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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/R05-88/071
ROD Date:  09/20/1988
Operable Unit(s):  01
 
Media:  GROUNDWATER
 
Contaminant:  METALS, ORGANICS, PCBS, PAHS, VOCS, BENZENE, TOLUENE, XYLENES
 
Abstract:  THE NINTH AVENUE DUMP (NAD) IS A 17-ACRE INACTIVE CHEMICAL AND INDUSTRIAL WASTE DISPOSAL SITE LOCATED IN GARY, INDIANA. NAD IS LOCATED IN A LOW-LYING AREA WITH POOR DRAINAGE. PRIOR TO FILLING, THE SITE CONSISTED OF PARALLEL RIDGES SEPARATED BY WETLANDS AREAS. HAZARDOUS WASTE DISPOSAL ACTIVITIES OCCURRED AT THE SITE FROM EARLY TO MID 1970S WITH SOME FILLING CONTINUING UNTIL 1980. THE SITE ACCEPTED DRY INDUSTRIAL, CONSTRUCTION AND DEMOLITION WASTE, OIL, SOLVENTS, PAINT SOLVENTS AND SLUDGES, RESINS, ACIDS, AND FLAMMABLE, CAUSTIC AND ARSENIC-CONTAMINATED MATERIALS. A SMALL-SCALE AUTO WRECKING OPERATION HAS REPORTEDLY BEEN OBSERVED AT THE PROPERTY IN 1975 BY THE INDIANA STATE BOARD OF HEALTH (ISBH) WHICH DOCUMENTED THE PRESENCE OF 10,000 55-GALLON DRUMS AT THE SITE, MANY OF WHICH WERE EMPTY. ADDITIONALLY, THE INSPECTION ESTIMATED APPROXIMATELY 500,000 GALLONS OF LIQUID INDUSTRIAL WASTE AND 1,000 BURIED DRUMS PRESENT AT THE SITE. SUBSEQUENT INSPECTION REVEALED PORTIONS OF DISCARDED AUTO BATTERIES, DRUMMED LIQUID WASTES, AND ABANDONED TANKER TRUCKS. IN 1975 AND 1980 EPA ORDERED THE SITE OPERATOR TO INITIATE SURFACE CLEANUPS. SUBSEQUENTLY, HE REMOVED SOME BARRELS, JUNK CARS, AND TRUCKS. THIS FIRST OPERABLE UNIT ADDRESSES REMEDIATION OF AN OIL LAYER FLOATING ON THE GROUND WATER SURFACE, THE PRINCIPAL ENVIRONMENTAL THREAT AT THE SITE. THE QUANTITY OF OIL UNDER THE SITE IS ESTIMATED AT 250,000 TO 700,000 GALLONS, OF WHICH 100,000 TO 500,000 GALLONS ARE ESTIMATED TO BE RECOVERABLE. SEVERAL ORGANIC AND INORGANIC CONTAMINANTS HAVE BEEN DETECTED IN THE OIL IN HIGHER CONCENTRATIONS THAN IN OTHER MEDIA. OIL SEEPS HAVE BEEN OBSERVED IN ONSITE PONDS LEADING TO CONCERNS THAT THE OIL MAY BE AFFECTING AQUATIC LIFE, AND AN OIL SHEEN HAS BEEN SEEN ON SEVERAL SURFACE WATER BODIES. THE SECOND OPERABLE UNIT WILL ADDRESS BURIED WASTE, CONTAMINATED SOIL, AND CONTAMINATED GROUND WATER. THE PRIMARY CONTAMINANTS IN THE OIL LAYER INCLUDE: VOCS, BENZENE, TOLUENE, XYLENE, PAHS, ORGANICS, PCBS, METALS, AND CYANIDES.

THE SELECTED REMEDIAL ACTION FOR THIS SITE INCLUDES; CONSTRUCTION OF A SOIL-BENTONITE SLURRY WALL TO COMPLETELY SURROUND THE HYDROCARBON LAYER; SEPARATE EXTRACTION OF OIL AND GROUND WATER THROUGH A SERIES OF CENTRAL EXTRACTION WELLS, FOLLOWED BY STORAGE OF THE RECOVERED OIL IN AN ONSITE STORAGE TANK AND RECHARGE OF THE TREATED GROUND WATER THROUGH RECHARGE WELLS; AND GROUND WATER MONITORING. OIL TREATMENT WILL BE EVALUATED IN THE SECOND OPERABLE UNIT. THE ESTIMATED CAPITAL COST FOR THIS REMEDIAL ACTION IS $1,960,000 WITH ANNUAL O&M OF $190,000.
 
Remedy:  THIS INTERIM REMEDIAL ACTION IS THE FIRST OF TWO OPERABLE UNITS FOR THE SITE. THIS OPERABLE UNIT ADDRESSES THE PRINCIPAL ENVIRONMENTAL THREAT AT THE SITE, AN OIL LAYER FLOATING ON THE GROUNDWATER AND SEEPING INTO WETLANDS AREAS. THE FUNCTION OF THIS OPERABLE UNIT IS TO EXTRACT AND STORE FREE-FLOWING OIL AND CONTAIN REMAINING OIL WITH A SLURRY WALL. THE SECOND OPERABLE UNIT WILL ADDRESS TREATMENT OF THE EXTRACTED OIL, AS WELL AS REMEDIATION OF WASTE, SOIL AND GROUNDWATER CONTAMINATION.
THE MAJOR COMPONENTS OF THE SELECTED REMEDY INCLUDE:
* CONSTRUCTING A SOIL - BENTONITE SLURRY WALL TO COMPLETELY SURROUND THE OIL LAYER;
* INSTALLING AN OIL/GROUNDWATER EXTRACTION AND GROUNDWATER RECHARGE SYSTEM;
* INSTALLING A SMALL SCALE ON-SITE GROUNDWATER TREATMENT SYSTEM TO ALLOW FOR DEWATERING OF THE SLURRY WALL;
* MONITORING GROUNDWATER INSIDE AND OUTSIDE THE SLURRY WALL TO ENSURE ITS EFFECTIVENESS; AND
* INSTALLING AN ON-SITE OIL STORAGE TANK.
 
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