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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/R03-86/030
ROD Date:  09/30/1986
Operable Unit(s):  01
 
Media:  GROUNDWATER SOIL SEDIMENTS SURFACE WATER WETLANDS
 
Contaminant:  INORGANICS, TRACE METALS (NICKEL AND VANADIUM)
 
Abstract:  THE CHISMAN CREEK SITE, LOCATED IN SOUTHEASTERN YORK COUNTY, VA, IS IN A 520-ACRE SUB-WATERSHED OF THE CHISMAN CREEK COASTAL BASIN ON THE VIRGINIA PENINSULA. AS A TIDAL ESTUARY, CHISMAN CREEK FLOWS EASTERLY INTO CHESAPEAKE BAY. APPROXIMATELY 500 TO 1,000 PEOPLE LIVE WITHIN ONE MILE OF THE SITE IN THIS PRIMARILY RESIDENTIAL AREA. CHISMAN CREEK SUPPORTS PRIVATE AND COMMERCIAL MARINAS AND NUMEROUS PRIVATE DOCKS, AND IS ALSO A POPULAR FISHING AREA. IN 1957 AND 1958, TWO UNITS OF THE VIRGINIA POWER YORKTOWN POWER GENERATING STATION BEGAN BURNING COAL MIXED WITH COKE FROM A NEARBY PETROLEUM REFINERY. FLY ASH WAS PRODUCED BY THESE UNITS UNTIL 1974. A PRIVATE CONTRACTOR, EMPLOYED BETWEEN 1957 AND 1974 TO HAUL THE FLY ASH FROM THE GENERATING STATION, DISPOSED OF LARGE QUANTITIES OF THIS INCINERATED COAL BY-PRODUCT IN FOUR ABANDONED SAND AND GRAVEL PITS IN THE CHISMAN CREEK WATERSHED, APPROXIMATELY TWO MILES SOUTH OF THE GENERATING STATION. NO DUST CONTROL MEASURES WERE EMPLOYED DURING THE HAULING, AND UNCONTROLLED EROSION CAUSED FLY ASH TO WASH FROM THE PITS INTO CHISMAN CREEK AND ITS TRIBUTARIES DURING HEAVY RAINS. THE REMEDIAL INVESTIGATION CONDUCTED AT THE SITE FOUND CONTAMINANTS IN THE FLY ASH, THE SEDIMENTS OF CHISMAN CREEK AND ITS TRIBUTARIES, THE GROUND WATER WITHIN AND ADJACENT TO THE PITS, AND IN SURFACE WATER. THE PRIMARY CONTAMINANTS OF CONCERN INCLUDE; TRACE METALS (NICKEL AND VANADIUM), AND INORGANICS.

THE SELECTED REMEDIAL ACTION INCLUDES; CAPPING AREAS A AND B WITH A SOIL LAYER OVERLAID WITH TOPSOIL AND VEGETATIVE GROWTH; CAPPING AREA C WITH A LOW-PERMEABILITY COMPACTED SOIL LAYER OVERLAID WITH TOPSOIL AND VEGETATIVE GROWTH; INSTALLATION OF A SURFACE DRAIN ON THE WEST, SOUTH, AND EAST SIDES OF AREA C TO LOWER THE WATER TABLE BELOW THE BOTTOM OF THE FLY ASH; TRANSPORTATION OF GROUND WATER DRAINAGE FROM AREA C TO AN ONSITE TREATMENT PLANT; EXTENSION OF THE NEWPORT NEWS AND THE ALLEN MILL ROAD WATERLINES TO AFFECTED HOMES; IMPLEMENTATION OF DEED RESTRICTIONS OR OTHER CONTROLS TO PROHIBIT EXCAVATION OF SOIL AND RESTRICT ONSITE BUILDING AND GROUND WATER USE. THE ESTIMATED CAPITAL COST FOR THIS REMEDY IS $14,119,000 WITH O&M COSTS FOR YEAR ONE OF $506,000 AND $64,000 FOR YEARS 2-30.
 
Remedy:  1. AREAS A AND B - THESE FLY ASH PITS WILL BE CAPPED WITH A SOIL LAYER OVERLAID WITH TOPSOIL AND VEGETATIVE GROWTH TO PREVENT DIRECT CONTACT WITH THE FLY ASH AND TO MINIMIZE EROSION OF THE FLY ASH.

2. AREA C - THIS FLY ASH PIT WILL BE CAPPED WITH A LOW-PERMEABILITY COVER OVERLAID WITH TOPSOIL AND VEGETATIVE GROWTH. A SUBSURFACE DRAIN WILL BE INSTALLED ON THE WEST, SOUTH, AND EAST SIDES OF THE FLY ASH PIT IN ORDER TO LOWER THE WATER TABLE BELOW THE BOTTOM OF THE FLY ASH. CONTAMINATED GROUND WATER COLLECTED FROM THE FLY ASH DURING THE INITIAL DRAWDOWN PERIOD WILL BE CONVEYED TO AN ONSITE TREATMENT PLANT. ONCE THE GROUND WATER BEING COLLECTED THROUGH THE DRAIN IS SHOWN TO MEET NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM (NPDES) LIMITS, THE TREATMENT WILL CEASE.

3. ALTERNATIVE WATER SUPPLY - THE HOMES ALONG WOLF TRAP ROAD WILL BE CONNECTED TO THE EXISTING NEWPORT NEWS WATERLINE AND THE HOMES ALONG ALLENS MILL ROAD WILL BE SERVED BY EXTENDING THE EXISTING WATERLINE TO ALLENS MILL ROAD. DURING THE DESIGN OF THE REMEDIAL ALTERNATIVES, A SURVEY OF THE EXISTING WATER SUPPLIES WILL BE CONDUCTED. THE SURVEY WILL DETERMINE THE NUMBER OF HOMEOWNERS CURRENTLY USING THE TABB OR YORKTOWN FORMATIONS FOR DRINKING WATER AND THE CORRESPONDING NUMBER OF CONNECTIONS TO THE ALTERNATE WATER SUPPLY LINES.

4. LAND USE CONTROLS - EPA WILL ATTEMPT TO OBTAIN DEED RESTRICTIONS OR OTHER CONTROLS ON THE USE OF THE FLY ASH PITS AND IMMEDIATELY ADJACENT AREAS. THESE RESTRICTIONS SHOULD PROHIBIT EXCAVATION OF SOIL AND RESTRICT BUILDING ONSITE. THESE CONTROLS SHOULD ALSO INCLUDE RESTRICTIONS ON GROUND WATER USE IN THE PITS AND DOWN GRADIENT OF THE FLY ASH PITS.

5. MONITORING - POST-CLOSURE MONITORING PROGRAM FOR THE GROUND WATER AND SURFACE WATER WILL BE DESIGNED AND IMPLEMENTED.
 
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