Expenditure Category Corona HGSD JCSD Norco Western Total Operations:
Treatment System 1,844,323 $ 621,984 $ 5,181,896 $ 2,059,340 $ 1,124,510 $ 10,832,053 $ Conveyance System 140,520 45,549 - 147,116 96,939 430,124 General & Administration 305,392 87,421 699,372 314,717 224,965 1,631,867 Total Operating Contributions $ 754,954 2,290,235 $ 5,881,268 $ 2,521,173 $ 1,446,414 $ 12,894,044 $ Debt Service:
SRF Loan 1,903,189 $ 70,887 $ 2,064,704 $ 408,275 $ 39,481 $ 4,486,536 $ Capital:
Pay-go Capital Improvement Projects (1) $ 292,224 1,020,851 $ 2,177,352 $ 1,046,699 $ 757,374 $ 5,294,500 $ Asset Replacement Reserve Funding 306,878 87,847 463,992 308,296 234,025 1,401,038 Total Capital Contributions $ 380,071 1,327,729 $ 2,641,344 $ 1,354,995 $ 991,399 $ 6,695,538 $ Total Member Contributions $ 1,205,912 5,521,153 $ 10,587,316 $ 4,284,443 $ 2,477,294 $ 24,076,118 $ Expenditure Category Corona HGSD JCSD Norco Western Total Operations:
Treatment System 1,459,804 $ 629,070 $ 5,078,223 $ 2,071,560 $ 1,064,495 $ 10,303,152 $ Conveyance System 118,149 44,377 - 143,576 93,022 399,124 General & Administration 261,952 74,986 599,890 269,951 192,965 1,399,744 Total Operating Contributions $ 748,433 1,839,905 $ 5,678,113 $ 2,485,087 $ 1,350,482 $ 12,102,020 $ Debt Service:
SRF Loan 1,903,189 $ 70,887 $ 2,064,704 $ 408,275 $ 39,481 $ 4,486,536 $ Capital:
Pay-go Capital Improvement Projects 936,356 $ 268,038 $ 1,983,850 $ 959,624 $ 695,132 $ 4,843,000 $ Asset Replacement Reserve Funding 156,087 44,681 301,940 159,007 116,833 778,548 Total Capital Contributions $ 312,719 1,092,443 $ 2,285,790 $ 1,118,631 $ 811,965 $ 5,621,548 $ Total Member Contributions $ 1,132,039 4,835,537 $ 10,028,607 $ 4,011,993 $ 2,201,928 $ 22,210,104 $ Total Member Contribution YTY Change $ 73,873 685,616 $ 558,709 $ 272,450 $ 275,366 $ 1,866,014 $ (1) $1.8M is carried over from FY23-24 Budget
*** This proposed budget does not include any capital contribution projection for the Recycled Water project led by JCSD.
