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City of Lincoln
Wastewater Facilities Master Plans

November 2007 Update
Adopted 3-17-08


Wastewater Facilities
Master Plan Update
November 2007
Adopted 3-17-08

All documents in Acrobat (PDF) format Acrobat Document

Cover Page  (154 K)
Table of Contents  (298 K)
Chapter 1 - Executive Summary  (6.56 M)
1.1 BACKGROUND
1.2 PLANNING GOALS AND OBJECTIVES
1.3 STUDY AREA BOUNDARIES
1.4 POPULATION PROJECTIONS
1.5 COLLECTION SYSTEM MODELING
1.6 COLLECTION SYSTEM IMPROVEMENTS
1.7 THERESA STREET WWTF IMPROVEMENTS
  • 1.7.1 Projected Flows
  • 1.7.2 Summary of Theresa Street WWTF Tier I and II Improvements
  • 1.7.3 Summary of Theresa Street WWTF Tier III Improvements
1.8 NE WWTF IMPROVEMENTS
  • 1.8.1 Summary of NE WWTF Tier I, II, and III Improvements
1.9 EMERGING WWTF TECHNOLOGIES AND OTHER CONSIDERATION
1.10 ADDITIONAL RECOMMENDATIONS
  • 1.10.1 Collection System Operation and Maintenance
  • 1.10.2 Peak Flow Reduction
  • 1.10.3 Collection System Flow Monitoring Program
  • 1.10.4 Hydraulic Modeling
  • 1.10.5 Industrial Pre-Treatment Program
  • 1.10.6 Wastewater Lift Stations
1.11 CIP - PLANNING LEVEL COSTS
  • 1.11.1 Collection System
  • 1.11.2 Wastewater Treatment Facilities
  • 1.11.3 Combined Total Costs
Chapter 2 - Introduction  (119 K)
2.1 BACKGROUND
  • 2.1.1 History
  • 2.1.2 Reason for Updating the Wastewater Facilities Master Plan
  • 2.1.3 2030 Comprehensive Plan
2.2 FACTORS THAT AFFECT FACILITIES PLANNING
  • 2.2.1 Population Increases
  • 2.2.2 Regulatory Changes
  • 2.2.3 Condition and Age of Facilities
2.3 PLANNING GOALS AND OBJECTIVES
2.4 IDENTIFIED IMPROVEMENTS
2.5 RELATED STUDIES, REPORTS, AND DOCUMENTS
2.6 GENERAL TERMINOLOGY
  • 2.6.1 Facilities
  • 2.6.2 Wastewater Flow
  • 2.6.3 Wastewater Constituents
2.7 WASTEWATER AND SOLID WASTE ORGANIZATION
2.8 ACKNOWLEDGMENTS
Chapter 3 - Planning Considerations  (3.91 M)
3.1 GENERAL
3.2 STUDY LIMITS
  • 3.2.1 Geographical Boundaries
  • 3.2.2 Wastewater Drainage Basins
  • 3.2.3 Planning Areas
  • 3.2.4 100 Year Floodplain Areas
3.3 PLANNING AGENCIES
3.4 EXISTING LAND USAGE
3.5 FUTURE LAND USE
3.6 POPULATION
  • 3.6.1 Historical Population
  • 3.6.2 Projected Population
  • 3.6.3 Comparison of Land Inventory to Projected Population
Chapter 4 - Existing Collection System  (566 K)
4.1 BACKGROUND
  • 4.1.1 Existing Collection System
  • 4.1.2 Collection System Operation and Maintenance
4.2 WASTEWATER COLLECTION SYSTEM BASINS TRIBUTARY TO THE THERESA STREET WWTF
  • 4.2.1 Salt Valley (Salt Creek)
  • 4.2.2 Antelope Creek
  • 4.2.3 West 'O' Street
  • 4.2.4 Middle Creek
  • 4.2.5 Haines Branch
  • 4.2.6 Beal Slough
  • 4.2.7 Oak Creek
  • 4.2.8 Lynn Creek
  • 4.2.9 Little Salt Creek
  • 4.2.10 East Campus
4.3 WASTEWATER COLLECTION SYSTEM BASINS TRIBUTARY TO THE NORTHEAST WWTF
  • 4.3.1 Deadmans Run
  • 4.3.2 Havelock
  • 4.3.3 Stevens Creek
4.4 WASTEWATER LIFT STATIONS
  • 4.4.1 General Summary
  • 4.4.2 Wastewater Lift Station Telemetry
  • 4.4.3 Lift Station Operation and Maintenance
Chapter 5 - Existing Wastewater Treatment Facilities  (2.36 M)
5.1 THERESA STREET WWTF
  • 5.1.1 Overview
  • 5.1.2 Liquid Treatment
  • 5.1.3 Biosolids Treatment
  • 5.1.4 Odor Control
  • 5.1.5 Recently Completed Improvements
  • 5.1.6 Historical Influent Flows
  • 5.1.7 Historical Influent Quality
