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Record of Decision System (RODS)

RAYMARK

Abstract

Site Name:  RAYMARK
Address:  220 JACKSONVILLE RD 
City & State:  HATBORO  PA  19040
County:  MONTGOMERY
 
EPA ID:  PAD039017694
EPA Region:  03
 
NPL Status:  Currently on the Final NPL
 
ROD Type:  Record of Decision
ROD ID:  EPA/ROD/R03-92/144
ROD Date:  12/30/1991
Operable Unit(s):  01
 
Media:  Soil
 
Contaminant:  VOCs
 
Abstract:  SITE HISTORY/DESCRIPTION: The 7-acre Raymark site is an active metal manufacturing and electroplating plant in the Borough of Hatboro, Montgomery County, Pennsylvania. The site, located in an industrial area, is approximately 100 feet from the nearest residence. The nearest surface water is Pennypack Creek, which flows 4,000 feet southwest of the site. As part of the rivet manufacturing process at the plant, VOCs, including 30 to 40 gallons of TCE, were used daily at the site to clean and degrease metal parts. Facility documents indicate that piping may have directed waste from the degreasing unit to four small lagoons, which contained effluent from an onsite wastewater treatment building. The lagoons were subsequently cleaned and backfilled in the 1970;s. In 1979, when EPA discovered TCE in the Hatboro public water supply wells, the Hatboro Borough Water Authority removed the wells from operation, and supplemented the water supply using an interconnection with a neighboring water company. FurtherEPA site investigations from 1980 to 1987 identified TCE in soil and other wells onsite and adjacent to the property and concluded that site contaminants were a contributing source of contamination in the downgradient public water supply wells. In 1987, the site owners agreed to install ground water treatment units with air stripping towers, and, as necessary, air emission control units, at two Hatboro public supply wells to return these to routine operation. EPA site investigations also revealed high concentrations of TCE and lower levels of PAHs and PCBs in soil. In 1990, a pilot scale treatability study was conducted to evaluate the effectiveness of Soil Vapor Extraction (SVE) as a remedial technology for the site soil and underlying bed rock. A 1990 ROD addressed contamination of the drinking water and risks posed by ground water as OU2 and OU3, respectively. This ROD addresses the soil/source of contamination as the final action at the site, as OU1. The primary contaminants of concern affecting the soil/source are VOCs, including 1,2-DCE, PCE, and TCE. PERFORMANCE STANDARDS OR GOALS: Chemical and location-specific performance goals are based on federal and state standards. VOCs will be removed from the soil/source such that TCE in subsurface soil does not exceed 50 ug/l. VOCs will be removed from subsurface soil so that leaching of TCE from subsurface soil will not exceed SDWA ground water MCLs. Organic emissions will be minimized from the vapor extraction system such that the maximum rate of organic emission does not exceed 3 pounds per hour or 15 pounds per day. Infiltration of contaminants through the low permeability cap shall not exceed 9 cubic feet per day. Water potentially generated during the SVE process will be treated to meet CWA levels, as stated in the ROD for OUs 2 and 3. The excess cancer risk resulting from site-related contamination will be reduced to a 10[-6] level and the HI will equal 1. INSTITUTIONAL CONTROLS: Institutional controls will be implemented, including deed restrictions to restrict access to the contaminated soil, to prevent disturbance to the cap and ensure the integrity of the selected remedy.
 
Remedy:  SELECTED REMEDIAL ACTION: The selected remedial action for this site includes constructing, operating, and maintaining a soil vapor extraction system to remove VOCs from soil and unsaturated bedrock; treating air emissions from the extraction process using vapor phase carbon adsorption; constructing and maintaining a low permeability cap over the treated soil to minimize infiltration; conducting additional sampling of surface soil; and implementing institutional controls including deed restrictions, and site access restrictions. The estimated present worth cost for this remedial action is $3,654,400, which includes an annual O&M cost of $1,220,600 for 20 years.
 
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