Superfund Site Profile

Public Meeting Presentation Slides - May 4, 2017 (PDF)

Post Card Public Meeting - May 4, 2017 (PDF)

The Army Corps of Engineers awarded a contract in late April 2017 to CTI and Associates (Novi, MI) for the landfill cap construction.  The Army corps is administrating the contract for the EPA.  CTI is currently working to submit required plans before any work begins at the landfill.  It is expected that work on the landfill will begin during Summer 2017.  Once the landfill cap construction begins, it is expected to last approximately 18 months.

The Site cleanup also involves the treatment of groundwater.  The first round of in-situ chemical oxidation groundwater injections took place during April and May of 2017.  EPA contractors will sample site groundwater monitoring wells in July and August 2017 to determine how the first round of injections went.  Depending on the results, a second round of groundwater injections may be necessary in October/November 2017.

A multi-layer cap for the landfill

  • All waste located outside the landfill will be removed or put below the cap
  • The landfill will be vegetated, and landscaping will be designed around the Site
  • The cap will prevent exposure to all landfill contaminants
  • A drainage system for the landfill will be installed
  • To learn more about landfill caps, click here.

Groundwater cleanup

  • Installation of injection wells to treat the contamination
  • Installation of additional monitoring wells to monitor cleanup effectiveness
  • To learn more about in-situ treatment of groundwater, click here.


The 56-acre Watson Johnson Landfill site is located in Richland Township, Pennsylvania. A 32-acre landfill accepted industrial and municipal wastes on part of the site from the late 1950s until the early 1970s. Waste disposal activities contaminated soil, sediment and groundwater. The EPA added this site to the National Priorities List on September 13, 2001. The agency has conducted a comprehensive site study, known as the Remedial Investigation/Feasibility Study. Data from this investigation was used to determine the nature and extent of the contamination and to develop cleanup plans. The Remedial Investigation Report was finalized in May 2006 and is part of the Administrative Record for the site. A Pilot Study of chemical oxidation of ground water contaminants was conducted with favorable results. A Proposed Plan was issued for the Site for public comment and a Public Meeting was held on September 25, 2008 to discuss EPA's proposal. The Record of Decision for the Site was signed on August 14, 2009. The Remedial Design was initiated in November 2009 and a pre-design investigation was conducted. The Remedial Design was completed in September 2011.  The groundwater cleanup began in early 2017 and landfill work is expected to begin in Summer 2017.

To learn more about this site and EPA's cleanup process, please see the Watson Johnson Landfill Superfund Site Record of Decision.