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Record of Decision System (RODS)

OAK GROVE SANITARY LANDFILL

Abstract

Site Name:  OAK GROVE SANITARY LANDFILL
Address:  2536 VIKING BLVD NORTHWEST 
City & State:  OAK GROVE TOWNSHIP  MN  55011
County:  ANOKA
 
EPA ID:  MND980904056
EPA Region:  05
 
NPL Status:  Deleted from the Final NPL
 
ROD Type:  Record of Decision
ROD ID:  EPA/ROD/R05-91/153
ROD Date:  12/21/1990
Operable Unit(s):  02
 
Media:  GROUNDWATER
 
Contaminant:  VOCS, BENZENE, TOLUENE, XYLENES, METALS, ARSENIC
 
Abstract:  THE 45-ACRE OAK GROVE SANITARY LANDFILL IS A FORMER MUNICIPAL AND INDUSTRIAL SOLID WASTE LANDFILL IN OAK GROVE TOWNSHIP, ANOKA COUNTY, MINNESOTA. LAND CONSISTS OF LOW REGIONS OF UPLANDS AND SAND DUNES INTERSPERSED AMONG NUMEROUS LAKES AND WETLANDS. THE NEARBY DEVELOPED LAND USE IN THE AREA IS AGRICULTURAL AND RESIDENTIAL. THE SITE OVERLIES TWO AQUIFERS, WHICH ARE SEPARATED BY A SEMI-CONFINING LAYER. THE DEEPER AQUIFER PROVIDES REGIONAL POTABLE WATER AND SUPPLIES MANY AREA RESIDENTIAL WELLS. LANDFILL OPERATIONS BEGAN IN 1967 AND CONTINUED UNTIL 1984, WHEN THE OPERATING LICENSE WAS SUSPENDED. AN ESTIMATED 2.5 MILLION CUBIC YARDS OF WASTE IS PRESENT IN THE LANDFILL INCLUDING ACIDIC OIL SLUDGE, PAINT AND SOLVENT WASTE, FOUNDRY SANDS AND SLUDGE, INORGANIC ACIDS, METAL SLUDGE, AND CHLORINATED AND UNCHLORINATED ORGANIC COMPOUNDS FROM PESTICIDE MANUFACTURING. IN ADDITION, LIME SLUDGE WAS USED AS A COVER MATERIAL ON TWO THIRDS OF THE LANDFILL. A 1988 RECORD OF DECISION (ROD) ADDRESSED THE SOURCES OF CONTAMINATION BY CONTAINING THE ONSITE WASTE AND CONTAMINATED SOIL WITH A COVER. EPA INVESTIGATIONS IN 1989 DETERMINED THAT THE CONTAMINATED SHALLOW AQUIFER DISCHARGES DIRECTLY TO THE SURFACE WATER OF THE ADJOINING WETLANDS WHERE GROUND WATER CONTAMINATION IS BEING REDUCED BY NATURAL ATTENUATION, AND THUS, LIMITING MIGRATION OF CONTAMINANTS TO THE SURFACE WATER. THIS ROD ADDRESSES REMEDIATION OF CONTAMINATED SHALLOW GROUND WATER, PREVENTION OF SIGNIFICANT IMPACTS ON SURFACE WATER FROM THE DISCHARGE OF CONTAMINATED SHALLOW GROUND WATER, AND PROVIDES FOR CONTINUED USE OF THE DEEP AQUIFER AS A DRINKING WATER SUPPLY. THE PRIMARY CONTAMINANTS OF CONCERN AFFECTING THE GROUND WATER ARE VOCS INCLUDING BENZENE, TOLUENE, AND XYLENES; AND METALS INCLUDING ARSENIC.

