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Record of Decision System (RODS)

DIXIE CAVERNS COUNTY LANDFILL

Abstract

Site Name:  DIXIE CAVERNS COUNTY LANDFILL
Address:  RTE 778 
City & State:  SALEM  VA  24153
County:  ROANOKE
 
EPA ID:  VAD980552095
EPA Region:  03
 
NPL Status:  Deleted from the Final NPL
 
ROD Type:  Record of Decision
ROD ID:  EPA/ROD/R03-91/133
ROD Date:  09/30/1991
Operable Unit(s):  01
 
Media:  DEBRIS
 
Contaminant:  METALS, LEAD, CADMIUM, ZINC
 
Abstract:  THE 39-ACRE DIXIE CAVERNS COUNTY LANDFILL IS A FORMER MUNICIPAL LANDFILL IN ROANOKE COUNTY, VIRGINIA. THE SURROUNDING LAND IS RURAL, WITH THE NEAREST RESIDENCE LOCATED 1/2 MILE FROM THE SITE. THE SITE IS SITUATED ON A STEEP RIDGE BETWEEN TWO VALLEYS SURROUNDED BY HEAVILY FORESTED MOUNTAINS TRAVERSED BY SMALL STREAMS. TWO UNNAMED HEADWATER STREAMS RECEIVE SURFACE RUNOFF FROM THE SITE, AND DISCHARGE TO THE ROANOKE RIVER, WHICH IS LOCATED 2 MILES SOUTH/SOUTHEAST. THE LANDFILL IS CURRENTLY OWNED AND WAS OPERATED BY THE COUNTY OF ROANOKE FROM 1965 UNTIL ITS CLOSURE IN 1976. DURING OPERATION, DIXIE CAVERNS LANDFILL ACCEPTED AN ESTIMATED 440,000 CUBIC YARDS OF MUNICIPAL AND INDUSTRIAL WASTES INCLUDING REFUSE, SCRAP METAL, FLYASH, AND SLUDGE. IN 1983, EPA INVESTIGATIONS IDENTIFIED SEVERAL DISPOSAL AREAS INCLUDING A DISCARDED DRUM AREA, A SLUDGE PIT, AND A LARGE FLYASH PILE, WHICH CONTAINED ELEVATED LEVELS OF METALS. IN 1987, EPA CONDUCTED A REMOVAL ACTION THAT ADDRESSED THE DRUM AND SLUDGE AREAS; HOWEVER, REMOVAL OF THE FLYASH WAS SUSPENDED ON EPA'S RECOMMENDATION. IN 1987, THE COUNTY DEVELOPED A REMOVAL WORK PLAN PROPOSING A PROPRIETARY STABILIZATION PROCESS TO TREAT THE FLYASH, AND THE PLAN WAS APPROVED IN 1988 WITH REMEDIATION LEVELS SET BY EPA. QUESTIONS CONCERNING THE REGULATORY STATUS OF THE WASTE CAUSED DELAY IN IMPLEMENTING THE WORK PLAN. AT THAT TIME, EPA RECOMMENDED SUSPENSION OF FURTHER REMOVAL ACTIVITY PERTAINING TO THE FLYASH BECAUSE OF UNCERTAINTY AS TO WHETHER OR NOT THE COUNTY'S PLAN WOULD MEET FEDERAL AND STATE REQUIREMENTS. THIS RECORD OF DECISION (ROD) ADDRESSES THE FLYASH AT THE SITE AS OPERABLE UNIT 1 (OU1). FUTURE RODS WILL ADDRESS OTHER REMEDIAL ACTIONS BASED ON RI/FS INVESTIGATIONS. THE PRIMARY CONTAMINANTS OF CONCERN AFFECTING THE DEBRIS ARE METALS INCLUDING LEAD, CADMIUM, AND ZINC.

THE SELECTED REMEDIAL ACTION FOR THIS INTERIM REMEDY INCLUDES EXCAVATING AND TRANSPORTING APPROXIMATELY 9,000 CUBIC YARDS OF FLYASH OFFSITE TO AN EPA APPROVED HIGH TEMPERATURE METALS RECOVERY TECHNOLOGY FACILITY FOR TREATMENT AND SUBSEQUENT REUSE; AND IMPLEMENTING STATE DUST AND EROSION AND SEDIMENT CONTROLS DURING FLYASH EXCAVATION. THE PRESENT WORTH COST FOR THE REMEDIAL ACTION IS $3,927,158. THERE ARE NO O&M COSTS ASSOCIATED WITH THIS REMEDIAL ACTION.

PERFORMANCE STANDARDS OR GOALS; CHEMICAL-SPECIFIC FLYASH CLEAN-UP GOALS ARE BASED ON ONSITE DISPOSAL CRITERIA DEVELOPED BY EPA DURING THE RECENT K061 LDR RULING, AND INCLUDE LEAD 0.095 MG/KG AND CADMIUM 0.032 MG/KG.
 
Remedy:  THIS IS THE FIRST PLANNED RESPONSE ACTION FOR THE SITE. THIS INTERIM REMEDY ADDRESSES ONLY THE FLYASH PILE LOCATED ON THE SITE. THE FLYASH REPRESENTS A PRINCIPAL THREAT TO HUMAN HEALTH REQUIRING TREATMENT. SUBSEQUENT RESPONSE ACTIONS MAY TAKE PLACE TO ADDRESS THE REST OF THE SITE.

THE SELECTED REMEDY INCLUDES THE FOLLOWING MAJOR COMPONENTS;
* EXCAVATION OF APPROXIMATELY 9000 YD3 OF FLYASH MATERIAL AT THE SITE;
* TRANSPORTATION OF APPROXIMATELY 9000 YD3 FLYASH OFF-SITE FOR TREATMENT USING THE HIGH TEMPERATURE METALS RECOVERY (HTMR) PROCESS;
* TREATMENT OF THE FLYASH AT AN EPA APPROVED HTMR FACILITY TO ACHIEVE THE TREATMENT STANDARDS FOR HO 61 WASTE SPECIFIED IN 56 FED. REG.41164-41178; AND
* IMPLEMENTATION OF DUST CONTROLS AND EROSION AND SEDIMENTATION CONTROLS DURING FLYASH EXCAVATION.
 
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