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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:  Amendment
ROD ID:  EPA/541/R-00/062
ROD Date:  04/06/2000
Operable Unit(s):  02
 
Abstract:  The Avco Lycoming Superfund Site includes the Avco Lycoming Facility located at 652 Oliver Street in Williamsport, Lycoming County, Pennsylvania, plus any additional property to which contamination has migrated or come to be located. Lycoming Creek runs past the Site to the west. The Site, which constitutes the plant property, is approximately 28 acres. The Avco Facility is situated next to a residential neighborhood with some small industry. Portions of the Facility property were first used for manufacturing purposes around the turn of the century. Manufacturing operations consisted of a bicycle and sewing machine Facility, a sandpaper plant, a tool and die shop and a silk plant. During the 1920's, the plant property was purchased by Avco Corporation and plant operations centered primarily on the manufacture and
repair of aircraft engines. The Site was placed on the National Priorities List (NPL) on February 12, 1990.

OU 2:

This ROD Amendment addresses groundwater contaminated with Volatile Contaminated Compounds (VOCs) in three
separate areas:
1) Shallow aquifer beneath the Facility
2) Source Areas
3) Shallow aquifer beyond the Facility/Deep aquifer throughout Site
The ROD Amendment describing the revised remedy and explanation of why the EPA changed to this revised remedy was completed in April 2000.

In April 1992, EPA issues an Explanation of Significant Differences (ESD), which modified the 1991 Record of Decision (ROD) in several ways. The ESD changes the time frame for remediation, identified when recovery well pumping would be discontinued, and redefined the area of attainment.

In May 1992, EPA issued a Unilateral Administrative Order (UAO) to Avco, which required Avco to implement the 1991 ROD and ESD. Activities for the remedial design of the groundwater extraction and treatment system began in December 1992.

In 1995, Avco made a formal request to EPA to perform a pilot study at the site for an in-situ remedy that could be used in place of the groundwater extraction and treatment remedy called for in the 1991 ROD. EPA and the State evaluated Avco's proposal and granted approval for a six month pilot study to by implemented at the site. The design work plan for the groundwater recovery and treatment system was suspended pending the results of the pilot study. The results indicated that each pilot test was successful. As a result, EPA requested that Avco conduct a Focused Feasibility Study (FFS) comparing these technologies to the conventional groundwater extraction and treatment remedy selected in the 1991 ROD. In September 1996, Avco's contractor submitted the FFS to EPA.

On December 30, 1996, the EPA issued a new ROD ("1996 ROD") for groundwater contamination in the shallow aquifer beneath the Facility. The 1996 ROD modified the groundwater remedy for the shallow aquifer identified in the 1991 ROD. The remedy selected in 1996 consisted if two types of treatment for the shallow aquifer beneath the Facility: 1) air sparging and SVE for treatment of the volatile organic compounds (VOCs); and 2) in-situ metals precipitation for treatment of chromium. The 1996 ROD did not address contamination present in the shallow aquifer beyond the Facility and in the deep aquifer throughout the site. The 1996 ROD stated that contaminated groundwater in those areas would be addressed in a future ROD.

In August 1997, EPA amended the 1992 UAO issued to Avco to document the issuance of the 1996 ROD and change the definition of "ROD" in the 1992 UAO to encompass the 1996 ROD, so that the work to be performed under the UAO would reflect the change in remedy selection.
 
Remedy:  The 1996 Record of Decision (ROD) described the treatment technology for both chromium and volatile organic compounds (VOCs) in the groundwater. The 1996 ROD required two types of treatment for contamination in the shallow aquifer beneath the Facility: 1) in-situ metals precipitation for chromium; and, 2) air sparging/SVE for VOCs. The 1996 ROD did not differentiate between the three areas of concern that this ROD Amendment covers: 1) Shallow aquifer beneath the Facility, 2) Source Areas, and 3) Shallow aquifer beyond the Facility/Deep aquifer
throughout the site.

After reviewing all the data, EPA has concluded that although air sparging/SVE could be used to remediate the site, it would not be very effective. The geology in the areas with the VOC contaminated groundwater does not facilitate the use of air sparging/SVE to remediate the shallow aquifer beneath the Facility. Some of the air sparging/SVE wells would be located in silt, which limits the effectiveness of the technology.

The revised remedy will be more effective in attaining the remedial objectives outlined in the 1996 ROD for the (VOCs) contaminated groundwater. The revised remedy will contain and remediate the groundwater in the shallow aquifer beneath the Facility. A subsequent objective of the revised remedy is to reduce the VOC mass in the source areas to assist in reaching the remedial objectives.

The selected remedy in this ROD Amendment for the Avco Lycoming Site is Alternative 1 for remediation of the Shallow Aquifer beneath the Facility: Groundwater extraction, chemical pretreatment for iron, air stripping, emissions control, and discharge of treated water. For the Source Areas, source reduction will be implemented using one or a combination of the following technologies: air sparging/soil vapor extraction; groundwater extraction; and/or in-situ oxidation. EPA will recognize the existing down gradient extraction system, which is being implemented through a Consent Order and Agreement between Avco and the State for remediation of the Shallow Aquifer beyond the Facility and the deep aquifer throughout the site.

The revised remedy is intended to be a final response action for the site. The remedy consists of a groundwater extraction and treatment system installed to effectively capture VOC-contaminated groundwater plume in the shallow aquifer beneath the Facility. The system would be designed based on two performance objectives: 1) containment of the plume, 2) and restoration of the aquifer to beneficial use. For cost purposes, it was estimated that recovery wells would pump the water into an equalization tank. A transfer pump would then pump water through a pretreatment unit into a tray air stripper. A pretreatment system may be necessary due to elevated levels of iron in the groundwater.
The air stripper effluent would be discharged to Lycoming Creek via a discharge pipe or discharge outfall, which would be regulated by a new NPDES permit.

Estimated Capital Cost: $464,800
Estimated Annual O&M Cost: $81,600
Estimated Present Worth Cost: $1,460,000 (Alternative 1 - revised remedy)

Comparative Analysis:

The selected remedy in this Record of Decision (ROD) Amendment for the Avco Lycoming Site is Alternative 1: Groundwater extraction, chemical pretreatment for iron, air stripping, emissions control, and discharge of treated water. The revised remedy is intended to be a final response action for the site.
 
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