Regional Water System
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Wylie Water Treatment Plant Raw Water Pump Station No. 4; Project No. 101-0647-24; Additional Engineering Services Agreement
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SUBJECT
recommendation
Authorize funding in the amount of $4,873,800 to Arcadis U.S., Inc. for additional engineering services for preliminary design of the Wylie Water Treatment Plant (WTP) Raw Water Pump Station No. 4.
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PURPOSE
The purpose of this project is the preliminary design of a new 350 million gallons per day (MGD) raw water pump station on a site along the Lavon Lake shoreline, as recommended in the feasibility study report. The pump station shall access supply water down to an elevation of 451 feet (ft) mean sea level (MSL), which is below the dead pool elevation of 453 ft MSL, ensuring full access to the conservation storage at Lavon Lake.
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: |
Additional Engineering Services - Preliminary Engineering Design |
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Project: |
No. 101-0647-24; Wylie Water Treatment Plant Raw Water Pump Station No. 4 |
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Amount: |
$4,873,800 |
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Committee: |
This will be an item on the October 22, 2025, 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
PROJECT PURPOSE
Lavon Lake is the original source of water supply for the Wylie Water Treatment Plant (WTP) complex. Currently, three raw water pump stations draw from the Lavon Lake and serve the Wylie WTP complex. The current pump stations do not optimize NTMWD’s full water rights in Lavon Lake. Previous studies, the NTMWD Water Supply Resiliency Plan Phase II in 2021 and the Long Range Water Supply Plan in 2023, had reviewed the potential for a fourth Raw Water Pump Station (RWPS) at Lake Lavon. As a result, a feasibility study and conceptual design was initiated in early 2024 under Administrative Memorandum No. 24-6014.
Based on recommendations from the study, a new raw water pump station with a rated firm capacity of 350 MGD and retaining existing Raw Water Pump Station No. 2 would provide the operational flexibility and meet the goal of long-term reliability and drought resiliency. Raw Water Pump Station No. 1 will be decommissioned as part of a separate project upon completion of RWPS No. 4.
PROJECT COMPONENTS
• Provide preliminary design of a 350 MGD intake and pump station with the ability to intake at a depth of 451 ft MSL elevation from Lavon Lake below the dead pool elevation of 453 ft MSL.
• Provide preliminary design of 17,000 linear feet of 96-inch and 60-inch transmission mains to convey flow north and south mixing area in the Wylie WTP complex.
• Connection to existing transmission mains for operational flexibility.
• The Engineer’s current opinion of probable construction cost (OPCC) is $453,000,000.
BASIC SERVICES
• Project management
• Pump station preliminary design
• Transmission main preliminary design
• Preliminary (30%) design drawings and OPCC
• Permitting and regulatory support and coordination related to:
o Section 404 and 408 pre-application meeting with the United States Army Corp of Engineers (USACE)
o Swift funding application
SPECIAL SERVICES
• Geotechnical (preliminary and final)
• Marine geophysical
• Land surveying
• Geophysical
• Subsurface utility engineering (SUE)
• Assistance with procurement of Construction Manager at Risk (CMAR)
CONSULTANT SELECTION PROCESS
• Arcadis US, Inc. is the current consultant engineer for the project. After evaluation and justification, NTMWD’s team recommends continuing to work with Arcadis, US Inc., as they are the most highly qualified firm for this project.
ENGINEERING SERVICES FEE
Description Amount
Basic Services $3,604,600
Reallocate unused services from Feasibility
and conceptual study as authorized by
Administrative Memorandum No. 24-6014 ($1,300,000)
Revised Basic Services $2,304,600
Special Services $2,569,200
Requested Amount (Basic and Special Services) $4,873,800
Arcadis U.S., Inc. has provided a total fee in the amount of $6,173,800 for these services. NTMWD staff recommend reallocating $1,300,000 of unused fee under Feasibility and Conceptual Study as authorized by Administrative Memorandum No. 24-6014 towards basic services to reduce the total fee to $4,873,800.
FUNDING
Funding in the amount of $4,873,800 to Arcadis U.S. Inc is to be made available from the Regional Water System Construction Funds.