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Record of Decision System (RODS)

U.S. TITANIUM

Abstract

Site Name:  U.S. TITANIUM
Address:  RTE 151 
City & State:  PINEY RIVER  VA  22964
County:  NELSON
 
EPA ID:  VAD980705404
EPA Region:  03
 
NPL Status:  Currently on the Final NPL
 
ROD Type:  Record of Decision
ROD ID:  EPA/ROD/R03-90/083
ROD Date:  11/21/1989
Operable Unit(s):  01
 
Media:  SOIL GROUND WATER SURFACE WATER
 
Contaminant:  ARSENIC, CHROMIUM, OTHER INORGANICS, ACIDS
 
Abstract:  THE 175-ACRE US TITANIUM SITE, IN NELSON COUNTY, VIRGINIA, IS A FORMER TITANIUM DIOXIDE MANUFACTURING PLANT WHICH WAS OPERATED FROM 1931 TO 1971. THE FACILITY HAS HAD A SUCCESSION OF OWNERS AND IS CURRENTLY OWNED BY U.S. TITANIUM CORPORATION. APPROXIMATELY 50 ACRES OF THE SITE WILL BE ADDRESSED BY THIS REMEDIAL ACTION, INCLUDING SEVEN WASTE STORAGE AREAS CONTAINING PROCESS WASTES. THESE SEVEN AREAS INCLUDE; AREA 1, A BURIAL PIT CONTAINING 16,000 CUBIC YARDS OF SOLID FERROUS SULFATE (COPPERAS); AREA 2, A FORMER COPPERAS STOCKPILE AREA; AREA 3, AN EVAPORATION POND; AREA 4, A 1-ACRE ORE WASTE PILE; AREA 5, SEDIMENTATION PONDS CONTAINING FINE-GRAINED SEDIMENT COMPOSED OF UNREACTED ORE, FILTER CAKE, AND GYPSUM; AREA 6, A SETTLING POND USED TO RECOVER PHOSPHATE ORE; AND AREA 7, A DRAINAGE AREA WHICH RECEIVED SURFACE WATER RUNOFF. SEVERAL OF THESE AREAS LIE WITHIN THE 100-YEAR FLOODPLAIN OF THE NEARBY PINEY RIVER. AFTER A LARGE FISH KILL IN 1979, THE STATE ORDERED US TITANIUM TO BURY THE COPPERAS WASTE FROM AREA 2 BY DECEMBER 1980. THE COPPERAS WASTE WAS COLLECTED AND BURIED IN AREA 1, THE ONSITE BURIAL PIT. A SUPPLEMENTAL REMEDIAL INVESTIGATION REVEALED THE PRESENCE OF ACIDIFIED SOIL UNDERLYING THE WASTE STORAGE AREAS WHICH CONTRIBUTES TO GROUND WATER CONTAMINATION. THE PRIMARY CONTAMINANTS OF CONCERN AFFECTING THE SOIL, GROUND WATER, AND SURFACE WATER ARE METALS INCLUDING ARSENIC AND CHROMIUM, AND OTHER INORGANICS INCLUDING ACIDS.

THE SELECTED REMEDIAL ACTIVITIES FOR THE SEVEN AREAS WITHIN THIS SITE INCLUDE; AREA 1, IN-SITU DISSOLUTION OF COPPERAS WASTE AND TREATMENT OF RESULTING LEACHATE USING PHYSICAL AND CHEMICAL PROCESSES; AREAS 2, 3, 4, AND 5, DIVERSION OF SURFACE WATER FLOW USING DRAINAGE CONTROLS FOLLOWED BY REVEGETATION; AND AREA 7, EXCAVATION AND NEUTRALIZATION OF ACIDIFIED SOIL, FOLLOWED BY PLACEMENT OF THE MIXED MATERIAL AROUND A WETLAND THAT WILL BE CONSTRUCTED ONSITE. AREA 6 REQUIRES NO REMEDIAL ACTION. GROUNDWATER WILL BE COLLECTED PASSIVELY USING SUBSURFACE DRAINS AND TRENCHES AND TREATED PASSIVELY IN AN OXIDATION/SETTLING POND, A CONSTRUCTED WETLAND, AND A LIMESTONE NEUTRALIZATION BED. THE OXIDATION/SETTLING POND WILL BE CAPABLE OF COMPLETELY REMOVING IRON AND SULFUR ELEMENTS FROM THE COLLECTED GROUND WATER AND WILL MAKE UP FOR ANY LOSS IN THE PERFORMANCE OF THE WETLAND. WETLAND VEGETATION AND ANAEROBIC BACTERIA WILL REMOVE IRON AND SULFUR SPECIES FROM THE WATER. AS A RESULT OF THIS PROCESS, AN INCREASE IN PH CAN BE EXPECTED. THE LIMESTONE BED WILL ACT AS A FINAL POLISHING STEP FOR PH ADJUSTMENT BEFORE THE EFFLUENT IS DISCHARGED TO THE PINEY RIVER. THE ESTIMATED PRESENT WORTH COST FOR THIS REMEDIAL ACTION IS $5,895,000, WHICH INCLUDES PRESENT WORTH O&M COSTS FOR 30 YEARS.

PERFORMANCE STANDARDS OR GOALS: ACTION LEVELS FOR IN-SITU DISSOLUTION AND LEACHATE COLLECTION FOR AREA 1 WILL ENSURE THAT LEACHING OF CONTAMINANTS TO GROUND AND SURFACE WATERS WILL NOT EXCEED STATE WATER QUALITY STANDARDS WHICH INCLUDE ARSENIC 0.19 MG/L AND CHROMIUM 0.011 MG/L. EFFLUENT LIMITS FOR DISCHARGE FROM THE GROUND WATER TREATMENT SYSTEM INTO THE SURFACE WATER INCLUDES IRON 97,583 MG/L AND PH RANGING FROM 6.0 TO 9.0.
 
Remedy:  THIS ACTION ADDRESSES ALL KNOWN SOURCES OF CONTAMINATION AT THE SITE, SPECIFICALLY ACIDIC DISCHARGE TO THE PINEY RIVER. THE REMEDY INCLUDES ELIMINATION OF BURIED COPPERAS WASTE, AND REMEDIATION OF CONTAMINATED GROUNDWATER.

THE MAJOR COMPONENTS OF THE SELECTED REMEDY INCLUDE;

* DISSOLVING THE BURIED COPPERAS WASTE IN PLACE AND TREATING THE GENERATED LEACHATE ABOVEGROUND;
* STABILIZING OTHER AREAS OF THE SITE BY IMPLEMENTING DRAINAGE CONTROLS AND ESTABLISHING VEGETATIVE COVERS;
* COLLECTING GROUNDWATER AT THE BOTTOM OF THE SLOPE AND TREATING IT USING A COMBINATION OF CHEMICAL AND BIOLOGICAL (WETLAND) PROCESSES;
* LIMING OF ACIDIFIED SOIL IN AREAS ASSOCIATED WITH THE IMPLEMENTATION OF GROUNDWATER TREATMENT;
* DIVERTING SURFACE RUN-OFF FROM GROUNDWATER TREATMENT AREAS AND FORMER SEDIMENTATION PONDS;
* INSTALLING 100-YEAR FLOOD PROTECTION AROUND THE FORMER SEDIMENTATION PONDS AND GROUNDWATER TREATMENT AREAS;
* INSTALLING SECURITY FENCES AROUND WASTE AND GROUNDWATER TREATMENT AREAS; AND
* CONDUCTING ENVIRONMENTAL MONITORING TO ENSURE THE EFFECTIVENESS OF THE REMEDIAL ACTION.
 
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