Announcing the Availability of the Third Five-Year Review Report, 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 with assistance from the Nebraska Department of Environmental Quality (NDEQ) completed the third five-year review of the Lindsay Manufacturing Co. (LMC) Superfund site. The site is in Platte County, adjacent to Lindsay, Nebraska. EPA conducted the five-year review to ensure the remedial actions have been implemented to continue to protect human health and the environment.
Public Availability Session
To discuss the results of the
Thursday, September 25, 2008
4:30 – 7:30 p.m.
Lindsay Town Hall
2nd and Pine streets
LMC 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, LMC 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 LMC 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, LMC 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, 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 extraction wells should be installed to control the plume movement.
- 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 by LMC to address the remaining ground water contamination.
LMC performs quarterly ground water monitoring to aid EPA and NDEQ in evaluating the progress of the aquifer restoration.
Third Five-Year Review Results
EPA evaluated all available site information to determine if the remedial actions that have been implemented remain protective of human health and the environment.
The results of the Third Five-Year review concluded that the remedy was protective of human health and the environment and that:
- No known nearby residents are being exposed to contamination.
- Two domestic wells affected by the contaminant plume are being treated to remove site-related contaminants.
- Based on LMC's voluntary site reuse investigation activities, additional areas requiring further investigation and enhanced ground water treatment were identified.
- LMC completed installation and activation of a downgradient extraction well to treat the ground water contamination, and
- Discharge of ground water by LMC to Shell Creek from extraction wells is determined to be protective and LMC will conduct additional sampling activities of surface water to verify this determination.
LMC will identify occupied structures above the contaminant plume starting with the source area and conduct a vapor intrusion assessment to determine if any areas have the potential to be affected by the soil and ground water contamination.
Carbon tetrachloride and methyl tert butyl ether (MTBE) not related to LMC and below the drinking water standards were detected in area private wells. This information has been referred to the EPA and NDEQ site assessment programs for further evaluation.
LMC continues to collect periodic ground water samples and may enhance the monitoring system through installation of additional monitoring sampling points based on the best available data. The availability of institutional controls and the opportunity for their implementation will be evaluated.
The Third Five-Year Review Report and the site Administrative Record are 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