-29 Table 6-8: Installed and Firm Capacities for the WTF Unit Processes -

Available by 2030 .............................................................................................6-34 Table 6-9: Summary of Total Loads Including Projected Additions Conditions

at 480 Volts.......................................................................................................6-36 Table 6-10: Project Summary and Project Cost-Estimates .................................................6-39 Table 6-11: Yuba City WTF CIP ..........................................................................................6-41 Table 7-1: Yuba City Population Growth .............................................................................7-1 Table 7-2: Summary of Alternative 1 Capital Costs.............................................................7-3 Table 7-3: Summary of Capital Costs Alternative 2.............................................................7-4 Table 7-4: Summary of Capital Costs Alternative 3.............................................................7-5 Table 7-5: Alternative 1 without Recycled Water.................................................................7-6 Table 7-6: Alternative 1 with Recycled Water......................................................................7-8 Table 7-7: Alternative 2 Phase 1 without Recycled Water.................................................7-10 Table 7-8: Alternative 2 Phase 1 with Recycled Water......................................................7-12 Table 7-9: Alternative 3 without Recycled Water...............................................................7-15 Table 7-10: Alternative 3 with Recycled Water....................................................................7-18 Table 7-11: Summary of CIPP Costs for WWTP and Collection System ............................7-19


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List of Figures

Figure ES-1: 2030 Scenario with Pipe ID Labels, Alternative 1.............................................. XIV Figure ES-2: 2030 Scenario with Pipe ID Labels, Alternative 2............................................... XV Figure ES-3: Land Use Areas Collection System, Model Results with Catchments,

Alternative 3....................................................................................................... XVI Figure 1-1: General Plan Land Use Areas............................................................................1-3 Figure 1-2: Specific/Master Plans Areas...............................................................................1-4 Figure 2-1: Yuba City Population Growth .............................................................................2-3 Figure 2-2: Average Annual, Maximum Day Flow and Maximum Hourly Flow

(Year 2000 – 2004).............................................................................................2-5 Figure 2-3: Future Flow Projections for the Total Planning Area ........................................2-10 Figure 2-4: Average Annual BOD Load, Maximum Day BOD Load

(Year 2000 – 2004)...........................................................................................2-12 Figure 2-5: Average Annual TSS Load, Maximum Day TSS Load

(Year 2000 – 2004)...........................................................................................2-13 Figure 2-6: Future BOD Load Projections for the Total Planning Area...............................2-19 Figure 2-7: Future TSS Load Projections for the Total Planning Area................................2-19 Figure 2-8: Projected Wastewater Characteristics for the Total Planning Area..................2-22 Figure 3-1: Original 1997 Hydra Model...............................................................................3-15 Figure 3-2: Pipes in the 2005 Base Model..........................................................................3-16 Figure 3-3: Collection System Flow Monitoring Locations ..................................................3-17 Figure 3-4: Specific – Master Plans and Collection System Model Results,

Alternative 1......................................................................................................3-18 Figure 3-5: Catchments for Alternative 1 ............................................................................3-19 Figure 3-6: 2030 Scenario with Pipe ID Labels, Alternative 1.............................................3-20 Figure 3-7: Specific – Master Plans and Collection System Model Results,

Alternative 2......................................................................................................3-21 Figure 3-8: Catchments for Alternative 2 ............................................................................3-22 Figure 3-9: 2030 Scenario with Pipe ID Labels, Alternative 2.............................................3-23 Figure 3-10: Land Use Areas Collection System Model Results with Catchments,

Alternative 3......................................................................................................3-24 Figure 3-11: Sewered and Unsewered Areas.......................................................................3-25 Figure 3-12: Areas Included in Update of 1997 Hydra Model and in Walton Avenue

Analysis ............................................................................................................3-26 Figure 4-1: Site Plan .............................................................................................................4-5 Figure 5-1: Summary of California Recycled Water Regulations..........................................5-3 Figure 5-2: Land Use Areas with Potential for Use of Recycled Water ................................5-4 Figure 6-1: WTF Projected Flows .........................................................................................6-2 Figure 6-2: Installed and Firm Capacities for the WTF Unit Processes – Current ................6-4 Figure 6-3: Required Firm Capacity by 2010 ........................................................................6-6


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Figure 6-4: Site Plan Proposed Plant Expansion Projects..................................................6-10 Figure 6-5: Installed and Firm Capacities for the WTF Unit Processes –

