Site Name: CARDINGTON ROAD LDFL AKA SANITARY LDFL

EPA ID: OHD093895787 EPA Region: 05 Metro Statistical Area: 2000

1855 CARDINGTON RD, DAYTON, OH 45409

Operable Unit: 01

ROD ID: EPA/ROD/R05-93/232 ROD Date: 09/27/93

Contaminant: VOC, Other Organics, Metals

Keys: Air; Air Monitoring; Arsenic; Benzene; Capping; Carbon Adsorption (GAC); Carcinogenic Compounds; Chromium; Clean Air Act; Closure Requirements; Debris; Deferred Decision; Direct Contact; Ground Water Monitoring; Incineration/Thermal Destruction; Institutional Controls; Lead; MCLs; Metals; O&M; Onsite Containment; Onsite Treatment; Organics; RCRA; Safe Drinking Water Act; Sediment; Soil; Sole-Source Aquifer; Solvents; State Standards/ Regulations; Surface Water; Surface Water Collection/Diversion; Surface Water Monitoring; Toluene; Treatment Technology; Venting; VOCs; Xylenes

Abstract:

The 36-acre Cardington Road Landfill a.k.a. Sanitary Landfill site is part of the 53-acre Cardington Road Landfill located in Moraine, Montgomery County, Ohio. Land use in the area is mixed commercial, light industrial, and residential. The site borders residential properties to the northeast, with the closest residence within 200 yards of the landfill property. The landfill is located above a kame terrace in the Great Miami River valley buried aquifer system, which has been designated as a sole-source aquifer. All area residents are provided with municipal drinking water, and there are nine commercial production wells within the study area. Throughout the 1960s, the site was mined primarily for sand and gravel, although some landfill activities may have occurred. Beginning in 1971, the site was operated as a solid waste disposal facility, and the excavated sand and gravel pits were filled with commercial, industrial, and municipal waste. In 1980, after waste disposal activities terminated, the site was covered with soil ranging in thickness from two to eight feet. In 1987, EPA and the State conducted a RI, which revealed that adverse environmental impacts were the result of prior onsite solid waste and hazardous waste disposal practices. This ROD addresses a first and final action for the landfill source material and gas to prevent them from migrating offsite. The primary contaminants of concern affecting the soil, sediment, debris, surface water, and landfill gas are VOCs, including benzene, TCE, toluene, and xylenes; other organics; and metals, including arsenic, chromium, and lead. SELECTED REMEDIAL ACTION: The selected remedial action for this site includes capping the entire landfill area with a low permeability vegetated cap; actively collecting landfill gases and treating them using flaring, thermal destruction, or carbon adsorption, with subsequent release into the atmosphere or collection and sale of the gases to a local utility, if determined feasible; installing additional gas controls and gas collection trenches along the eastern/northeastern boundary, if necessary; conducting a Supplemental Site Investigation to further define ground water flow directions and to determine whether the contamination found at the southern end of the landfill is coming from the landfill or from another source; implementing surface water runoff and engineering controls, including site grading, diversion berms, storm water drainage channels, collection systems, and energy dissipation controls; monitoring ground water, surface water, landfill gas emissions, and air; and implementing institutional controls, including deed, ground water, and land use restrictions. The estimated present worth cost for this remedial action is $8,145,300, which includes an estimated total O&M cost of $2,125,900 for 30 years. PERFORMANCE STANDARDS OR GOALS: Collection, treatment, or flaring of landfill gas will be in compliance with chemical-specific ARARs of the Clean Air Act and the APEN Air Pollution Emission Notice. INSTITUTIONAL CONTROLS: Deed, ground water, and land use restrictions will be implemented to restrict access to and limit future use of the site, as well as to prevent use of ground water beneath the site as drinking water.

Remedy:

This is the first and only operable unit for the site. The selected remedial alternative for the Sanitary Landfill Company (IWD) site is to perform active landfill gas collection and treatment, cover the landfill with a low permeability cap and undertake other actions required by State sanitary landfill closure requirements. The major components of the selected remedial alternative are:

- Solid Waste Landfill Cap

- On-site Subsurface Gas Controls

- Surface Run-off Controls

- Long-term Monitoring

- Institutional Controls

- Supplemental Site Investigation

The following components will be further evaluated during the Remedial Design (RD) and Remedial Action (RA) and, if necessary, will be included as part of the remedy.

- Natural attenuation of Contaminated Ground Water

- Ground Water Extraction and Treatment