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Record of Decision System (RODS)

CHISMAN CREEK

Abstract

Site Name:  CHISMAN CREEK
Address:  WOLF TRAP RD 
City & State:  YORK COUNTY  VA  23692
County:  YORK
 
EPA ID:  VAD980712913
EPA Region:  03
 
NPL Status:  Currently on the Final NPL
 
ROD Type:  Record of Decision
ROD ID:  EPA/ROD/R03-88/044
ROD Date:  03/31/1988
Operable Unit(s):  02
 
Media:  SURFACE WATER
 
Contaminant:  METALS (ARSENIC, CADMIUM, COPPER, LEAD, NICKEL, VANADIUM)
 
Abstract:  THE CHISMAN CREEK SITE IS LOCATED NEAR GRAFTON IN YORK COUNTY, VIRGINIA. THIS ROD ADDRESSES OPERABLE UNIT TWO, WHICH CONSISTS OF THREE PONDS (DESIGNATED A, B, AND C), THE FRESHWATER TRIBUTARY, AND THE CHISMAN CREEK ESTUARY. THE SITE IS LOCATED WITHIN THE WATERSHED OF CHISMAN CREEK, A TRIBUTARY OF THE CHESAPEAKE BAY. APPROXIMATELY 500 TO 1,000 PEOPLE LIVE WITHIN ONE MILE OF THE SITE. BETWEEN 1957 AND 1974, FLY ASH FROM THE VIRGINIA POWER YORKTOWN POWER GENERATING STATION WAS DISPOSED OF IN FOUR ABANDONED SAND AND GRAVEL BORROW PITS LOCATED APPROXIMATELY TWO MILES SOUTH OF THE GENERATING STATION. THE FLY ASH DISPOSAL AREAS, DESIGNATED AREAS A, B, C, AND D, BECAME KNOWN AS THE CHISMAN CREEK SUPERFUND SITE. BETWEEN 1971 AND 1973, ALL FLY ASH IN AREA D WAS REMOVED AND DEPOSITED IN AREA C. AREA D WAS REPORTEDLY FILLED WITH CONSTRUCTION RUBBLE GENERATED DURING THE CONSTRUCTION OF PUBLIC UTILITIES IN THE AREA AT THAT TIME. AFTER A DOMESTIC WELL SHOWED DISCOLORED WATER IN 1980, THE VIRGINIA STATE WATER CONTROL BOARD (SWCB) AND VIRGINIA STATE BOARD OF HEALTH SAMPLED RESIDENTIAL GROUND WATER IN THE VICINITY OF THE FLY ASH AREAS TO DETERMINE THE TYPES AND CONCENTRATIONS OF CONTAMINANTS PRESENT. THE VIRGINIA INSTITUTE OF MARINE SCIENCE AND SWCB CONDUCTED ADDITIONAL STUDIES TO DETERMINE THE NATURE AND EXTENT OF AREA CONTAMINATION. THE FIRST OPERABLE UNIT ROD WAS SIGNED IN SEPTEMBER 1986. THE REMEDIAL ACTION, BEGUN IN NOVEMBER 1987, INCLUDES; PLACING A SOIL COVER ON TWO AREAS AND A CLAY CAP ON A THIRD AREA; RELOCATING A PORTION OF THE TRIBUTARY; PROVIDING AN ALTERNATE WATER SUPPLY FOR RESIDENTIAL AREAS; AND POST-CLOSURE MONITORING. AT THE REQUEST OF EPA, THE U.S. FISH AND WILDLIFE SERVICE CONDUCTED THE SECOND OPERABLE UNIT REMEDIAL INVESTIGATION TO EVALUATE THE IMPACT OF CONTAMINANTS AT THE SITE ON FISH AND WILDLIFE RESOURCES AND THEIR HABITAT. CHEMICAL ANALYSIS OF THE PHYSICAL ENVIRONMENT AND BIOTA OF THE SITE FOR OPERABLE UNIT TWO FOCUSED ON EIGHT METALS. THESE WERE ARSENIC, CADMIUM, COPPER, LEAD, NICKEL AND VANADIUM. BIOASSAYS SHOWED THE SURFACE WATER QUALITY IN PONDS B AND C TO BE BELOW ARAR LEVELS, AND SEDIMENT FROM THE CHISMAN CREEK ESTUARY TO HAVE NO ADVERSE IMPACTS FROM THE CONTAMINANTS. FISH FROM THE FRESHWATER PONDS AND OYSTERS FROM CHISMAN CREEK HAVE NOT BEEN IMPACTED. HUMAN HEALTH RISKS FROM CONSUMPTION OF FISH AND OYSTERS, OR ACCIDENTAL INGESTION OF SURFACE WATER AND SEDIMENTS ARE ALL WITHIN EPA GUIDELINES FOR ACCEPTABLE RISKS. THE PRIMARY CONTAMINANTS OF CONCERN AFFECTING SURFACE WATER IN AREA A INCLUDE NICKEL AND VANADIUM.