Available by 2010 .............................................................................................6-18 Figure 6-6: Required Firm Capacity by 2020 ......................................................................6-20 Figure 6-7: Installed and Firm Capacities for the WTF Unit Processes -

Available by 2020 .............................................................................................6-26 Figure 6-8: Required Firm Capacity by 2030 ......................................................................6-28 Figure 6-9: Installed and Firm Capacities for the WTF Unit Processes -

Available by 2020 .............................................................................................6-31 Figure 6-10: Installed and Firm Capacities for the WTF Unit Processes -

Available by 2030 .............................................................................................6-35 Figure 7-1: 2030 Scenario with Pipe ID Labels, Alternative 1.............................................7-26 Figure 7-2: 2030 Scenario with Pipe ID Labels, Alternative 2.............................................7-27 Figure 7-3: Land Use Areas Collection System Model Results, Alternative 3 ....................7-28 Figure 7-4: Specific and Master Plans and Collection System Model Results,

Alternative 1......................................................................................................7-29


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List of Appendices

Appendix A1 Historical Data Appendix A2 Hourly Data 2000-2004 Appendix A3 Sunsweet Data Appendix A4-1 YC Effluent Monthly Summary Appendix A4-2 YC Effluent Monthly Summary Appendix B1 Sanitary Sewer Flow Monitoring Results Appendix B2 Model Scenario Output Listing Appendix C1 Yuba City WWTF-Permit R5-2003-0085 Appendix C2 Primary Clarifier Performance Appendix C3 Mixed Liquor Monthly Data Appendix C4 RAS Monthly Data Appendix C5 Thickeners Data Appendix C6 Digesters Data

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List of Acronyms and Abbreviations

% percent BFP Belt Filter Press BOD biochemical oxygen demand CCT chlorine contact tank cf cubic feet CIP Capital Improvement Program CIPP Capital Improvement Program Project City City of Yuba City CMU Concrete Masonry Unit CTR California Toxics Rule DAFT dissolved air flotation thickeners Deg F degrees Fahrenheit FLA Full Load Amps ft feet gal gallon GBTs gravity belt thickeners gpcd gallons per capita per day gpd gallons per day gpm gallons per minute gpm/sf gallons per minute per square foot h hour H2O Map MWH Soft’s H2OMap Sewer™ HMI human interface station HP horse power HVAC heating, ventilating, and air-conditioning IRWM Integrated Regional Water Management kVA Kilovolt amps kW kilowatts lb pound lb pcd pounds per capita per day lb/sf/d pound per square foot per day M&E Metcalf and Eddy MBR membrane bioreactor

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MCC Motor Control Centers MF microfiltration mg/l milligrams per liter MGD/mgd million gallons per day min minute MWH Montgomery Watson Harza NF nanofiltration NTU nephelometric turbidity unit NWRI National Water Research Institute PD Peak Demand PDF Peak Demand Factor PG&E Pacific Gas and Electric Company pH potential of Hydrogen PLCs Programmable Logic Controllers POAS Pure Oxygen Activated Sludge Qavg average flow Qpeak peak flow RAS return activated sludge rpm revolutions per minute RST rotary screen thickener SCADA Supervisory Control and Data Acquisition System sf square feet SOI sphere of influence TDH total dynamic head TDS total dissolved solids TSS total suspended solids TWAS thickened waste activated sludge UV ultraviolet VS volatile solids VSS volatile suspended solids WAS waste activated sludge WTF wastewater treatment facility YCWA Yuba County Water Agency

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Executive Summary

The Yuba-Sutter Region is currently experiencing unprecedented growth and the trend is slated to continue. New home construction plus several annexations has made Yuba City the fourth fastest growing city in the state by percentage change (Yuba Sutter Development Corporation June 2005). Development in the City’s Sphere of Influence is limited by a lack of sanitary sewer infrastructure and wastewater treatment facility capacity. In order to prepare for expected growth in the western part of the sphere of influence (SOI), the City has updated its Wastewater System Master Plan. This plan was originally drafted in October 1997. The scope of the plan covers the collection system and wastewater treatment system within the City Limits. This Update to the Wastewater System Master Plan focuses on the collection system within the SOI and expected impacts to the wastewater treatment system due to growth within the City’s current boundaries and within the SOI. The planning horizon for this update is the year 2030. Currently, the City owns, operates and maintains a wastewater collection, treatment and disposal system that provides sewerage services to approximately 45,000 residents and businesses. The Wastewater Master Plan update includes the following sections: ● Section 1 – Introduction -this section provides the background setting for the Master Plan

Update.

