This project demonstrates Freese and Nichols' ability to provide a wide range of environmental investigation and remediation services for municipal brownfield-type sites. The Riverside Waste Water Treatment Plant was in operation from the 1920s until 1979. A portion of the former plant area was converted to a public park in the mid-1980s. In 2002, the City of Fort Worth Water Department was notified that polychlorinated biphenyls (PCBs) and heavy metals had been found in residual sewage sludge located in digesters and former lagoons near the plant.
Freese and Nichols completed an initial human health risk assessment, which allowed the City to keep the softball complex open to the public. Freese and Nichols assisted the City with enrolling the site in the TCEQ´s Voluntary Cleanup Program (VCP) in the summer of 2002. Freese and Nichols submitted an affected property assessment report in accordance with the Texas Risk Reduction Program in November 2003. The various investigative and remedial efforts associated with this project are also being conducted in compliance with the National Contingency Plan. Freese and Nichols has prepared an Engineering Evaluation/Cost Analysis report and a Community Relations Plan.
Freese and Nichols completed the design of an innovative protective cap for three soccer/rugby fields in June 2005. Remedial action on this portion of the site was fast-tracked due to fields’ importance to the community as a recreational asset. The cap system includes synthetic grass fields that overlay an HDPE liner. Construction was completed for this portion of the site in November 2006, and TCEQ issued a certificate of completion in 2008.
Freese and Nichols also completed a pilot engineering test on the site to evaluate sludge removal and disposal options for residual sewage sludge found inside nine digesters located on the site. The nine digesters contain an estimated 5.7 MG of sludge containing PCBs. The study included testing for radioactive isotopes. Freese and Nichols developed an on-site treatment system to remove PCBs and heavy metals from aqueous sludge found inside these digesters. Frees and Nichols prepared plans and specifications to remove sludge from the remaining eight digesters. Sludge removed was completed in 2013.
This project placed first in the Study category of Freese and Nichols' Innovation Award Competition.