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Record of Decision System (RODS)

HALBY CHEMICAL CO.

Abstract

Site Name:  HALBY CHEMICAL CO.
Address:  600 TERMINAL AVE 
City & State:  NEW CASTLE  DE  19720
County:  NEW CASTLE
 
EPA ID:  DED980830954
EPA Region:  03
 
NPL Status:  Currently on the Final NPL
 
ROD Type:  Record of Decision
ROD ID:  EPA/ROD/R03-91/115
ROD Date:  06/28/1991
Operable Unit(s):  01
 
Media:  SOIL DEBRIS
 
Contaminant:  VOCS, BENZENE, TCE, TOLUENE, XYLENES, OTHER ORGANICS, PAHS, METALS, ARSENIC, CHROMIUM, LEAD
 
Abstract:  THE 14-ACRE HALBY CHEMICAL SITE ENCOMPASSES A CHEMICAL STORAGE FACILITY AND ASSOCIATED WAREHOUSES IN WILMINGTON, NEW CASTLE COUNTY, DELAWARE. LAND USE IN THE AREA IS PRIMARILY INDUSTRIAL. STORM WATER RUNOFF FROM THE SITE GENERALLY FLOWS TOWARD A DRAINAGE DITCH WHICH DISCHARGES INTO THE CHRISTINA RIVER. FROM 1948 TO 1977, THE HALBY CHEMICAL PLANT PROCESS PLANT AREA WAS USED TO PRODUCE SULFUR COMPOUNDS, AND UNTIL 1969, A PORTION OF THE SITE WAS USED TO STORE ARSENIC-CONTAINING PYRITE ORE. FROM 1948 TO 1964, THE PLANT DISCHARGED ALL LIQUIDS INTO AN ADJACENT MARSH OR LAGOON, WHICH DRAINED INTO THE LOBDELL CANAL BEFORE EMPTYING INTO THE CHRISTINA RIVER. FROM 1964 TO 1975, THE PLANT ACID WASTEWATER WAS DISCHARGED TO THE PUBLIC SEWERS. FROM 1975 TO 1977, THE OWNERS PERIODICALLY DIVERTED THE ACID WASTEWATER FLOW FROM THE COUNTY SEWER SYSTEM TO ITS PILOT PLANT, AND THE TREATED WASTEWATER WAS DISCHARGED TO THE LAGOON. IN JULY OF 1977, THE FACILITY WAS ISSUED A NPDES PERMIT TO DISCHARGE COOLING WATER AND EFFLUENT FROM THE PROCESS PLANT TREATMENT PLANT. THE PLANT THEN CLOSED IN AUGUST 1977. SINCE 1977, BRANDYWINE CHEMICAL COMPANY HAS USED THE SITE TO RECEIVE AND DISTRIBUTE BULK CHEMICALS. AS A RESULT OF CITIZEN COMPLAINTS ABOUT LAGOON OVERFLOW, HYDROGEN SULFIDE-LIKE ODORS, AND NUMEROUS SPILLS, A NUMBER OF INVESTIGATIONS WERE CONDUCTED BY THE STATE AND EPA BEGINNING IN 1983, WHICH IDENTIFIED LEAKING DRUMS AND STAINED SOIL. ANALYSES OF SAMPLES TAKEN DURING THIS SITE INVESTIGATION REVEALED VOCS, ORGANICS, METALS, AND OTHER CARCINOGENIC COMPOUNDS IN THE SOIL. THIS RECORD OF DECISION (ROD) ADDRESSES THE FIRST OF TWO OPERABLE UNITS (OUS) AND PROVIDES A FINAL REMEDY FOR SOIL AND DEBRIS IN THE PROCESS PLANT AREA. CONTAMINATION OF AIR, SURFACE WATER, GROUND WATER, AND SEDIMENT IN THE MARSH AND LAGOON AREAS WILL BE ADDRESSED IN A SUBSEQUENT ROD AS OU2. THE PRIMARY CONTAMINANTS OF CONCERN AFFECTING THE SOIL AND DEBRIS ARE VOCS INCLUDING BENZENE, TCE, TOLUENE, AND XYLENES; OTHER ORGANICS INCLUDING PAHS; AND METALS INCLUDING ARSENIC, CHROMIUM, AND LEAD.