● Section 2 – Population projections – this section develops and provides the population growth basis and wastewater flow basis for assessment of the wastewater treatment system and development of hydraulic models for the collection system.

● Section 3 – Capacity Assessment of Existing Collection System and Development of New Collection Trunks – This section provides the model results and recommendations for three alternative collection system alignments in the City’s Sphere of Influence.

● Section 4- Wastewater Treatment Facility Process Evaluation and Capital Improvement Program.

● Section 5 – Survey Of Opportunities For Wastewater Reclamation And Reuse – this section provides a brief survey of water reuse opportunities in the Sphere of Influence

● Section 6 – Capacity Expansion and Capital Improvement Program – this section develops the Capital Improvement Program for the wastewater treatment facility.

● Section 7 – Collection System Capital Improvement Program – this section develops the Capital Improvement Program for the collection system alternatives developed in Section 3.

● Appendixes containing detailed collection system and wastewater treatment cost information.

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Technical Basis for the Master Plan Update Work commenced initially by examining the projected land use for the SOI, the population projections and build out scenarios through the end of the planning period, 2030. This work included interviews with City Staff, a review of the City’s General Plan, review of Sacramento Area Council of Governments (SACOG) data and US Census data. A summary of the population growth projections through 2030 is presented in Table ES-1.

Table ES-1: Yuba City Population Growth

Population 2000 2005 2010 2020 2030 Yuba City Incorporated Area (City Limits) 36,760(a) 51,000 61,000 85,000 118,000

Unincorporated Area (SOI) 20,270(a) 16,000(b) 19,000 26,000 37,000 Population 15,200 15,200 15,200 15,200 Projected SOI Sewered Area 800 3,800 11,800 22,800

Total Sewered Population (City Limits and SOI) 36,760 51,800 64,800 96,800 140,800

(a) U.S Census, 2000- Yuba City General Plan page 2-1 (b) Population decreased due to the annexation of developed area The wastewater treatment plant historical flows and loads were used to establish future flow and load projections. The historical flow and load data were also used to determine the per capita flow, biochemical oxygen demand (BOD) and suspended solids (SS) contributions. Future industrial flow contributions were estimated based on current industrial flow data. The key parameters used in the Master Plan Update are summarized in Table ES-2.

Table ES-2: Master Plan Update Assumptions

Parameter Units Value Flows Domestic gpcd 110

up to 2010 MGD 1.5 Sunsweet (existing industry) Increase during 2010 – 2030 MGD/year 0.02

up to 2010 MGD 0.5 Other Industries (combined) Increase during 2010 – 2030 %/year 3.4 Septage MGD 0.005 Septage increase between 2010 and 2030 % per year 2 Per capita contributions Per capita BOD lb pcd 0.2 Per capita TSS lb pcd 0.2

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Table ES-2: Master Plan Update Assumptions (cont’d)

Parameter Units Value Peaking factors Flow Peaking Factor (maximum day) 1.3 Flow Peaking Factor (maximum hour) 1.8 BOD overall load peaking factor 1.8 TSS overall load peaking factor 2.5

gpcd = gallons per capita per day MGD = million gallons per day lb pcd = pounds per capita per day

BOD = biochemical oxygen demand TSS = total suspended solids

Based on the above assumptions the projected flows and pollutant loads for the years 2010, 2020 and 2030 were developed and are summarized in Table ES-3.

Table ES-3: Projected Wastewater Flows and Characteristics

Parameter Units 2010 2020 2030 Population (Sewered) people 64,800 96,800 140,800 Flow Total Average Annual MGD 8.9 12.9 18.2 Maximum day MGD 11.6 16.7 23.6 Peak Hour MGD 16.1 23.1 32.7 BOD Total Average Annual lb/day 28,564 39,061 53,871 Total Average Annual mg/l 383 364 355 Maximum Day lb/day 51,415 70,310 96,968 TSS Total Average Annual lb/day 18,030 26,923 40,141 Total Average Annual mg/l 242 251 265 Maximum Day lb/day 45,075 67,308 100,354

MGD = million gallons per day lb/day = pounds per day BOD = biochemical oxygen demand

mg/l = milligrams per liter TSS = total suspended solids

These projected flows and loads were used as the basis for the development of the expansion projects.

