Regional Wastewater System
Buffalo Creek Interceptor System
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South Mesquite Creek Regional Wastewater Treatment Plant Peak Flow Management and Expansion, Project No. 301-0525-18; Amendment No. 8; and Buffalo Creek Parallel Force Main, Project No. 507-0640-24; Partial GMP No. 1
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SUBJECT
recommendation
Authorize funding to Archer Western Construction, LLC in the amount of $936,308 for Amendment No. 8 to the Construction Manager At-Risk (CMAR) Agreement for work related to partial Guaranteed Maximum Price (GMP) No. 1 for the Buffalo Creek Parallel Force Main (BCPFM).
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PURPOSE
The CMAR has submitted a partial Guaranteed Maximum Price (GMP) No. 1 for an early plug valve procurement work package for the Buffalo Creek Parallel Force Main project. Future amendments will be presented to the Board as the 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. 8 to the Construction Manager At-Risk as follows:
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CMAR: |
Archer Western Construction, LLC (Archer Western) |
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Scope: |
Construction, Buffalo Creek Parallel Force Main Partial GMP No. 1 |
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Project: |
No. 507-0640-24, Buffalo Creek Parallel Force Main |
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Amount: |
$936,308 for Construction |
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Committee: |
This item will be an item on the June 25, 2025, Wastewater 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 |
☐ 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
• Flow monitoring studies show the South Mesquite Creek Regional Wastewater Treatment Plant (RWWTP) has influent flows higher than its rated wet weather capacity of 82.5 MGD (million gallons per day). The South Mesquite Creek RWWTP Peak Flow Management preliminary design report determined that onsite storage facilities need to be provided to store peak flows in excess of the wet weather capacity with a phased approach that will provide early peak flow relief for the facility.
• The Capacity Assessment Study of the southern service area shows that the South Mesquite Creek RWWTP needs to expand from 33 MGD to 41 MGD average daily flow by 2026 to meet the growth projections through 2033.
• Provide condition assessment and criticality assessment to determine which critical items need to be repaired or replaced in the expansion project, and which items to be included as part of the master plan.
• A 2023 Feasibility Analysis for Conveyance Alternatives Report recommended a new Buffalo Creek Lift Station No. 2 and Buffalo Creek Parallel Force Main to convey flows from the Buffalo Creek Interceptor System to the new headworks at the South Mesquite Creek RWWTP.
• Divert Buffalo Creek Parallel Force Main and Buffalo Creek Force Main flows to a new Headworks at South Mesquite to improve peak flow management at South Mesquite Creek RWWTP and increase wastewater conveyance capacity in the Buffalo Creek Interceptor System to accommodate growth in Forney, Heath, and Rockwall.
PROJECT COMPONENTS
• Early peak flow relief includes upgrades to existing influent pump station no. 1, force main, and re-purposing an existing basin for peak flow storage basin no. 3.
• Peak flow management includes new parallel 42-inch force mains, new headworks facility no. 2, new peak flow storage basin no. 1 and supporting facilities.
• Expansion of the RWWTP to 41 MGD includes a primary clarifier, aeration basins, blower building, secondary sludge pump station, tertiary filters, disinfection, effluent metering, plant water pump station, solids handling, and supporting facilities.
• Approximately 10,400-feet of 42-inch force main will parallel the existing 36-inch force main from Buffalo Creek Lift Station No. 2 (BCLS2) to the South Mesquite Creek Regional Wastewater Treatment Plant. The 60% CMAR estimated construction cost for the force main is $19,334,700 including estimated CMAR fees.
BCPFM PARTIAL GUARANTEED MAXIMUM PRICE (GMP) NO. 1
• Bid Package 11 - Early Plug Valve Procurement
o 5 - 42-inch
o 2 - 36-inch
o 1 - 24-inch
• Allowance for 10% tariffs
The total 60% CMAR estimate for the solicitation set included herein totaled $1.7 million
To determine the Partial GMP No. 1 associated with this Amendment No. 8, the following table details the costs of the bid work package, general conditions, CMAR contingency, and the CMAR fee.
Major Scope of Work Description - Lump Sum Amount
BCPFM Partial GMP No. 1
Bid Package 11 - BCPFM Valve Procurement $726,393
Allowances for 10% Tariffs $72,640
Total Construction Cost $799,033
General Conditions $67,918
(@8.5% of the Estimated Construction Costs)
Total Cost of Work $866,951
CMAR Fees (@6.5% of the Cost of Work) $56,352
CMAR Contingency (@1.5% of the Cost of Work) $13,005
BCPFM Partial Guaranteed Maximum Price No. 1 $936,308
(Sum of Total Cost of Work and CMAR Fees)
The following tables are included as attachments:
Attachment A - Total Contract Price Summary
Attachment B - Contract Amendment Summary
Attachment C - Project Cost and Schedule
FUNDING
Funding for Project No. 507-0640-24 in the amount of $936,308.00 to Archer Western Construction, LLC, is to be made available from the Buffalo Creek Interceptor System Construction Funds.