Site Name: POWELL ROAD LDFL
EPA ID: OHD000382663 EPA Region: 05 Metro Statistical Area: 2000
SO SIDE OF POWELL RD 1MI W 202, DAYTON, OH 45424
Operable Unit: 01
ROD ID: EPA/ROD/R05-93/244 ROD Date: 09/30/93
Contaminant: VOCs, Other Organics, Metals
Keys: Air Stripping; Arsenic; Benzene; Capping; Carbon Adsorption (GAC); Carcinogenic Compounds; Chromium; Clean Air Act; Clean Water Act; Debris; Direct Contact; Excavation; Floodplain; Ground Water; Ground Water Monitoring; Ground Water Treatment; Institutional Controls; Leachate Collection/Treatment; Lead; MCLGs; MCLs; Metals; O&M; Offsite Disposal; Onsite Containment; Onsite Discharge; Onsite Disposal; Onsite Treatment; Organics; PAHs; PCBs; PCE; Pesticides; Phenols; RCRA; Safe Drinking Act; Soil; Sole-Source Aquifer; Solvents; State Standards/Regulations; TCE; Toluene; Toxic Substances Control Act; VOCs; Xylenes.
Abstract:
The 70-acre Powell Road Landfill site is a former gravel pit and landfill located in Huber Heights, Montgomery County, Ohio. Land use in the area is mixed agricultural, industrial, recreational, and residential. The site borders the Great Miami River, an intermittent stream, woodlands, and residential housing. Site features include the Great Miami River floodplain; the Great Miami River buried valley aquifer, which is a sole- source aquifer that is divided into the shallow and primary aquifers; and a 36-acre landfill. Nearby residents use both private wells, installed in the primary aquifer, and municipal wells to obtain their drinking water. In 1959, the site was converted from a gravel pit into a landfill that operated under several owners. Commercial, industrial, and nonhazardous domestic waste was disposed of in the landfill during site operations. Degradation of this waste resulted in a release of hazardous substances to onsite media. It also is believed that improper disposal of certain types of industrial waste occurred at the landfill, including ink waste, paint sludge, strontium chromate, and benzidine. In 1984, landfilling operations ceased. Also in 1984, State investigations identified onsite ground water contamination and
requested EPA assistance to assess site threats. Initial EPA investigations of 46 residential wells identified low levels of VOC contamination in 6 of the wells. Subsequent sampling identified additional contamination by VOCs, other organics, metals, and other inorganics migrating from the landfill. In 1985, the landfill was capped and seeded. This ROD addresses a first and final action for source and ground water contamination. The primary contaminants of concern affecting the soil, debris, ground water, landfill gas, and leachate are VOCs, including benzene, PCE, TCE, toluene, and xylenes; other organics, including PAHs, PCBs, pesticides, and phenols; and metals, including arsenic, chromium, and lead.
SELECTED REMEDIAL ACTION: The selected remedial action for this site includes excavating and consolidating approximately 600 yd[3] of contaminated soil and debris under an upgraded landfill cap; extracting and treating contaminated ground water from the shallow aquifer onsite using a system to be determined during the RD phase, followed by offsite discharge of treated effluent; allowing ground water from the primary aquifer to naturally attenuate; collecting and treating contaminated landfill gas onsite by flaring, with discharge of treated residuals to the atmosphere; extracting and treating contaminated leachate from the landfill onsite using biological treatment to remove organics and metals, followed by air stripping and granular activated carbon to remove VOCs and SVOCs, as determined during the RD phase; discharging the treated effluent offsite to surface water; monitoring ground water; implementing engineering controls, such as flood protection and storm water controls; and implementing institutional controls, including deed restrictions and site access restrictions, such as fencing. The estimated present worth cost for this remedial action is $20,510,000, which includes an estimated annual O&M cost of $544,000.
PERFORMANCE STANDARDS OR GOALS: Soil, debris, ground water, landfill gas, and leachate cleanup goals are based on chemical- specific ARARs or a risk-based level of 10[-4] or less. Soil and debris cleanup goals include Aroclor 1016 0.3-61 mg/kg; Aroclor 1254 36-59 mg/kg; benzo(a)anthracene 0.05-5 mg/kg; benzo(a)pyrene 0.05-5 mg/kg; benzo(b)fluoranthene 0.05-5 mg/kg; benzo(k)fluoranthene 0.05-5 mg/kg; beryllium 0.1-10 mg/kg; chrysene 0.05-5 mg/kg; 4,4-DDT 2-200 mg/kg; dibenzo(a,h)anthracene 0.05-5 mg/kg; and indeno(1,2,3-cd)pyrene 0.05-5 mg/kg. Ground water cleanup goals are based on SDWA MCLs and MCLGs, and include aluminum 50-200 ug/l; antimony 0.015 mg/l; arsenic 0.000040.004 mg/l; benzo(a)anthracene 0.000007-0.0007 mg/l; beryllium 0.000020.002 mg/l; chrysene 0.000007-0.0007 mg/l; lead 15-50 ug/l; TCE 0.25-25 ug/l; and vinyl chloride 0.00004-0.004 mg/l. Landfill gas cleanup goals include benzene 0.12-12 ug/l and vinyl chloride 0.012-12 ug/l.
INSTITUTIONAL CONTROLS: Institutional controls, including deed restrictions and warning signs, will be implemented onsite to limit site access, maintain the integrity of the cap, and preclude future development of the site.
Remedy:
The remedial action will be a final site-wide remedy. The selected remedial action addresses the sources of the contamination by containment of the landfill and contaminated soils and treatment of leachate and ground water. The major components of the selected remedial action for the Powell Road Landfill are:
* institutional controls
* improved landfill cap with liner
* excavation of contaminated soils
* consolidation of soils under landfill cap
* ground water monitoring
* flood protection
* storm water controls
* active landfill gas collection with flare
* leachate extraction
* on-site leachate treatment
* extraction of ground water from the shallow aquifer adjacent to the landfill
* on-site ground water treatment
* discharge of treated ground water and leachate to river
The selected remedial action will address the principal threats posed by the Site.