Congressional District # 06
SOUTH DAYTON DUMP & LANDFILLEPA ID# OHD980611388
Last Updated: September, 2014
The South Dayton Dump & Landfill (SDDL) Superfund site contains an 80-acre, old industrial landfill located at 1975 Dryden Road in Moraine, Ohio. Early U.S. Environmental Protection Agency (EPA) and Ohio EPA reports indicate that the landfill was 25 acres in area, but more recent information indicates that the landfill is 80 acres in area, with about 40 acres having been built over and/or being used for other commercial/industrial purposes.
The SDDL site is located near the Great Miami River and the landfill itself is separated from the river by about 350 feet of flat open land and the Great Miami River Recreation Trail. Part of the landfill is within the 100 year floodway and more than half of the landfill is within the 100 year floodplain. Seven residences are within 200 feet of the landfill along East River Road and a trailer park is located 200 feet from the landfill east of Dryden Road. The landfill is within a secondary wellhead protection area and there is a well (not used for drinking water) in the northern part of the landfill. The SDDL site also contains a federally-designated wetland.
The SDDL was operated from 1941 to 1996 by filling in a former sand and gravel pit. Chemical drums, metal turnings, fly ash, foundry sand, demolition material, wooden pallets, asphalt, paint, paint thinner, oils, brake fluids, asbestos, solvents, transformers and other industrial wastes were disposed of and some of these materials are found below the water table in direct contact with the groundwater. As the quarried areas of the site were filled in, some of the property was sold and/or leased to area businesses including Valley Asphalt and others along Dryden Road and East River Road. The Miami Conservancy District owns the southern part of the site, which includes part of a large quarry pond. The owners of the remaining undeveloped areas of the landfill would like to develop these areas of the site for commercial and/or industrial use.
EPA proposed the SDDL site to the Superfund National Priorities List in 2004, but did not complete the listing process in favor of addressing the site through its Superfund Alternative Sites (SAS) program.
The South Dayton Dump & Landfill site is being addressed by potentially responsible parties (PRPs) under federal and state oversight.
Threats and Contaminants
Soil at the South Dayton Dump & Landfill site contains heavy metals including lead, copper, antimony, arsenic, barium, beryllium, cadmium, and mercury; plus organic compounds including polychlorinated biphenyls (PCBs), trichloroethene (TCE), tetrachloroethene, and polynuclear aromatic hydrocarbons (PAHs). Groundwater contains vinyl chloride, TCE, 1,2-dichloroethene, arsenic, lead, and other chemicals. Sediment in the water-filled gravel pit contains PCBs, PAHs, and pesticides. Sediment in the adjacent Great Miami River also contains PCBs, PAHs, pesticides and mercury. Soil vapor contains vinyl chloride, TCE and in some cases, methane.
Human exposure to the contaminants could occur through ingestion of and/or dermal exposure to contaminated soil, sediment, or groundwater. Potential health impacts could include both cancer and non-cancer effects. Methane gas generated by decomposing landfill trash could cause explosive levels of gas to build up in area buildings.
EPA conducted a screening site inspection of the landfill in 1991, a focused site inspection prioritization site evaluation in 1995, and an aerial photographic analysis of the site in 2002. Ohio EPA conducted a site team evaluation prioritization of the landfill in 1996. In 2000, Valley Asphalt removed several drums and 2,217 tons of contaminated soils from its property that were uncovered when a sewer line was being excavated.
In 2006, several PRPs agreed to conduct further studies and evaluate cleanup options at the site. This work, termed a remedial investigation/feasibility study (RI/FS), is being conducted under a settlement agreement called an administrative order on consent (AOC) with EPA. In 2008, the PRPs agreed to conduct a streamlined RI/FS at the SDDL site and developed workplans for several investigations.
From 2008 to 2010, the PRPs conducted a geophysical survey, test pit and test trench sampling, vertical aquifer sampling, landfill gas sampling, and groundwater monitoring well installation and sampling. Based on these investigations, the PRPs agreed to divide the site work into two parts or "operable units." Operable unit 1 will involve evaluating cleanup alternatives to address 55 acres of the landfill and will include cleanup alternatives that will allow on-site business to remain safely operating at the site. Operable unit 2 will involve more detailed investigation of surface water and sediment in the on-site quarry pond and of the Great Miami River, in the floodplain soils, and in off-site groundwater.
In 2010, the PRPs agreed to do a vapor intrusion study to determine whether methane and/or volatile organic carbons are migrating from the landfill and into on-site and nearby buildings. Indoor air, subslab, outdoor air, and soil gas samples were collected several times in 2011 and 2012, and indicate that vapor intrusion and landfill gas migration pose an imminent and substantial endangerment to human health. EPA initiated a removal action in June 2012, and issued an Action Memo in October 2012 requiring active mitigation systems for on-site buildings with completed vapor intrusion pathways, and installation of a perimeter landfill gas system, if necessary. EPA issued a UAO in March 2013 and entered into an AOC with the PRPs in April 2013 to perform the mitigation work. The PRPs installed the mitigation systems and demolished other buildings in summer 2013.
The PRPs submitted draft remedial investigation/feasibility study reports for the site in May 2010 and January 2011, but EPA determined that there was inadequate information on landfill contents and potential off-site migration of contaminated groundwater. EPA is in the process of negotiating a new AOC with the PRPs that would redefine the landfill area and streamline selection and implementation of a remedial action. EPA expects RI/FS work to begin in early 2015 under the new AOC. The RI/FS work will be divided into operable unit 1 (OU1), which is the landfill area, and OU2, which is the contaminated sediment, surface water, soil, and groundwater outside of the landfill property.
Property ReuseMuch of the property is currently used for commercial/light industrial purposes, as land parcels that overlay the landfill were sold off or leased as the former quarry was filled in with waste materials.
ContactsRemedial Project Manager, U.S. EPA
leslie patterson (firstname.lastname@example.org)
Community Involvement Coordinator, U.S. EPA
AliasesSOUTH DAYTON DUMP & LDFL