DELTA WATER TREATMENT PLANTGROUNDWATER RECHARGE PROJECT Council Water Committee
November 9, 2023
Agenda Item No. 3.1
Project Description
Geotechnical investigation, design, and construction of groundwater recharge basins Project will be completed in two phases
Phase I - Geotechnical Investigation (complete)
Feasibility Study
Pre-Design of recharge basins
Phase II – Design & Construction
City of Stockton
North Stockton and South Stockton are served by City of Stockton Municipal Utilities Department Central Stockton area is served by California Water Service Company DWTP
Proposed Recharge Basin Location
Schedule
Geotechnical Investigation, Feasibility Study, & Pre-Design (Phase I) July 2022 – October 2023
Design and Construction (Phase II)
Engineering Design & Environmental - 2024
Construction – 2025
Groundwater Recharge Operation begins - 2026
Feasibility Study Components
Utility survey
Electrical resistivity survey
Cone Penetration Testing (CPT)
Soil borings and characterization
Downhole permeability testing of soil borings
Groundwater and test well installation
Aquifer testing
Physical and chemical analysis of soil and groundwater
Data analysis, recommendations, pre-design
Project Cost & Grant Funding
Sustainable Groundwater Management Act (SGMA) Grant funding of $300,000 for Phase I Geotechnical Investigation
Feasibility Report
Integrated Regional Water Management (IRWM) Grant funding of $1,900,000 for Phase II Design and Construction
Total project cost $14,500,000
Summary of Geotechnical Investigations
Su
3 Feet BGS
10 Feet BGS
20 Feet BGS
Suitability For Recharge
Suitability for Recharge
Suitability for Recharge
Suitability for Recharge
Preliminary Basin Design
3 Basins with forebays
Infiltration pipes
Habitat islands for migrating birds
Next Steps
RFP and contract for design/build of groundwater recharge basins RFP and contract for design and construction technical support
Thank you!
Questions/discussion?