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Record of Decision System (RODS)



Address:  MT FALLS 
City & State:  FREDERICK COUNTY  VA  22601
EPA ID:  VAD980831796
EPA Region:  03
NPL Status:  Deleted from the Final NPL
ROD Type:  Record of Decision
ROD ID:  EPA/ROD/R03-92/160
ROD Date:  09/29/1992
Operable Unit(s):  02
Media:  Soil, Sediment, Debris, Surface Water
Contaminant:  Metals
Abstract:  SITE HISTORY/DESCRIPTION: The Rhinehart Tire Fire Dump site is located in a 22-acre drainage area of a sparsely populated rural area in western Frederick County, Virginia. Surface water runoff flows into a north -south tributary that discharges to Hogue Creek, which is 4,000 feet downstream. Bedrock is noted to be highly fractured, and the ground water flow in the overburden aquifer is toward Massey Run. From 1972 to 1983, the site owner conducted a tire disposal operation, which consisted oftransporting discarded tires from various locations and storing them on a 5- acre wooded slope behind his home. An estimated 5 to 7 million tires that had been accumulated caught on fire in October 1983 and burned until July 1984. As a result of the fire, a free-flowing oily-tar, which contained anthracene, benzene, cadmium, chromium, ethylbenzene, napthalene, nickel, pyrene, toluene, and zinc, began to seep out of the tire pile into Massey Run and on to Hogue Creek. In late 1983, EPA's emergency response team constructed asecondary lined containment basin, known as "Dutchman's Pond,"downslope of the fire area to contain water generated by the early fire- fighting efforts and oil products from the burning tires. The oily-tar waste stream exhibited properties similar to heating oil; therefore, approximately 800,000 gallons could be collected, removed offsite, and recycled into fuel oils. EPA directed the site owner to construct ditches and dikes for drainage control. In 1984, ground water studies by EPA concluded that ground water contamination was limited to the Massey Run drainage basin. A 1988 ROD addressed the migration of contaminants offsite via surface water runoff, as OU1, and included construction of an onsite wastewater treatment plant. This ROD provides for an early remedial action for the soil, sediment, debris, and surface water associated with the onsite containment basin known as "Dutchman's Ponds" as OU2. A future ROD will address OU3, which includes the remainder of site contamination, and sludge generated from the treatment processes. The primary contaminants of concern affecting the soil, sediment, debris, and surface water are metals,including arsenic, lead, and zinc. PERFORMANCE STANDARDS OR GOALS: Chemical- specific soil excavation goals are based on background and aquatic toxicity levels and include zinc 50 mg/kg. Chemical-specific surface water discharge limits are based on state standards and include aluminum 87 ug/l; arsenic 360 ug/l; copper 9.2 ug/l; iron 1,000 ug/l; lead 34 ug/l; nickel 1,100 ug/l; silver 0.12 ug/l; and zinc 180 ug/l. INSTITUTIONAL CONTROLS: Not provided.
Remedy:  SELECTED REMEDIAL ACTION: The selected remedial action for this site includes excavating approximately 1,125 cubic yards of contaminated soil with zinc concentrations greater than 50 mg/kg from the pond area; sampling, excavating, and dewatering pond sediment using solidification with a solid reagent; testing the soil and sediment for hazardous characteristics and transporting these offsite for appropriate disposal; removing the synthetic liner within the pond, with offsite disposal; treating approximately 200,000 gallons of contaminated surface water from the pond using the existing oil/water separator; directing the water to Rhinehart's Pond for treatment in the existing wastewater treatment plant using chemical precipitation and filtration to remove solids, with discharge of the treated water onsite to Massey Run; backfilling Dutchman's Pond, and any surrounding soil that may be excavated with clean soil; and implementing soil erosion controls. The estimated present worth cost for this remedial action is $1,300,000, which includes an estimated annual O&M cost of $12,000 for 2 years.
Text:  View full-text ROD [ 38K ]
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