  • 5.1.8 Treatment Facility Performance
  • 5.1.9 Discharge Permit
  • 5.1.10 Future Capacity
5.2 NORTHEAST WWTF
  • 5.2.1 Overview
  • 5.2.2 Liquid Treatment
  • 5.2.3 Odor Control
  • 5.2.4 Biosolids Treatment
  • 5.2.5 Recently Completed Improvements
  • 5.2.6 Historical Influent Flows
  • 5.2.7 Historical Influent Quality
  • 5.2.8 Treatment Facility Performance
  • 5.2.9 Discharge Permit
  • 5.2.10 Future Capacity
5.3 COMPARISON OF WATER USAGE TO WASTEWATER FLOW
5.4 HISTORICAL PER CAPITA WASTEWATER FLOW
5.5 INDUSTRIAL CONTRIBUTIONS
Chapter 6 - Regulatory Requirements  (54 K)
6.1 CURRENT REGULATORY REQUIREMENTS
  • 6.1.1 Surface Water Quality Standards
  • 6.1.2 Effluent Discharge Permitting System
  • 6.1.3 Residuals Disposal Regulations
  • 6.1.4 Air Permits
  • 6.1.5 Stormwater Permits
6.2 EVOLVING REGULATIONS
  • 6.2.1 Effluent Limits
  • 6.2.2 Biosolids Use and Disposal Regulations
Chapter 7 - Basis for Alternative Evaluations  (26 K)
7.1 GENERAL
7.2 ECONOMIC EVALUATION
  • 7.2.1 Probable Opinion of Estimated Costs
  • 7.2.2 Future Costs
  • 7.2.3 Assigning Costs
  • 7.2.4 Contingencies
  • 7.2.5 Collection System Costs
  • 7.2.6 Wastewater Treatment Facility Costs
  • 7.2.7 Summary or Recommendation
  • Chapter 8 - Development of the Collection System Hydraulic Model  (76 K)
    8.1 INTRODUCTION
    8.2 DYNAMIC HYDRAULIC MODEL DEVELOPMENT
    • 8.2.1 Data Collection
    • 8.2.2 Establishment of Network Connectivity
    8.3 HYDRAULIC MODEL FLOW INPUTS
    • 8.3.1 Manning's Equation
    • 8.3.2 Peak Flow Equation
    • 8.3.3 Comparison of Peak Flow Equations
    • 8.3.4 Flow Inputs
    • 8.3.5 Development of Peak Flow Diurnal Curve
    8.4 MODEL CALIBRATION
    • 8.4.1 Wet Weather Flow Calibration
    Chapter 9 - Collection System Modeling Evaluation Criteria  (26 K)
    9.1 INTRODUCTION
    9.2 DESIGN CRITERIA AND CONSTRAINTS
    • 9.2.1 Existing and Future System Evaluation Criteria
    • 9.2.2 Recommended Improvements Criteria
    9.3 MODEL SCENARIOS
    Chapter 10 - Salt Creek Basin  (1.03 M)
    10.1 SALT VALLEY TRUNK SEWER SYSTEM
    10.2 EXISTING CONDITIONS
    • 10.2.1 Model Results
    • 10.2.2 Improvements
    10.3 TIER I CONDITIONS
    • 10.3.1 Modeling Results
    • 10.3.2 Identification of Alternatives
    10.4 TIER II CONDITIONS
    • 10.4.1 Modeling Results
    • 10.4.2 Improvements/Recommendations
    10.5 TIER III CONDITIONS
    • 10.5.1 Model Results
    • 10.5.2 Improvements
    10.6 SUMMARY OF RECOMMENDED IMPROVEMENTS
    Chapter 11 - Antelope Creek Basin  (721 K)
    11.1 ANTELOPE CREEK TRUNK SEWER SYSTEM
    11.2 EXISTING CONDITIONS
    • 11.2.1 Model Results
    • 11.2.2 Improvement Alternatives
    11.3 TIER I CONDITIONS
    • 11.3.1 Model Results
    • 11.3.2 Identified Alternatives
    11.4 SUMMARY OF RECOMMENDED IMPROVEMENTS
    Chapter 12 - Beal Slough Basin  (483 K)
    12.1 BEAL SLOUGH TRUNK SEWER SYSTEM
    12.2 EXISTING CONDITIONS
    • 12.2.1 Model Results
    • 12.2.2 Improvements
    12.3 TIER I CONDITIONS
    • 12.3.1 Model Results
    • 12.3.2 Alternative Identification
    12.4 SUMMARY OF RECOMMENDED IMPROVEMENTS
    Chapter 13 - Upper Southeast Salt Creek Basin  (371 K)
    13.1 UPPER SOUTHEAST TRUNK SEWER SYSTEM
    13.2 MODELING RESULTS
    • 13.2.1 Tier I Conditions
    • 13.2.2 Tier II Conditions
