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Record of Decision System (RODS)

NORTH PENN - AREA 6

Abstract

Site Name:  NORTH PENN - AREA 6
Address:  W 3RD ST 
City & State:  LANSDALE  PA  19446
County:  MONTGOMERY
 
EPA ID:  PAD980926976
EPA Region:  03
 
NPL Status:  Currently on the Final NPL
 
ROD Type:  Record of Decision
ROD ID:  EPA/ROD/R03-95/203
ROD Date:  09/29/1995
Operable Unit(s):  01
 
Media:  soil, groundwater
 
Contaminant:  Trichloroethene, tetrachloroethylene, 1,1,1-trichloroethane, 1,1,2-trichloroethane, 1,1-dichloroethane, 1,2-dichloroethane, 1,1-dichloroethene, cis- and trans-1,2-dichloroethene, chloroform, carbon tetrachloride, trichloroflouromethane, vinyl chloride, methylene chloride
 
Abstract:  Please note that the text in this document summarizes the Record of Decision for the purposes of facilitating searching and retrieving key text on the ROD. It is not the officially approved abstract drafted by the EPA Regional offices. Once EPA Headquarters receives the official abstract, this text will be replaced.

This site is located in Lansdale, Montgomery County, Pennsylvania, and was listed on the National Priorities List (NPL) in March 1989 due to contamination of groundwater by volatile organic compounds (VOCs). The contamination at the North Penn Area 6 site was first noted in 1979 in several North Penn Water Authority (NPWA) wells in the area. The affected wells were immediately taken out of service because of the high trichloroethylene (TCE) levels in the groundwater.

The site is located in an area that contains a mixture of commercial, industrial, and residential uses. All residences within the immediate area use public drinking water supplies. There are private wells in use outside of the known area of groundwater contamination.

During the Remedial Investigation/Feasibility Study (RI/FS), soils were evaluated at several nearby properties and on this property to assess their contribution to the groundwater contamination.

Contaminants to the groundwater and soil were identified. These contaminants include: trichloroethene, tetrachloroethylene, 1,1,1-trichloroethane, 1,1,2-trichloroethane, 1,1-dichloroethane, 1,2-dichloroethane, 1,1-dichloroethene, cis- and trans-1,2-dichloroethene, chloroform, carbon tetrachloride, trichloroflouromethane, vinyl chloride, methylene chloride.
 
Remedy:  The selected remedy for this site is in place processing with hot air injection. Excavation and off-site disposal is the backup alternative if the other remedy is not able to achieve cleanup standards.

The selected remedy will involve the processing of soils at each of the four properties with an excavator or similar equipment which is equipped with devices to inject hot air into the contaminated soil. The unit digs into the soil while injecting the hot air, driving off the volatiles. The vapors are then collected in a hood that sits on top of the soil above the digging arm, and captured in a carbon adsorption unit. Cement or other binder materials will be added during the last round of processing at locations where metals are present, to bind up the metals.
 
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