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Record of Decision System (RODS)

MIDCO II

Abstract

Site Name:  MIDCO II
Address:  5900 INDUSTRIAL HIGHWAY 
City & State:  GARY  IN  46406
County:  LAKE
 
EPA ID:  IND980679559
EPA Region:  05
 
NPL Status:  Currently on the Final NPL
 
ROD Type:  Record of Decision
ROD ID:  EPA/ROD/R05-89/093
ROD Date:  06/30/1989
Operable Unit(s):  01
 
Media:  SOIL SEDIMENT GROUNDWATER
 
Contaminant:  VOCS, BENZENE, TOLUENE, TCE, XYLENES, PCBS, ARSENIC, CHROMIUM, LEAD
 
Abstract:  THE MIDCO II SITE IS A SEVEN-ACRE STORAGE AND DISPOSAL FACILITY IN GARY, INDIANA. THE SURROUNDING AREA IS PREDOMINANTLY USED FOR INDUSTRIAL PURPOSES, AND INCLUDES 34 OTHER POTENTIAL HAZARDOUS WASTE SITES. THE UNDERLYING AQUIFER IS HIGHLY SUSCEPTIBLE TO CONTAMINATION FROM SURFACE SOURCES BECAUSE OF THE HIGH WATER TABLE; HOWEVER, IN THE VICINITY OF THE SITE, THE AQUIFER IS USED PRIMARILY FOR NON-DRINKING WATER PURPOSES. THE SAME OPERATOR AS AT ANOTHER SUPERFUND SITE, MIDCO I, BEGAN WASTE OPERATIONS, INCLUDING DRUM STORAGE AT MIDCO II DURING THE SUMMER OF 1976. FOLLOWING A MAJOR FIRE AT THE MIDCO I SITE IN JANUARY 1977, MIDCO TRANSFERRED THE OPERATIONS FROM THE MIDCO I SITE TO THE MIDCO II SITE. OPERATIONS INCLUDED TEMPORARILY STORING BULK LIQUID AND DRUM WASTES; NEUTRALIZING ACIDS AND CAUSTICS; AND DISPOSING OF WASTES BY DUMPING WASTES INTO ONSITE PITS, WHICH ALLOWED WASTES TO PERCOLATE INTO THE GROUND WATER. ONE OF THESE PITS, THE FILTER PIT, HAD AN OVERFLOW PIPE LEADING INTO A DITCH, WHICH DRAINED INTO THE NEARBY GRAND CALUMENT RIVER. BY APRIL 1977 APPROXIMATELY 12,000 TO 15,000 55-GALLON DRUMS OF WASTE MATERIALS WERE STORED ONSITE. ADDITIONALLY, AN ESTIMATED TEN BADLY DETERIORATED AND LEAKING TANKS WERE HOLDING WASTES INCLUDING OILS, OIL SLUDGES, CHLORINATED SOLVENTS, PAINT SOLVENTS, PAINT SLUDGES, ACIDS, AND SPENT CYANIDES. IN AUGUST 1977 A FIRE AT THE SITE DESTROYED 50,000 TO 60,000 DRUMS. ALTHOUGH MOST DRUMS WERE BADLY DAMAGED A SUBSTANTIAL NUMBER OF DRUMS, INCLUDING 75 TO 100 DRUMS CONTAINING CYANIDE, SURVIVED THE FIRE. EPA CONDUCTED A PRELIMINARY INVESTIGATION RESULTING IN THE INSTALLATION OF A 10-FOOT HIGH FENCE AROUND THE SITE. IN 1984 AND 1985 EPA CONDUCTED EMERGENCY REMOVAL ACTIVITIES INCLUDING REPAIRING AND EXTENDING THE SITE FENCE; REMOVING MOST OF THE REMAINING DRUMS, TANKS, AND DEBRIS FROM THE SITE'S SURFACE; AND REMOVING THE SLUDGE PITS AND FILTER PIT CONTENTS. THE RESULTING PCB-CONTAMINATED SOIL PILE WAS REMOVED AND DISPOSED OF IN AN OFFSITE HAZARDOUS WASTE LANDFILL IN EARLY 1986, AND MOST OF THE CYANIDE-CONTAMINATED PILE WAS ALSO REMOVED. REMOVAL ACTIVITIES ENDED IN JANUARY 1986. THE PRIMARY CONTAMINANTS OF CONCERN CURRENTLY AFFECTING THE SOIL, SEDIMENT, AND GROUND WATER ARE VOCS INCLUDING BENZENE, TOLUENE, TCE, AND XYLENES; OTHER ORGANICS INCLUDING PCBS; AND METALS INCLUDING ARSENIC, CHROMIUM, AND LEAD.

THE SELECTED REMEDIAL ACTION FOR THIS SITE INCLUDES EXCAVATION AND TREATMENT OF 35,000 YD3 OF CONTAMINATED SOIL AND WASTE MATERIALS USING SOLIDIFICATION/STABILIZATION FOLLOWED BY ONSITE DISPOSAL; EXCAVATION AND ONSITE SOLIDIFICATION/STABILIZATION OF 500 YD3 OF CONTAMINATED SEDIMENT; COVERING THE SITE IN ACCORDANCE WITH RCRA LANDFILL CLOSURE REQUIREMENTS; GROUND WATER PUMPING AND DEEP WELL INJECTION IN A CLASS I WELL IF EPA GRANTS A PETITION TO ALLOW LAND DISPOSAL OF WASTE PROHIBITED UNDER RCRA; IF A PETITION IS NOT APPROVED, GROUND WATER WILL BE TREATED USING AIR STRIPPING AND A LIQUID PHASE GRANULAR ACTIVATED CARBON POLISH SYSTEM TO MEET EPA REQUIREMENTS (LDR TREATMENT STANDARDS), FOLLOWED BY DEEP WELL INJECTION OR REINJECTION INTO THE AQUIFER; GROUND WATER MONITORING; AND IMPLEMENTING DEED AND ACCESS RESTRICTIONS. THE GROUND WATER TREATMENT AND UNDERGROUND INJECTION PORTIONS OF THE REMEDIAL ACTION MAY BE COMBINED WITH THE REMEDIAL ACTION FOR MIDCO I. THE ESTIMATED PRESENT WORTH COST FOR THE REMEDIAL ACTION IS $18,596,400, WHICH INCLUDES ANNUAL O&M COST OF $733,000, IF GROUND WATER IS TREATED; OR $14,419,000, WHICH INCLUDES ANNUAL O&M COSTS OF $301,000, IF GROUND WATER IS NOT TREATED.
 
