FY 23–FY 24 Miscellaneous Sewer Repair
This project includes miscellaneous pipe repairs, manhole repairs, water line installations, force main repairs, pavement removal and replacement, backfilling and other miscellaneous related work throughout UCSD’s service area. The work is assigned on an as-needed basis throughout the year. The project was awarded to SNC Construction at the August 2022 Board Meeting. Recent work under this contract included replacing several panels of concrete pavement in the Northeast Plant’s entrance driveway.
Link to FY23-24 Misc Sewer Repair Project Photos
Crystal Lake Park Interceptor Crossing
The project consists of installation of a new, prefabricated pedestrian bridge on pile supported concrete abutments, gravity sanitary sewer piping, fiberglass manholes, and landscaping. The existing interceptor crossing including the vault structures will be demolished and removed after new interceptor crossing is operational. The new pedestrian bridge will be a prefabricated weathered steel modified bowstring design with an 8-foot wide concrete shared-use path across it for pedestrians and bicyclists. The new bridge will support two 18-inch diameter Hobas interceptor sewer pipes hanging underneath it. Bypass pumping will be required during the connection of the new interceptor crossing to the existing sewer pipes.
The Board authorized awarding the CLP Interceptor Crossing to Stark Construction at its September 2022 meeting for $1,230,500. Construction of the new bridge abutments are anticipated to start in July 2023 and run thru the middle of August 2023. The new bridge structure is anticipated to arrive in late August with the project being completed before the end of September 2023.
Link to Crystal Lake Park Interceptor Crossing Photos
Rebecca Drive Interceptor Sewer Protection
The UCSD V-C interceptor runs under an unnamed tributary near Ivanhoe Estates, Urbana, Illinois. Both the tributary and interceptor begin north of I-74, cross under the interstate and flow south through a park on the east side of Ivanhoe Estates. The interceptor parallels and crosses the tributary several times. The interceptor pipe is currently exposed at two crossing locations and along the bank of the tributary. The UCSD V-G interceptor feeding into the V-C interceptor is also exposed downstream of the footbridge in the park along the same unnamed tributary.
This project will protect the sanitary interceptor pipes against future erosion and scour so that the infrastructure will remain intact. In-stream structures to direct streamflow away from the pipe and armoring material to protect the pipe will be utilized for enduring protection.
The Board authorized awarding the Rebecca Drive Interceptor Sewer Protection to SNC Construction at its July 2023 meeting for $408,000.
Link to Rebecca Drive Interceptor Sewer Protection Photos
Boneyard Creek Interceptor Sewer Protection
UCSD 1923’s interceptor sewer is located along the north bank of the Boneyard Creek just east of the Race Street Bridge. The creek bank in Segment #3 of the Boneyard Creek between Race Street and Broadway Avenue has eroded away exposing the District’s 1923 Interceptor sewer pipe just upstream of the aerial crossing structure. UCSD was concerned that additional bank erosion would undermine the sewer pipe potentially leading to it collapsing into the creek.
UCSD learned that the City of Urbana was planning a Bank Stabilization Project in the Summer of 2023 for Segment #3 of the Boneyard Creek. The City’s project includes installing rip-rap armoring, boulders, rock, and j-hooks to restore and stabilize the creek bank protecting it against future erosion. City Engineering Staff offered to include bank stabilization for the area around the 1923 interceptor sewer as part of their project. UCSD and the City of Urbana executed an Intergovernmental Agreement for a joint stream bank protection project at the May 2023 Board Meeting. The City of Urbana is leading the project and awarded the project to SNC Construction for $258,204.68. UCSD’s share of the project cost is $90,518.26.
Link to Boneyard Creek Interceptor Sewer Protection Photos
FY 24 Pump Station Cathodic Protection Systems
UCSD operates and maintains fourteen steel construction pump stations as part of the sanitary sewer collection system. Five of the pump stations have impressed current cathodic protection systems. Eight of the pump stations have galvanic (sacrificial) cathodic protection systems. Testing revealed that the galvanic cathodic protection systems were not functioning properly at six of the eight pump stations. The galvanic cathodic protection systems were installed between 2010 and 2013 and have reached the end of their service life. One of the pump stations does not have a cathodic protection system.
