Regional Water System
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Leonard Water Treatment Plant Phase III; Project No. 101-0653-24; Engineering Services Agreement - Preliminary Engineering
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SUBJECT
recommendation
Authorize funding in the amount of $4,564,900 to Carollo Engineers, Inc. for an engineering services agreement for preliminary design development of the proposed Phase III expansion of the Leonard Water Treatment Plant (WTP).
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PURPOSE
The purpose of this preliminary design service is to develop the design of the Leonard Water Treatment Plant (WTP) Phase III expansion project from the conceptual level up to the 30% design phase. Leonard WTP is part of the Bois d’Arc Lake Regional Water System. The phase III expansion will increase the treatment capacity of the Leonard WTP to 210 million gallons per day (MGD). Also, this preliminary design effort will produce engineering reports needed to support the Texas Water Development Board State Water Implementation Fund for Texas (SWIFT) funding application for final design and construction of the project.
RECOMMENDATION
The Executive Director and NTMWD staff recommend the Board of Directors authorize the Executive Director to execute an engineering services agreement (ESA) as follows:
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Consultant: |
Carollo Engineers, Inc. |
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Scope: |
Preliminary Engineering |
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Project: |
No. 101-0653-24, Leonard Water Treatment Plant Phase III |
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Amount: |
$4,564,900 |
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Committee: |
This will be an item on the March 25, 2026, Water Committee meeting agenda |
DRIVER(S) FOR THIS PROJECT
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Strategic Objective: |
1.2 Successfully Deliver Capital Program 1.4 Reliable and Resilient Systems |
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☐ Regulatory Compliance |
☐ Asset Condition |
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☒ Capacity |
☒ Redundancy/Resiliency |
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☐ Relocation or External Requests |
☐ Operational Efficiency |
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☐ Safety |
☐ Administrative |
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☐ Policy |
☐ Other _____________ |
BACKGROUND
The Leonard Water Treatment Plant (WTP) treats raw water from Bois d’Arc Lake. Plans are currently underway to provide additional raw water from Lake Texoma to supplement the water rights at Bois d'Arc Lake. The initial Phase I Leonard WTP development, completed in 2023, provided a capacity of 70 million gallon per day (MGD). Following a re-rating approval by the Texas Commission on Environmental Quality (TCEQ) in 2025, the Leonard WTP Phase I now has a production capacity of 81 MGD. Phase II, currently under construction, will increase the production capacity of the plant to 150 MGD. Phase III will increase the treatment capacity of Leonard WTP to 210 MGD. In August 2024, Administrative Memorandum No. 24-6047 awarded conceptual design services for the Leonard WTP Phase III expansion. The conceptual design is now completed, and NTMWD is ready to proceed with the preliminary design.
PROJECT PURPOSE
• The ultimate planned capacity of Leonard WTP is 280 MGD.
• The projected demand growth in the service area of Leonard WTP calls for Leonard WTP to have an available treatment capacity of 210 MGD no later than Spring 2031.
• This effort will evaluate the existing Phase I and Phase II processes to identify opportunities for optimal use of existing facilities.
• Take the design from the conceptual level to 30% design to achieve a production capacity of 210 MGD.
• The conceptual design level estimated construction cost to achieve 210 MGD production capacity is $508,521,000.
PROJECT COMPONENTS
• Develop preliminary design documents to 30% for Leonard WTP expansion facilities to achieve 210 MGD production capacity. Documents will include a design criteria sheet with updated hydraulic profile, general site and grading plans, process flow diagrams, basic architectural, structural and mechanical plan views, building mechanical air flow schematics, electrical diagrams and site plan, generator sizing, preliminary process and instrumentation diagrams, network architecture diagrams, major equipment lists, and equipment specifications.
• Design connection of the Phase III process units to existing Phase I and Phase II infrastructure.
• This service agreement will enable master planning of the remaining process facilities needed to achieve the ultimate production capacity of 280 MGD.
• Develop and review documents for Construction Manager At-Risk (CMAR) procurement, including Request for Qualifications and Request for Proposals.
• Produce environmental assessment report and engineering feasibility report to support Texas Water Development Board SWIFT funding application for final engineering design and construction.
• Conduct review of current and potential drinking water regulations to ensure that design is compliant with treatment standards and meets targets.
• Perform a study to optimize existing processes, identify opportunities/hydraulic or process bottlenecks in Phase I and Phase II.
• Determine 30% level opinion of probable construction cost.
BASIC SERVICES
• Site master planning and conceptual design refinement
• Evaluation of Phase III connection to Phases I and II at the Leonard WTP
• Basis of design development
• Hydraulic profile development
• Electrical, Instrumentation and Controls development
• Preliminary design development and report
• CMAR procurement services
• Texas Commission on Environmental Quality (TCEQ) coordination
SPECIAL SERVICES
• Site surveying
• Geotechnical investigation
• Tracer Study Evaluation
• Environmental Services
• Chemical Optimization Study for corrosion control, manganese removal, total organic carbon removal and ammonia removal.
ENGINEERING SERVICES FEE
Description Amount
Basic Services $4,726,400
Special Services $638,500
Reallocate Funds from unused services ($800,000)
that are Available from Conceptual Design
(Administrative Memorandum No. 24-6047)
Requested Amount $4,564,900
FUNDING
Funding in the amount of $4,564,900 to Carollo Engineers Inc is to be made available from the Regional Water System Construction Funds.