Regional Water System
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Wylie Complex Reclaim System Improvements; Project No. 101-0666-25; Engineering Services Agreement, Preliminary Engineering
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SUBJECT
recommendation
Authorize funding in the amount of $487,000 for an engineering services agreement with HDR Engineering, Inc. for preliminary design of the proposed Wylie Complex Reclaim System Improvements project.
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PURPOSE
The Engineer will evaluate the hydraulics of the WTP I and WTP II reclaim system , propose modifications , evaluate the capacity of WTP I and WTP II reclaim basins, and develop a matrix of options based on different operational conditions. A Preliminary Design Report will be provided incorporating the results of hydraulic evaluations, pipeline changes and additional reclaim volume options, system modifications, and recommendations.
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: |
Preliminary Engineering Design |
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Project: |
101-0666-25, Wylie Complex Reclaim System Improvements |
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Amount: |
$487,000 |
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Committee: |
This will be a Champion Update at the June 25, 2025, Water Committee meeting |
DRIVER(S) FOR THIS PROJECT
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Strategic Objective: |
1.1 High Quality Services |
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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
Historically, reclaim return flows at all water treatment plants were returned to the treatment process as raw water enters each plant, downstream of chlorine dioxide addition and mixing boxes. These reclaim return flows contain constituents that affect water chemistry as they are mixed, and the eventual overall finished water quality.
In particular, WTP I reclaim can become overloaded during normal operating conditions, particularly when WTP II is offline, resulting in impacts to WTP I’s water quality and filter capacity.
Similar challenges exist at Plants III and IV. Upgrades to the reclaim return at WTP III are currently under construction, and upgrades at WTP IV are included under a current design effort. Redirecting the reclaim flows to each water treatment plant’s mixing box will provide an opportunity for chemical dosing to facilitate the sedimentation process.
PROJECT PURPOSE
Improve finished water quality following conversion to biologically active filtration (BAF)
PROJECT COMPONENTS
• Evaluate the hydraulics and operations of the WTP I and WTP II reclaim system from the filters to the reclaim basins
• Propose modifications to pipelines
• Evaluate the capacity of WTP I and WTP II reclaim basins and develop a matrix of options to consider based on different operational conditions such as plant flow, frequency of backwash, and backwash parameters.
• Determine if any modifications to chlorine dioxide feed facilities at the WTP I and WTP II mixing structure are required, and any changes to other assets that are part of the WTP I and WTP II reclaim system.
• Provide a Preliminary Design Report incorporating results of hydraulic evaluations, pipeline changes, reclaim volume options, system modifications, and other recommendations.
BASIC SERVICES
• Preliminary and General Items
• Project Set-up and Administration
• Review System Performance Limiting Factors
• Evaluate Performance Limiting Factors
• Identify and Evaluate Alternatives
• Final Recommendations
SPECIAL SERVICES
• Subsurface Utility Exploration
CONSULTANT SELECTION PROCESS
• A total of 3 engineering firms, Freese and Nichols, Inc., HDR Engineering, Inc., and Garver, LLC. were interviewed and HDR Engineering, Inc. was deemed as the most highly qualified firm for this project.
ENGINEERING SERVICES FEE
Description Amount
Basic Services $ 453,000
Special Services $ 34,000
Requested Amount $ 487,000
FUNDING
Funding in the amount of $487,000 to HDR Engineering, Inc. is to be made available utilizing the Regional Water System Extendable Commercial Paper (ECP) Program as the appropriation source; issuance of ECP notes will occur as cash needs arise.