Third Five-Year Review to Begin, Lindsay Manufacturing Superfund Site, Lindsay, Platte County, Nebraska
The U.S. Environmental Protection Agency (EPA) conducts regular five-year reviews on Superfund sites, as required by the Superfund law [42 U.S.C. Section 9621(c)]. EPA Region 7 and the Nebraska Department of Environmental Quality (NDEQ) have started the third five-year review of the Lindsay Manufacturing Superfund site. The site is in Platte County, adjacent to Lindsay, Nebraska. EPA and NDEQ are conducting the five-year review to ensure the remedial actions that have been implemented continue to protect human health and the environment.
Lindsay Manufacturing operates on a 42-acre site and manufactures galvanized irrigation systems. Wastes from the galvanizing process were discharged into an unlined lagoon for 10 years between 1972 and 1982. Prior to implementation of the remedial actions, contaminants of concern at the site included: zinc, iron, cadmium, sulfate, chromium, lead and volatile organic compounds (VOCs), including dichloroethlyene, dichloroethane, tetrachloroethylene and trichloroethane.
In 1984, Lindsay constructed and began operating a pump and treat system as an interim remedial action under state oversight to remove and treat the contaminated ground water.
In 1989 the site was added to the National Priorities List. In 1990, a Record of Decision (ROD) was issued that selected the remedy for the site. The remedy included:
- A pilot study to determine if soil vapor extraction (SVE) is practical and if so, design and implementation of a full scale SVE system.
- Enhancement of the existing ground water pump and treatment system by increasing the pumping capacity and/or extraction well installation.
- Installation of additional ground water monitoring wells to further delineate the ground water contaminant plume.
- Continued ground water monitoring of the treatment system and ground water contaminant plume.
- Monitoring to ensure that drinking wells are not installed in the areas of the ground water contaminant plume.
In 1992, a consent decree was entered under which Lindsay agreed to conduct a remedial design and remedial action to implement the remedy selected in the ROD. The site achieved construction completion in 1995.
In 1995, Lindsay began a soil vapor extraction system to remove VOC contamination from soils at the site. This system was operated until spring of 1998 when EPA determined that the soil cleanup standards had been achieved.
Ground Water Restoration
In 1996, the EPA and NDEQ approved using irrigation to dispose of the extracted ground water. A risk evaluation of inhaling VOCs released from the irrigated water concluded that the exposure did not pose an unacceptable risk to nearby residents.
The First Five-Year Review for the site was completed in 1998 and concluded:
- The pumping schedule was effective in containing the contaminant plume.
- The ground water response action would be reviewed yearly to determine the continued effectiveness and protectiveness of the pumping schedule.
- Ground water monitoring would continue to be evaluated to determine if any additional changes are needed.
The Second Five-Year Review was completed in 2003. It concluded that the remedy was protective of human health and the environment and that:
- No known nearby residents were being exposed to contamination.
- Two domestic wells affected by the contaminant plume were being treated to remove site-related contaminants.
- Ground water monitoring indicated that the remedy was functioning as intended.
- Additional irrigation wells should be installed to halt the plume.
- Additional monitoring wells should be installed to define the extent of the downgradient contaminant plume.
In 2004, 2006, and 2007, additional extraction and monitoring wells were installed to address the remaining ground water contamination.
Lindsay performs quarterly ground water monitoring to aid EPA and NDEQ in evaluating the progress of the aquifer restoration.
During the Third Five-Year Review, EPA will evaluate all available site information to ensure the remedial actions that have been implemented remain protective of human health and the environment. We encourage members of the community to identify any site conditions or concerns you may have.
A final report will be prepared at the end of the review and will be available at the site information repositories.
Detailed site information is available at the following locations during normal business hours:
Columbus Public Library
2504 14th St.
EPA Records Center
901 N. Fifth St.
Kansas City, Kansas
Questions or requests for information can be submitted to:
Community Involvement Coordinator
EPA Region 7
901 N. Fifth St.
Kansas City, KS 66101
Toll free: (800) 223-0425