    13.3 IMPROVEMENTS
    • 13.3.1 Tier I Improvements
    • 13.3.2 Tier II Improvements
    13.4 SUMMARY OF RECOMMENDED IMPROVEMENTS
    Related Links: Upper Southeast Salt Creek Alignment Study
    Chapter 14 - Upper Southwest Salt Creek Basin  (517 K)
    14.1 UPPER SOUTHWEST TRUNK SEWER SYSTEM
    14.2 MODELING RESULTS
    • 14.2.1 Tier I Conditions
    • 14.2.2 Tier II Conditions
    • 14.2.3 Tier III Conditions
    14.3 IMPROVEMENTS
    • 14.3.1 Tier I Improvements
    • 14.3.2 Tier II Improvements
    • 14.3.3 Tier III Improvements
    14.4 SUMMARY OF RECOMMENDED IMPROVEMENTS
    Chapter 15 - Haines Branch Basin  (389 K)
    15.1 HAINES BRANCH TRUNK SEWER SYSTEM
    15.2 MODELING RESULTS
    • 15.2.1 Existing Conditions
    • 15.2.2 Tier I Conditions
    • 15.2.3 Tier II Conditions
    • 15.2.4 Tier III Conditions
    15.3 IMPROVEMENTS
    • 15.3.1 Tier I Improvements
    • 15.3.2 Tier II Improvements
    • 15.3.3 Tier III Improvements
    15.4 SUMMARY OF RECOMMENDED IMPROVEMENTS
    Chapter 16 - Middle Creek and West 'O' Street Basins  (1.11 M)
    16.1 MIDDLE CREEK AND WEST 'O' STREET TRUNK SEWER SYSTEMS
    16.2 MODELING RESULTS
    • 16.2.1 Existing Conditions
    • 16.2.2 Tier I Conditions
    • 16.2.3 Tier II Conditions
    • 16.2.4 Tier III Conditions
    16.3 IMPROVEMENTS
    • 16.3.1 Existing Conditions
    • 16.3.2 Tier I Improvements
    • 16.3.3 Tier II Improvements
    • 16.3.4 Tier III Improvements
    16.4 SUMMARY OF RECOMMENDED IMPROVEMENTS
    Chapter 17 - Oak Creek and Lynn Creek Basins  (1.57 M)
    17.1 TRUNK SEWER SYSTEM
    17.2 MODELING RESULTS
    • 17.2.1 Existing Conditions
    • 17.2.2 TIER I CONDITIONS
    • 17.2.3 Tier II Conditions
    • 17.2.4 Tier III Conditions
    17.3 IMPROVEMENTS
    • 17.3.1 Existing Improvements
    • 17.3.2 Tier I Improvements
    • 17.3.3 Tier II Improvements
    • 17.3.4 Tier III Improvements
    17.4 SUMMARY OF RECOMMENDED IMPROVEMENTS
    Related Links: Oak Creek Basin Trunk Sewer and Sub-Basin Sewers Preliminary Design Report
    Chapter 18 - Little Salt Creek Basin  (1.19 M)
    18.1 LITTLE SALT CREEK TRUNK SEWER SYSTEM
    18.2 MODELING RESULTS
    • 18.2.1 Existing Conditions
    • 18.2.2 Tier I Conditions
    • 18.2.3 Tier II Conditions
    • 18.2.4 Tier III Conditions
    18.3 IMPROVEMENTS
    • 18.3.1 Existing Conditions
    • 18.3.2 Tier I Improvements
    • 18.3.3 Tier II Improvements
    • 18.3.4 Tier III Improvements
    18.4 SUMMARY OF RECOMMENDED IMPROVEMENTS
    Chapter 19 - Deadmans Run, East Campus, and Havelock Basins  (863 K)
    19.1 TRUNK SEWER SYSTEMS
    19.2 MODELING RESULTS
  • 19.2.1 Existing Conditions
  • 19.2.2 Tier I Conditions
  • 19.3 IMPROVEMENTS
  • 19.3.1 Existing Conditions
  • 19.3.2 Tier I Conditions
  • 19.4 SUMMARY OF RECOMMENDED IMPROVEMENTS
  • 19.4.1 Sewer Monitoring
  • 19.4.2 84th Street Sewer
  • Chapter 20 - Northeast Salt Creek Basin  (1 M)
    20.1 NORTHEAST SALT CREEK TRUNK SEWER SYSTEM
  • 20.1.1 Modeling Results
  • 20.1.2 Existing Conditions
  • 20.1.3 Tier I Conditions
  • 20.1.4 Tier II and III Conditions
  • 20.2 IMPROVEMENTS
    • 20.2.1 Tier 1
    • 20.2.2 Tier II
    • 20.2.3 Tier III
    20.3 SUMMARY OF RECOMMENDED IMPROVEMENTS
    Related Links: Northeast Salt Creek Collection System Study
    Chapter 21 - Stevens Creek Basin  (1.21 M)
