Site Name: MURRAY-OHIO DUMP
EPA ID: TND980728836 EPA Region: 04 Metro Statistical Area:
GLENN SPRINGS RD, LAWRENCEBURG, TN 38464
Operable Unit: 01
ROD ID: EPA/ROD/R04-94/210 ROD Date: 06/17/94
Contaminant: metals
Keys: paint and plating sludge landfill, groundwater, soil, covers, fencing, monitoring
Abstract:
Please note that the text in this document summarizes the Record of Decision for the purposes of facilitating searching and retrieving key text on the ROD. It is not the officially approved abstract drafted by the EPA Regional offices. Once EPA Headquarters receives the official abstract, this text will be replaced.
The Murray Ohio Dump is located three miles southwest of Lawrenceberg, Tennessee. The site consists of two landfill areas, covering about 0.25 and 27 acres, respectively. The smaller, 0.25-acre area to the northwest is known as the 1973 disposal area. The western portion of the larger 27-acre landfill is known as the pre-1973 disposal area. An area immediately to the north and downgradient of the larger area is
known as the overland flow area since wastes flowed from the site over the surface to this area. In general, the water table is approximately 40 to 50 feet below the land's surface and is Class II.
Murray Ohio Manufacturing Company (Murray Ohio) began disposing of paint and plating sludge on-site in 1963 and continued until 1982. The smaller .25 acre landfill was used for a brief period during 1973 to 1974. The company placed its liquid wastes and sludges containing chromium, nickel, and zinc in open trenches to facilitate dewatering. After the materials dewatered, the trenches were backfilled. Approximately 3,000 cubic yards of solid wastes were landfilled and covered between 1973 and 1982. The quantity of liquid wastes landfilled is unknown. There are several ephemeral streams located around the site. All streams empty into Shoal Creek, the major collection point in the area. The U.S. Bureau of the Census has estimated 1994 population of Lawrenceberg at 10,718 persons, and that of Lawrence County at 36,435 persons. Land immediately surrounding the Site is considered residential.
In March 1979, EPA conducted a site investigation at the landfill. Analysis of the samples showed elevated concentrations of chromium and nickel in both the water and soil at the base of the slope below the landfill used by Murray Ohio.
In November 1991, the Tennessee Department of Environment and Conservation (TDEC) required that a groundwater monitoring system be installed at the Site to comply with Tennessee hazardous waste regulations. Sampling from the wells began in September 1982. Murray ceased disposal at the site in December 1982. Based on its Hazardous Ranking System score of 46.44, the Site was listed in September 1983 on EPA's National Priorities List (NPL).
This Record of Decision (ROD) for the Murray-Ohio Dump (O.U.1) will address all known soil and groundwater/seep concerns at the Site. During the development of the EPA RI, areas of concern were delineated for metal contamination in soil immediately surrounding the disposal areas caused by surface water runoff. Downward migration of metal contaminants into the upper aquifer had also occurred.
This ROD will address the entire Site with regards to threats to human health and the environment posed by the Site, as indicated by the risk assessment included in the February 1993 RI report and revised by the EPA in the February 1994 FS report. The principle method of remedy and hazard abatement will be the containment of contaminated soil by capping the source and thus preventing the infiltration of water into the waste.
Remedy:
The selected remedy includes constructing an enhanced single barrier cover system over the pre-1973 disposal area; slope stabilization of the post-1973 disposal area with improvements on the existing cover; constructing a durable surface cover over the 1973 disposal area; constructing a single barrier cover system over the Overland Flow Area; deed restrictions and fencing around the disposal areas; continued maintenance of the cover systems; site monitoring; contingent construction of a seep collection and treatment system with discharge of treated effluent to Shoal Creek or a water treatment facility. The treatment system would be accomplished through chromium reduction, precipitation, coagulation/flocculation, and gravity clarification. Capping is expected to reduce infiltration, thereby allowing natural attenuation processes to act in reducing contaminant levels.