Adopted Fiscal Year 2023-2024 Budget
WRCRWA Budget Schedule
Fiscal Year 2024-2025
Member Contribution Summary Year-to-Year Comparison
Proposed Fiscal Year 2024-2025 Budget
Capacity Contribution Capacity Contribution Capacity Contribution Total by Agency Corona 2.62 907,847 $ 2.62 87,503 $ 2.62 305,392 $ 1,300,742 $ HGSD 0.75 259,880 $ 0.75 25,049 $ 0.75 87,421 $ 372,350 $ JCSD 6.00 2,079,038 $ - - $ 6.00 699,372 $ 2,778,410 $ Norco 2.70 935,568 $ 2.50 83,496 $ 2.70 314,717 $ 1,333,781 $ WMWD 1.93 668,758 $ 2.13 71,138 $ 1.93 224,965 $ 964,861 $ Total 14.00 4,851,091 $ 8.00 267,186 $ 14.00 1,631,867 $ 6,750,144 $ Est. Flows Rate Est. Flows Rate Est. Flows Rate Total by Agency Corona 1.50 936,476 $ 1.50 53,017 $ - - $ 989,493 $
HGSD 0.58 362,104 $ 0.58 20,500 $ - - $ 382,604 $
JCSD 4.97 3,102,858 $ - - $ - - $ 3,102,858 $
Norco 1.80 1,123,772 $ 1.80 63,620 $ - - $ 1,187,392 $
WMWD 0.73 455,752 $ 0.73 25,801 $ - - $ 481,553 $
Total 9.58 5,980,962 $ 4.61 162,938 $ - - $ 6,143,900 $ Grand Totals 10,832,053 $ 430,124 $ 1,631,867 $ 12,894,044 $ Treatment System Conveyance System General & Administrative WRCRWA Budget Schedule
Fiscal Year 2024-2025
Capacity, Rates, and Contributions
Fixed and Variable
Fixed Rate per MGD:
$28,876 $2,783 $9,713
Variable Rate per MGD:
$1,710 $97 $0
2023-2024 2024-2025
Budget Budget Amount % Change
Treatment System
Treatment Plant
Labor Costs 3,027,154 3,422,603 395,449 13.1%
Outside Services (Laboratory) 182,555 189,857 7,302 4.0% Facility Maintenance 1,372,088 1,557,268 185,180 13.5%
Vehicles/Equipment Rental 151,358 171,130 19,772 13.1%
Utilities 2,167,155 2,462,936 295,781 13.6%
Chemicals 2,610,145 2,110,145 (500,000) -19.2%
Solids Disposal/Sludge 415,272 456,799 41,527 10.0%
Permits and Fees 158,075 154,302 (3,773) -2.4%
Facility Maintenance - Bldg & Yard 59,076 71,702 12,626 21.4% Supplies 109,824 172,448 62,624 57.0%
Total Treatment Plant 10,769,190 10,252,702 516,488 5.0% Pre-treatment
Labor Costs 42,638 54,282 11,644 27.3%
Vehicle/Equipment Rental 2,132 2,714 582 27.3%
Laboratory - Quality Testing 4,680 4,867 187 4.0%
Supplies 1,000 1,000 - 0.0%
Total Pre-treatment 62,863 50,450 12,413 24.6%
Total Treatment System 10,832,053 10,303,152 528,901 5.1% Conveyance System
Labor Costs 208,369 211,702 3,333 1.6%
Facility Maintenance 74,600 79,564 4,964 6.7%
Vehicle/Equipment Rental 10,418 10,585 167 1.6%
Utilities 90,620 113,156 22,536 24.9%
Facility Maintenance - Bldg & Yard 5,117 5,117 - 0.0%
Misc. Supplies/Operating Expenses 10,000 10,000 - 0.0%
Total Conveyance System 430,124 399,124 31,000 7.8%
General and Administration
Labor 504,080 531,578 27,498 5.5%
Outside Services (Consulting) 384,620 531,123 146,503 38.1% Insurance Expense 303,000 389,000 86,000 28.4%
Audit Expense 20,600 21,500 900 4.4%
Mercury Monitoring - SARDA 8,320 8,653 333 4.0%
Basin Monitoring Program 26,000 30,234 4,234 16.3%
Vehicle/Equipment Rental 25,204 26,579 1,375 5.5%
Bank Charges 5,540 5,540 - 0.0%
Permits and Fees 15,880 18,500 2,620 100.0%
General Supplies 11,500 11,960 460 4.0%
Legal Costs - General 95,000 57,200 (37,800) -39.8%
Total General and Administration 1,631,867 1,399,744 232,123 16.6% Total Operating Expenses 12,894,044 12,102,020 792,024 6.5% WRCRWA Budget Schedule
Fiscal Year 2024-2025
Year-to-Year Comparison
Change
Beginning Outstanding
SRF Loan Due Date
Member Agency
Allocation
Percentage
Balance
7-01-2024 Interest Principal Payment
Balance
6-30-2025
