Regional Wastewater System
title
South Mesquite Creek Regional Wastewater Treatment Plant Peak Flow Management and Expansion, Project No. 301-0525-18; Amendment No. 7, Partial GMP No. 6, and Engineering Services During Construction
end
SUBJECT
recommendation
Authorize funding to Archer Western Construction, LLC in the amount of $49,650,787 for Amendment No. 7 to the Construction Manager At-Risk (CMAR) Agreement and authorize funding to Carollo Engineers, Inc. in the amount of $1,308,300 for Engineering Services During Construction of the work related to Guaranteed Maximum Price (GMP) No. 6, for the South Mesquite Creek Regional Wastewater Treatment Plant (RWWTP) Peak Flow and Expansion project.
end
PURPOSE
The CMAR has submitted a partial GMP No. 6 for the continuation of the 42-inch parallel force mains, ultraviolet disinfection (UV), tertiary filter, and non-potable water pump station construction and the procurement of dewatering, UV, and filter equipment. Future amendments will be presented and recommended 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. 7 to the Construction Manager At-Risk and an Engineering Services Agreement as follows:
|
CMAR: |
Archer Western Construction, LLC (Archer Western) |
|
|
|
|
Consultant: |
Carollo Engineers, Inc. (Carollo) |
|
|
|
|
Scope: |
Construction, Partial GMP No. 6 Engineering Services During Construction for GMP No. 6 |
|
|
|
|
Project: |
No. 301-0525-18, South Mesquite Creek Regional Wastewater Treatment Plant Peak Flow Management and Expansion |
|
|
|
|
Amount: |
$49,650,787 for Construction, $1,308,300 for Engineering Services During Construction |
|
|
|
|
Committee: |
This will be an item on the January 22, 2025, Wastewater Committee meeting agenda. |
DRIVER(S) FOR THIS PROJECT
|
Strategic Objective: |
1.1 High Quality Services 1.4 Reliable and Resilient Systems |
|
☒ Regulatory Compliance |
☐ Asset Condition |
|
☒ Capacity |
☐ Redundancy/Resiliency |
|
☐ Relocation or External Requests |
☐ Operational Efficiency |
|
☐ Safety |
☐ Administrative |
|
☐ Policy |
☐ Other _____________ |
BACKGROUND
PROJECT PURPOSE
• Flow monitoring studies show the South Mesquite Creek RWWTP to have 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 recommended 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 the South Mesquite Creek RWWTP needs to expand from 33 MGD to 41 MGD average daily flow by 2028 to meet the growth projections through 2033.
• Provide condition assessment and criticality assessment to determine which items need to be repaired or replaced in the expansion project and which should be included in 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 Creek RWWTP to improve peak flow management 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 paralleling the existing 36-inch force main from Buffalo Creek Lift Station No. 2 (BCLS2) to the South Mesquite Creek RWWTP.
PARTIAL GUARANTEED MAXIMUM PRICE (GMP) NO. 6
• Bid Package 8 - 42-inch parallel force mains downstream section
• Bid Package 9 - UV, tertiary filter, NPW pump station construction
• Bid Package 10 - dewatering, UV, and filter equipment procurement
• Allowances for 90% to 100% design progression changes, bid exclusions, miscellaneous concrete repair and crack injection, distributions structure filter complex no. 2 modifications, additional pavement and road replacement at headworks no. 1, reprogramming of existing equipment, procurement and installation of valves and or fittings in dewatering facility, and equipment, appurtenances and materials for early incorporation of the peak wet weather flow storage basin no. 1
The total 90% CMAR estimate for the solicitation set included herein totaled $52.99 million.
Attachment A details the costs of the bid work package, general conditions, CMAR contingency, and CMAR fee to determine the Partial GMP No. 6 associated with Amendment No. 7.
ENGINEERING SERVICES AGREEMENT (ESA)
The ESA with Carollo Engineers, Inc. is for engineering services during construction for work related to GMP No.6 for the South Mesquite RWWTP Peak Flow Management and Expansion.
The services will consist of:
• Monthly project management and coordination
• Pre-construction and bi-weekly construction progress meetings
• Review of shop drawing submittals, requests for information, proposed change orders, payment requests, and operation and maintenance (O&M) manuals
• Site visits and structural engineer inspections
• Agency coordination, such as with City of Mesquite and the Texas Commission on Environmental Quality (TCEQ)
• Development of demolition closure plans, record drawings and update existing plant operations and maintenance (O&M) Manual
• Factory Witness Testing of the programmable logic control (PLC) hardware and software
• Start-up and commissioning support
The total contract price summary and the contract amendment summary are included as Attachment B, and project cost and schedule are included as Attachment C.
FUNDING
Funding to Archer Western Construction, LLC in the amount of $49,650,787 and to Carollo Engineers, Inc. in the amount of $1,308,300 is to be made available utilizing the Regional Wastewater System Extendable Commercial Paper (ECP) Program as the appropriation source; issuance of ECP notes will occur as cash needs arise.