DATE: 11/05/2025
TO: Honorable Mayor and City Council Members
Honorable President and Board Members
FROM: Utilities Department
2025-428
REQUEST FOR CITY COUNCIL AND
CORONA UTILITY AUTHORITY ACTION
SUBJECT:
CONSTRUCTION CONTRACT WITH GSE CONSTRUCTION COMPANY, INC. FOR
THE SIERRA DEL ORO WATER TREATMENT PLANT FLOCCULATION BASIN WOOD
BAFFLES AND MOUNTS
EXECUTIVE SUMMARY:
This staff report requests that City Council award Notice Inviting Bids 26-008AS to GSE Construction Company, Inc. for the Sierra Del Oro Water Treatment Plant Flocculation Basin Wood Baffles and Mounts Rehabilitation Operating and Maintenance Project No. 78190. The project involves replacing deteriorated baffles and mounting brackets, repairing damaged concrete, and applying corrosion protection and epoxy coating to ensure the flocculation basins operate efficiently.
RECOMMENDED ACTION:
That the City Council:
a. Adopt the Plans and Specifications for the Sierra Del Oro Water Treatment Plant Flocculation Basin Wood Baffles and Mounts Rehabilitation Project, Notice Inviting Bids 26-008AS.
b. Award Notice of Inviting Bids 26-008AS to GSE Construction Company, Inc., the lowest responsive, responsible bidder, for the total bid amount of $166,700 and waive any and all minor irregularities in the bidding documents as submitted by said bidder.
c. Approve the Construction Contract with GSE Construction Company, Inc., for the Sierra Del Oro Water Treatment Plant Flocculation Basin Wood Baffles and Mounts Rehabilitation Project in the amount of $166,700. d. Authorize the City Manager, or his designee, to negotiate and execute nonsubstantive extensions, change orders and amendments up to 10% of total contract cost or $16,670 as authorized by Corona Municipal Code 3.08.060 (H). e. Authorize an appropriation in the amount of $193,166 from the Water Utility Fund 570 to the Sierra Del Oro Water Treatment Plant Flocculation Basin Baffles and Mounts Rehabilitation Operating and Maintenance Project No. 78190.
That the Corona Utility Authority review, ratify, and to the extent necessary, direct the City Council to take the above actions
BACKGROUND & HISTORY:
The Sierra Del Oro (SDO) Water Treatment Plant (WTP), located at 2940 Wilderness Circle, is a critical facility in the treatment of imported raw water purchased from Metropolitan Water District (MWD) for the City of Corona. SDO WTP treats raw water for total suspended solids (TSS) through a multi-stage filtration and disinfection process before distribution into the City’s water system.
The flocculation basins at SDO WTP use baffles and mounting brackets to optimize water flow and improve sedimentation efficiency during the coagulation and flocculation processes. Over time, the existing wood baffles and mounting brackets have deteriorated, and sections of concrete have shown signs of structural degradation. To extend the useful life of the flocculation basins and maintain operational reliability, replacement of the baffles and brackets, structural concrete rehabilitation, application of corrosion inhibitor, and epoxy coating are necessary.
ANALYSIS:
On September 9, 2025, Notice Inviting Bids (NIB) 26-008AS was solicited following City of Corona Municipal Code (CMC) Section 3.08.90 Public projects – formal bidding procedure and purchasing policy through the City’s PlanetBids bidding portal. Project bidding was limited to the City’s pre-qualified contractors only. The City has 15 prequalified contractors to perform water treatment, water pump station, well drilling, and water system mechanical projects. On September 22, 2025, four contractors attended a mandatory job walk held at the project site. One bid was received from a pre-qualified contractor through the PlanetBids bidding service by the bid due date of October 10, 2025, from the following vendor:
The project scope includes removing and disposing of existing baffles and brackets, repairing baffle mount studs, installing new stainless-steel brackets and Fiberglass Reinforced Plastic (FRP) baffles, repairing deteriorated concrete, applying a corrosion inhibitor and epoxy coating, and completing startup and testing.
The following bid schedule prices were received from GSE Construction Company, Inc.:
ITEM
NO. ITEM DESCRIPTION UNIT ESTQTY
UNIT
PRICE
TOTAL
PRICE
1 Mobilization and Demobilization (less
than 5%)
Lump
Sum
1 $7,500 $7,500
2 Removal and disposal of existing
baffles and mounting brackets
Lump
Sum
1 $20,000 $20,000
3 Repair Existing Baffle Mount Stud Lump
Sum
1 $2,000 $2,000
4 Supply and installation of new 316
stainless steel mounting brackets,
column plates and concrete anchor
bolts
Lump
Sum
1 $91,200 $91,200
5 Supply and installation of new baffles Lump
Sum
1 $30,000 $30,000
6 Structural rehabilitation of
deteriorated concrete, including
patching and application of concrete
corrosion inhibitor
Lump
Sum
1 $10,000 $10,000
7 Epoxy coating application Lump
Sum
1 $5,000 $5,000
8 Startup and testing Lump
Sum
1 $1,000 $1,000
Total Bid $166,700
Summary of Project Costs:
Project Management Support (City Staff) $20,000
Inspection and testing (On-Call Firm) $50,000
Maintenance and General Services Agreement $166,700
10% Change Order Authority $16,670
Project Cost $253,370
Funds Available in O&M Project No. 78190 $60,204
Vendor City Bid Amount
GSE Construction Company, Inc. Livermore $166,700
Fund Appropriation Needed $193,166
City Staff recommends that City Council award NIB 26-008AS and the Construction Contract in the amount of $166,700 to GSE Construction Company, Inc., as the lowest responsive, responsible bidder for the SDO WTP Flocculation Basin Wood Baffles and Mounts Rehabilitation Project. All licenses and references for GSE Construction Company, Inc. have been viewed and verified by City Staff, and all other required documentation is in order.
FINANCIAL IMPACT:
Approval of the recommended actions will result in an appropriation in the amount of $193,166 from the Water Utility Fund 570 to the Sierra Del Oro Water Treatment Plant Flocculation Basin Baffles and Mounts Rehabilitation Operating and Maintenance Project No. 78190. There is sufficient working capital for the recommended actions.
Fund Project
No.
Requested
Appropriation
FY 2026
Current
Balance
Project Balance*
570 78190 $193,166 $60,204 $253,370
*Upon Council Approval
ENVIRONMENTAL ANALYSIS:
This action is categorically exempt pursuant to Section 15302 (c) of the Guidelines for the California Environmental Quality Action (CEQA), which states that “operation, repair, maintenance, permitting, leasing, licensing, or minor alteration of existing public or private structures, facilities, mechanical equipment, or topographical features, involving negligible or no expansion of use beyond that existing at the time of the CEQA determination” and is therefore exempt from CEQA. This action involves repairs to existing infrastructure to maintain public health and safety. Therefore, the action is exempt from the requirements of CEQA, and no environmental analysis is required.
PREPARED BY: ERIN KUNKLE, MAINTENANCE MANAGER
REVIEWED BY: TOM MOODY, UTILITIES DIRECTOR
ATTACHMENT:
1. Exhibit 1 – GSE Construction Contract