THE SELECTED REMEDIAL ACTION FOR THIS SITE INCLUDES; DIVERSION OF SURFACE RUNOFF FROM AREA A (COVERED WITH SOIL IN OPERABLE UNIT ONE) INTO POND A, AND WATER QUALITY MONITORING TO EVALUATE THE EFFECTIVENESS OF BOTH OPERABLE UNITS. THE ESTIMATED PRESENT WORTH COST FOR THIS REMEDIAL ACTION IS $137,000.
 
Remedy:  OPERABLE UNIT TWO CONSISTS OF THREE PONDS (DESIGNATED A, B, AND C), THE FRESHWATER TRIBUTARY, AND THE CHISMAN CREEK ESTUARY. AT THE REQUEST OF EPA, THE U.S. FISH AND WILDLIFE SERVICE CONDUCTED THE OPERABLE UNIT TWO REMEDIAL INVESTIGATION TO EVALUATE THE IMPACT OF CONTAMINANTS AT THE SITE ON FISH AND WILDLIFE RESOURCES AND THEIR HABITAT.

THE RECORD OF DECISION FOR OPERABLE UNIT ONE WAS SIGNED ON SEPTEMBER 30, 1986 AND REMEDIAL ACTION BEGAN IN NOVEMBER, 1987. SPECIFIC ACTIONS INCLUDE; PLACING A SOIL COVER ON TWO AREAS AND A CLAY CAP ON A THIRD AREA; INSTALLING A SUBSURFACE DRAIN SYSTEM AND TREATING THE GROUND WATER; RELOCATING A PORTION OF THE TRIBUTARY; PROVIDING AN ALTERNATE WATER SUPPLY FOR RESIDENTIAL AREAS; AND POST CLOSURE MONITORING. OPERABLE UNIT ONE REMEDIAL ACTION IS SCHEDULED TO BE COMPLETE IN DECEMBER, 1988.

THE SELECTED REMEDY FOR OPERABLE UNIT TWO, SURFACE DRAINAGE MODIFICATION NEAR POND A, RECOMMENDS DIVERTING SURFACE RUNOFF FROM AREA A INTO POND A WHICH DISCHARGES TO THE FRESHWATER TRIBUTARY AT THE OUTLET OF POND A. THIS ALTERNATIVE ALSO INCLUDES A WATER QUALITY MONITORING PROGRAM FOR EACH OF THE PONDS TO EVALUATE THE EFFECTIVENESS OF THE REMEDIAL MEASURES IMPLEMENTED BY OPERABLE UNITS ONE AND TWO.

THE NO ACTION ALTERNATIVE WAS CHOSEN FOR THE TRIBUTARY AND THE ESTUARY, HOWEVER, EACH ALTERNATIVE INCLUDES A WATER QUALITY MONITORING PROGRAM. THE MONITORING PROGRAM FOR THE PONDS, THE TRIBUTARY, AND THE ESTUARY WILL BE FURTHER DEVELOPED DURING THE REMEDIAL DESIGN AND MAY INCLUDE, BUT NOT BE LIMITED TO, WATER QUALITY ANALYSIS, SEDIMENT QUALITY ANALYSIS, AND "TRIGGER VALUES" FOR BOTH WATER AND SEDIMENT THAT WILL DETERMINE THE APPROPRIATENESS OF ADDITIONAL BIOASSAYS.
 
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