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Record of Decision System (RODS)

NINTH AVENUE DUMP

Abstract

Site Name:  NINTH AVENUE DUMP
Address:  7357 W NINTH AVE 
City & State:  GARY  IN  46402
County:  LAKE
 
EPA ID:  IND980794432
EPA Region:  05
 
NPL Status:  Currently on the Final NPL
 
ROD Type:  Record of Decision
ROD ID:  EPA/ROD/R05-89/095
ROD Date:  06/30/1989
Operable Unit(s):  02
 
Media:  SOIL SEDIMENT GROUNDWATER FILL MATERIAL
 
Contaminant:  VOCS, BENZENE, TCE, TOULENE, PAHS, PCBS, LEAD
 
Abstract:  THE NINTH AVENUE DUMP IS A 17-ACRE, INACTIVE CHEMICAL AND INDUSTRIAL WASTE DISPOSAL SITE IN GARY, INDIANA. THERE IS INDUSTRIAL, COMMERICAL, AND RESIDENTIAL DEVELOPMENT IN THE SURROUNDING AREA. THERE ARE APPROXIMATELY 60 INDUSTRIAL AND RESIDENTIAL WATER SUPPLY WELLS WITHIN 1 MILE OF THE SITE. INTERCONNECTING PONDS AND WETLANDS AREAS BORDER THE WASTE DISPOSAL AREAS INTO THE NORTH, WEST, AND SOUTH. THE WETLANDS AREAS TO THE EAST AND TO THE SOUTH OF THE SITE ARE RELATIVELY UNDISTURBED. HAZARDOUS WASTE DISPOSAL OCCURRED AT THE SITE FROM THE EARLY TO MID-1970S, WITH SOME FILLING ASSOCIATED WITH CLEANUP ACTIVITIES CONTINUING UNTIL 1980. INDUSTRIAL, CONSTRUCTION, DEMOLITION, AND CHEMICAL WASTES WERE ACCEPTED AT THE SITE. SPECIFIC INDUSTRIAL WASTES WHICH WERE ACCEPTED AT THE SITE INCLUDE OIL, PAINT, SOLVENTS AND SLUDGES, RESINS, AND FLAMMABLE, CAUSTIC, AND ARSENIC-CONTAMINATED MATERIALS. A STATE INSPECTION IN 1975 REVEALED THAT THERE WERE APPROXIMATELY 10,000 55-GALLON DRUMS AT THE SITE. ADDITIONALLY, THE STATE ESTIMATED THAT 500,000 GALLONS OF LIQUID INDUSTRIAL WASTE WERE DUMPED, AND 1,000 DRUMS WERE BURIED ONSITE AND IN CONTACT WITH GROUND WATER. AS A RESULT OF 1975 STATE ORDERS AND 1980 EPA ORDERS TO INITIATE SURFACE CLEANUP, THE SITE OPERATOR REMOVED DRUMS, TANK CARS, AND SOME CONTAMINATED SOIL FROM THE SITE'S SURFACE. THE FIRST RECORD OF DECISION (ROD), SIGNED IN SEPTEMBER 1988, ADDRESSED REMEDIATION OF AN OIL LAYER FLOATING ON THE GROUND WATER SURFACE AND WILL INCLUDE CONSTRUCTION OF A SLURRY WALL AROUND THE CONTAMINATED PORTION OF THE SITE AND EXCAVATION AND ONSITE STORAGE OF CONTAMINATED SOIL. THIS SECOND AND FINAL REMEDIAL ACTION ADDRESSES THE REMAINING THREATS TO THE SITE WHICH INCLUDE CONTAMINATED SOIL, SEDIMENT, FILL MATERIAL, GROUND WATER (GENERALLY ONSITE), AND OIL COLLECTED DURING THE FIRST OPERABLE UNIT. THE PRIMARY CONTAMINANTS OF CONCERN AFFECTING THE SOIL, SEDIMENT, FILL MATERIAL, AND GROUND WATER ARE VOCS INCLUDING BENZENE, TCE, AND TOLUENE; OTHER ORGANICS INCLUDING PAHS AND PCBS; AND METALS INCLUDING LEAD.

