City Council Memorandum
TO: HONORABLE MAYOR AND CITY COUNCIL DATE: FEBRUARY 28, 2023 FROM: PUBLIC WORKS DEPARTMENT WARD: 3
SUBJECT: AWARD BID NO. 7935 FOR THE CONSTRUCTION OF CHLORINE CONTACT BASIN 2 (CCB2) FREE CHLORINE MODIFICATIONS AT RIVERSIDE’S REGIONAL WATER QUALITY CONTROL PLANT TO SCW CONTRACTING CORP. OF FALLBROOK, CALIFORNIA, IN THE AMOUNT OF $1,431,185; FOR A TOTAL PROJECT COST OF $2,000,000 ISSUE:
Award Bid No. 7935 for the construction of Chlorine Contact Basin 2 (CCB2) Free Chlorine Modifications at Riverside’s Regional Water Quality Control Plant to SCW Contracting Corp. of Fallbrook, California, in the amount of $1,431,185; for a total project cost of $2,000,000.
RECOMMENDATIONS:
That the City Council:
Award a construction contract for Bid No. 7935 for the construction of Chlorine Contact Basin 2 (CCB2) Free Chlorine Modifications at Riverside’s Regional Water Quality Control Plant to SCW Contracting Corp. of Fallbrook, California, in the amount of $1,431,185; and Authorize the City Manager, or designee, to execute the construction contract, including making minor and non-substantive changes, subject to the availability of budgeted funds.
BACKGROUND:
The City of Riverside Public Works Department, Wastewater Division, is responsible for the collection, conveyance, and treatment of wastewater generated within the City of Riverside and the Communities Service Districts of Edgemont, Jurupa, Rubidoux, and the unincorporated community of Highgrove. Sewage treatment is performed at Riverside’s Regional Water Quality Control Plant (RWQCP), which provides primary, secondary, and tertiary treatment which has a hydraulic rating capacity of 46 million gallons per day (MGD). Discharge of treated effluent from RWQCP is mandated by the City’s National Pollutant Discharge Elimination System (NPDES) permit as authorized by the Clean Water Act, issued by the California Regional Water Quality Control Board (RWQCB), Santa Ana Region, and Title 22 (State of California Water Recycling Criteria) for disinfected tertiary recycled water.
The RWQCP operates as two individual plants with a final combined effluent that is discharged to the Santa Ana River. Plant 1, Membrane Bioreactors (MBR) Treatment Train, was completed in Summer 2017, with a total treatment capacity of 26 MGD. Additionally, 6 MGD of capacity of MBR and associated equipment were installed in 2021 to increase Plant 1 MBR capacity up to 32 MGD total.
Plant 2, Activated Sludge Treatment Plant, has treatment capacity of 20 MGD. Currently, the RWQCP treats 27 MGD of wastewater, in which, Plant 1 treats 22 MGD of wastewater and the remaining flow of 5 MGD is treated through Plant 2. The flow from both plants is commingled prior to Chlorine Contact Basin 2 (CCB2) where the effluent is chlorinated to meet the RWQCB’s requirements and dechlorinated prior to being discharged to the Santa Ana River.
DISCUSSION:
In May 2019, the City of Riverside received conditional approval from the State Water Resources Control Board (SWRCB), Division of Drinking Water (DDW) for conversion of CCB2 from chloramine disinfection with a residual contact time of 450 milligram-minutes per liter (mg-min/L) to free chlorine disinfection with a free chlorine residual contact time of 30 mg-min/L. The shorter contact time in the CCB2 will reduce disinfection byproducts, reduce chemical dosages, and cost, and improve overall operational efficiency. To comply with the conditions listed on the conditional acceptance letter from DDW, the modification of existing CCB2 is required for conversion to free chlorine operation.
On October 7, 2022, Bid No. 7935 was advertised on PlanetBids to construct the free chlorine modification project for CCB2 at Riverside Regional Water Quality Control Plant.
On November 17, 2022, three bids were received for the construction of the Project. The lowest responsive bid was from SCW Contracting Corp., in the amount of $1,431,185, which is 26.88% over the Engineer’s estimate. This higher bid amount correlates to inflation and supply chain issues, which affects labor and materials prices. Staff considered delaying the work and waiting for costs to decrease. It was determined that costs for labor and material may level off, but not decrease significantly to warrant the project delays.
The Purchasing Manager concurs that the recommendation to award is in compliance with Purchasing Resolution No. 23914.
STRATEGIC PLAN ALIGNMENT:
This item contributes to Strategic Priority 6 – Infrastructure, Mobility, and Connectivity and supports Goal 6.2 – Maintain, protect, and improve assets and infrastructure within the City’s built environment to ensure and enhance reliability, resiliency, sustainability, and facilitate connectivity.
Furthermore, this project aligns with each of the five Cross-Cutting Threads as follows:
Community Trust – This project ensures wastewater discharges do not negatively impact the community and environment. The RWQCP manages and protects capital assets through on-going conditional assessments and system maintenance by requiring all services and equipment to align with local laws and regulations. This project serves the public interest, benefits the City’s diverse populations, and results in greater public good.
Equity – This project supports RWQCP efforts in protecting the public’s health and the environment by ensuring critical City infrastructure and RWQCP equipment are operating efficiently and effectively.
Fiscal Responsibility – This project targets ways to reduce costs, minimize inefficiencies, and develop control methods to optimize operating processes and maintenance routines to protect City assets.
Innovation – This project exemplifies a collaborative partnership between RWQCP and the State to enhance operational reliability by achieving measurable improvements through proper rehabilitation service of wastewater treatment process.
Sustainability & Resiliency – This project supports the continuous evaluation of performance measures and practices of the RWQCP that can be managed and maintained for overall optimum performance, and to meet future needs.
FISCAL IMPACT:
The total fiscal impact of the action is $1,431,185. Funds are budgeted and available in the Sewer Fund, Chlorine Contact Basic Rehabilitation Project account number 9917923-440301. The estimated total Project cost including construction, contingencies, construction engineering support, inspection and WQCP support is itemized in Table 1.
Table 1 - Project Costs
Task
Amount
Construction Contract
$1,431,185
Construction Contingencies
$143,118
Construction Engineering Support During Construction, Contract Administration, Inspection and Reports to State Board (Carollo Engineers, Inc.) $336,988
WQCP Support (Startup and SCADA Integration)
$88,709
Total
$2,000,000
Prepared by: Gilbert Hernandez, Public Works Director
Certified as to
availability of funds: Edward Enriquez, Interim Assistant City Manager/Chief Financial Officer/City Treasurer
Approved by: Kris Martinez, Assistant City Manager
Approved as to form: Phaedra A. Norton, City Attorney
Attachments:
Bid Award Recommendation
Presentation
Award Bid 7935 to SCW Contracting Corp for RWQCP CCB2 Free Chlorine Modifications ● Page 4