The City Lagoon #3 site is a closed, 1-acre wastewater treatment lagoon in Camdenton. The former lagoon was located in a mixed residential/commercial area, about 500 feet northeast of the intersection of Dawson Road and Sunset Drive. From 1961 to 1989, the city of Camdenton operated City Lagoon #3, which received domestic sewage from the surrounding residences, stormwater and untreated wastewater from the 221 Sunset Drive manufacturing facility and other commercial waste streams. In July 1989, the city closed the lagoon by draining the water and removing the sludge, which was transported to a permitted disposal site at the Camdenton Municipal Airport. The site is currently an open field area with grassy vegetation and restricted access.
The industrial wastewater received from the 221 Sunset Drive manufacturing facility contained chromium, copper, zinc and trichloroethylene (TCE), also referred to as trichloroethene. In 1993, TCE was detected in the Mulberry Well, which was one of Camdenton’s public drinking water wells. As part of the Resource Conservation and Recovery Act (RCRA)-equivalent site investigation occurring at the 221 Sunset Drive manufacturing facility, the department performed a soil investigation at the former City Lagoon #3 in 1996. Sampling results from the investigation confirmed TCE was present in the soil near the former lagoon outfall and near the center of the former lagoon. The source(s) of TCE contamination in the Mulberry Well are likely a combination of releases from the 221 Sunset Drive manufacturing facility and City Lagoon #3. Because the untreated wastewater from the 221 Sunset Drive manufacturing facility mixed with sanitary wastes from nearby residences in the sewer system on its way to City Lagoon #3, legal limitations were imposed on the department’s ability to use RCRA authority to investigate the groundwater contamination. The groundwater contamination issue was referred to the department's Superfund Section and is regulated under the Comprehensive Environmental Response, Compensation, and Liability Act (CERCLA). As a result, the department began a Superfund investigation at the lagoon in 1998. In that investigation, the department documented residual TCE contamination remaining in the lagoon area.