Plant Expansion 12/31/2024 Corona 42.420% 23,203,464 $ 440,866 $ 1,462,323 $ 1,903,189 $ 21,741,141 $ HGSD 1.580% 864,250 16,421 54,466 70,887 809,784JCSD 46.020% 25,172,640 478,280 1,586,424 2,064,704 23,586,216Norco 9.100% 4,977,641 94,575 313,700 408,275 4,663,941Western 0.880% 481,354 9,145 30,336 39,481 451,018 100.000% 54,699,349 $ 1,039,287 $ 3,447,249 $ 4,486,536 $ 51,252,100 $ SRF Loan maturity date: 12/31/2036
WRCRWA Budget Schedul
e
Fiscal Year 2024-2025
Debt Service Expenditures
Debt Service
Description
Pay-go Capital Improvement Projects Total Corona HGSD JCSD Norco Western Treatment System
Solar Dryer Discharge Conveyor 1,292,000 241,785 69,212 553,713 249,175 178,115 Processed Non-potable Water Pump Improvements 337,000 63,066 18,053 144,428 64,994 46,459 Digester Rehabilitation 900,000 168,426 48,213 385,713 173,574 124,074 Diffuser Grid Addition/Modification 95,000 17,778 5,089 40,714 18,322 13,097 Bioreactor Modeling 40,000 7,486 2,143 17,143 7,714 5,514 Blower Building Air Intake/Ventilation Modifications 371,000 69,429 19,874 159,000 71,551 51,146 Blower Replacement 1,500,000 280,710 80,355 642,855 289,290 206,790 Electrical Load Study 40,000 7,486 2,143 17,143 7,714 5,514 Medium Voltage Switchgear 190,000 35,557 10,178 81,429 36,643 26,193 Dewatering Replacement 315,500 59,043 16,901 135,214 60,847 43,495 Total Treatment System 5,080,500 950,766 272,161 2,177,352 979,824 700,397 Conveyance System
South Regional Pump Station (SRPS) Emergency Pump 214,000 70,085 20,063 - 66,875 56,977 Total Conveyance System 214,000 70,085 20,063 - 66,875 56,977 Total Pay-go Capital Improvement Project Contribution 5,294,500 1,020,851 292,224 2,177,352 1,046,699 757,374 Asset Replacement Reserve Funding Total Corona HGSD JCSD Norco WMWD Treatment System 1,082,654 202,608 57,998 463,992 208,801 149,255 Conveyance System 318,384 104,270 29,849 - 99,495 84,770 Total Asset Replacement Reserve Contribution 1,401,038 306,878 87,847 463,992 308,296 234,025 Total Capital Contributions $ 6,695,538 $ 1,327,729 $ 380,071 $ 2,641,344 $ 1,354,995 $ 991,399 WRCRWA Budget Schedule
Fiscal Year 2024-2025
Capital Budget
Agency Amounts to be Contributed
WRCRWA Pay-go Capital Improvement Projects Fiscal Year 2024-2025 Introduction
The WRCRWA Administrator is recommending approval and implementation of the following pay-go capital improvement projects for Fiscal Year 2024-2025.
1. Solar Dryer Discharge Conveyor
2. SRPS Emergency Pump
3. Processed Non-potable Water Pump Improvements
4. Digester Rehabilitation
5. Diffuser Grid Addition/Modification
6. Bioreactor Modeling
7. Blower Building Air Intake/Ventilation Modifications
8. Blower Replacement
9. Electrical Load Study
10. Medium Voltage Switchgear
11. Dewatering Replacement
The capital projects are critical to the successful operation of the WRCRWA Wastewater Treatment Plant. The projects are described on the following pages.
WRCRWA Pay-go Capital Improvement Projects
Fiscal Year 2024-2025 Budget
Capital Project No. 1: Solar Dryer Discharge Conveyor
Allocation Treatment
Estimated Total Cost: $1,792,000
Budget Carryover from Fiscal Year 2023-2024 $1,292,000
Summary
The Solar Dryer Conveyor project consists of the replacement of four conveyors at the “dry end” of the Solar Dryer and modifying the discharge chute. These conveyors transfer the processed sludge from the solar drier into the sludge loadout building where they are discharged into semitrailers for offsite disposal.
