Panther Creek Wastewater Treatment Plant System
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Panther Creek Wastewater Treatment Plant (WWTP) Expansion to 15 MGD; Project No. 307-0493-18; Change Order No. 4
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SUBJECT
recommendation
Authorize a reduction to the construction contract in the amount of $5,153,729 to Crossland Heavy Contractors, Inc. for the Panther Creek Wastewater Treatment Plant Expansion to 15 MGD project.
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PURPOSE
This change order authorizes the removal of the Maintenance Building, the removal of the Administration Building Annex, the removal of a portion of paving around the Main Electrical Building area and the removal of the sidewalk along Fields Parkway from the construction contract. In addition, this change order authorizes the relocation of electrical conduits by Coserv that are in conflict with a drainage channel at the site.
RECOMMENDATION
The Executive Director, NTMWD staff and HDR Engineering, Inc. recommend the Board of Directors authorize a change order as follows:
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Contractor: |
Crossland Heavy Contractors, Inc. |
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Scope: |
Change Order No. 4 |
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Project: |
No. 307-0493-18, Panther Creek Wastewater Treatment Plant Expansion to 15 MGD |
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Amount: |
($5,153,729) credit |
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Committee: |
This will be a Champion Update at the December 17, 2025, Wastewater Committee meeting |
DRIVER(S) FOR THIS PROJECT
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Strategic Objective: |
1.1: High Quality Services 1.2: Successfully Deliver Capital Program |
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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 Panther Creek Wastewater Treatment Plant (WWTP) serves a portion of the City of Frisco. The WWTP currently has a permitted discharge capacity of 10 million gallons per day (MGD) annual average daily flow (AADF). Population growth projections from the City of Frisco indicate that an expansion to the Panther Creek WWTP will be needed to treat the resulting increase in wastewater flows.
PROJECT PURPOSE
• Expand the treatment capacity of the Panther Creek WWTP from the current 10 MGD average daily flow to 15 MGD average daily flow with a peak two-hour flow of 45 MGD.
• Population growth projections from the City of Frisco indicate that an expansion to the plant will be needed to treat the resulting increase in wastewater flows.
PROJECT COMPONENTS
Construction and/or replacement of the following facilities:
• New peak flow storage tank
• New primary clarifier
• New secondary treatment facilities, including an aeration basin with biological nutrient removal (BNR) capabilities and a secondary clarifier
• Additional primary sludge pumping capacity in the existing Primary Sludge Pump Station
• New return activated sludge (RAS)/waste activated sludge (WAS) pump station
• New tertiary filtration facility
• New ultraviolet (UV) disinfection facility
• New plant water pump station
• New Parshall flume and parallel outfall pipeline
• Plant drain system improvements
• Increased solids dewatering capacity with screw presses
• Optimization of existing sludge storage facilities to improve mixing and odor control.
• Associated sitework, yard piping, electrical feed and distribution, emergency generators, and instrumentation and controls (I&C) work to support the expansion.
• Aesthetics improvements, including odor control and landscaping.
• A new storage/maintenance building with shared space with the City of Frisco.
• Expansion of the existing Administration Building
PROPOSED CHANGE ORDER
• A new maintenance and storage building shared with the City of Frisco will be removed to lower construction costs.
• Expansion of the existing administration building will be removed to lower construction costs.
• Installation of a public sidewalk along Fields Parkway was requested by the City of Frisco as part of the site plan development and approval. Once construction started it was discovered that the sidewalk was not constructable per the contract documents due to the grading performed for the new Fields Parkway construction. The City of Frisco agreed to remove the sidewalk from the scope of the project as part of the efforts to save on the construction cost.
• Based on the poor soil conditions of the site, all new pavement on the project requires over-excavation and installation of select fill. While excavating the area around the new Main Electrical Building, unknown utilities were discovered in conflict with the subgrade preparation. Following discussions with the City of Frisco Fire Marshall a portion of the paving around the Main Electrical Building is proposed to be removed from the project scope. The removal of the pavement area does not impact the fire lanes.
• One of the new drainage channels to be constructed as part of the project crosses a previously unknown Coserv easement. In agreement with Coserv and the City of Frisco, the Coserv conduits will be lowered at the location of the crossing to meet code clearances. This is an unanticipated construction cost increase.
CHANGE ORDER NO. 4
Description Amount Days
Original Contract Amount $170,618,000 1,095
Prior Change Order(s) Total ($1,457,575) 25
Proposed Change Order No. 4
Removal of Maintenance Building (credit) ($3,112,226) 0
Removal of Administration Building Annex ($1,924,921) 0
(credit)
Removal of Fields Parkway Sidewalk outside ($69,160) 0
of WWTP (credit)
Removal of a portion of paving around Main ($56,829) 0
Electrical Building (credit)
Relocation of Coserv electrical conduits in $9,407 0
conflict with WWTP drainage channel
Proposed Change Order No. 4 Amounts (credit) ($5,153,729) 0
Revised Contract Amounts $164,006,696 1,120
FUNDING
Funding in the amount of ($5,153,729) will be credited back to the Panther Creek Wastewater Treatment Plant Construction Funds.