Remedy:  THIS IS THE FINAL REMEDIAL ACTION FOR THE MIDCO II. A SURFACE REMOVAL ACTION INCLUDING REMOVAL AND OFF-SITE DISPOSAL OF WASTES IN DRUMS AND SUB-SURFACE MATERIALS IN THE FORMER SLUDGE PIT AND FILTER BED HAS BEEN COMPLETED BY US EPA. THE FINAL REMEDIAL ACTION WILL TREAT THE HIGHLY CONTAMINATED SUBSURFACE SOILS AND MATERIALS THAT REMAIN AT THE SITE AND THAT ARE CONTRIBUTING TO GROUND WATER AND SURFACE WATER CONTAMINATION NEAR THE SITE, AND WILL TREAT THE HIGHLY CONTAMINATED GROUND WATER NEAR THE SITE. THESE ACTIONS WILL ADDRESS THE PRINCIPAL THREATS POSED BY THE SITE WHICH INCLUDE PUBLIC HEALTH RISKS DUE TO FUTURE DEVELOPMENT OF THE SITE, PUBLIC HEALTH RISKS DUE TO OFF-SITE MIGRATION OF GROUND WATER, ENVIRONMENTAL IMPACTS ON THE DITCH NORTHEAST OF THE SITE AND DOWN-STREAM WETLANDS.

THE MAJOR COMPONENTS OF THE SELECTED REMEDIAL ACTIONS INCLUDE:

* ON-SITE TREATMENT OF AN ESTIMATED 35,000 CUBIC YARDS OF CONTAMINATED SOIL AND WASTE MATERIAL BY SOLIDIFICATION STABILIZATION FOLLOWED BY ON-SITE DEPOSITION OF THE SOLIDIFIED MATERIAL. THE SOLIDIFICATION/STABILIZATION OPERATION WILL BE CONSIDERED SUCCESSFUL IF IT REDUCES THE MOBILITY OF CONTAMINANTS SO THAT LEACHATE FROM THE SOLID MASS WILL NOT CAUSE EXCEEDANCE OF HEALTH BASED LEVELS IN THE GROUND WATER.

* EXCAVATION AND ON-SITE SOLIDIFICATION STABILIZATION OF APPROXIMATELY 500 CUBIC YARDS OF CONTAMINATED SEDIMENTS IN THE DITCH ADJACENT TO THE NORTHEAST BOUNDARY OF THE SITE,

* INSTALLATION AND OPERATION OF A GROUND WATER PUMPING SYSTEM TO INTERCEPT CONTAMINATED GROUND WATER FROM THE SITE;

* INSTALLATION AND OPERATION OF A DEEP, CLASS I, UNDERGROUND INJECTION WELL FOR DISPOSAL OF THE CONTAMINATED GROUND WATER; OF IF A NO-MIGRATION DEMONSTRATION IS DISAPPROVED BY US EPA, INSTALLATION AND OPERATION OF A TREATMENT SYSTEM FOR THE CONTAMINATED GROUND WATER TO REMOVE HAZARDOUS SUBSTANCES FOLLOWED BY DEEP WELL INJECTION OF THE SALT CONTAMINATED WATER; OR INSTALLATION AND OPERATION OF A TREATMENT SYSTEM FOR THE CONTAMINATED GROUND WATER TO REMOVE HAZARDOUS SUBSTANCES FOLLOWED BY REINJECTION OF THE SALT CONTAMINATED GROUND WATER INTO THE CALUMET AQUIFER IN A MANNER THAT WILL PREVENT SPREADING OF THE SALT PLUME.

* INSTALLATION OF A CONDUIT IN THE DITCH ALONG THE SITE AND A FINAL SITE COVER SATISFYING RCRA CLOSURE REQUIREMENTS, IF APPLICABLE OR IF CONSIDERED RELEVANT AND APPROPRIATE (THE QUALITY OF CAP REQUIRED WILL DEPEND ON THE RESULTS OF TESTS ON THE SOLIDIFED MATERIAL;

* RESTRICTION OF SITE ACCESS AND IMPOSITION OF DEED RESTRICTIONS AS APPROPRIATE;

* RELATED TESTING AND LONG TERM MONITORING.

THE GROUNDWATER TREATMENT AND UNDERGROUND INJECTION PORTIONS OF THE REMEDIAL ACTION MAY BE COMBINED WITH THE REMEDIAL ACTION FOR MIDCO I. IN THIS CASE, THE COMBINED TREATMENT CONSTITUTES AN ON-SITE ACTION, FOR PURPOSES OF THE OFF-SITE POLICY AND FOR COMPLIANCE WITH THE REQUIREMENTS OF THE RESOURCE CONSERVATION AND RECOVERY ACT.
 
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