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Record of Decision System (RODS)

NORTH PENN - AREA 12

Abstract

Site Name:  NORTH PENN - AREA 12
Address:  TROOPER RD 
City & State:  WORCESTER  PA  19490
County:  MONTGOMERY
 
EPA ID:  PAD057152365
EPA Region:  03
 
NPL Status:  Currently on the Final NPL
 
ROD Type:  Record of Decision
ROD ID:  EPA/541/R-97/088
ROD Date:  09/30/1997
Operable Unit(s):  01
 
Media:  Soil,Water,Sediment(s),Groundwater ,Surface Water
 
Contaminant:  Trichloroethene (TCE), 1,1,1-trichloroethane (1,1,1-TCA), VOCs
 
Abstract:  The North Penn - Area 12 site includes the former Transicoil facility, which occupies approximately 25 acres on Trooper Road in Worcester Township, Montgomery County, Pennsylvania. The Transicoil facility was used for industrial and manufacturing activities from approximately 1952 to 1991. Activities included the manufacturing of electric motors for use by the aerospace industry. As part of the manufacturing operations, trichloroethene (TCE), 1,1,1-trichloroethane (1,1,1-TCA) and possible other solvents were used to degrease parts and equipment and were allegedly disposed of on the facility property.Adjacent to the former Transicoil facility is the former Control facility for a Nike Missile Battery installation (PH-191) that had been operated by the U.S. Army. The Nike Control facility property was used by the Army from 1954 to 1968 and was located on approximately 12 acres of land. Both TCE and 1,1,1-TCA allegedly were used and disposed of while it was in operation. In 1975, about 9 acres of the property were donated to Worcester Township and are now maintained as a park known as Nike Park. The remaining portion of the property was assigned to the Commonwealth of Pennsylvania, and is currently operated by Montgomery County as a rehabilitation center for the handicapped known as the Center Point Training Center.Sampling of soil and groundwater at the Transicoil facility in 1979, carried out by the Pennsylvania Department of Environmental Protection (PADEP) (then the Pennsylvania Department of Environmental Resources), indicated the presence of TCE and 1,1,1-TCA in groundwater below the Transicoil property and several surrounding properties' wells. Investigation of contamination at the Transicoil facility and in the surrounding area has been conducted on several occasions since that time. An investigation in 1980 included: sampling near a buried waste solvent tank; sampling of the contents of the waste solvent tank; sampling from underground septic system distribution boxes; and soil sampling in the septic system drain field area. Groundwater in two monitoring wells was also monitored for one year.In January 1987, the Transicoil property was proposed for inclusion on the National Priorities List. A soil-gas survey was completed on the Transicoil facility in 1988. A consent agreement between the U.S. Environmental Protection Agency (EPA) and two potentially responsible parties (PRPs), Transicoil, Inc. and Eagle-Picher Industries, Inc. ("Transicoil/Eagle-Picher") was executed in 1989 and led to the initiation of an Remedial Investigation/Feasibility Study (RI/FS) at the site. A soil-gas survey conducted by Transicoil/Eagle-Picher in 1990 as part of the RI/FS indicated elevated levels of volatile organic compounds (VOCs) near Building No. 2 and the drum storage areas. Levels of TCE and 1,1,1-TCA were very low, although significant concentrations of vinyl chloride, a TCE degradation product, was detected. A hydrogeologic study was conducted in July and August 1988, and indicated the presence of TCE contaminated groundwater plume that seemed to be moving from east to west and was centered beneath the Transicoil property. Twelve monitoring wells were installed on and near the Transicoil property between 1988 and 1990. Residential wells near the former Transicoil facility were sampled in 1990 and again in 1991. During the residential well sampling, 13 home wells were found to contain TCE above the safe drinking water Maximum Contaminant Level (MCL) of 5 parts per billion (ppb). Transicoil/Eagle-Picher agreed to install and maintain carbon filtration systems on those home wells that exceeded the 5 ppb MCL.As a result of residential well sampling conducted in 1995 by EPA, additional residential wells were found to be contaminated with TCE above the 5 ppb MCL. EPA subsequently issued an order to four PRPs that required the installation and maintenance of carbon filtration systems on residential wells found to be contaminated with TCE above the MCL. Periodic sampling of over 100 residential wells near the site was also required to ensure that TCE levels in residential water supplies would be maintained at safe levels. Fourteen additional home wells have been provided carbon filters in accordance with the 1995 order.
 
Remedy:  EPA, in consultation with PADEP, has selected the following remedial action for the North Penn Area 12 Superfund site. This remedy addresses alternative drinking water and contaminated groundwater at the site and includes: a groundwater extraction and treatment system utilizing either an air stripper with vapor phase carbon or a liquid phase carbon adsorption unit. The treated groundwater will be reinjected into the ground by injection wells, an infiltration bank, or spray irrigation, if it can be demonstrated that such reinjection can be accomplished without adversely impacting the ability of the pumping system to contain the existing contamination from migrating from the former Transicoil property portion of the site. If the study shows that reinjection is not feasible, then the treated water will be discharged to a tributary to Stoney Creek; a study will be conducted during the pre-design, design, or implementation of the extraction system to determine what, if any, remedial measure(s) may be needed or are technically practicable to reduce site related contaminants to MCL concentrations in contaminated groundwater that lies beyond the influence of the selected pump and treat extraction system. The public water supply will be extended to provide drinking water to residents whose wells have been adversely affected or could potentially be adversely affected by groundwater contamination from the site. Long-term groundwater monitoring will be conducted to evaluate the performance of the groundwater extraction and treatment system and to ensure that all affected and potentially affected residents are provided public water. Institutional controls will prohibit the use of groundwater on the former Transicoil property and restrict the use of site-related contaminated groundwater as a drinking water supply source.
 
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