The impressed current systems are slightly more expensive than the passive systems and require more operation and maintenance activity. However, the impressed current systems will produce enough potential difference to fully meet the National Association of Corrosion Engineers recommended criteria for full cathodic protection.
UCSD prepared a Request for Proposals (RFP) for replacement and installation of impressed current cathodic protection systems for the nine District owned pump stations (8 galvanic and 1 missing system stations). The Board authorized awarding the FY 24 Pump Station Cathodic Protection Systems project to Johnson Creek at its July 2023 meeting for $259,200.
Link to FY 24 Pump Station Cathodic Protection Systems Photos
Northeast Plant Station S Roof Replacement
The roof at the Station S (Nitrification Building) at the Northeast Plant (NEP) started leaking in late 2022. Bailey Edward, the District’s architectural consultant, inspected the roof and observed that the roof is in poor condition. Bailey Edward noted that the roof is beyond its useful life and the District should replace the roof system as soon as practicable. The estimated cost of the roof replacement is $250,000 and the work is anticipated to occur during the Summer thru Fall of 2024.
2023 Improvements Project
The Southwest Plant (SWP) improvements include the following:
• Improve ventilation system
• Add a bypass on the grit pump suction with a manual valve
• Enclose wet well loading area
• Replace existing perforated plate of the screens
• Repaint grit pipes
• Replace grit pump piping
NN1 and NN2
• Replace flow meter
• Add water cannons
• Eliminate gaps under sweeps
• Repair cracked slab and wall
• Demolish old influent structure
• Demolish Station AA1
• Repaint NN1 and NN2 (overcoat)
GG1, GG2, and G
• Construct new primary clarifiers with mechanisms
• Add new primary sludge pumps and primary scum pumps
• Add new piping from headworks to primary clarifiers with primary system bypass option
• Add new piping from primary clarifiers to aeration basins with primary sludge feed to aeration
• Demolish Station M and relocate electrical equipment
• Replace and right-size the non-potable water system
• Replace RAS pumps and piping
• Replace cracked floor drain piping in basement
• Remove and replace chemical storage and chemical feed systems
• Add continuous ventilation to Station C
CC1 - CC7
• Replace aeration piping and diffusers with new 12” membrane diffusers and new aerationpiping
• Replace all exterior fiberglass grating with SS or aluminum grating
Repair damaged concrete, including spalling and cracks
• Replace handrails
• Remove electrical equipment in Station K and replace deteriorated electrical conduits along CC1-CC7
HH1 – HH5
• Replace scum removal mechanism on HH5
• Replace existing stop logs with new downward opening gates with manual actuators
• Repaint HH5 (overcoat)
Station S, SS1, and SS2
• Demolish nitrification towers and remove media
• New filter pumps, drive, actuators, and valves
• Replace piping to the gravity belt thickeners (GBTs)
• Replace discharge piping of TWAS pumps from GBTs to Station YY
• Potable water feed with wash sink
• New HVAC for dehumidification only for the MCC Room
• Add odor control system
• Modify sludge loading and mixing system which transfers TWAS to tanker trucks
• Replace existing steel sludge storage tank with new concrete tank
• Resurface asphalt pavement in selected locations
• Install new storm inlet and storm sewer that outlets into existing culvert along Rising Road
• Replace exterior fiberglass grating with new aluminum grating in selected locations
• Replace existing lead painted steel handrail with new aluminum handrail in selected locations
The Northeast (NEP) improvements include the following:
Anaerobic Digestion Improvements
• New biogas conditioning system
• Replace existing CHP engines with new CHP engines
• Replace existing digester gas ductile iron piping and gas safety equipment in the digester gas complex
• Replace existing gas cannon gas mixing system in digesters EE-1, EE-2, and EE-3 with Vaughn
chopper pumps and Rotamix system for digester mixing
• Replace floor grating in the digester complex tunnels
The 2023 Improvements Project has an estimated cost of $24,000,000 and is anticipated to be advertised to bid in September 2023. The project is anticipated to be completed in January 2026.