Justification
This system is a single point of potential failure and needs to be fortified. During times of wetter solids, the current system conveys the wet solids to the end without much drying.
Background
The project consists of replacement of four conveyors at the “dry end” of the Solar Dryer. The conveyors on the “dry end” of the dryer that feed the truck loadout facility were sized for dryer solids. The solar dryer feed conveyors have sufficient capacity (provided the sludge is fairly dry, >50%). However, if dewatering equipment produces wetter solids, if a solar dryer bay is offline, or in periods of colder weather, wet solids could be conveyed from the wet end to the dry end without much drying occurring. Due to this potential, these conveyors should be replaced to allow for similar capacities as the “wet” feed conveyors. Also, the discharge chute at the end of the solar dryer needs to be modified to prevent solids bridging at times of the year.
It is recommended that with the replacement of the conveyance system, the chute should be modified to be wider and reduce the potential for “bridging” of solids above the conveyor.
Additionally, it is recommended to have spare motors and parts to keep this system running.
Schedule
Projected completion date for this project is by the end of Fiscal Year 2024-2025.
WRCRWA Pay-go Capital Improvement Projects
Fiscal Year 2024-2025 Budget
Capital Project No. 2: South Regional Pump Station (SRPS) Emergency Pump Allocation: Conveyance
Estimated Total Cost: $1,000,000
Budget Carryover from Fiscal Year 2023-2024 $214,000
Summary
Design, purchase, and installation of a standalone diesel bypass pump at the SRPS.
Justification
Currently there is no back up power at the SRPS. By design, in the event of a power outage, the wet well fills and if power is not restored quickly, raw sewage overflows into the Inland Empire Brine Line (Brine Line). Numerous improvements and upgrades have been implemented at the SRPS and WRCRWA Treatment Plant since 2016 to increase the overall system redundancy and reliability. The goal of the improvements/upgrades are to prevent future sewage overflow into the Brine Line located adjacent to the SRPS. Installation of a standalone diesel bypass pump will provide additional redundancy and reliability to the sewage collection system. The pump will also allow WRCRWA to maintain independent hydraulic control in the event of mechanical and/or electrical equipment failures at SRPS allowing the SRPS to continue to pump flows to the WRCRWA Treatment Plant rather than discharging them to the Brine Line.
Background
The SRPS serves the City of Riverside, Home Gardens, City of Norco, and City of Corona by pumping wastewater from these cities just over three miles to the WRCRWA Treatment Plant.
Average daily pumping flow is 3 MGD.
Orange County Sanitation recently objected to un-planned and unnoticed sewage flows in the Brine Line and added a requirement to the Santa Ana Watershed Project Authority’s (SAWPA) discharge permit that required development of a plan to incorporate robust redundancies to prevent discharges to the Brine Line. Installation of the standalone diesel bypass pump will comply with this requirement should it be added to WRCRWA’s permit from SAWPA.
The WRCRWA Treatment Plant was designed to rely on the Brine Line and ultimately Orange County Sanitation District as a back-up if there were problems that WRCRWA’s system could not handle. This option provides for redundancy against failure not only due to electrical but also due to mechanical issues. It also provides an added advantage over the generator only option that was considered last year as it is a more efficient option.
Schedule
The project has been selected to receive a Cal OES Hazard Mitigation Assistance grant. Orange County Sanitation District and SAWPA have acknowledged the proposed plan. Work is slated to begin in late spring/early summer 2023 with completion expected in Fall 2025.
WRCRWA Pay-go Capital Improvement Projects
Fiscal Year 2024-2025 Budget
Capital Project No. 3: Processed Non-potable Water Pump Improvements Allocation: Treatment
Estimated Total Cost: $337,000
Budget Carryover from Fiscal Year 2023-2024 $337,000
Summary
Replacement of processed non-potable water pumps and suction piping at the WRCRWA Treatment Plant.
