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Lindane Dump

EPA Region 3 (Mid-Atlantic)

Allegheny County
Harrison Township

EPA ID# PAD980712798

4th Congressional District

Last Update: January 2015

Other Names

Pennwalt Lindane Dump
Alsco Community Park

Current Site Status

The site is currently in a long-term operation and maintenance phase that is being conducted by the potentially responsible parties.  EPA completed the 4th Five Year Review of the Site in September 2013.  The purpose of the Five-Year Review is to determine if the remedy at the site is protective of human health and the environment.  EPA found the remedy at the site to be protective of human health and the environment.  There were no issues or recommendations identified in the report.  EPA continues to review site operating reports and will conduct periodic visits to the site.

Site Description

The Lindane Dump site, located in Allegheny County, Pennsylvania, consists of a recreational park about 14-acres in size and a 47 ½-acre lower project zone that includes a closed landfill area. About 400 tons of powdered lindane pesticide waste and other industrial waste were dumped at the site from 1900 to 1950. Industrial waste dumping continued after the sale of the property in 1965. In 1976, a portion of the site was donated by the owner to Harrison Township for use as a park area. There are approximately 13,000 people living within one-mile of the site. Residents near the site obtain water from a municipal system that draws water from the Allegheny River.

The remedy at the site included installation of a multilayer clay and soil cap on 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.  Additionally, the remedy includes an upgraded leachate and shallow groundwater collection and treatment system, institutional controls, and long term maintenance. The remedy continues to operate as it should, and the collected leachate and shallow groundwater are being treated to levels below the discharge criteria established by the Commonwealth of Pennsylvania.

Site Responsibility
This site is being addressed through federal, state and potentially responsible parties' (PRPs) actions.
NPL Listing History
Our country's most serious, uncontrolled, or abandoned hazardous waste sites can be cleaned using federal money. To be eligible for federal cleanup money, a site must be put on the National Priorities List. This site was proposed to the list on September 30, 1982 and formally added to the list on September 8, 1983.

Threats and Contaminants

The ground water and soil are contaminated with pesticides. The site has been capped and an upgraded leachate and shallow groundwater collection and treatment system has been installed. These actions have significantly reduced the possibility that pesticide residues in the soil might leach into the groundwater and surrounding soils. The cap and leachate and shallow groundwater collection and treatment system also prevents humans and wildlife from accidentally ingesting or coming into direct contact with contaminated groundwater, soil, or leachate which may pose health risks.

Contaminant descriptions and risk factors are available from the Agency for Toxic Substances and Disease Registry, an arm of the CDC.

Cleanup Progress

A leachate treatment system was installed and activated to control the spread of pesticide residues. The Pennsylvania Department of Environmental Protection (PADEP) and Pennwalt, a potentially responsible party conducted an investigation into the nature and extent of contamination at the site. The investigation defined the contaminants and recommended alternatives for the final cleanup. In 1983, the State and Pennwalt, agreed to conduct a leachate treatability study to evaluate short- and long-term treatment and disposal alternatives. In 1992, EPA selected the remedy for cleanup of the site which includes capping the site and installing an upgraded leachate control system. In 1993, EPA and Elf-Atochem, a successor of Pennwalt, agreed to a Consent Decree, requiring Elf-Atochem to conduct the remedial design and construction activities for the site. The leachate treatment system reduced the further spread of contaminated materials from the Lindane Dump. Construction of the cap began in the spring of 1998 and was completed in the spring of 1999. A baseball field and tennis courts were constructed on the upper portion of the site which is commonly known as the Alsco Community Park. Operation and maintenance activities will continue for at least 30 years.


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