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Record of Decision System (RODS)

MIDCO I

Abstract

Site Name:  MIDCO I
Address:  7400 W 15TH AVE 
City & State:  GARY  IN  46401
County:  LAKE
 
EPA ID:  IND980615421
EPA Region:  05
 
NPL Status:  Currently on the Final NPL
 
ROD Type:  Record of Decision
ROD ID:  EPA/ROD/R05-89/092
ROD Date:  06/30/1989
Operable Unit(s):  01
 
Media:  SOIL SEDIMENT GROUNDWATER
 
Contaminant:  VOCS, BENZENE, TOLUENE, TCE, PCBS, PAHS, PHENOLS, CHROMIUM, LEAD
 
Abstract:  THE MIDCO I SITE IS A FOUR-ACRE, ABANDONED INDUSTRIAL WASTE RECYCLING, STORAGE, AND DISPOSAL FACILITY IN GARY, INDIANA. THE SURROUNDING AREA IS PARTIALLY RURAL, INCLUDING WETLANDS. RESIDENTIAL NEIGHBORHOODS LIE TO THE WEST, SOUTH, AND EAST, WITH SOME RESIDENTS LIVING AS CLOSE AS 900 FEET FROM THE SITE. TWELVE DRINKING WATER WELLS HAVE BEEN IDENTIFIED WITHIN APPROXIMATELY ONE MILE OF THE SITE. THE CALUMET AQUIFER, ONE OF THE TWO MAJOR AQUIFERS UNDERLYING THE SITE AND PROVIDING WATER TO THESE WELLS, IS HIGHLY SUSCEPTIBLE TO CONTAMINATION FROM SURFACE SOURCES. RECYCLING, STORING, AND DISPOSING OF INDUSTRIAL WASTES BEGAN AT THE SITE SOMETIME BEFORE JUNE 1973. WITHIN A THREE-YEAR PERIOD, THE SITE OWNERS ACCEPTED AND STOCKPILED APPROXIMATELY 6,000-7,000 55-GALLON DRUMS CONTAINING BULK LIQUID WASTE, AND 4 BULK TANKS, EACH 4,000-10,000 GALLONS. THE FACILITY CLOSED IN DECEMBER 1976 AFTER A FIRE BURNED APPROXIMATELY 14,000 DRUMS OF CHEMICAL WASTE. OPERATIONS RESUMED IN OCTOBER 1977 UNDER NEW OWNERSHIP. BY FEBRUARY 1979 THE NEW OWNERS ABANDONED THE FACILITY, LEAVING THOUSANDS OF DRUMS AND WASTE CHEMICALS UNATTENDED. BY JANUARY 1980 AN ESTIMATED 14,000 DRUMS WERE STILL STOCKPILED ONSITE. IN JUNE 1981 SEVERE FLOODING CAUSED WATER IN THE AREA TO DRAIN WEST INTO A NEIGHBORING CITY; CONTACT WITH THE FLOOD WATER REPORTEDLY RESULTED IN SKIN BURNS. IN 1982 EPA INITIATED A SURFACE REMOVAL ACTION WHICH INCLUDED REMOVING EXTENSIVE SURFACE WASTES, AN UNDERGROUND TANK, AND THE TOP ONE FOOT OF CONTAMINATED SOIL. BECAUSE THESE ACTIVITIES DID NOT ADDRESS THE CONTAMINATED SUBSURFACE SOIL, SEDIMENT, AND GROUND WATER, EPA HAS INITIATED THIS FIRST REMEDIAL ACTION TO ADDRESS THE ABOVE-REFERENCED CONTAMINATED MEDIA. THE PRIMARY CONTAMINANTS OF CONCERN AFFECTING THE SOIL, SEDIMENT, AND GROUND WATER ARE VOCS INCLUDING BENZENE, TOLUENE, AND TCE; OTHER ORGANICS INCLUDING PCBS, PHENOLS, AND PAHS; AND METALS INCLUDING CHROMIUM AND LEAD.

THE SELECTED REMEDIAL ACTION FOR THIS SITE INCLUDES EXCAVATION AND TREATMENT OF 12,400 YD3 OF CONTAMINATED SOIL AND SUBSURFACE MATERIALS USING A COMBINATION OF VAPOR EXTRACTION AND SOLIDIFICATION STABILIZATION, FOLLOWED BY ONSITE DISPOSAL; EXCAVATION AND ONSITE SOLIDIFICATION STABILIZATION OF APPROXIMATELY 1,200 YD3 OF CONTAMINATED SEDIMENT IN SURROUNDING WETLANDS; 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 IMPLEMENTATION OF DEED AND ACCESS RESTRICTIONS. THE ESTIMATED PRESENT WORTH COST FOR THIS REMEDIAL ACTION IS $13,989,000, WHICH INCLUDES ANNUAL O&M COSTS OF $525,000, IF GROUND WATER IS TREATED; OR $10,728,000, WHICH INCLUDES ANNUAL O&M COSTS OF $188,000, IF GROUND WATER IS NOT TREATED.
 
Remedy:  THIS IS THE FINAL REMEDIAL ACTION FOR THE MIDCO I. A SURFACE REMOVAL ACTION INCLUDING REMOVAL AND OFF-SITE DISPOSAL OF WASTES IN DRUMS AND SUB-SURFACE TANKS AND THE TOP ONE FOOT OF CONTAMINATED SOIL WAS COMPLETED IN 1982. 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 AND, PUBLIC RISKS DUE TO AIR EMISSIONS, AND ENVIRONMENTAL IMPACTS ON SURROUNDING WETLANDS.

THE MAJOR COMPONENTS OF THE SELECTED REMEDIAL ACTIONS INCLUDE:

* ON-SITE TREATMENT OF AN ESTIMATED 12,400 CUBIC YARDS OF CONTAMINATED SOIL AND WASTE MATERIAL BY A COMBINATION OF VAPOR EXTRACTION AND SOLIDIFICATION/STABILIZATION FOLLOWED BY ON-SITE DEPOSITION OF THE SOLIDIFIED MATERIAL. THE SOIL VAPOR EXTRACTION SYSTEM WILL BE CONSIDERED SUCCESSFUL WHEN VOLATILE ORGANIC COMPOUNDS ARE REDUCED TO LEVELS THAT WILL POSE NO HEALTH THREAT AND ALLOW SOLIDIFICATION/STABILIZATION TO PROCEED SUCCESSFULLY. THE SOLIDIFICATION/STABILIZATION OPERATION WILL BE CONSIDERED SUCCESSFUL WHEN 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 1200 CUBIC YARDS OF CONTAMINATED SEDIMENTS IN SURROUNDING WETLANDS;

* 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; OR IF A NO-MIGRATION PETITION 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 FINAL SITE COVER SATISFYING RCRA CLOSURE REQUIREMENTS, IF APPLICABLE OR IF CONSIDERED RELEVANT AND APPROPRIATE (THE QUALITY OF CAP REQUIRED WILL ALSO DEPEND ON THE RESULTS OF TESTS ON THE SOLIDIFIED 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 II. IN THIS CASE, THE COMBINED TREATMENT CONSTITUTES AN ON-SITE ACTION, FOR PURPOSES OF THE OFF-SITE POLICY.
 
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