Justification
Pumps for the processed non-potable water system have experienced degradation. The condition of the existing screen on the suction piping is unknown but based on material being in the pipe it appears the screen is not functional or the DIP pipe lining is falling apart and this is the material that is ending up in the pump. The suction pipe condition needs to be verified. Once the suction pipe condition is verified and resolved, new pumps should be purchased to replace the damaged units.
Background
It is speculated the degradation could be from a low suction head or even potentially chlorination being too high. The local representative for Grundfos visited the site and has been provided information regarding the installation and access to the existing pumps. Upon review of the pumps, it was noted that there is debris in the pumps and also in the suction piping. It is believed that this debris has caused the issues to the pumps by damaging the pump vanes.
Schedule
Projected completion date for this project is by the end of Fiscal Year 2024-2025.
WRCRWA Pay-go Capital Improvement Projects
Fiscal Year 2024-2025 Budget
Capital Project No. 4: Digester Rehabilitation
Allocation: Treatment
Estimated Total Cost: $1,800,000
Budget Carryover from Fiscal Year 2023-2024 $0
Summary
Cleaning, inspection, and repair of any damaged or degraded coatings.
Justification
With both Digesters #1 and #2 having flat bottoms (prone to solids accumulation) and being in service for seven years, are now due to be taken offline (one at a time) for cleaning, inspection, and repair of any degraded or damaged coatings. Cleaning of Digesters #1 and #2 had been contingent on Digester #3 being built and brought online.
Background
Digesters #1 and #2 were converted from aerobic digesters to anaerobic digesters during the plant expansion. They were placed in-service as anaerobic digesters in early 2017. Over the past seven years, they have been continuously fed both primary sludge and thickened waste activated sludge (TWAS), which contains debris not broken down in the digestion process or removed during daily dewatering activities (grit and debris). This debris reduces the overall biological capacity of each digester as well as settled debris eventually negatively impact equipment operation. During recent months, the centrifuges have experienced several failures.
Staff surmise the failures resulted from settled debris being sucked into the centrifuges as the centrifuge feed line is located 18” off the digester floor. For overall digester health and protection of downstream equipment, both digesters #1 and #2 should be taken offline (one at a time for cleaning, inspection, and repair of anything discovered.
During Fiscal Year 2024-2025 staff are requesting $900,000 for Digester #1 cleaning. In Fiscal Year 2025-2026, there will be another $900,000 needed for Digester #2.
Schedule
This project is planned to kick off in September 2024. This project will span two fiscal years and should conclude in Fiscal Year 2025-2026.
WRCRWA Pay-go Capital Improvement Projects
Fiscal Year 2024-2025 Budget
Capital Project No. 5 & 6: Diffuser Grid Addition/Modification (Including Modeling) Allocation: Treatment
Estimated Total Cost: $1,606,000
Budget Carryover from Fiscal Year 2023-2024 $0
Summary
Improve the performance of Bio-reactor #1 by adding additional aeration capacity (Diffuser Grids).
Justification
Bio-reactor #1 has limited aeration capacity which can be overwhelmed during higher flows. By adding additional aeration capacity in other areas of the bio-reactor, WRCRWA will have increased treatment capacity and better redundancy. This increased aeration capacity will help stabilize treatment and reduce the likelihood of ammonia “bleed-through”.
Background
Currently air diffusers are installed in 2 of the four passes with the aerator in the middle of these passes. This leaves 50% of the aerobic portion of the bioreactor. At times the plant experiences ammonia break through to the tertiary filters, which is believed to be associated with the short aerobic HRT and SRT. Again, this occurs because only 50% of the aerobic section of the bioreactor is under aeration.
