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Record of Decision System (RODS)

AVCO LYCOMING (WILLIAMSPORT DIVISION)

Abstract

Site Name:  AVCO LYCOMING (WILLIAMSPORT DIVISION)
Address:  652 OLIVER ST 
City & State:  WILLIAMSPORT  PA  17701
County:  LYCOMING
 
EPA ID:  PAD003053709
EPA Region:  03
 
NPL Status:  Currently on the Final NPL
 
ROD Type:  Record of Decision
ROD ID:  EPA/541/R-97/012
ROD Date:  12/30/1996
Operable Unit(s):  02
 
Media:  groundwater
 
Contaminant:  hexavalent chromium
 
Abstract:  The Avco Lycoming (Williamsport Division) site is an active manufacturing facility located at 652 Oliver Street in Williamsport, Lycoming County, Pennsylvania. This site contains chromium-contaminated groundwater. The U.S. Environmental Protection Agency (EPA) and the Pennsylvania Department of Environmental Protection (PADEP) were involved in selecting a remedy designed to address shallow contaminated groundwater beneath the facility property. On June 28, 1991, EPA issued a Record of Decision (ROD) for the contaminated groundwater. The 1991 ROD called for the contaminated groundwater under the plant property to be extracted, treated, and discharged to nearby Lycoming Creek. The chromium-contaminated groundwater would be extracted through a series of extraction wells, pumped to the existing waste water treatment plant, and discharged. The organic-contaminated groundwater would be extracted through a separate series of extraction wells and then pumped to on-site air strippers for treatment and discharge.The estimated time frame to achieve the cleanup goal using this remedy was at least 30 years. An alternate remedy was selected for more efficient cleanup and less potential for exposure to contaminants. The alternate remedy (air sparging/soil vapor extraction (SVE) and metals precipitation) will achieve cleanup in less time than the 1991 remedy, since treatment of the groundwater with the presence of a continuing source of contamination in the soils makes complete remediation difficult with conventional pump and treatment technology.
 
Remedy:  The selected remedy includes groundwater extraction for at least 15 years. During this time, the system¿s performance will be carefully monitored on a regular basis and adjusted as warranted by the performance data collected during operation. Monitoring will include groundwater sampling. The sampling points will be strategically placed around the air sparging/SVE and metals precipitation systems. The components of the air sparging/SVE system will include the following: a series of air sparging and SVE wells along the perimeter of the site, air compressors, blowers and associated piping and equipment, and vapor-phase carbon for off-gas treatment. The components of the in-situ metals precipitation system will include the following: a series of molasses injection wells, mixing tanks for molasses solution, pumps, piping and associated equipment for molasses injection, and a programmable logic controller to automatically control the amount of solution injected. Data will be collected to evaluate the performance of the air sparging/SVE and in-situ metals precipitation.The selected remedy also includes: the installation of a molasses injection system in the western portion of the facility property to address groundwater contaminated with hexavalent chromium. The system will include a series of molasses injection wells, mixing tanks for molasses solution, pumps and piping for molasses injection, and a programmable logic controller. The other major component is the installation of an air sparging/soil vacuum extraction system in the central and eastern portions of the facility property to address shallow groundwater contaminated with organics. The system will include a series of air sparging and SVE wells, air compressors, blowers, and associated piping and vapor-phase carbon for off-gas treatment.
 
Text:  View full-text ROD [ 26K ]
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