Wet Weather Basin Improvements, Phase 1, DP 100022
Summary
SCH Number
2025120809
Public Agency
Central Contra Costa Sanitary District
Document Title
Wet Weather Basin Improvements, Phase 1, DP 100022
Document Type
NOE - Notice of Exemption
Received
Posted
12/18/2025
Document Description
Central San has five wet weather storage basins at the Treatment Plant ( Plant): Basin A North, Basin A South, Basin B, Basin C, and Basin D. The basins, with the exception of Basin A South, are located north of Imhoff Drive and have a combined volume of 188 million gallons. The basins are used for wet weather storage, treatment plant diversions, and final effluent diversions associated with outfall inspections that take place approximately every ten years. The scope includes several items to increase the functionality of the basins, improve safety for Operations and Maintenance staff, and protect the basins from flood risks. The overall Project is
progressing to 60 percent design, and the construction phase is currently planned for the May -October 2026 dry weather season. The Project scope is to construct a 6 -foot -tall berm around the FWLS, replace the access road, improve drainage, repair one slope failure, and relocate light poles.
Contact Information
Name
Michelle Peon Del Valle
Agency Name
Central Contra Costa Sanitary District
Job Title
Engineering Assistant III
Contact Types
Lead/Public Agency
Phone
Location
Cities
Martinez
Counties
Contra Costa
Regions
Citywide
Zip
94553
Notice of Exemption
Exempt Status
Statutory Exemption
Type, Section or Code
Section 15301
Reasons for Exemption
It is exempt since it involves minor alterations to existing public facilities involving no expansion of use.
County Clerk
Contra Costa
Attachments
Notice of Exemption
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