Initially, it is proposed to add additional diffuser grids to BR1. Fourteen (14) additional grids could be added. Nine (9) would be placed in pass 2, all to the south of the existing walkway and then five (5) would be placed in pass 1. Two (2) would be placed to the north of the walkway and the remaining three (3) would be placed south of the walkway. An additional pipe header will be added to extend to passes 1 and 2 and provide air to the diffusers. Walkways will be added to provide access to the new diffuser grids in these passes. Modeling is needed to verify the proposed approach.
During Fiscal Year 2024-2025 the ask is for $135,000.
Schedule
This project is planned to kick off in September 2024. The first set of tasks would be modeling of the proposed changes and design, with installation in the subsequent year. This project will span two fiscal years and should conclude in Fiscal Year 2025-2026.
WRCRWA Pay-go Capital Improvement Projects
Fiscal Year 2024-2025 Budget
Capital Project No. 7: Blower Building Air Intake/Ventilation Modifications Allocation: Treatment
Estimated Total Cost: $371,000
Budget Carryover from Fiscal Year 2023-2024 $0
Summary
Improve air exchanges in the blower building for blower operations.
Justification
The current blower building has limited ventilation filtration and no temperature controls.
During summer months blowers fail due to increase heat. To mitigate the heat, doors and windows are opened (to reduce heat), but dust is then introduced resulting in bearing failures.
Both heat and dust are to be addressed through this project.
Background
The blower building currently has no forced ventilation. As such, air is pulled into the room via the suction of the blowers that are in operation. The blower room has louvers with filters, but during warmer temperature periods, the room gets too hot for blower operation. To resolve this issue, the garage door is opened to cool the room. Opening this door, however, causes dust to enter the room which is causing operation issues with the blowers. It is recommended that a climate control system be installed to keep temperatures and dust in an acceptable range for blower operation.
This can be accomplished with a twofold approach as follows:
1. A combined intake plenum system should be incorporated to provide direct air feed to each of the blowers. This will be done by adding a plenum intake structure to the north of the building, including inlet filters. All blower intake air will pass through this structure and then ducting will be provided into the room to direct pre-filtered air to each of the blowers.
2. With the intake blower air separated from the room ventilation, either a cooling system using air conditioning or evaporative cooling can be used for the air in the room.
Thus, the blowers will have sufficient filtered air flow to each unit and the room will be cooled sufficiently to keep the electronics and motors cool enough to allow for normal and consistent operations.
Schedule
This project is planned to kick off in July 2024. It will run in concert with the Blower replacement project as they are interconnected.
WRCRWA Pay-go Capital Improvement Projects
Fiscal Year 2024-2025 Budget
Capital Project No. 8: Blower Replacement
Allocation: Treatment
Estimated Total Cost: $1,500,000
Budget Carryover from Fiscal Year 2023-2024 $0
Summary
Replace three turbo blowers associated with the activated sludge process.
Justification
Over the past few years, WRCRWA has experienced failures of the existing HIS Turbo Blowers.
During the most recent failure we were made aware that HSI equipment is no longer supported, and replacement parts are non-existent.
Background
WRCRWA is currently equipped with five turbo blowers that support the aerobic biological process. These five blowers vary in age and manufacturer. In 2012 (or so), WRCRWA supplemented its aeration capacity within the oxidation ditch by adding diffuser grids and three turbo blowers. Those original three turbo blowers were manufactured by Houston Service Industries (HSI). HSI was subsequently purchased by Atlas Copco. During the 2017 plant expansion and addition of another biological reactor, two more turbo blowers were installed.
These two “newer” turbo blowers were manufactured by APG-Neuros.
Over the past few years, WRCRWA has experienced failures of the HSI blowers (typically related to the air bearings and dust). In 2023, HSI blower #2 experienced an electrical component failure and subsequent mechanical failure. Through this failure and attempted repair, Atlas Copco has notified WRCRWA that the HSI product line is no longer supported and that replacement parts are non-existent. Atlas Copco manufactures a similar product and as they replace existing HSI blowers, those used units and being scavenged for parts to make repairs on other HSI blowers.
