HARRISON TOWNSHIP, PA
On this page:
- What Has Been Done to Clean Up the Site?
- What Is the Current Site Status?
- Activity and Use Limitations
On related pages:
The Lindane Dump Superfund Site is located in Harrison Township in Allegheny County, Pennsylvania. The area consists of a 14-acre park and a 47.5-acre lower project zone that includes a closed landfill area. Pesticide and industrial waste were dumped at the site from the mid 1800s to the 1980s. Cleanup activities included capping the site and constructing a leachate collection and treatment system. Operation and maintenance activities at the site are ongoing.
After the completion of cleanup activities at the site in 1999, the Alsco Community Park was restored. The park now includes tennis courts, baseball fields, a utility building, pedestrian paths, picnic areas, open space and parking areas.
What Has Been Done to Clean Up the Site?
The Lindane Dump Superfund Site is located in Allegheny County, Pennsylvania. From 1850 until 1986, several companies used the site for waste disposal. Wastes disposed of at the site include wastes from mining, chemical manufacturing, electrical generation, steel manufacturing and building demolition. The contaminants of concern at the site include volatile organic compounds (VOCs) and organic pesticides (lindane) in the soil, groundwater, and leachate. The site was added to the National Priorities List (NPL) in 1983.
The Record of Decision (ROD) (PDF) for the site was signed in 1992. The selected remedy included a multilayer cap, with permanent stormwater management features, installed over approximately 18 acres of the site. The cap is intended to prevent potential exposure to contaminants present in surface and near-surface soils and to reduce or eliminate infiltration of water into the fill area. A leachate collection and treatment system was constructed to address contaminated leachate and shallow groundwater discharging below the site near Karns Road. The contaminated leachate and groundwater is collected, treated to meet the National Pollutant Discharge Elimination System (NPDES) permit equivalent limits, and discharged to the Allegheny River. The ROD also required institutional controls to restrict activities at the site that could damage the landfill cap, which were signed in 2000.
Construction of the cap began in the spring of 1998 and finished in the spring of 1999. Once the cap was completed, the Harrison Township’s Alsco Community Park was restored and new facilities added. The lower portion of the site is fenced and covered with an impermeable cap.
What Is the Current Site Status?
Operation and maintenance of the landfill cap, the leachate collection and treatment system, and monitoring of the groundwater and treated effluent are conducted by the potentially responsible party, with oversight from the EPA.
EPA has conducted several five-year reviews of the site’s remedy. These reviews ensure that the remedies put in place protect public health and the environment, and function as intended by site decision documents. The most recent, 2018 Five-Year Review (PDF), concluded that the remedy continues to be protective of human health and the environment. Exposure pathways that could result in unacceptable risks are being controlled, and institutional controls are preventing exposure to contaminated wastes, soils, and groundwater. Contaminated leachate and shallow groundwater is being controlled by the leachate collection system (LCS), and it is being treated to a quality below limits established by the National Pollutant Discharge Elimination System permit. Operation and maintenance of the landfill cap, LCS, and treatment system is expected to continue until cleanup goals are met. The next five-year review is scheduled for 2023.
Activity and Use Limitations
At this site, activity and use limitations that EPA calls institutional controls are in place. Institutional controls play an important role in site remedies because they reduce exposure to contamination by limiting land or resource use. They also guide human behavior. For instance, zoning restrictions prevent land uses – such as residential uses – that are not consistent with the level of cleanup.
For more background, see Institutional Controls.
The 1992 Record of Decision required the placement of institutional controls to protect against intrusive activity that would jeopardize the quality of the landfill cap. On January 18, 2000, a Declaration of Restrictive Covenants was recorded in the Allegheny County Recorder of Deeds Office. Additional information about the institutional controls are available in the 2018 Five-Year Review (PDF) (page 12).