Wastewater Treatment Facility Evaluation In early 2005, the City completed the upgrade and expansion of the wastewater treatment facility (WTF) to provide treatment for an average dry weather flow of 9 million gallons per day (MGD). These facilities currently convey and treat an average dry weather flow of about 6.5 MGD and a peak hourly flow of approximately 12 MGD.

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The existing treatment facilities were evaluated to establish the capacities of the unit process and to identify any operational and treatment limitations. The process capacity of the existing treatment facilities was established through a desktop evaluation of unit processes using standard design parameters. The following average operating data for the period of January 2001-August 2005 were used in the desktop review of the unit processes:

Table ES-4: Average Operating Data used in Desktop Unit Process Review

Average Operating Data Parameter Value Average day flow 6.0 MGD Peak day flow 8.2 MGD Peak hour flow 10.8 MGD Average influent BOD5 380 mg/l Peak influent BOD5 677mg/l Average influent TSS 221 mg/l Peak influent TSS 550 mg/l

The evaluation of the existing facilities was undertaken for the installed and firm capacity. The installed capacity is defined as the capacity with all unit treatment processes available at any time. The firm capacity is defined as the capacity with one unit treatment process unavailable at any time. The current condition of the unit processes for the liquid and the solids treatment streams, as well as the equipment redundancy and reliability were also reviewed. The WTF condition assessment included hydraulic, mechanical, and electrical operation of the facilities. This evaluation was based on visual field investigations, existing record drawings and comments provided by the WTF staff. Based on the identification of the existing capacities and future projected flows, the timing for the required expansion for each unit process was defined. Based on the City’s requirements the future projects were identified to provide firm capacity.

To establish the incremental increase of the capacity for each unit process, a modular expansion was assumed, i.e. each unit process would be expanded by addition of one tank (module) of similar capacity to the existing capacity.

In addition, rehabilitation and improvement projects were identified during the plant assessment and are recommended for a proper functioning of the existing facilities. A summary of the Capital Improvement Program (CIP) projects that were identified to accommodate the projected growth is included in Table ES-5, found at the end of the Executive Summary.

In summary, the City would need to spend $94,560,000 to provide additional capacity and necessary improvements over the next 20 years at the WTF. The estimated costs are in 2005 $ (dollars) and within the planning level (-30% to +50%) range of accuracy.

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Effluent Disposal Alternatives Currently, the City discharges the treated water to the Feather River year-round. The secondary effluent is disinfected with chlorine gas followed by dechlorination using sodium bisulfite. The CIP cost included in the Master Plan Update was developed assuming direct discharge to Feather River. It is possible that effluent discharge requirements may become more stringent in the future. To address more stringent effluent criteria, the costs were also estimated for other effluent discharge alternatives, as follows: 1. Discharge to Feather River meeting California Toxics Rule (CTR) requirements (without

nanofiltration) - $5,000,000.

2. Discharge to Feather River with filtration followed by UV - $35,000,000.

3. Discharge to Feather River with nanofiltration - $23,000,000.

4. 100% recycle with effluent storage and pumping - $41,200,000 for the chlorination/dechlorination option and $71,000,000 for the UV option.

5. Provision of nitrification, that includes upgrades to the membrane bioreactor (MBR) system and provision of the pure oxygen activated system (POAS) system - $6,000,000.

The estimated costs for alternative disposal scenarios would be in addition to the CIP costs summarized in Table ES-5. These probable cost estimates are in 2005 $ (dollars) and within the planning level (-30% to +50%) range of accuracy.

Sewer Collection System Yuba City is undergoing rapid development throughout its SOI. Currently, development is scheduled to commence in 2007 to 2010 throughout most of the SOI and will continue through 2020. As the sanitary sewer collection system is usually one of the first infrastructure services installed, this Master Plan Update establishes the estimated capital project costs for design and construction of three alternative collection system alignments.

Three alternative collection system alignments were developed for the Master Plan Update. These alignments were based on the City’s General Plan (adopted by the City in April 2004), the General Plan land use areas for the SOI and roadways as described in Section 5 of the General Plan. Figures ES-1, ES-2 and ES-3 show the major trunkline alignments for all three alternatives. In addition to these three alternatives an assessment of the existing sewer collection system capacity was also performed to determine how much additional development within the SOI could be supported.

To determine how much addition development could be supported by the existing collection system, a computer model was developed to determine wastewater flows along the collection system trunk located along Walton Avenue. This is the first sewer trunk that could be used to convey wastewater from new development in the SOI to the WTF. It was determined that this trunk has very little additional capacity to support future growth without the possibility of significant surcharging in the manholes along Walton Avenue during peak wet weather flows.

