Regional Water System
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Wylie Complex Filter Improvements; Project No. 101-0615-22; Amendment No. 4 to Construction Manager At-Risk; Work Authorization No. 3
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SUBJECT
recommendation
Authorize funding in the amount of $14,904,240 to Sundt Construction, Inc. for Amendment No. 4 to the Construction Manager At-Risk (CMAR) Agreement for the Wylie Complex Filter Improvements project for work related to Work Authorization No. 3 and authorize Owner’s Contingency of $1,829,000 for Work Authorization No. 3.
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PURPOSE
The CMAR has submitted a Cost of Work Proposal for Work Authorization No. 3 for the filter improvements at Water Treatment Plants (WTPs) II and III, and the removal and replacement of filter media at Water Treatment Plant (WTP) IV. Future amendments will be presented to the Board as remaining work packages are developed, procured, and evaluated.
RECOMMENDATION
The Executive Director and NTMWD staff recommend the Board of Directors authorize the Executive Director to execute Amendment No. 4 to the Construction Manager At-Risk as follows:
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CMAR: |
Sundt Construction, Inc. (Sundt) |
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Scope: |
Construction Services and Procurement |
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Project: |
No. 101-0615-22, Wylie Complex Filter Improvements |
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Amount: |
CMAR Work Authorization No. 3: $14,904,240 Owner Contingency for Work Authorization No. 3: $1,829,000 |
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Committee: |
This will be an item on the September 23, 2026, Water Committee meeting agenda |
DRIVER(S) FOR THIS PROJECT
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Strategic Objective: |
1.1 High Quality Services 1.4 Reliable and Resilient Systems |
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☒ Regulatory Compliance (Pre-emptive) |
☒ 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
• In December 2022, the Board of Directors approved Administrative Memorandum No. 5880 to authorize preliminary engineering services to Carollo Engineers, Inc. (Carollo). This included a condition assessment as well as a pilot study to determine the best media size and chemical constituents to optimize the performance of the filters.
• In February 2025, the Board of Directors approved Administrative Memorandum No. 25-6112 to authorize the final design services for this project to Carollo. This scope included the development of standard details for underdrain cleaning, underdrain replacement, media replacement, installation of Integral Media Support (IMS) caps, and access modifications to the effluent piping.
• In September 2025, the Board of Directors approved Administrative Memorandum No. 25-6185 to authorize a Construction Manager At-Risk agreement with Sundt, which included preconstruction and procurement services.
• In April 2026, the Board of Directors approved Administrative Memorandum No. 26-6253 for Work Authorization No. 1.
• In May 2026, the Board of Directors approved Administrative Memorandum No. 26-6266 for Work Authorization No. 2.
PROJECT PURPOSE
• Design and construct filter repairs and improvements to maintain continued service and to improve capacity after conversion to Biologically Active Filtration.
PROJECT COMPONENTS
• The design for filter improvements for Wylie Water Treatment Plant (WTP) II Filter Nos. 11 and 31 and WTP III Filter No. 26, designed by JQ Infrastructure, LLC under Project No. 101-0517-18, will be used.
• Plans developed by Carollo will be used for the remainder of the project.
• Install underdrain access at WTP II and WTP III and inspect filter underdrains at all four water treatment plants.
• Rehabilitate filters by either:
o Removal of media and installation of IMS caps, replacing sand and anthracite with optimally sized media
o Removal of media, flushing the underdrains, installing IMS caps, replacing the sand and anthracite with optimally sized media
o Removal of media, rebuilding the underdrains with IMS caps, replacing the sand and anthracite with optimally sized media
• Filter wall coating.
• Structural Modifications and Repairs (as deemed needed by Field Inspections).
• Repair or replacement of valves (as deemed needed by Field Inspections).
Work Authorization No. 3:
• Removal and replacement of media in 8 filters.
• Removal and replacement of underdrain systems as determined by filter inspection.
• Piping modifications to filter effluent piping at WTP II and WTP III.
• Structural modification to introduce expansion joints in Filter 26 at WTP III.
• Filter gullet wall repairs at Plant III and at other filters determined by investigation.
The total 100% CMAR cost for this work authorization, included herein, totaled $14,904,240 with ninety (90) additional days to reach substantial completion.
There is an Owner Contingency for Work Authorization No. 3 based on review of the risk register in the amount of $1,829,000.
The Owner’s Contingency is used at the sole discretion of the Owner to cover unforeseen costs, Owner-directed changes in the scope of Work, or any other unanticipated change in the Contract Price. These funds can only be accessed by the CMAR when and to the specific extent authorized by the Owner.
To determine Work Authorization No. 3 associated with this Amendment No. 4, the following table details the costs of the work package, CMAR Construction Support Costs, CMAR Contingency, and the CMAR fee.
Scope of Work Description - Work Authorization No. 3 Not to Exceed
Amount
Work Authorization No. 3 $14,904,240
Cost of Work (Sum of Work Packages) $11,652,976
CMAR Fees $859,143
Fixed Construction Support Costs $0
Time Sensitive Construction Support Costs $1,139,721
CMAR Contingency (based on Risk Register) $1,252,400
Work Authorization No. 3 not to exceed Cost of Work, $14,904,240
CMAR Fees, Construction Support Costs, and
CMAR Contingency
Work Authorization No. 3 Owner Contingency $1,829,000
(based on Risk Register)
INSPECTION SERVICES
NTMWD will utilize its own inspection staff to cover all inspection tasks. The costs to the NTMWD related to this internal inspection coverage for a 12-month construction duration were approved by the Board of Directors in May 2026 per Administrative Memorandum No. 26-6266.
FUNDING
Funding in the amount of $14,904,240 to Sundt Construction, Inc. and $1,829,000 Owner Contingency for Work Authorization No. 3 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.