    21.1 STEVENS CREEK TRUNK SEWER SYSTEM
    21.2 MODELING RESULTS
    • 21.2.1 Existing Conditions
    • 21.2.2 Tier I Conditions
    • 21.2.3 Tier II Conditions
    • 21.2.4 Tier III Conditions
    21.3 IMPROVEMENTS
    • 21.3.1 Tier I Improvements
    • 21.3.2 Tier II Improvements
    • 21.3.3 Tier III Improvements
    21.4 SUMMARY OF RECOMMENDED IMPROVEMENTS
    Related Links: Stevens Creek Trunk Sewer Preliminary Design Report
    Chapter 22 - Southeast Basin  (554 K)
    22.1 SOUTHEAST DRAINAGE BASIN
    22.2 MODELING RESULTS
    • 22.2.1 Existing, Tier I and Tier II Conditions
    • 22.2.2 Tier III
    22.3 TIER III IMPROVEMENTS
    Chapter 23 - Collection System Summary  (3 M)
    23.1 SUMMARY OF IMPROVEMENTS
    23.2 LIFT STATION IMPROVEMENTS
    • 23.2.1 Summary
    • 23.2.2 Recommended Improvements to Existing Lift Stations
    • 23.2.3 Anticipated New Lift Stations
    23.3 SUMMARY OF COLLECTION SYSTEM MODELING
    • 23.3.1 Theresa Street WWTF Drainage Areas
    • 23.3.2 NE WWTF Drainage Areas
    Chapter 24 - Wastewater Treatment Facilities Future Improvements  (7.21 M)
    24.1 INTRODUCTION
    24.2 THERESA STREET WWTF - FUTURE IMPROVEMENTS
    • 24.2.1 Current Through Tier II Improvements
    • 24.2.2 Recent and Current Improvements
    • 24.2.3 Tier I Improvements - Current and Recommended
    • 24.2.4 Tier II Improvements
    • 24.2.5 Tier III Improvements
    • 24.2.6 Summary of Tier III Improvements
    • 24.2.7 Summary of Theresa Street WWTF Improvements
    24.3 NORTHEAST STREET WWTF
    • 24.3.1 Overview
    • 24.3.2 Tier I Improvements
    • 24.3.3 Tier II Improvements
    • 24.3.4 Tier III Improvements
    • 24.3.5 Summary of NE WWTF Improvements
    24.4 EMERGING WASTEWATER TREATMENT TECHNOLOGIES AND OTHER CONSIDERATIONS
    24.5 SUMMARY OF IDENTIFIED WWTF IMPROVEMENTS
    Chapter 25 - Additional Recommendations  (459 K)
    25.1 GENERAL
    25.2 COLLECTION SYSTEM OPERATION AND MAINTENANCE
    25.3 PEAK FLOW REDUCTION
    25.4 COLLECTION SYSTEM FLOW MONITORING PROGRAM
    • 25.4.1 Components of Wastewater Flows
    • 25.4.2 Need for Flow Monitoring Program
    25.5 INDUSTRIAL PRE-TREATMENT PROGRAM
    Chapter 26 - Summary of Planning Costs and Phasing  (71 K)
    26.1 GENERAL
    26.2 SUMMARY OF ESTIMATED IMPROVEMENT COSTS
    • 26.2.1 Collection System
    • 26.2.2 Wastewater Treatment Facilities
    26.3 OVERVIEW
    Appendices
    Appendix A History of Wastewater Collection and Treatment in Lincoln  (364 K)
    Appendix B Abbreviations  (25 K)
    Appendix C Wastewater Lift Stations  (713 K)
    Appendix D Hydraulic Model Results  (868 K)
    Appendix E WWTF Process and Equipment Identification  (439 K)
    Appendix F Theresa Street and Northeast WWTF's Discharge Permits  (4.31 M)
    Appendix G Industrial Audit (FY 2005/2006)  (1.64 M)
    Appendix H Air Permit for Theresa Street WWTF  (3.49 M)
    Appendix I Stormwater Permits for Both WWTF's  (169 K)
    Appendix J Biosolids Agreement and 2006 Reports  (1.19 M)
    Appendix K NE WWTF Biosolids Land Application Yearly Summaries (1996-2006)  (601 K)
    Appendix L Theresa Street WWTF Odor Abatement Study  (904 K)
    Appendix M Theresa Street WWTF Hydraulic Profile Calculations  (2.52 M)
    Appendix N Southwest Wastewater Facility Siting Study Report -Removed based on City Council and County Board actions.
