Under the 2015 major maintenance contract, Gresham Smith evaluated, design and provided construction-phase services for projects throughout the plant, including:
- Replacement of corroded equipment and miscellaneous large valves, gates, instrumentation, equipment control panels, etc.
- Upgrades to influent and effluent pump station variable frequency drive
- Replacement of an old chlorine scrubber system
- Electrical upgrades to the Administration Building air conditioning system
- Replacement of Gravity Belt Thickener control panels and building gas monitoring system
- Upgrades to primary and secondary clarifier drives, chlorine and sulfur dioxide safety equipment
- Replacement of building-heat hot water loop yard piping system throughout the plant that was originally constructed out of 30-year old fiberglass pipe
Under the 2020 major maintenance contract Gresham Smith completed additional projects, including:
- Rehab of the solids screening and thickening building for GBT rehab (6 tables)
- Replacement of 3 drum screens, upgrades to the ventilation and custom in-ground biofilter odor control system, and various E&IC upgrades
- Upgrades to critical pump stations throughout the plant, including the 3 MGD Lagoon B Pump Station, 6 MGD Dewatering Filtrate Pump Station, and 5 MGD Lagoon A Pump Station.
- Cleaned all anaerobic digesters and feed wells and replaced insulation on digester steel covers
In addition to the maintenance upgrades, Gresham Smith designed stormwater improvements at the Southside Wastewater Treatment Plant. The improvements include 10 tasks related to plant-wide challenges, including drainage improvements, stormwater management through pump stations, and additional miscellaneous mechanical improvements related to process/mechanical components. The improvements are intended to alleviate localized flooding and mitigate current and future stormwater flows.