Record of Decision System (RODS)
OLD CITY OF YORK LANDFILL
|Site Name:||OLD CITY OF YORK LANDFILL|
|Address:||RD# 1 SOUTH RD|
|City & State:||SEVEN VALLEYS PA 17360|
|NPL Status:||Currently on the Final NPL|
The Old City of York Landfill Superfund Site (the "Site") is located in a rural setting approximately 10 miles south of the City of York, on South Road in Springfield Township, York County, Pennsylvania. According to local tax maps, the Site occupies a 178-acre tract of land. Approximately 56 acres of the Site were actually landfilled.
The Old City of York Landfill was operational from 1961 to 1975 and was intended to receive only municipal wastes. The landfill was owned and operated by the City of York until 1968, at which time the operation of the landfill was transferred to private firms which were under contract with the City of York. Material disposed of at the landfill was predominantly municipal refuse with some commercial and industrial wastes. Refuse was disposed in three areas: Areas 1, 2, and 3. The landfill was closed in 1975, and the property was sold to Dr. Roger and Mary Lou Boser in 1978. The Bosers currently own and reside on the Site property. The Site is currently used mainly for grazing of horses and
recreation by the current landowner, and a small northern section of the Site (not over landfilled areas) is leased to grow crops for animal consumption.
Based on questions concerning water quality raised by local private residents in the early 1980's, a residential well sampling program was undertaken to analyze well samples for volatile organic compounds ("VOCs"), metals and other water quality parameters. VOCs were reported in six residential wells located adjacent to the site. As a result of the presence of VOCs in these residential wells, a public water main was installed along South Road from the Town of seven Valleys, located 1.5 miles northwest of the Site. In 1982, a construction moratorium was recommended to Springfield Township by the Pennsylvania Department of Environmental Protection ("PADEP"). Ground water usage restrictions are discussed in more detail in the Risk Assessment portion of this document.
EPA issued a Unilateral Administrative Order (UAO) in June 1992 for the performance of the remedial design/remedial action (RD/RA) at the Old City of York Landfill Site. The RD was completed in May 1995. The groundwater pump and treat system commenced operation in June 1996 prior to the completion of all the construction activities at the site.
Start up of the groundwater extraction and treatment system occurred on June 17, 1996. Since that time, the extraction and treatment system has been in virtually continuous operation, excluding minor downtime, and has been operated as designed.
In September 1998, the State submitted a formal request and proposed scope of work to EPA to modify the remedy by possibly replacing the existing groundwater extraction and treatment system with monitored natural attenuation (MNA) to complete the cleanup of groundwater to maximum contaminant levels (MCLs) in Area 1 and Area 3 in conjunction with institutional controls (ICs)(e.g., easements and covenants, title notices and land use restrictions through agreements or orders) to ensure protection of human health and the environment. Specifically, the ICs would prevent the installation of any new groundwater wells and/or groundwater extraction from existing wells, as necessary, to prevent migration of the contaminant plume off the landfill property boundary.
In November 1998, the State submitted the report entitles the "Alternative Groundwater Remedy Evaluation Report" which documented the results of the additional field work and compared the MNA/institutional control remedy to the existing pump and treat remedy as designed and implemented. A Record of Decision Amendment was completed in March 2000.
The selected remedy for both Area 1 and Area 3 will include the following activities:
Natural attenuation processes shall be allowed to reduce the concentrations of volatile organic compound (VOC) contaminants in the groundwater at the site to levels that protect human health and the environment. EPA has determined that the appropriate cleanup levels for the contaminants in the groundwater shall be drinking water maximum contaminant levels (MCLs) as referenced in Table 29 of the 1991 Record of Decision (ROD) with one modification. The cleanup level referenced for methylene chloride in Table 29 of the 1991 ROD is 11ug/l. This cleanup level for methylene chloride is a risk-based remediation level as established in the original remedial investigation/feasibility study. Since the issuance of the 1991 ROD, EPA has established an MCL of 5 ug/l for methylene chloride.
A statistical evaluation of the monitoring data shall be performed every two years, unless EPA determines that more frequent analysis is required, to determine the rate at which natural attenuation processes are reducing VOC levels at this site.
Monitoring shall be performed to measure changes in contaminant concentrations in the groundwater plume at the site until the cleanup levels have been achieved.
Samples shall be collected from the monitoring points on a quarterly basis for up to 30 years. Samples shall be collected and analyzed for VOCs.
If EPA determines that a statistical evaluation of the groundwater data collected for the first eight quarters of the monitoring program demonstrates that natural attenuation processes are reducing the contaminant concentration at a reasonable rate and that the contaminants are not significantly migrating, EPA may reduce the frequency of sample collection and may limit the scope of analysis required. In the event that the statistical evaluation of the first two years of data indicate that natural attenuation processes continue to reduce the plume with no evidence of migration of VOCs, EPA may reduce the sampling frequency to semi-annual or annual. If EPA determines that contaminant levels are not decreasing at a reasonable rate or that significant contaminant migration is occurring, EPA may increase the frequency of sample collection, may require additional analysis, or trigger the contingent remedy to restart the pump and treat system. Should the contingent remedy be triggered, an Explanation of Significant Difference (ESD) or ROD Amendment would be required.
Institutional controls (e.g., easements and covenants, title notices and land use restricting through agreements or orders) shall be implemented on individual properties, as necessary, to prohibit or restrict groundwater extraction from existing groundwater wells within the immediate site vicinity in order to prevent migration of the existing plume. The institutional controls may also prohibit the installation of any new wells, as necessary, to ensure that contaminated groundwater is not inadvertently drawn off the property boundary and resulting in contamination of previously uncontaminated areas.
The Restrictive Covenant that is currently in place on the landfill property shall remain in effect.
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