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Record of Decision System (RODS)

NEW CASTLE SPILL

Abstract

Site Name:  NEW CASTLE SPILL
Address:  900 WILMINGTON ROAD 
City & State:  NEW CASTLE  DE  197203638
County:  NEW CASTLE
 
EPA ID:  DED058980442
EPA Region:  03
 
NPL Status:  Deleted from the Final NPL
 
ROD Type:  Record of Decision
ROD ID:  EPA/ROD/R03-89/077
ROD Date:  09/28/1989
Operable Unit(s):  01
 
Media:  SEDIMENT GROUNDWATER SURFACEWATER
 
Contaminant:  (2-CHLOROPROPYL)PHOSPHATE
 
Abstract:  THE NEW CASTLE SPILL SITE IS A FORMER MANUFACTURING FACILITY 0.5 MILE NORTH OF NEW CASTLE, DELAWARE, AND IS IN THE 100-YEAR FLOODPLAIN OF THE DELAWARE RIVER. COMMERCIAL ENTERPRISES AND RESIDENCES NEIGHBOR THE SITE AND RECEIVE POTABLE WATER FROM THE DEEPER OF THE TWO AQUIFERS UNDERLYING THE SITE. THE SIX-ACRE AREA ASSOCIATED WITH THE SITE CONSISTS OF MUNICIPAL PROPERTY, WETLANDS, AND THE WITCO MANUFACTURING FACILITY WHICH PRODUCED PLASTIC FOAMS USING (2-CHLOROPROPYL)-PHOSPHATE. IN 1977, BECAUSE OF DEAD GRASS NEAR THE FACILITY'S DRUM STORAGE AREA, WITCO INVESTIGATED THE AREA AND DETERMINED THAT FOUR TO FIVE DRUMS OF TRIS HAD SPILLED AND CONTAMINATED THE SOIL AND THE SHALLOW AQUIFER. THE STATE SUBSEQUENTLY PUMPED AND DISCHARGED CONTAMINATED GROUND WATER INTO ADJACENT WETLANDS. A 1988 REMEDIAL INVESTIGATION REVEALED THAT THERE IS NO LONGER A SOURCE OF CONTAMINATION AT THE SITE AND THAT TRIS HAS CONTAMINATED THE SHALLOW AQUIFER BUT NOT THE DEEPER AQUIFER. THIS LIMITED RESPONSE ACTION ADDRESSES THE GROUND WATER CONTAMINATION IN THE SHALLOW AQUIFER. THE PRIMARY CONTAMINANT OF CONCERN AFFECTING THE GROUND WATER IS (2-CHLOROPROPYL)-PHOSPHATE.

THE SELECTED REMEDIAL ACTION FOR THIS SITE INCLUDES NATURAL ATTENUATION AS THE TREATMENT OF THE PRINCIPAL THREAT TO GROUND WATER; GROUND WATER, SURFACE WATER, AND SEDIMENT MONITORING; AND IMPLEMENTATION OF INSTITUTIONAL CONTROLS. THE ESTIMATED PRESENT WORTH COST FOR THIS REMEDIAL ACTION IS $466,147, WHICH INCLUDES O&M COSTS OF $25,000.
 
Remedy:  NEW CASTLE SPILL SITE HAS ONE OPERABLE UNIT: GROUNDWATER CONTAMINATED WITH TRIS IN THE COLUMBIA AQUIFER. THIS OPERABLE UNIT NO LONGER HAS A SOURCE OF CONTAMINATION BUT REQUIRES A GROUNDWATER RESPONSE ACTION TO ADDRESS THE POTENTIAL THREATS POSED BY THE CONTAMINATED GROUNDWATER. THE UNDERLYING POTOMAC AQUIFER SEPARATED BY A CONFINING LAYER FROM THE COLUMBIA AQUIFER IS NOT CONTAMINATED. THE REMEDY SELECTED FOR THE SITE IS LIMITED ACTION, WHICH IS MONITORING AND INSTITUTIONAL RESTRICTIONS. IN UTILIZING THIS REMEDY, THE PRINCIPAL THREAT AT THE SITE IS NOT PHYSICALLY TREATED, BUT IS ALLOWED TO BE CLEANSED THROUGH NATURAL ATTENUATION.

THE MAJOR COMPONENTS OF THE SELECTED REMEDY INCLUDE;

* MONITORING THE COLUMBIA AQUIFER ON A QUARTERLY BASIS FOR TRIS TO ENSURE THE EFFECTIVENESS OF THE NATURAL ATTENUATION PROCESS.
* MONITORING THE POTOMAC AQUIFER ON AN ANNUAL BASIS FOR TRIS TO ENSURE THAT CONTAMINATION HAS NOT OCCURRED IN THE POTOMAC AQUIFER.
* MONITORING THE SURFACE WATER OF THE WETLANDS ADJACENT TO THE SITE ON AN ANNUAL BASIS FOR TRIS. RESAMPLE IN THE NEXT QUARTER IF AN ANOMALY OCCURS IN THE RESULTS. FURTHER EVALUATION AND BIOASSAY TESTING IF THE TRIGGER VALUE OF 100 UG/L TRIS IS REACHED.
* MONITORING THE SEDIMENTS OF THE WETLANDS ADJACENT TO THE SITE ON AN ANNUAL BASIS FOR TRIS. RESAMPLE IN THE NEXT QUARTER IF AN ANOMALY OCCURS IN THE RESULTS. FURTHER EVALUATION AND BIOASSAY TESTING IF THE TRIGGER VALUE OF 1000 UG/KG TRIS IS REACHED.
* INSTITUTIONAL RESTRICTIONS ON THE PLACEMENT OF WELLS IN THE COLUMBIA AQUIFER IN THE VICINITY OF THE SITE.
* A FIVE YEAR EFFECTIVENESS REVIEW TO RE-EVALUATE THE SITE.
 
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