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Surcharged manholes would result in sewage rising up into the manhole and could result in a sanitary sewer overflow (SSO), a condition that would require City response resources and potentially subject the City to fines from the Central Valley Regional Water Quality Control Board. The existing collection system along Walton Road is essentially at capacity and cannot support additional development without significant and substantial modifications.

In order to support growth and development to the west of the City, within the sphere of influence, new collection system infrastructure should be installed in the time frames cited with each alternative.

Capital Improvement Program Project (CIPP) costs were based on standard construction 2005 costs for Northern California and are presented in 2005 dollars. It should be noted, however, that recent storms in the Gulf Coast (most notably reconstruction efforts following Hurricane Katrina) and global reconstruction efforts in South East Asia following the tsunami of December, 2004 have resulted in rapidly increasing construction raw material costs, and severely restricted availability of plastics such as PVC pipe and other collection system related support equipment such as pumps. These effects were taken into account by increasing the engineering contingency.

The City is considering the use of Title 22 recycled water in select areas for irrigation and other permitted uses. Project costs for each of the collection system alternatives were developed with and without recycled water piping being installed at the same time. Table ES-5 presents the capital improvement costs for the three collection system alternatives with and without the cost of recycled water piping.

Future Expansion of the Sewer Collection System within the SOI Three alternative sewer collection system expansion alternatives were considered. The first alternative was based on the current planned development timeline for Specific and Master Plans throughout the SOI as shown in Figure ES-1. Inspection of this figure shows that most of the plans commence permitted development in 2010 continuing through 2020, with two plans immediately west of Sanborn and Harding Road commencing in 2007. In order to support sewered development in these areas the Harding/Sanborn Trunk and Bogue Road Trunk to the WTF should be constructed by 2007. The remainder of the trunks should be constructed by 2010. This is a very rapid schedule for development of this size and if this approach is used, then design should commence immediately. The capital cost for Alternative 1 with and without recycled water piping is $87,950,000 and $79,561,000 respectively.

The second alternative considered phasing development in the SOI broadly into two areas. Phase 1 would allow sewered development to the northwest quadrant of the SOI bounded by Highway 20 and Butte House Road, and Phase 2 would allow development throughout the remainder of the SOI once Phase 1 development was essentially complete.

Wastewater from Phase 1 would be conveyed through a new trunk running along Harter, Harding and Sanborn Roads. Design and construction for this trunk should commence immediately if it is to serve this development sewered development. The capital cost for Alternative 2 - Phase 1 with and without recycled water piping is $68,770,000 and $59,570,000 respectively.

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Alternative 2 - Phase 2 construction in the remainder of the SOI should be phased-in commencing in 2015. The capital cost for Alternative 2 - Phase 2 with and without recycled water is $20,897,000 and $17,636,000 respectively.

This two phase development of the collection system is presented in Figure ES-2. The benefit to this approach is that it allows the City to phase development in the SOI and control capital improvement costs. The disadvantage of this approach is that sewered development throughout the SOI is limited.

The third alternative takes the same approach as Alternative 1, except that north-south main trunk alignments are modeled along the proposed Western and Harding Parkways. These parkways are described in Section 5 of the City’s General Plan and are shown on Figure ES-3. The capital cost for Alternative 3 with and without recycled water is $95,410,000 and $81,761,000 respectively.

Summary of Capital Improvement Program Project Costs The Capital Improvement Program Project Costs for the wastewater treatment and collection system are summarized in Table ES-5.

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Table ES-5: Summary of CIPP Costs for WWTP and Collection System

WASTEWATER TREATMENT SYSTEM CAPITAL IMPROVEMENT PROGRAM PROJECTS

Project Name Project No

Expansion Projects Rehabilitation Projects Design Start Year Online Cost (2005 $)

Aeration Basins 1,2 and 3 rehabilitation: Concrete repair Install mechanical equipment in basin 1 Re-route RAS piping

2006 2007 $6,000,000

Installation of noise reduction enclosures for the effluent pumps 2006 2007 $300,000

Replace the digesters floating covers with fixed steel or concrete covers 2006 2007 $1,600,000

Replace the waste gas burner 2006 2007 $110,000

Refurbish the original BFP Unit 2006 2007 $125,000

1 To be

completed by 2007

Improve No. 3 Water System: Loop #3 water system 2006 2007 $60,000

TOTAL PROJECT 1 $8,195,000

Grit Removal 2006 2008 $2,200,000

New Sludge Thickening building and two GBT units installation 2006 2008 $4,600,000