THE SELECTED REMEDIAL ACTION FOR THIS SITE INCLUDES CONSOLIDATING DEBRIS ONSITE OR DISPOSING OF ALL DEBRIS OFFSITE; EXCAVATING AND STABILIZING THE TOP 6 INCHES OF APPROXIMATELY 10,300 CUBIC YARDS OF CONTAMINATED SURFACE SOIL IN THE PROCESS PLANT AREA, FOLLOWED BY REPLACING THE STABILIZED SOIL ONSITE; CAPPING THE APPROXIMATELY 5,800 SQUARE YARDS RESIDUALS AREA WITH AN ASPHALT CAP; CONDUCTING SOIL MONITORING; AND IMPLEMENTING INSTITUTIONAL CONTROLS INCLUDING DEED RESTRICTIONS. THE ESTIMATED PRESENT WORTH COST FOR THIS REMEDIAL ACTION IS $1,586,000, WHICH INCLUDES AN ANNUAL O&M COST OF $43,000.

PERFORMANCE STANDARDS OR GOALS; THE CLEAN-UP GOALS FOR SOIL CONTAMINANTS INCLUDING ARSENIC AND CARCINOGENIC PAHS ARE SET AT BACKGROUND LEVELS. ADDITIONAL SAMPLING AND ANALYSIS IS REQUIRED TO ASCERTAIN BACKGROUND LEVELS; HOWEVER, APPROXIMATE GOALS INCLUDE ARSENIC 10 MG/KG AND CPAHS 1.2 MG/KG.
 
Remedy:  THIS OPERABLE UNIT IS THE FIRST OF TWO OPERABLE UNITS FOR THE HALBY CHEMICAL SITE. OPERABLE UNIT 1 (OU1) FOR THE SITE ADDRESSES THE PRINCIPAL THREAT POSED BY SOIL CONTAMINATION WITHIN THE PROCESS PLANT AREA OF THE SITE. OPERABLE UNIT 2 (OU2) FOR THE SITE WILL ADDRESS CONTAMINATION OF THE AIR, GROUNDWATER, SEDIMENTS IN THE OUTFALL AREA AND TIDAL MARSH AREA, AND SEDIMENTS AND SURFACE WATER WITHIN THE LAGOON AND DRAINAGE DITCH. THE SOIL INSIDE THE PROCESS PLANT AREA (OU1) POSES AN UNACCEPTABLE HEALTH RISK TO WORKERS BECAUSE OF THE POTENTIAL FOR DIRECT CONTACT, INGESTION, OR INHALATION OF CONTAMINATED SOIL. THE SELECTED REMEDY INVOLVES THE EXCAVATION OF THE TOP 6 INCHES OF CONTAMINATED SURFACE SOIL IN THE PROCESS PLANT AREA FOLLOWED BY STABILIZATION AND REPLACEMENT. AN ASPHALT CAP IS TO BE PLACED OVER THE STABILIZED MATERIAL.

THE MAJOR COMPONENTS OF THE SELECTED REMEDY INCLUDES THE FOLLOWING;
* CONSOLIDATE ALL DEBRIS ON-SITE INTO ONE AREA
* PERFORM A SOIL GRID SAMPLING ACTIVITY TO DETERMINE THE EXTENT OF REMEDIATION WITHIN THE PROCESS PLANT AREA
* PERFORM A TREATABILITY STUDY TO IDENTIFY A PROPER STABILIZATION FORMULA
* EXCAVATE THE TOP 6 INCHES OF CONTAMINATED SURFACE SOIL
* STABILIZE EXCAVATED SOIL
* BACKFILL STABILIZED SOIL
* COVER THE STABILIZED SOIL WITH AN ASPHALT CAP
* IMPLEMENT DEED RESTRICTIONS AND PUBLIC EDUCATION PROGRAMS
* PERFORM LONG-TERM MONITORING AND MAINTENANCE.
 
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