Regional Water System
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Wylie Water Treatment Plant Raw Water Pump Station No. 4; Engineering Services Agreement; Project No. 101-0647-24
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SUBJECT
recommendation
Authorize funding for an engineering services agreement for a feasibility study and conceptual design of the Wylie Water Treatment Plant (WTP) Raw Water Pump Station No. 4.
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PURPOSE
This study will assess the feasibility of a new raw water pump station that would access deeper levels of Lavon Lake and provide additional reliable supply at the Wylie water treatment plants. This option is one of the strategies identified in the District’s Long-Range Water Supply portfolio.
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: |
Arcadis U.S., Inc. |
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Scope: |
Feasibility Study and Conceptual Design |
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Project: |
Wylie Water Treatment Plant Raw Water Pump Station No. 4 |
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Amount: |
$4,887,600 |
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Strategic Objective: |
1.2: Successfully Deliver Capital Program, 1.4: Reliable and Resilient Systems |
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Committee: |
This will be an item on the April 24, 2024, Water Committee meeting agenda |
DRIVER(S) FOR THIS PROJECT
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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
Lavon Lake is the original source of water supply for North Texas Municipal Water District and the Wylie Water Treatment Plant (WTP) complex. Three raw water pump stations draw from Lavon Lake and serve the Wylie WTP complex. Raw Water Pump Station (RWPS) Nos. 1 & 2 have a combined capacity of 285 million gallons per day (MGD) and RWPS No. 3 has a capacity of 537 MGD. These three pump stations access lake levels between 461 to 467 feet. At these levels, the current pump stations do not optimize NTMWD’s full water right in Lavon Lake.
Previous studies conducted have reviewed the potential for a fourth RWPS at Lake Lavon:
• NTMWD Water Supply Resiliency Plan Phase II in 2021
• Long Range Water Supply Plan (LRWSP), NTMWD Project No. 101-0587-21, in 2023
The Wylie RWPS No. 4 would potentially be a new 350 MGD facility accessing supplies down to an elevation of 451 feet mean sea level (ft MSL). The pump station would provide additional reliable supply but does not increase the Lavon Lake water right.
PROJECT PURPOSE
• Provide 350 MGD pumping capacity and ability to intake at a depth of 451 ft MSL elevation from Lavon Lake.
• Evaluate and make recommendations for the connection to all four Wylie WTPs, providing redundancy for raw water distribution within the Wylie complex in the event of problems at one of the other raw water pump stations.
• Evaluate potential and provide a recommendation for two options:
a. RWPS No. 4 to replace the aging RWPS No. 1 and/or RWPS No. 2 (with total capacity of 285 MGD)
b. consideration of these stations maintained for additional resiliency
• Locate a deeper lake access that could yield an additional 11 MGD of raw water.
• The planning level estimated cost for construction is $328,000,000.
PROJECT COMPONENTS
• Data collection and review
• Water quality analysis at deeper lake levels
• Consideration of intake and pumps
• Transmission and yard piping connections to the Wylie WTPs
• Pump station site identification and selection
• Permitting and regulatory considerations
• Evaluation of project delivery methods
• Feasibility study report
• Conceptual design
• Operational strategy for all Raw Water Pump Stations
BASIC SERVICES
• Project management
• Feasibility study
• Conceptual design and layout
• Permitting and regulatory
SPECIAL SERVICES
• Tunneling design support
• Geotechnical borings
• Bathometric surveying
• Land surveying
CONSULTANT SELECTION PROCESS
A total of 3 engineering firms were interviewed and Arcadis U.S., Inc. was deemed as the most highly qualified firm for this project.
ENGINEERING SERVICES FEE
Description Amount
Basic Services $4,119,400
Special Services $768,200
Requested Amount $ 4,887,600
FUNDING
Funding to Arcadis U.S. Inc in the amount of $4,887,600 is to be made available utilizing the Regional Water System Extendable Commercial Paper (ECP) Program as the appropriation source; actual issuance of ECP notes will occur as cash needs arise.