Title
Approving a professional services supplemental agreement with Plus Six Engineering, LLC in the amount of $293,661 to provide Owner's Representative Services associated with the Central Wastewater Treatment Plant Expansion Phase 1 project, and authorizing the City Manager to execute the same.
Summary
This agenda item is presented for the purpose to request City Council approval to extend the Owner’s Representative services, provided by Plus Six Engineering, in association with the Central Wastewater Treatment Plant Expansion Phase 1 project. This item is supports the Infrastructure pillar of the Strategic Plan.
The City retained the services of Plus Six Engineering as Owner’s Representative during final design and bid phases for the Central Wastewater Treatment Plant Phase I Expansion in November of 2018. After completion of design in November 2019, City Council approved Plus Six to serve as the City’s representative, managing and administering the construction contract.
The original scope of work for the project included Construction Manager, Resident Project Representative, Specialty Inspectors, Commissioning and Start-up specialist, support staff and materials testing lab. As with the request for extension of the construction contract with BAR Constructors (“BAR”) for an additional 113 days, support to continue some of the same services will also be necessary on the behalf of City by the Owner’s Representative.
The original Construction Contract period, 11/19/2019 to 10/12/2021 (substantial completion) and 12/22/2021(final completion), nor the previously approved time extension for current substantial completion 12/28/2021 or current final completion 2/26/2022 are not attainable by BAR mainly due to extenuating circumstances related to pandemic COVID-19 impacts. Therefore, additional time will be necessary to complete project and construction administrative services will also need to be extended.
Completion time for construction of Central Wastewater Treatment Plant Expansion, Phase 1 has been increased due to various increased scope items and COVID-19 related delays. The proposed request is to extend the construction schedule, as BAR plans to achieve Substantial Completion in June 2023, and Final Completion on August 2023, AND Owner’s Representative Services through August, 2023.
Plus Six Engineering’s team is needed to serve as the City’s representative and to continue management and administration of the construction contract for the benefit of the City. The scope of work for this project includes continuing services with corresponding durations:
Plus Six staff will continue to provide construction phase services for an extended duration of the project to the anticipated Substantial Completion and Final Completion of construction for this project.
Project Background
The City of Pflugerville is in the process of expanding the Central Wastewater Treatment Plant from its current permitted capacity of 5.3 MGD to 10.0 MGD (35 MGD peak two-hour flow) to meet the City’s needs based on historical trends and projected population growth. In addition, the treatment processes are being upgraded to provide biological nutrient removal (BNR) of phosphorous to replace the existing chemical phosphorous precipitation process. Plus Six Engineering, LLC (PSE) serves as Owner’s Representative for the Central Wastewater Treatment Plant Expansion. Freese and Nichols, Inc. (FNI) serves as Engineer of Record for planning, design and construction phase engineering services for the improvements. BAR Constructors is the General Contractor for the Phase 1 construction project.
The plant expansion will be implemented in three (3) construction phases with Phase 1 expanding capacity to 7.25 MGD, Phase 2 to upgrade treatment processes in existing units and Phase 3 to expand capacity to 10 MGD.
The Phase 1 construction project will provide a new influent pump station, headworks, biological nutrient removal treatment system, clarifier, filters, UV disinfection system, non-potable water, and chemical feed systems. The construction will include three (3) new electrical buildings, two (2) diesel stand-by generators, improvements to the flood protection berm, general site civil improvements, electrical/communications upgrades, and improvements to site security and surveillance. Phase 1 when completed will bring the capacity of the treatment plant to 7.25 MGD, matching the TPDES Permit Phase 1.
The Phase 2 construction project will replace the equipment in the existing biological treatment basins and add basin volume and equipment to upgrade the units to achieve biological nutrient removal and rehabilitate the two (2) existing clarifiers. Phase 1 will also construct a new intermittent use effluent pump station which will enable the plant to discharge under high water level conditions in the receiving stream. It is anticipated that construction for Phase 2 will commence shortly after completion of Phase 1.
A future Phase 3 project will be required to complete the expansion to 10 MGD and will involve construction of a new clarifier and expansion or replacement of the solids dewatering process. The timing of Phase 3 will depend on the actual rate of population growth and corresponding increase in flow to the plant.
Prior City Council Action
City Council approved a professional services agreement with Plus Six Engineering, LLC at the November 27, 2018 City Council meeting to provide owner representative services associated with the Central Wastewater Treatment Plant Expansion Project.
City Council approved a professional services supplemental agreement #1 with Plus Six Engineering, LLC at the April 28, 2021 City Council meeting to provide owner representative services associated with design phase for the Central Wastewater Treatment Plant Expansion Project, Phase 2.
City Council approved a professional services supplemental agreement with Plus Six Engineering, LLC in the amount of $200,000.00 at the November 30, 2021 City Council meeting to extend construction phase services for the Central Wastewater Treatment Plant Expansion Project, Phase 1.
City Council approved a professional services supplemental agreement with Plus Six Engineering, LLC in the amount of $118,560 at the March 8, 2022 meeting to extend construction phase services for the Central Wastewater Treatment Plant Expansion Project, Phase 1.
City Council approved a professional services supplemental agreement with Plus Six Engineering, LLC in the amount of $399,942 at the September 27, 2022 meeting to extend construction phase services for the Central Wastewater Treatment Plant Expansion Project, Phase 1.
Deadline for City Council Action
Action is requested on March 28, 2023
Funding Expected: Revenue __ Expenditure _X_ N/A __
Budgeted Item: Yes __ No __ N/A _X*
*This project is listed in the Utility Capital Improvement Program Budget as Central WWTP Expansion Phase 1.
Amount: _$293,661.86_
1295 Form Required? Yes _X_ No __
Legal Review Required: N/A __ Required _X_ Date Completed: March 21, 2023
Supporting documents attached:
Plus Six Engineering Professional Services Supplemental Agreement
Draft Presentation
Recommended Action
Approve a professional services supplemental agreement with Plus Six Engineering, LLC in the amount of $293,661 to provide Owner's Representative Services associated with the Central Wastewater Treatment Plant Expansion Phase 1 project, and authorize the City Manager to execute the same.