Wastewater Master Plan
Overview
• Stockton City Council
• October 18, 2022
• Agenda Item No. 15.2
Presentation Topics
• Wastewater Master Plan Purpose and Coordination
with Other Plans
• Wastewater Master Plan Components
• City of Stockton Wastewater Service Area
• Future Land Use and Growth Assumptions
• Master Plan Results
• Next Steps
Wastewater Master Plan Purpose
and Coordination with Other Plans
Wastewater Rate Study
• Adopted in 2019
• Conclusions verified in
Appendix H of the
Master Plan
Wastewater Master Plan
• Last Wastewater Master Plan completed in 2008
• Evaluates existing and future wastewater system requirements • Develops list of Capital Improvement Projects (CIPs)
Public Facilities Fee Nexus
Study
Will be evaluating/updating
connection fees
RWCF Improvements
2011 Capital Improvement
and Energy Management Plan
and 2019 Modifications
Project Design Report define
treatment plant projects
Collection System Asset
Management Plan
2018 study identified
condition-based pipeline
rehabilitation needs
Wastewater Master Plan Components
Understand Existing
Conditions
Set Criteria and
Standards
Incorporate Growth
Projections and
Conduct Capacity
Evaluations
Develop
Recommendations
and Funding
Requirements
Chapter 1 – Introduction
Chapter 2 – Existing Wastewater Collection System
Chapter 3 – Existing Wastewater Flows
Chapter 4 – Collection System Planning, Design
and Performance Criteria
Chapter 5 – Hydraulic Model Development
Chapter 6 – Analysis of Existing Flow Conditions
Chapter 7 – Analysis of Future Flow Conditions
Chapter 8 – Recommended Wastewater Collection
System Capital Improvement Program
City of Stockton Wastewater Service Area
The Wastewater Master
Plan evaluates entire
Sphere of Influence
• Existing collection
system is defined by 10
subareas or “Systems”
• Some unincorporated
islands are not
currently served
Future Land Use
and Growth Assumptions
• Future Study Areas and Planned
Development in the wastewater service
area reviewed by and confirmed with
the City Community Development
Department (CDD)
• Future (2040) needs based on
anticipated growth within the Future
Study Areas, Planned Developments and
other areas
• Buildout needs based on anticipated
growth as defined by full
implementation of the
adopted Envision
Stockton 2040 General Plan
• Modeling indicates some existing system capacity deficiencies in gravity mains and lift stations.
• Ongoing Rehabilitation & Replacement (R&R) program is needed to improve system operations and reliability.
• System improvements and R&R program through 2024 are
funded under the current 2019-2024 Rate Study. Funding for future work will be considered in subsequent rate studies. • Improvements within specific future development areas are not included in the CIP .
• Ongoing monitoring and pump station condition assessment are needed to further define some system improvements.
Wastewater Master Plan Conclusions
Modeled Existing Capacity
Deficiencies in Downtown Area
(Non-critical surcharging)
WWMP CIP Projects
Figure 8-1 and Table 8-1
provide a CIP roadmap
through 2040
Recommendation
City Council approve a resolution to adopt the 2022 Wastewater Master Plan Update prepared in concurrence with the Envision Stockton 2040 General Plan Update.