New Odor facility for the sludge thickening 2006 2008 $605,000

2 To be

completed by 2008

Install a new 30-inch outfall structure with 4-inch diffusers 2006 2008 $13,000,000

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Primary Sedimentation Tank No. 3 2007 2010 $2,300,000

Secondary Clarifier No. 4

Secondary sedimentation tanks improvements: Replace the launders in the existing

clarifiers

2007 2010 $6,000,000

Digester No. 3 2007 2010 $6,200,000

Install a separate septage handling system 2007 2010 $600,000

3 To be

completed by 2010

Install a new grease facility 2007 2010 $600,000


4 To be

completed by 2012

GBT No. 3 2010 2012 $1,100,000

TOTAL PROJECT 4 1,100,000

5 To be

completed by 2013

Chlorine Contact Tank Increase Sodium Bisulfite storage 2007 2010 $6,250,000


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Replace the 20-inch aeration basins influent piping with a 24-inch pipe.

2014 2016 $150,000

Screening Facility Improvements 2016 2018 $500,000

6 To be

completed by 2018

MBR Facility (6 MGD) 2017 2020 $35,000,000


7 To be

completed by 2020

Replace the 24-inch portion and the 30-inch portion in the secondary clarifier effluent piping with a 36-inch

2018 2020. $150,000

TOTAL PROJECT 7 $150,000

8 To be

completed by 2021

Digester No. 4 2017 2021 $4,100,000


9 To be

completed by 2023

Influent Pumping Station Improvements 2021 2023 $150,000

TOTAL PROJECT 9 $150,000

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10 To be

completed by 2027

BFP No. 3 2025 2027 $1,200,000


Electrical upgrades

Install a new switchgear Site lighting SCADA System Improvements

As required in association with facility expansion $1,660,000

TOTAL ALL WASTEWATER TREATMENT PROJECTS

NOTE: The CIP cost was developed assuming direct effluent discharge to Feather River.

$94,560,000

NA

Other Effluent Disposal Alternatives:

Alternative 1: Discharge to Feather River Meeting CTR Requirements (No Nanofiltration)

Alternative 2: Discharge to Feather River with Effluent Filtration Followed by UV

Alternative 3: Discharge to Feather River with Effluent Nanofiltration

Alternative 4: 100% Recycle with Effluent Storage Range of project costs

$5,000,000 - $71,000,000

RANGE OF COSTS FOR ALL WASTEWATER TREATMENT PROJECTS AND EFFLUENT DISPOSAL OPTIONS $99,560,000 - $165,560,000

NA

Nitrification If nitrogen removal is required in the future, the new aeration basins will be changed to accommodate nitrification. Also, the oxygen supply would need to be increased. Costs associated with this line item assume that project 6, MBR Facility (6 MGD), has been undertaken.

$7,000,000

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RANGE OF COSTS FOR ALL WASTEWATER TREATMENT PROJECTS, EFFLUENT DISPOSAL OPTIONS AND NITRIFICATION $106,560,000 - $172,560,000

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COLLECTION SYSTEM CAPITAL IMPROVEMENT PROGRAM PROJECTS

ALTERNATIVE Design Start Installed By Total Capital

(2005 dollars)(a)

Alternative 1 without recycled water distribution 2006 2010 $79,561,000

Alternative 1 with recycled water distribution piping 2006 2010 $87,950,000

TOTAL ALTERNATIVE 1 $79,561,000 - $87,950,000

Alternative 2 phase 1 without recycled water piping 2006 2010 $59,570,000 Alternative 2 phase 2 without recycled water piping 2012 2015 $17,636,000

TOTAL ALT ERNATIVE 2 without recycled water piping $77,206,000

Alternative 2 phase 1 with recycled water piping 2006 2010 $68,770,000

Alternative 2 phase 2 with recycled water piping 2006 2015 $20,897,000

TOTAL ALTERNATIVE 2 with recycled water piping $89,667,000

Alternative 3 without recycled water piping

2006 2010 $81,761,000

Alternative 3 with recycled water piping

2006 2010 $95,410,000

RANGE OF COSTS FOR ALL COLLECTION SYSTEM PROJECTS $77,206,000 - $95,410,000

GRAND TOTAL ALL PROJECTS $183,766,000 - $267,970,000

(a) These probable cost estimates are in 2005 dollars and are within -30% to +50% range of accuracy.

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