InterLinc: Wastewater Facilities Master Plan Update

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

All documents in Acrobat (PDF) format

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

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

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

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

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

25.3.1 I/I Flow Reduction
25.3.2 Foundation Drains - Sump Pumps
25.3.3 Service Lateral Repairs
25.3.4 Low Flow Plumbing Devices

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 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 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 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 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 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

November 2007 UpdateAdopted 3-17-08

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

November 2007 Update
Adopted 3-17-08

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