    List of Tables
    Table 1.1 Population Projections from 2005 to 2060 (1)
    Table 1.2 Modeled Theresa Street WWTF Drainage Areas (1,2)
    Table 1.3 Modeled NE WWTF Drainage Areas (1,2)
    Table 1.4 Summary of Collection System Pipeline Improvements (1)
    Table 1.5 Summary of Collection System Storage Improvements (1)
    Table 1.6 Summary of Tier III Planning Level Costs
    Table 1.7 Summary of Collection System Improvement Costs (1)
    Table 1.8 Summary of Wastewater Treatment Facility Improvement Costs (1,2)
    Table 1.9 Total of Collection and WWTF Improvements Costs (1,2)
    Table 3.1 Historical Population From 1880 to 1980 (1)
    Table 3.2 Population Projections from 2005 to 2060 (1)
    Table 3.3 Acreage Calculations Based on Population
    Table 4.1 Historical Length of Sanitary Sewer Pipe Installed
    Table 4.2 Increase in Existing Wastewater Drainage Basin Areas
    Table 4.3 Existing Collection System Operations and Maintenance Requirements
    Table 4.4 Summary of Wastewater Lift Stations
    Table 5.1 Rated Capacity of the Theresa Street WWTF
    Table 5.2 Theresa Street WWTF Secondary Treatment Summary
    Table 5.3 Theresa Street WWTF Annual Biosolids Land Application Volumes
    Table 5.4 Theresa Street WWTF Historical Influent Flows
    Table 5.5 Theresa Street WWTF Average Influent Loading Concentrations
    Table 5.6 Theresa Street WWTF Average Influent Mass Loading
    Table 5.7 Theresa Street WWTF Average Effluent Concentrations
    Table 5.8 Theresa Street WWTF Average Influent Removal (1)
    Table 5.9 Theresa Street WWTF Effluent Fecal Coliform Concentrations (1)
    Table 5.10 Rated Capacity of the Northeast WWTF
    Table 5.11 Northeast WWTF Secondary Treatment Summary
    Table 5.12 Northeast WWTF Annual Average Flows
    Table 5.13 Northeast WWTF Average Influent Loading Concentrations
    Table 5.14 Northeast WWTF Average Influent Mass Loading
    Table 5.15 Northeast WWTF Average Effluent Concentrations
    Table 5.16 Northeast WWTF Average Influent Removal (1)
    Table 5.17 Northeast WWTF Effluent Fecal Coliform Concentrations (1)
    Table 5.18 Comparison of Water Usage and Wastewater Treatment Facility Flows
    Table 5.20 Industrial Flow and Loading Contributions
    Table 6.1 Salt Creek Segment LP2-20000 Stream Classification
    Table 6.2 Theresa Street WWTF NPDES Permit Monitoring Requirements
    Table 6.3 Theresa Street WWTF Effluent NPDES Permit Limitations
    Table 6.4 Northeast WWTF Effluent NPDES Permit Limitations
    Table 6.5 Theresa Street WWTF - Air Permit Requirements (1)
    Table 7.1 Collection System Planning Costs
    Table 7.2 Wastewater Treatment Facility Planning Costs
    Table 8.1 Key Hydraulic Model Data
    Table 8.2 Collection System Lift Stations included in the Hydraulic Model
    Table 8.3 Peak Wastewater Design Flow Equation Comparison
    Table 8.3 Wet Weather Calibration Results
    Table 9.1 Existing System Model Scenarios
    Table 10.1 Salt Valley Trunk Sewer System Existing and Future Tributary Areas
    Table 10.2 Surcharged Pipes Salt Valley System - Tier I Conditions
    Table 10.3 Results of Flow Maximization of Existing System
    Table 10.4 Simulation Results of Storage with Flow Maximization
    Table 10.5 Comparison of d/D Ratios for various I/I Flow Reduction Target Levels
    Table 10.6 Manholes with Modeled SSO's Under Tier II Conditions
    Table 10.7A Surcharged Pipes Salt Valley System - Tier II Conditions
    Table 10.7B Surcharged Pipes Salt Valley System - Tier II Conditions
    Table 10.7C Surcharged Pipes Salt Valley System - Tier II Conditions
    Table 10.8 Recommended Improvements - Salt Valley Trunk Sewer System
    Table 11.1 Antelope Creek Trunk Sewer System Modeling Areas (ac) (1,2)
    Table 11.2 Surcharged Pipes - Existing Conditions - Antelope Creek Trunk Sewer
    Table 11.3 Surcharged Pipes - Tier I Conditions - Antelope Creek Trunk Sewer
    Table 11.4 Recommended Improvements - Antelope Creek Trunk Sewer
    Table 12.1 Beal Slough Trunk Sewer Tributary Areas (ac) (1,2)
    Table 12.2 Surcharged Pipes - Tier I Conditions
    Table 12.3 Recommended Improvements - Beal Slough Trunk Sewer System
    Table 13.1 Service Area and Flows - Upper Southeast Basin (1,2)
    Table 13.2 Upper Southeast Basin Tier I Modeling Results
    Table 13.3 Design Characteristics of Proposed Sewers - Upper SE Basin
    Table 13.4 Modeling Results of Proposed Sewers - Upper Southeast Basin
    Table 13.5 Recommended Improvements - Upper Southeast Basin
    Table 14.1 Service Areas and Flows - Upper Southwest Basin