THE SELECTED REMEDIAL ACTION FOR THIS SITE INCLUDES LONG TERM MONITORING OF THE SHALLOW AND DEEP AQUIFERS, SURFACE WATER, AND SEDIMENT AT A FREQUENCY OF THREE TIMES PER YEAR FOR THE FIRST YEAR AND SEMI-ANNUALLY THEREAFTER; NATURAL ATTENUATION OF SHALLOW GROUND WATER; ABANDONING NON-ESSENTIAL WELLS; AND IMPLEMENTING INSTITUTIONAL CONTROLS INCLUDING GROUND WATER USE RESTRICTIONS. THE ESTIMATED PRESENT WORTH COST FOR THIS REMEDIAL ACTION IS $800,000, WHICH INCLUDES AN ANNUAL O&M COST OF $90,000 FOR THE FIRST YEAR AND $70,000 FOR SUBSEQUENT YEARS.

PERFORMANCE STANDARDS; SEDIMENT, GROUND WATER, AND SURFACE WATER MONITORING WILL ASSURE THAT CONTAMINANT LEVELS DO NOT EXCEED SDWA MCLS, CWA AWQCS, AND STATE SURFACE WATER QUALITY STANDARDS.
 
Remedy:  THIS OPERABLE UNIT IS THE SECOND OF TWO OPERABLE UNITS FOR THE SITE. THE FIRST OPERABLE UNIT ADDRESSES THE SOURCE OF CONTAMINATION BY CONTAINING THE ON-SITE WASTES AND CONTAMINATED SOIL WITH A COVER. THIS PARTICULAR COVER SYSTEM WAS DOCUMENTED IN A SEPTEMBER 1988, ROD. THE OPERABLE UNIT DESCRIBED IN THIS DECISION DOCUMENT ADDRESSES GROUNDWATER CONTAMINATION. THE REMEDY SELECTED FOR GROUNDWATER CONTAMINATION INCLUDES CONTINUED MONITORING OF BOTH AQUIFERS PRESENT AT THE SITE AS WELL AS MONITORING OF SURFACE WATER AND SEDIMENTS. THE SELECTED REMEDY ALSO INCORPORATES INSTITUTIONAL CONTROLS ON THE PLACEMENT OF DRINKING WATER WELLS AND NATURAL ATTENUATION OF SHALLOW CONTAMINATED GROUND WATER. THIS REMEDY WHEN USED IN CONJUNCTION WITH THE FINAL COVER SYSTEM, ADDRESSES THE THREAT POSED THE CONTAMINATED GROUND WATER BY ELIMINATING OR REDUCING THE RISKS POSED BY THE SITE, THROUGH ENGINEERING CONTROLS.

THE MAJOR COMPONENTS OF THE SELECTED REMEDY INCLUDE;
* LONG TERM MONITORING OF THE SHALLOW AND DEEP AQUIFERS FOR VOLATILE ORGANIC COMPOUNDS, ARSENIC, BARIUM, NICKEL, ZINC, PESTICIDES, PCBS AND NUTRIENT PARAMETERS. A MINIMUM OF TWELVE WELLS WILL BE MONITORED.
* LONG TERM MONITORING OF SURFACE WATERS FOR THE SAME CONSTITUENTS WHICH ARE MONITORED FOR THE GROUND WATER. SURFACE WATER MONITORING POINTS WILL BE ESTABLISHED BASED ON A CONDUCTIVITY SURVEY.
* LONG TERM MONITORING OF SEDIMENTS FOR ARSENIC, BARIUM AND NICKEL. SEDIMENT SAMPLE POINTS WILL BE LOCATED WHERE SURFACE WATER SAMPLING OCCURS.
* SEDIMENTS, GROUND AND SURFACE WATERS WILL BE SAMPLED AT A FREQUENCY OF THREE TIMES PER YEAR FOR THE FIRST YEAR AND SEMI-ANNUALLY THEREAFTER.
* INSTITUTIONAL CONTROLS WILL BE IMPLEMENTED AND NON-ESSENTIAL WELLS WOULD BE ABANDONED.
* NATURAL ATTENUATION OF SHALLOW GROUND WATER.
 
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