Buffalo Creek Interceptor System
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Buffalo Creek Parallel Interceptor Phase II; Project No. 507-0636-24; Engineering Services Agreement - Final Engineering
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SUBJECT
recommendation
Authorize funding in the amount of $2,157,011 to HDR Engineering, Inc. for an engineering services agreement for the final design of the Buffalo Creek Parallel Interceptor Phase II project.
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PURPOSE
This project will allow for increased wastewater conveyance capacity in the Buffalo Creek Interceptor System by constructing the second phase of a parallel interceptor system along Buffalo Creek from Farm-to-Market Road (F.M.) 740 to the Buffalo Creek Lift Station to accommodate growth in the cities of Forney, Heath, and Rockwall.
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: |
HDR Engineering, Inc. |
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Scope: |
Final Engineering Design |
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Project: |
No. 507-0636-24, Buffalo Creek Parallel Interceptor Phase II |
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Amount: |
$2,157,011 |
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Committee: |
This was an item on the September 24, 2025, Wastewater 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 2021 Buffalo Creek Interceptor System Capacity Assessment and Assurance report recommends a new parallel interceptor to meet flow projections due to population growth in the cities of Forney, Heath, and Rockwall. Phase I (NTMWD Project No. 507-0484-17) extended from the Buffalo Creek Wastewater Treatment Plant to just north of F.M. 740, and the pipeline was placed in service in 2023.
PROJECT PURPOSE
• Final design of a parallel interceptor from north of F.M. 740 to Buffalo Creek Lift Station to increase conveyance capacity, reduce existing surcharges, and provide redundancy and resiliency within the wastewater system as recommended by the capacity assurance report.
• Completion of this project is needed to decommission the Buffalo Creek Wastewater Treatment Plant.
• The planning level estimated construction cost for the project is $68,380,000.
PROJECT COMPONENTS
• Approximately 32,000 linear feet of 60-inch parallel interceptor, including tunneling, traffic control, and odor control.
• One permanent billing flow meter parallel to the existing Heath 740 Meter Station.
• Manhole rehabilitation of approximately 83 manholes on the existing Buffalo Creek Interceptor.
• Access improvements across existing drainages to facilitate maintenance along the interceptor system.
BASIC SERVICES
• Final Design Services
• Bid Phase Services
SPECIAL SERVICES
• Geotechnical Engineering
• Survey
• Cultural & Archaeological Services
• Permitting
ENGINEERING SERVICES FEE
Description Amount
Basic Services $1,825,160
Special Services $331,851
Requested Amount $2,157,011
FUNDING
Funding to HDR Engineering Inc. in the amount of $2,157,011 is to be made available from the Buffalo Creek Interceptor System Construction Funds.