    Table 14.2 Design Characteristics of Proposed Sewers - Upper SW Basin
    Table 14.3 Modeling Results of Proposed Sewers - Upper Southwest Basin
    Table 14.7 Recommended Improvements - Upper Southwest Salt Valley Basin
    Table 14.7 Recommended Improvements - Upper Southwest Salt Valley Basin
    Table 15.1 Service Areas and Flows - Haines Branch Basin (1,2)
    Table 15.2 Design Characteristics of Proposed Sewers - Haines Branch Basin
    Table 15.3 Modeling Results of Proposed Sewers - Haines Branch Basin
    Table 15.4 Recommended Improvements - Haines Branch Basin
    Table 15.4 Recommended Improvements - Haines Branch Basin
    Table 16.1 Service Areas and Flows - West O St & Middle Creek Basins
    Table 16.2 Manholes with Modeled SSO's - Tier I Conditions - West 'O' St and Middle Creek Basins
    Table 16.3 Design Characteristics of Proposed Sewers - Middle Creek Basin
    Table 16.4 Design Characteristics of Proposed Sewers - West O St Basin
    Table 16.5 Modeling Results of Proposed Sewers - Middle Creek Basin
    Table 16.6 Modeling Results of Proposed Sewers - West O St Basin
    Table 16.7 Recommended Improvements - West 'O' Street and Middle Creek Basins
    Table 16.7 Recommended Improvements - West 'O' Street and Middle Creek Basins
    Table 16.7 Recommended Improvements - West 'O' Street and Middle Creek Basins
    Table 17.1 Service Areas and Flows - Oak Creek and Lynn Creek Basins
    Table 17.2 Oak Creek Manholes with Modeled SSO's - Existing Conditions
    Table 17.3 Surcharged Pipes - Oak Creek Basin - Existing Conditions
    Table 17.4 Surcharged Pipes - Lynn Creek Basin - Existing Conditions
    Table 17.5 Design Characteristics of Proposed Sewers - Oak Creek Basin
    Table 17.6 Modeling Results of Proposed Sewers - Oak Creek Basin
    Table 17.7 Recommended Improvements - Oak Creek and Lynn Creek Basins
    Table 17.7 Recommended Improvements - Oak and Lynn Creek Basins
    Table 17.7 Recommended Improvements - Oak and Lynn Creek Basins
    Table 18.1 Service Areas and Flows - Little Salt Creek Basin (1,2)
    Table 18.2 Design Characteristics of Proposed Sewers - Little Salt Basin
    Table 18.3 Modeling Results of Proposed Sewers - Little Salt Basin
    Table 18.4 Recommended Improvements Little Salt Creek Basin
    Table 19.1 Service Area and Flows - Deadmans Run, East Campus, & Havelock Basins (1,2)
    Table 19.2 Surcharged Pipes - Existing Conditions- Deadmans Run Basin
    Table 19.3 Comparison of d/D Ratios for I/I Flow Reduction Target Levels - Deadmans Run Basin
    Table 20.1 Service Areas and Flows - Northeast Salt Creek Basin (1,2)
    Table 20.2 Un-Developable Areas in Northeast Salt Creek Basin
    Table 20.3 Northeast Salt Creek Tier I Phased Basin Development Plan
    Table 20.5 Design Characteristics of Proposed Sewers - Northeast Salt Creek Basin
    Table 20.6 Modeling Results of Proposed Sewers - Northeast Salt Creek Basin
    Table 20.7 Recommended Improvements Northeast Salt Creek Basin
    Table 20.7 Recommended Improvements Northeast Salt Creek Basin
    Table 21.1 Service Areas and Flows - Stevens Creek Basin (1,2)
    Table 21.2 Design Characteristics of Proposed Sewers - Stevens Creek Basin
    Table 21.3 Modeling Results of Proposed Sewers - Stevens Creek Basin
    Table 21.4 Recommended Improvements Stevens Creek Basin
    Table 22.1 Service Areas and Flows - Southeast Basin (1,2)
    Table 22.2 Design Characteristics of Proposed Sewers - Southeast Basin
    Table 22.3 Modeling Results of Proposed Sewers - Southeast Basin
    Table 22.4 Recommended Improvements Southeast Basin
    Table 23.1 Summary of Collection System Pipeline Improvements (1)
    Table 23.2 Summary of Collection System Storage Improvements (1)
    Table 23.3 Modeled Theresa Street WWTF Drainage Areas (1,2)
    Table 23.4 Modeled NE WWTF Drainage Areas (1,2)
    Table 24.1 Modeled Tier III Theresa Street and SW WWTF Drainage Areas (1,2)
    Table 24.2 New SW WWTF - Tier III Alternative 1
    Table 24.3 New West Side Salt Creek Trunk Sewer - Tier III Alternative 2
    Table 24.4 Parallel East Side Salt Creek Trunk Sewer - Tier III Alternative 3
    Table 24.5 Increased Storage - Tier III Alternative 4
    Table 24.6 Summary of Tier III Planning Level Costs
    Table 24.7 Recommended Improvements Theresa Street Wastewater Treatment Facility
    Table 24.8 Recommended Improvements Northeast Wastewater Treatment Facility
    Table 25.1 Collection System Projected Cleaning and Videoing Crew Needs
    Table 26.1 Summary of Collection System Improvement Costs (1)
