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Record of Decision System (RODS)

NEW CASTLE STEEL

Abstract

Site Name:  NEW CASTLE STEEL
Address:  9TH & WASHINGTON STREET 
City & State:  NEW CASTLE  DE  19720
County:  NEW CASTLE
 
EPA ID:  DED980705255
EPA Region:  03
 
NPL Status:  Deleted from the Final NPL
 
ROD Type:  Record of Decision
ROD ID:  EPA/ROD/R03-88/046
ROD Date:  03/31/1988
Operable Unit(s):  01
 
Media:  SURFACEWATER
 
Contaminant:  METALS, ARSENIC, CADMIUM, CHROMIUM, LEAD, NICKEL
 
Abstract:  THE NEW CASTLE STEEL SITE (NCS) IS A 3-ACRE DISPOSAL DUMP, LOCATED IN NEW CASTLE, DELAWARE. THE SITE IS DIVIDED INTO TWO PARTS BY A CITY DRAINAGE CHANNEL. ONE PORTION OF THE SITE, THE INACTIVE DISPOSAL AREA, OCCUPIES 1.3 ACRES, AND THE ACTIVE AREA OCCUPIES 1.7 ACRES. SINCE OPERATIONS BEGAN IN 1907, SOLID WASTE GENERATED BY THE DEEMER STEEL COMPANY (DSC), LOCATED IMMEDIATELY ACROSS THE NCS SITE, WAS PILED AND PERIODICALLY SPREAD OVER THE SURFACE OF THE DISPOSAL AREAS. THE WASTE CONSISTED PRIMARILY OF BLACK SAND WHICH MAY CONTAIN SMALL QUANTITIES OF BENTONITE AND CORN FLOUR. APPROXIMATELY, 1,800 YD3 OR 2,430 TONS OF BLACK SAND WERE GENERATED EACH YEAR. OTHER WASTE MATERIALS WERE SENT TO THE DISPOSAL AREAS AND MIXED WITH BLACK SAND. THESE MATERIALS INCLUDED; SLAG, COKE, IRON OXIDE, FINE SAND DUST, AND METAL SCRAP. BETWEEN 1973 AND 1980, ELECTRIC FURNACE DUST WAS GENERATED AT THE RATE OF 9.6 TONS PER YEAR. THIS DUST WAS MIXED WITH BLACK SAND AND SPREAD OVER THE ACTIVE WASTE AREA. THE ADOPTION OF THE DELAWARE REGULATIONS GOVERNING HAZARDOUS WASTE IN NOVEMBER 1980 IDENTIFIED THE ELECTRIC FURNACE DUST AND ANY MIXTURE OF THIS MATERIAL WITH SOLID WASTE AS A RCRA LISTED HAZARDOUS WASTE (WASTE NUMBER K061). EPA SUBSEQUENTLY CHANGED THE DEFINITION OF K061, AND NONE OF THE WASTE FROM DSC OPERATIONS WOULD QUALIFY AS A LISTED HAZARDOUS WASTE. IN DECEMBER 1980, THE ELECTRIC FURNACE DUST WAS FOUND TO BE EP-TOXIC FOR CADMIUM, CHROMIUM, AND LEAD. A JUNE 1984 HYDROGEOLOGICAL STUDY REPORTED THE THICKNESS OF WASTES IN THE FILL SECTION RANGED FROM 8 TO 13 FEET, AND THE AVERAGE THICKNESS WAS APPROXIMATELY 10 FEET. WASTES WERE PLACED OVER PREDOMINANTLY UNCONSOLIDATED MARSH SEDIMENTS, WHICH ARE UNDERLAIN BY APPROXIMATELY 50 FEET OF LOW-PERMEABILITY CLAYS. THE UPPERMOST POTOMAC AQUIFER, AN IMPORTANT DRINKING WATER SOURCE, LIES ABOUT 70 FEET BELOW THE SITE, AND IS PROTECTED BY THE LOW-PERMEABILITY CLAYS. AN ENDANGERMENT ASSESSMENT (EA) WAS PREPARED BASED ON THE DATA COLLECTED FROM THE SAMPLES IN JANUARY 1987. THE EPA CONCLUDED THAT NO SIGNIFICANT RISK TO HUMAN HEALTH AND THE ENVIRONMENT COULD BE ATTRIBUTED TO THE SITE. CONTAMINANT SCREENING IDENTIFIED FIVE INDICATOR CHEMICALS. THEY INCLUDE; ARSENIC, CADMIUM, CHROMIUM, LEAD, AND NICKEL.


THE SELECTED REMEDIAL ACTION FOR THIS SITE IS NO FURTHER ACTION. EPA WILL MONITOR SURFACE WASTES FOR LEAD UNTIL THE SITE IS DELETED FROM THE NATIONAL PRIORITIES LIST (NPL) AND CLOSED UNDER THE STATE CLOSURE LAW. THERE IS NO CAPITAL COST OR O&M ASSOCIATED WITH THIS REMEDIAL ACTION.
 
Remedy:  BASED ON THE CURRENT CONDITIONS AT THE NEW CASTLE STEEL SITE, I HAVE DETERMINED THAT NO SIGNIFICANT RISK OR THREAT TO PUBLIC HEALTH EXISTS. THEREFORE, I HAVE DETERMINED THAT NO FURTHER REMEDIAL ACTIONS UNDER CERCLA ARE REQUIRED.

EPA WILL CONTINUE TO PERIODICALLY MONITOR SITE CONDITIONS UNTIL THE SITE IS EITHER DELETED FROM THE NPL OR CLOSED UNDER THE STATE OF DELAWARE SOLID WASTE DISPOSAL REGULATIONS AND MONITORING IS INCLUDED AS PART OF THE SITE CLOSURE PLAN.
 
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