WRCRWA is now faced with needing to replace the three HSI blowers (before failure) to ensure availability of adequate air in support of the biological processes. It is in WRCRWA’s best interest to investigate all blower technologies to ensure integration with the remaining two APG-Neuros blowers along with efficiency and ultimate biological air demands.
Schedule
This project is planned to kick off in July 2024. This project may span two fiscal years depending on equipment considerations and availability of replacement equipment.
WRCRWA Pay-go Capital Improvement Projects
Fiscal Year 2024-2025 Budget
Capital Project No. 9: Electrical Load Study
Allocation: Treatment
Estimated Total Cost: $40,000
Budget Carryover from Fiscal Year 2023-2024 $0
Summary
Conduct a 12-month electrical load study to better understand capacity within the existing low voltage gear.
Justification
Before proceeding with upgrades throughout the treatment plant (blower and dewatering upgrades), it is critical to understand the existing capacities and limitations of the existing electrical equipment.
Background
This existing gear is at or near capacity, however a 12-month load study could be performed to determine if some additional capacity is available. Otherwise, to gain additional capacity, additional MCC line-ups would be required and would have to be fed directly from the medium voltage switchgear.
Schedule
This project is planned to kick off in July 2024.
WRCRWA Pay-go Capital Improvement Projects
Fiscal Year 2024-2025 Budget
Capital Project No. 10: Medium Voltage Switchgear
Allocation: Treatment
Estimated Total Cost: $3,138,000
Budget Carryover from Fiscal Year 2023-2024 $0
Summary
Replace the medium voltage switchgear and place it in the existing electrical building.
Justification
The existing outdoor medium voltage switchgear is 26 years old and is becoming obsolete. It is due for replacement and should be relocated inside the newly built Electrical Building to provide a better environment conducive to such equipment.
Background
Due to the age of the gear and it being installed outdoors, it is recommended that this equipment be replaced to ensure it can be maintained and operated properly in the foreseeable future. A new electrical building has been constructed and the low voltage switchgear was moved into this building. There is room for a new medium voltage switchgear to be installed in this building also.
Depending on the outcome of the blower investigation, dewatering replacement study and low voltage load study, the medium voltage system might be impacted. The request would be for $190,000 during Fiscal Year 2024-2025 with replacement being in Fiscal Year 2026-2027.
Depending on outcome of all studies, this could remain in Fiscal Year 2026-2027 or might need to shift into Fiscal Year 2025-2026.
Schedule
This project is planned to kick off in July 2024.
WRCRWA Pay-go Capital Improvement Projects
Fiscal Year 2024-2025 Budget
Capital Project No. 11: Dewatering Equipment Replacement Allocation: Treatment
Estimated Total Cost: $4,378,000
Budget Carryover from Fiscal Year 2023-2024 $0
Summary
Replace the three existing Andritz centrifuges.
Justification
Dewatering sludge is a critical component of biosolids management. Over the past few years, the Centrifuges at WRCRWA have experienced numerous failures resulting in decreased operating cycles. Limited dewatering capacity jeopardizes the treatment plant’s ability to maintain regulatory compliance.
Background
During the later stages of the plant expansion design, it was surfaced that the original centrifuges were outdated and no longer serviceable. The design team sought replacement equipment that would meet the needs of the facility while also fitting within the existing footprint of the original equipment. Andritz centrifuges were selected and installed during the plant expansion.
While the existing Andritz centrifuges have met the needs of the facility, they are being pushed to their limits. The centrifuges are being ran at the far end of their speed rating to achieve decent % solids concentration while maintaining desirable centrate quality. The units are being stressed resulting in reduced component life and increasingly sever failures.
With the units suffering a higher rate of mechanical breakdown, very rarely do we have three units available. This has resulted in increased run times for the other two units available. An investigation of best available technologies and based on current WRCRWA sludge conditions, staff recommend replacing the existing centrifuges to gain greater operational redundancy and productivity.
During Fiscal Year 2024-2025 the ask is for $315,000.
Schedule
This project is planned to kick off in July 2024.