    Table 26.2 Summary of Wastewater Treatment Facility Improvement Costs (1,2)
    Table 26.3 Comparison of City CIP and Master Plan Update Costs for Tier I Period (1,2)
    List of Figures
    Figure 1.1 - Study Area Boundaries
    Figure 1.2 - Modeled Peak Collection System Flows at Theresa Street WWTF
    Figure 1.3 Modeled Peak Collection System Flows at NE WWTF
    Figure 1.4 Planning Area Tier I Improvements
    Figure 1.5 Planning Area Tier II Improvements
    Figure 1.6 Planning Area tier III Improvements
    Figure 1.7 Planning Area Storage Improvements
    Figure 1.8 Schematic Drawing of Storage Facilities
    Figure 1.9 General Layout of Storage Facilities
    Figure 1.10 Theresa Street WWTF Projected MMAD Flows
    Figure 1.11 Theresa Street WWTF Aerial Photo with Tier I and II Future Improvements
    Figure 1.12 Northeast WWTF Projected MMAD Flows
    Figure 1.13 Northeast WWTF Future Improvements
    Figure 1.14 General Layout of WWTF Site
    Figure 1.15 Annual Cost of Collection System Improvements
    Figure 1.16 Annual Cost of Theresa Street and Northeast WWTF Improvements
    Figure 1.17 Summary of Annual Cost of Improvements
    Figure 2.1 City of Lincoln Wastewater and Solid Waste System Organization Chart
    Figure 3.1 Project Study Area
    Figure 3.2 Drainage Basins
    Figure 3.3 Utility Planning Zones
    Figure 3.4 Planning Growth Tiers
    Figure 3.5 100 Year Floodplain
    Figure 3.6 Historical and Projected Population Trends for City of Lincoln and Lancaster County
    Figure 3.7 Comparison of Historic and Projected Population to Projected Tier Growth
    Figure 4.1 Existing Wastewater Trunk Sewer System
    Figure 4.2 Historical Collection System Stoppages
    Figure 5.1 Theresa Street WWTF Liquid Process Schematic
    Figure 5.2A Theresa Street WWTF Hydraulic Profile - Central Train
    Figure 5.2B Theresa Street WWTF Hydraulic Profile - East and West Train
    Figure 5.3 Theresa Street WWTF Solids Process Schematic
    Figure 5.4 Theresa Street WWTF Aerial Photo (April 2005)
    Figure 5.5 Theresa Street WWTF Aerial Photo (Oct. 12, 2006)
    Figure 5.6 Treatment Facilities SCADA System Diagram
    Figure 5.7 Theresa Street WWTF Historical Influent Flows
    Figure 5.8 Theresa Street WWTF Influent Flow Comparison
    Figure 5.9 Theresa Street WWTF Influent Loading Concentrations
    Figure 5.10 Theresa Street WWTF Influent Mass Loading
    Figure 5.11 Theresa Street WWTF Effluent Concentrations
    Figure 5.12 Northeast WWTF Liquid Process Schematic
    Figure 5.13 Northeast WWTF Hydraulic Profile
    Figure 5.14 Northeast WWTF Biosolids Injection Sites
    Figure 5.15 Northeast WWTF Solids Process Schematic
    Figure 5.16 Northeast WWTF Aerial Photo (April 2005)
    Figure 5.17 Northeast WWTF Aerial Photo (Oct. 12, 2006)
    Figure 5.18 Northeast WWTF Historical Influent Flows
    Figure 5.19 Northeast WWTF Influent Flow Comparison
    Figure 5.20 Northeast WWTF Influent Loading Concentrations
    Figure 5.21 Northeast WWTF Influent Mass Loading
    Figure 5.22 Northeast WWTF Effluent Concentrations
    Figure 5.23 Historical Per Capita Wastewater Flow
    Figure 8.1 Peak Flow Curve Based on Flow Equation
    Figure 8.2 Peak Wastewater Design Flow Equation Comparison
    Figure 8.3 Theresa Street WWTF Ratio of Instantaneous Flow and Peak Wet Weather Flow
    Figure 8.4 Beal Slough Ratio of Instantaneous Flow and Peak Wet Weather Flow
    Figure 10.1 Salt Valley Basin Trunk Sewer System
    Figure 10.2 Locations of Pipes with Velocities <= 2.0 ft/sec - Existing Conditions
    Figure 10.3 Location of Surcharged Pipes - Tier I Conditions
    Figure 10.4 Hydraulic Profile of Surcharged Pipes - Tier I Conditions
    Figure 10.5 Modeled Water Surface Levels With and Without Flow Maximization - Tier I Conditions
    Figure 10.6 Location of Modeled Storage - Tier I Conditions
    Figure 10.7 Comparison of Water Surface Elevations - Tier I Conditions
    Figure 10.8 Comparison of Water Surface Elevation for Various I/I Flow Reduction Target Levels - Tier I Conditions
    Figure 10.9 Locations of Surcharged Pipes - Tier II Conditions
    Figure 10.10 Hydraulic Profile of Surcharged Pipes - Tier II Conditions
    Figure 10.11 Comparison of Water Surface Elevations for Various I/I Flow Reduction Target Levels - Tier II Conditions
    Figure 10.12 Location of Storage with 20% I/I Flow Reduction - Tier II Conditions
    Figure 10.13 Hydraulic Profile - Tier II Conditions with Storage Improvements
    Figure 11.1 Antelope Basin Trunk Sewer System
