Wastewater Master Plan Overview
Council Water Committee
October 13, 2022
Agenda Item No. 3.4
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
Key Assumptions
Wastewater Master Plan Conclusions
Example Recommendations
Next Steps
Wastewater Master Plan Purposeand 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 areas 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
Key Assumptions
Wastewater System Hydraulic Model: Updated and calibrated to accurately simulate actual system conditions Facility Capacity Evaluations: Evaluations for lift stations, force mains and gravity mains based on industry standards for collection system sizing and operations
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
Recommendations in Downtown Areafor Existing Conditions (Non-critical surcharging)
WWMP CIP Projects
Next Steps
Wastewater Master Plan Review and Adoption
October 5: Water Advisory Group
October 13: Council Water Committee
October 18: City Council Adoption
Recommendation
Forward item to the City Council for consideration and approval 12