City Council Agenda Report
TO: Mayor McCord and Members of the City Council
FROM: Ken Irwin, City Manager
BY: Fernando Ulloa, City Engineer
MEETING DATE: December 6, 2022
ITEM NO: 5.4
SUBJECT: Approve the proposal from PACE Advanced Water Engineering for the WQCF Wastewater Expansion project and authorize staff to enter into a negotiated Consultant Agreement with a not to exceed cost of $969,470 for the Phase 3A design.
RECOMMENDATION
Motion to Approve the proposal from PACE Advanced Water Engineering for the WQCF Wastewater Expansion project and authorize staff to enter into a negotiated Consultant Agreement with a not to exceed cost of $969,470 for the Phase 3A design.
BACKGROUND
The City’s existing Wastewater Quality Control Facility (WQCF) is located at the easterly end of Walnut Avenue, approximately 1.5 miles east of city limits. The WQCF has a permitted wastewater treatment capacity of 2.25 MGD, with an approximate 2.25 MGD of reliable treatment capacity, and an existing average Dry Weather Flow of approximately 1.75 MGD.
The WQCF consists of three separate processes: The North Activated Sludge Treatment System (NASTS), the Advanced Integrated Pond System (AIPS), and the South Activated Sludge Treatment System (SASTS). The treated effluent is then pumped to percolation ponds for groundwater recharging. The current capacity for the NASTS is 0.8 MGD, AIPS is 0.2 MGD and the SASTS is 1.25 MGD.
The WQCF Phase 3A expansion will be a Membrane Bioreactor (MBR) treatment system with a minimum treatment capacity of 1.2 MGD. The MBR treatment system will include all necessary appurtenances associated for its implementation to the City’s existing WQCF treatment system.
In addition to the MBR treatment system, the Phase 3A expansion project will also include improvements to the screens at the influent pump station (IPS) to accommodate the MBR treatment process, a new influent pump station to serve as redundancy and/or supplement existing IPS, conversion of Pond #1 to be an emergency storage pond, a new sludge dewatering area of approximately 1.25 acres, and installing a second solids dewatering unit (screw press, belt press, other).
ANALYSIS
A Request For Proposals (RFP) for Engineering and Design Services was prepared and advertised.
Four proposals and estimated fees (based on hourly rates) were submitted by the following firms:
PACE Advanced Water Engineering
Black Water Consulting Engineers
Lee & Ro Water Infrastructure Engineers
Carollo Engineers
The proposals were reviewed by City staff and rated on the following criteria:
· Understanding of work to be performed
· Experience with similar types of work
· Quality of staff for work to be done
· Capability of developing innovative or advanced techniques · Demonstrated Technical Ability
The proposals received were very clear and concise and showed good understanding of the project, while also meeting the requirements set forth in the RFP. Staff recommends PACE Advanced Water Engineering for the design of this project based on the evaluation of their qualifications, experience, and innovative approach of utilizing existing infrastructure at the WQCF facility to implement the Phase 3A wastewater expansion project. PACE will also exceed the treatment capacity indicated in the City’s request for proposal by nearly double. This design will allow the city to operate at a new capacity of 3.45MGD vs. 2.9MGD from the other three proposals.
FISCAL IMPACT
Staff negotiated with PACE Advanced Water Engineering for a final and agreeable scope of work and fee of $969,470. Current funding source for this project will be from the Sewer CIP Fund, Account No. 606-790-7576.
$ 969,470 Design Cost
$ 96,947 10% Contingency
$1,066,417 Total WQCF Phase 3A Expansion Project Cost