    Figure 11.2 Location of Surcharged Pipes - Antelope Creek Trunk Sewer - Existing Conditions
    Figure 11.3 Hydraulic Profile of Surcharged Pipes - Antelope Creek Trunk Sewer - Existing Conditions
    Figure 11.4 Locations of Pipes with Velocities <=2.0 ft/sec - Antelope Creek Trunk Sewer - Existing Conditions
    Figure 11.5 Location of Surcharged Pipes - Antelope Creek Trunk Sewer - Tier I Conditions
    Figure 11.6 Hydraulic Profile of Surcharged Pipes - Antelope Creek Trunk Sewer - Tier I Conditions
    Figure 12.1 Beal Slough Trunk Sewer System
    Figure 12.2 Location of Pipes with Velocities <=2.0 ft/sec - Existing Conditions
    Figure 12.3 Location of Surcharged Pipes - Tier I Conditions
    Figure 13.1 Upper Southeast Salt Creek Basin Map
    Figure 13.2 Proposed Tier I and II Sewer Improvements - Upper Southeast Basin
    Figure 14.1 Upper Southwest Basin Map
    Figure 14.2 Proposed Sewer Improvements - Upper Southwest Basin
    Figure 15.1 Haines Branch Basin Map
    Figure 15.2 Proposed Sewer Improvements - Haines Branch Trunk Sewer System
    Figure 16.1 Middle Creek and West 'O' Street Trunk Sewer System
    Figure 16.2 Location of Surcharged Pipes - Existing Conditions
    Figure 16.3 Proposed Sewer Improvements - West 'O' St and Middle Creek Basins
    Figure 17.1 Oak Creek Basin Schematic
    Figure 17.2 Lynn Creek Basin Schematic
    Figure 17.3 Surcharged Pipes - Oak and Lynn Creek Basins - Existing Conditions
    Figure 17.4A Hydraulic Profile Surcharged Pipes - Oak Creek Basin - Existing Conditions
    Figure 17.4B Hydraulic Profile Surcharged Pipes - Oak Creek Basin - Existing Conditions
    Figure 17.5 Hydraulic Profile of Surcharged Pipes- Existing Conditions - Lynn Creek
    Figure 17.6 Proposed Sewer Improvements - Oak Creek Basin
    Figure 18.1 Little Salt Creek Basin Map
    Figure 18.2 Proposed Sewer Improvements - Little Salt Creek Basin
    Figure 18.3 Proposed Sewer Improvements with Storage Alternative - Little Salt Creek Basin
    Figure 19.1 Deadmans Run Trunk Sewer System
    Figure 19.2 East Campus Trunk Sewer System
    Figure 19.3 Havelock Basin Trunk Sewer System
    Figure 19.4 Surcharged Pipes - Existing Conditions - Deadmans Run, East Campus, and Havelock Basins
    Figure 19.5 Hydraulic Profile of Surcharged Pipes - Existing Conditions - Deadmans Run Trunk Sewer
    Figure 19.6 Locations of Pipes with Velocities <= 2.0 ft/sec - Existing Conditions - Deadmans Run, East Campus, and Havelock Basins
    Figure 20.1 Basin Map - Northeast Salt Creek
    Figure 20.2 Hydraulic Profile of Surcharged Pipes -Northeast Basin - Deadmans Run
    Figure 20.3 Proposed Sewer Improvements - Northeast Salt Creek
    Figure 21.1 Stevens Creek Basin Map
    Figure 21.2 Hydraulic Profile - Stevens Creek Trunk Sewer - Existing Conditions
    Figure 21.3 Proposed Sewer Improvements - Stevens Creek Trunk Sewer System
    Figure 22.1 Southeast Basin Map
    Figure 22.2 Proposed Sewer Improvements Southeast Basin
    Figure 23.1 Planning Area Tier I Improvements
    Figure 23.2 Planning Area Tier II Improvements
    Figure 23.3 Planning Area Tier III Improvements
    Figure 23.4 Planning Area Storage Improvements
    Figure 23.5 Schematic Drawing of Storage Facilities
    Figure 23.6 General Layout of Storage Facilities
    Figure 23.7 Planning Level O&M Costs for Storage Facilities
    Figure 23.8 Modeled Peak Flows at Theresa Street WWTF
    Figure 23.9 Modeled Peak Flows at NE WWTF
    Figure 24.1 Existing WWTF Service Areas
    Figure 24.2 Theresa Street WWTF Projected MMAD Flows
    Figure 24.3 Theresa Street WWTF Aerial Photo with Future Tier I and II Improvements
    Figure 24.4 Proposed Southwest WWTF Service Area - Alternative 1
    Figure 24.5 West Side Salt Creek Trunk Sewer - Alternative 2
    Figure 24.6 Parallel East Side Salt Creek Trunk Sewer - Alternative 3
    Figure 24.7 Increased Storage - Alternative 4
    Figure 24.8 Theresa Street WWTF Tier III Improvements Area
    Figure 24.9 Northeast WWTF Projected MMAD Flows
    Figure 24.10 Northeast WWTF Future Improvements
    Figure 24.11 General Layout of WWTF Facilities
    Figure 25.1 Collection System Projected Maintenance Crew Requirements
    Figure 25.2 Proposed Locations for Flow Monitoring Facilities
    Figure 26.1 Annual Cost of Collection System Improvements
    Figure 26.2 Annual Cost of Theresa Street & Northeast WWTF Improvements
    Figure 26.3 Summary of Annual Improvements
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    Wastewater Facilities Master Plans