NORTH PENN - AREA 6
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The North Penn Area 6 Site is located within the North Penn Water Authority (NPWA) service district in Montgomery County, Pennsylvania. Five other National Priorities List (NPL) sites (North Penn Areas 1, 2, 5, 7, and 12) and a state Superfund Site (North Penn Area 4) have also been identified in the NPWA area.
This site is in the Borough of Lansdale and small portions of Hatfield, Towamencin and Upper Gwynedd townships. The preliminary boundaries of the site were determined based on groundwater quality data. In 1979, high levels of trichloroethene (TCE) were detected in several wells within the Lansdale area. This discovery led to the addition of the site to the NPL in 1989. The site is situated over a large area with commercial, industrial, and residential uses.
What Is Being Done to Clean Up the Site?
The site is being addressed through federal, state and Potentially Responsible Party (PRP) actions. Cleanup of the site is divided into three Operable Units, as described below:
Operable Unit 1 (OU1) – Twenty-Six (26) properties were initially identified by EPA as potential sources of contamination at the site. Beginning in 1993, EPA evaluated 20 of the properties as part of the OU1 Source Control OU. Based on the OU1 Remedial Investigation/Feasibility Study (RI/FS), EPA determined that soil contamination at four of the properties may have contributed to groundwater contamination and required remedial action. In September 1995, EPA issued the OU1 Record of Decision (ROD), which required soil remediation at the four properties. Cleanup activities associated with the OU1 soil remedy have been completed.
Operable Unit 2 (OU2) - OU2 consists of six properties identified initially as having contributed to soil contamination at the site, but which were not addressed in the OU1 effort. Under OU2, the owners or operators of these six properties conducted soil investigations in accordance with an Administrative Order on Consent for RI/FS (RI/FS AOC) under EPA oversight. The potentially responsible parties at four of the properties have completed the work required at their respective properties under the RI/FS AOC. Investigations for soil contamination are ongoing at the remaining two properties.
Operable Unit 3 (OU3) - The groundwater at the site is being addressed as OU3. EPA completed the RI/FS for OU3 in 1999, and issued a ROD for OU3 in 2000. The remedy set forth in the OU3 ROD consists of groundwater extraction and treatment, monitoring of residential wells, and long-term monitoring of the groundwater. Currently, ten properties have been selected for installation of groundwater extraction and treatment systems, including the Property. EPA is responsible for implementing the remedy at six of the ten properties, and the remedy at the remaining four properties is being implemented by the respective responsible parties. To date, EPA has installed groundwater extraction and treatment systems at five of the properties. The respective responsible parties constructed and are currently operating treatment systems at two properties and remedial design activities are underway to install systems at two additional properties. The need for groundwater treatment is being reassessed at the remaining property.
EPA transitioned operation and maintenance of the treatment systems at four of the properties to the Pennsylvania Department of Environmental Protection (PADEP) in 2014 and 2017.
Multiple vapor intrusion investigations have been performed at the ite at various parcels, but a comprehensive vapor intrusion investigation has not been performed. EPA is currently evaluating current and historic groundwater and vapor intrusion sampling data to determine if additional vapor intrusion investigation is warranted.
What Is the Current Site Status?
Operable Unit 1 (OU1) – In September 1995, EPA issued the OU1 Record of Decision (ROD), which required soil remediation at four properties. The OU1 remedial action was completed in 2004.
Operable Unit 2 (OU2) - The potentially responsible parties at four properties have completed the work required at their respective properties under the Remedial Investigation/Feasibility Study Administrative Order on Consent (RI/FS AOC). Investigations for soil contamination are ongoing at the remaining two properties.
Operable Unit 3 (OU3) - To date, EPA has installed groundwater extraction and treatment systems at five properties at OU3. The respective responsible parties constructed and are currently operating treatment systems at two properties and remedial design activities are underway to install systems at two additional properties. The need for groundwater treatment is being reassessed at one additional property.
On March 3, 2017, a final notice of Partial Deletion for the Site was published in the Federal Register. This partial deletion removed approximately 6.5 acres of the North Penn Area 6 Superfund Site, referred to as the Administrative Parcel, from the NPL. EPA, in consultation with PADEP, determined that all appropriate response actions had been performed at the Administrative Parcel and that no further cleanup was required. The current property owner plans to reuse/redevelop the Administrative Parcel into a major residential development with 174 semi-attached condominium units.