The Delta Diablo District in California faces several infrastructure challenges in providing wastewater management services to its customers. One of the main challenges is the aging wastewater treatment infrastructure that requires significant investment to ensure its continued reliability and effectiveness. The district also faces challenges in managing the increasing volume of wastewater generated by the growing population it serves. Additionally, the district needs to invest in improving its wastewater collection system to reduce leaks and spills and to ensure that it meets regulatory standards for environmental protection. Despite these challenges, the Delta Diablo District is committed to providing efficient and sustainable wastewater management services to its customers through targeted investments and strategic planning.
Delta Diablo District, California
Population (Year): 200000 (2023)
Sample Highlights from the Capital Improvement Plan
Project ID
Project Title
Project Start Year
Project Description
Project Spend Total
Page Ref
Project Satus
398676
“Treatment Plant Electrical Switchgear Replacement”
2023
This project will replace the existing electrical switchgear to ensure continuous reliable power and treatment operations. This is a critical component of the treatment plant electrical power feed system.
5000000
59
Not Started
398686
Cogen System Improvement
2023
This project will replace the existing cogen engine, controls, and paralleling gear to ensure compatibility with the new switchgear, which is a critical component of the treatment plant electrical power feed system.
4850000
61
Not Started
398688
“Bridgehead Temporary Pipeline Installation & Replacement”
2023
This multi-phase project consists of installing a temporary 24-inch parallel pipeline that will immediately be placed in operation while a new permanent 24-inch pipeline is being designed and constructed. Installing the temporary pipeline is needed to provide reliable infrastructure in the near term to convey BHPS flow with the existing 18-inch pipeline to be utilized for redundancy and operational reliability needs, if necessary
700000
62
Not Started
398693
“Force Mains & Gravity Interceptors Cleaning & Maintenance”
2025
This project allowance is for cleaning and maintenance of the existing force mains and gravity interceptors to ensure ongoing operational reliability of the District’s conveyance system.
100000
64
Not Started
398698
RWF Condition Assessment
2024
The District’s Recycled Water Supply Agreement with Calpine expires in 2030, In accordance with the Agreement terms, Calpine is obligated to notify the District of its intent to continue receiving recycled water beyond 2030 by April 2025. This project will access the capital infrastructure needs to operate the RWF beyond 2030.
300000
67
Not Started
398634
Asset Management Program
2024
“This project will implement a formalized,
comprehensive business process to ensure
prioritized, cost-effective, and risked-based
maintenance and renewal of critical infrastructure
assets in the wastewater collection, conveyance,
and treatment systems to meet operational
effectiveness and reliability needs for District
customers. In addition, this project will expand
CMMS utilization, implement reliability-centered
maintenance (RCM) approach to support reliabilitybased asset management activities, data driven
decision making , and overall efficiency”
500000
56
Not Started
398692
Secondary Process Improvements
2023
“The project includes planning, design, and
construction of i) new Tower Trickling Filter
(TTF) pump station, ii) new aeration basins, iii)
retrofit of existing aeration basins to include
anaerobic selectors, iv) new blower, headers
and associated building, v) new mixed liquor
distribution box, and vi) new secondary clarifier.
The project components are needed to allow the
RRF to perform carbon only treatment using
activated sludge only (after existing tower
trickling filters are retired) through 2040
projected flows and loads. Planning/Design
started in FY21/22 with construction to
commence in FY 22/23. The project also
includes replacement of actuators on sluice
gates of the aeration basins to ease operation.
The project will include an evaluation of the
addition of a basin dewatering pump to facilitate
the basin operations and maintenance
activities.”
59500000
63
Ongoing
398693
“Force Mains & Gravity Interceptors Cleaning & Maintenance”
2025
“This project allowance is for cleaning and
maintenance of the existing force mains and
gravity interceptors to ensure ongoing
operational reliability of the District’s
conveyance system.”
100000
64
Not Started
398695
“Treatment Plant Structural Assessment and Rehabilitation”
2024
“This project will evaluate the condition of the RAS,
Mixed Liquor, Primary Effluent, and Secondary
Effluent underground pipelines to inform future
renewal needs to ensure ongoing operational
reliability.”
700000
66
Not Started
398698
RWF Condition Assessment
2024
“The District’s Recycled Water Supply Agreement
with Calpine expires in 2030, In accordance with the
Agreement terms, Calpine is obligated to notify the
District of its intent to continue receiving recycled
water beyond 2030 by April 2025. This project will
access the capital infrastructure needs to operate
the RWF beyond 2030.”
300000
67
Not Started
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