THE SELECTED REMEDIAL ACTION FOR THIS SITE INCLUDES EXCAVATING APPROXIMATELY 36,000 YD3 OF THE MOST SEVERELY OIL-CONTAMINATED WASTE AND FILL MATERIALS FROM THE AREA INSIDE THE SLURRY WALL, ONSITE THERMAL TREATMENT OF EXCAVATED WASTE, FILL, AND PREVIOUSLY EXTRACTED OIL, FOLLOWED BY FILLING THE EXCAVATED AREA WITH INCINERATOR AND GROUND WATER TREATMENT PROCESS RESIDUES, DISCARDED DRUMS, CONTAMINATED SEDIMENT REMOVED FROM ON- AND OFFSITE PONDS, AND TRENCH SPOILS; COVERING THE AREA CONTAINED BY THE SLURRY WELL WITH A RCRA CAP; PUMPING AND TREATMENT OF GROUND WATER INSIDE THE SLURRY WALL WITH REINJECTION OF MOST OF THE GROUND WATER WITHIN THE SLURRY WALL TO PROMOTE SOIL FLUSHING; PUMPING AND TREATMENT OF CONTAMINATED GROUND WATER OUTSIDE THE SLURRY WALL WITH REINJECTION OR DISCHARGE TO SURFACE WATER; DISMANTLING, DECONTAMINATING, AND REMOVING THE OIL STORAGE UNIT CONSTRUCTED UNDER THE FIRST OPERABLE UNIT; CONTINUED LONG-TERM GROUND WATER MONITORING; AIR MONITORING DURING REMEDIAL ACTIVITIES; AND IMPLEMENTING INSTITUTIONAL CONTROLS TO PROTECT THE SITE AND RESTRICT GROUND WATER USE. THE ESTIMATED PRESENT WORTH COST FOR THIS REMEDIAL ACTION IS $22,209,000 WHICH INCLUDES AN ANNUAL O&M COST OF $489,000.
 
Remedy:  THIS REMEDIAL ACTION IS THE SECOND AND FINAL OF TWO OPERABLE UNITS FOR THE SITE. THE FIRST OPERABLE UNIT ADDRESSED AN OIL LAYER FLOATING ON THE GROUNDWATER THROUGH OIL EXTRACTION, STORAGE, AND CONTAINMENT WITH A SOIL/BENTONITE SLURRY WALL. THE FINAL REMEDY ADDRESSES ALL REMAINING THREATS AT THE SITE, INCLUDING CONTAMINATED SOILS, FILL MATERIALS, STORED OIL, GROUNDWATER, SURFACE WATER AND SEDIMENT.

THE MAJOR COMPONENTS OF THE SELECTED REMEDY INCLUDE;

* EXCAVATION OF APPROXIMATELY 36,000 CUBIC YARDS OF OIL CONTAMINATED WASTE AND FILL DOWN TO THE NATIVE SAND,
* THERMAL TREATMENT OF EXCAVATED FILL AND EXTRACTED OIL, MOST LIKELY IN A MOBILE ON-SITE INCINERATOR,
* REMOVING DEBRIS AND CONTAMINATED SEDIMENTS FROM ON AND OFF-SITE SURFACE WATER BODIES,
* FILLING THE EXCAVATED AREA WITH TREATMENT PROCESS RESIDUALS, TRENCH SPOILS AND POND SEDIMENTS AND DEBRIS,
* COVERING THE AREA CONTAINED BY THE SLURRY WALL WITH A RCRA SUBTITLE C CAP,
* EXTRACTION, TREATMENT AND REINJECTION OF CONTAMINATED GROUNDWATER INSIDE THE SLURRY WALL TO PROMOTE SOIL FLUSHING,
* DISCHARGE OF A SMALL QUANTITY OF GROUNDWATER OUTSIDE THE SLURRY WALL TO COMPENSATE FOR INFILTRATION,
* DEED AND ACCESS RESTRICTIONS TO PROHIBIT USE OF GROUNDWATER UNDER THE SITE AND PROTECT THE CAP, AND
* LONG TERM GROUNDWATER MONITORING.
 
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