Title
91st Avenue Wastewater Treatment Plant Sub-Regional Operating Group Digester Dome Replacement - Construction Manager at Risk Construction Services Amendment - WS90100001 (Ordinance S-48592)
Description
Request to authorize the City Manager, or his designee, to execute an amendment to Agreement 144666 with PCL Construction, Inc., to provide additional Construction Manager at Risk Construction Services for the 91st Avenue Wastewater Treatment Plant Sub-Regional Operating Group Digester Dome Replacement project. Further request to authorize execution of amendments to the agreement as necessary within the Council-approved expenditure authority as provided below, and for the City Controller to disburse all funds related to this item. The additional fee for services included in this amendment will not exceed $600,000.
Report
Summary
The Digester Dome Replacement project is intended to replace the fixed domes covering four of the 10 anaerobic digesters at the 91st Avenue Wastewater Treatment Plant (WWTP) (Digesters 2, 3, 4 and 12). These existing domes are structurally deficient due to age and the corrosive environment within the digesters. The anaerobic digesters are critical to the solids treatment process at the plant. Replacement of the digester domes ensures operation at the highest levels of efficiency and operational resiliency. The project will include removal of the existing domes, fabrication and installation of the new domes, rehabilitation and coating of the digesters' interior walls, installation of protective coatings to the interior of the digester domes, and installation of roofing material and ancillary equipment on the exterior of the digester domes.
The purpose of this project is to procure the fixed dome for Digester 2 at the 91st Avenue WWTP. This dome is the second of four fixed domes being replaced as part of this Sub-Regional Operating Group (SROG) Digester Dome Replacement project. Construction activities, including demolition of the existing dome for Digester 2 and installation of the new dome, will be part of this contract through future amendments.
This amendment is necessary to begin the construction phase of the project for Digester Dome 2. This amendment will provide additional funds and time to the agreement.
The 91st Avenue WWTP is owned by the Sub-Regional Operating Group, which includes the cities of Tempe, Mesa, Scottsdale, Glendale and Phoenix, and is operated by the City of Phoenix.
Contract Term
The term of the agreement amendment is one year from issuance of the Notice to Proceed. Work scope identified and incorporated into the agreement prior to the end of the term may be agreed to by the parties, and work may extend past the termination of the agreement. No additional changes may be executed after the end of the term.
Financial Impact
- The initial agreement for Construction Manager at Risk Construction Services was approved for an amount not to exceed $925,000.
- An amendment was approved for an additional $1.4 million, including all subcontractor and reimbursable costs, for a new total amount not to exceed $2,325,000, including all subcontractor and reimbursable costs.
- This amendment will increase the agreement by an additional $600,000, for a new total amount not to exceed $2,925,000, including all subcontractor and reimbursable costs.
Funding for this amendment is available in the Water Services Department's Capital Improvement Program budget. The Budget and Research Department will separately review and approve funding availability prior to the execution of any amendments. Payments may be made up to agreement limits for all rendered agreement services, which may extend past the agreement termination.
Concurrence/Previous Council Action
The SROG Advisory Committee approved the project on Feb. 18, 2016.
The SROG Managers Committee approved the project on March 9, 2016.
The City Council approved:
- Professional Services Agreement 142545 (Ordinance S-42515) on May 4, 2016;
- Pre-Construction Services Agreement 142546 (Ordinance S-42516) on May 4, 2016;
- Construction Services Agreement 144666 (Ordinance S-43343) on March 22, 2017; and
- Construction Services Agreement 144666 Amendment (Ordinance S-46527) on April 15, 2020.
Location
91st Avenue WWTP
Council District: 7
Department
Responsible Department
This item is submitted by Deputy City Managers Karen Peters and Mario Paniagua, the Water Services Department, and the City Engineer.