Date
Tuesday, July 29, 2025
Time
11:00 AM - 11:30 AM
Location Name
Room 301E
Name
Excellence Beyond Compliance: An Update of Hamilton County's Consent Decree
Track
Rehabilitation - CW
Description
The Hamilton County Water and Wastewater Treatment Authority (WWTA) entered into a federal Consent Decree on July 16, 2024 after 9 plus years of intense negotiations with the United States Environmental Protection Agency (EPA), Tennessee Department of Environment and Conservation (TDEC), the Tennessee Attorney General’s Office and multiple other governments and non-government parties. The purpose of the Consent Decree is to reduce sanitary sewer overflows (SSOs) in the collection system and illicit bypasses at the Signal Mountain Wastewater Treatment Plan (WWTP). This presentation will provide the conclusion of the lengthy negotiations and an update of the WWTA’s progress to comply with the requirements of its Consent Decree. Specific elements of the WWTA Consent Decree will be discussed, including efforts by the WWTA and its Program Manager to reduce chronic SSOs and innovative solutions to comply with the Consent Decree requirements and assure sewer capacity for projected growth in the region. The first major plan implemented was the Signal Mountain Remediation Plan, which included a pilot study and recommendation to address illicit bypasses at the Signal Mountain WWTP. This recommendation includes a “first-of-its-kind” advanced primary treatment system using cloth media filtration technology. Other unique elements of the WWTA Consent Decree will be discussed, including the strategic focus of early action rehabilitation projects to reduce SSOs and assure capacity in collection system. Results from the early action rehabilitation projects will be provided, which ranged from 30% to 60% removal of inflow/infiltration (I/I). This presentation will summarize the unique rehabilitation approach for each project to achieve the early success. The WWTA also saw the need to improve its data management for work order history. Therefore, the WWTA decided to cancel the subscription for its previous work order software and create a new system customized for the WWTA’s staff and its specific needs. The WWTA’s Program Manager stepped in and utilized ArcGIS to develop custom work order forms for field operations staff and dashboards for the engineers and office staff. These tools will allow the WWTA to easily capture and summarize work order history moving forward to make strategic decisions to prevent chronic O&M issues and reduce SSOs. This presentation will also describe the Program Manager’s process to evaluate the condition of 64 pump stations in the WWTA’s collection system. The WWTA is a regional wastewater system, so each pump station is critical to the daily operations of the utility. Therefore, a detailed analysis of each station was conducted, which included the use of artificial intelligence (SewerAI) to capture detailed data of each pump station. Other plans and programs will briefly be presented such as the Sanitary Sewer Evaluation and Rehabilitation (SSER) Work Plan and prioritization of the system into work groups to be completed over the CD term, as well as specific elements of the Capacity, Management, Operations and Maintenance Program.