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Record of Decision System (RODS)

DAKHUE SANITARY LANDFILL

Abstract

Site Name:  DAKHUE SANITARY LANDFILL
Address:  260TH & HOGAN AVE 
City & State:  CANNON FALLS  MN  55031
County:  DAKOTA
 
EPA ID:  MND981191570
EPA Region:  05
 
NPL Status:  Deleted from the Final NPL
 
ROD Type:  Record of Decision
ROD ID:  EPA/ROD/R05-91/189
ROD Date:  06/28/1991
Operable Unit(s):  01
 
Media:  SOIL DEBRIS
 
Contaminant:  ORGANICS, PHENOLS, METALS, ARSENIC, CHROMIUM, LEAD
 
Abstract:  THE 80-ACRE DAKHUE SANITARY LANDFILL SITE IS AN INACTIVE SANITARY WASTE MUNICIPAL LANDFILL LOCATED IN HAMPTON TOWNSHIP, DAKOTA COUNTY, MINNESOTA. LAND USE IN THE AREA IS AGRICULTURAL AND RESIDENTIAL. THE LANDFILL OVERLIES A SAND AND GRAVEL SURFICIAL AQUIFER THAT IS NOT A DRINKING WATER SOURCE AND THAT EXTENDS DOWNGRADIENT OF THE SITE. HOWEVER, 15 RESIDENTIAL WELLS ARE LOCATED WITHIN 1 MILE OF THE SITE, AND A MUNICIPAL WATER SUPPLY WELL IS LOCATED OVER 3 MILES SOUTH OF THE SITE, ALL OF WHICH EXTRACT GROUND WATER FROM A DEEPER AQUIFER. INVESTIGATIONS ARE ONGOING TO DETERMINE WHETHER THE TWO AQUIFERS ARE HYDRAULICALLY CONNECTED. FROM 1971 TO 1988, DAKHUE SANITARY LANDFILL, INC., OWNED AND OPERATED THE LANDFILL AND ACCEPTED MIXED MUNICIPAL AND COMMERCIAL WASTES, AND SMALL AMOUNTS OF INDUSTRIAL WASTE. STATE INVESTIGATIONS CONDUCTED BETWEEN 1983 AND 1989 IDENTIFIED A VARIETY OF CONTAMINANTS ONSITE. INVESTIGATIONS DURING THE RI/FS IDENTIFIED VOCS, ORGANICS, AND INORGANICS IN THE SURFICIAL ONSITE AQUIFER, AND IT HAS BEEN DETERMINED THAT THE POSSIBLE SOURCE OF CONTAMINATION IS RELATED TO THE MUNICIPAL, INDUSTRIAL, AND COMMERCIAL WASTE DISPOSED ONSITE IN THE LANDFILL. ONGOING INVESTIGATIONS ARE REQUIRED TO FURTHER DEFINE ONSITE GROUND WATER CONTAMINATION. AS A RESULT, THE SITE WILL BE REMEDIATED AS TWO OPERABLE UNITS (OUS). THIS ROD ADDRESSES THE SOURCE OF THE CONTAMINATION AS OU1. A FUTURE ROD WILL ADDRESS GROUND WATER CONTAMINATION AND POSSIBLE REMEDIATION OF THE DOWNGRADIENT PLUME, AS OU2. THE PRIMARY CONTAMINANTS OF CONCERN AFFECTING THE SOIL AND DEBRIS ARE ORGANICS INCLUDING PHENOLS; AND METALS INCLUDING ARSENIC, CHROMIUM, AND LEAD.

THE SELECTED REMEDIAL ACTION FOR THIS SITE INCLUDES CAPPING THE SITE WITH A FINAL COVER SYSTEM CONSISTING OF A GAS CONTROL LAYER, A BARRIER OF LOW-PERMEABILITY MATERIAL, AND A DRAINAGE LAYER; REVEGETATING THE AREA; TREATING AIR EMISSIONS FROM GAS VENTS; CONDUCTING AIR AND GROUND WATER MONITORING; AND INSTALLING A FENCE AROUND THE SITE PERIMETER. THE CAPITAL COST FOR THIS REMEDIAL ACTION IS $9,800,000, WHICH INCLUDES AN ESTIMATED ANNUAL O&M COST OF $54,000 FOR 2 YEARS.

PERFORMANCE STANDARDS OR GOALS; NOT APPLICABLE.
 
Remedy:  THIS OPERABLE UNIT IS THE FIRST OF TWO OPERABLE UNITS FOR THE SITE. THE FIRST OPERABLE UNIT ADDRESSES THE SOURCE OF THE CONTAMINATION BY CONTAINING THE ON-SITE WASTES AND CONTAMINATED SOIL. THE FUNCTION OF THIS OPERABLE UNIT IS TO PROVIDE A FINAL COVER FOR THE DAKHUE SANITARY LANDFILL WHICH WILL PREVENT OR MINIMIZE GROUND WATER CONTAMINATION AND RISKS ASSOCIATED WITH EXPOSURE TO THE CONTAMINATED MATERIALS. THE REMEDY DOES NOT FULLY ADDRESS THE PRINCIPAL THREATS AT THE SITE BECAUSE IT IS NOT APPROPRIATE TO ADDRESS THE GROUND WATER CONTAMINATION AT THIS TIME. THE SECOND OPERABLE UNIT WILL ADDRESS THE GROUND WATER CONTAMINATION AND POSSIBLE REMEDIATION OF THE DOWNGRADIENT PLUME.

THE MAJOR COMPONENTS OF THE SELECTED REMEDY INCLUDE;
* INSTALLING A SECURITY FENCE AROUND THE LANDFILL SITE,
* CAPPING WITH A FINAL COVER SYSTEM CONSISTING OF A GAS CONTROL LAYER, A BARRIER LAYER OF LOW PERMEABLE MATERIAL, AND A DRAINAGE LAYER,
* TOPSOIL COVER AND VEGETATION,
* TREATMENT OPTIONS FOR AIR EMISSIONS FROM GAS VENTS WILL BE CONSIDERED AFTER CONSTRUCTION OF THE FINAL COVER,
* AIR AND GROUND WATER MONITORING TO ENSURE THE EFFECTIVENESS OF THE REMEDIAL ACTION WILL BE IMPLEMENTED AFTER CONSTRUCTION OF THE FINAL COVER.

THIS ACTION WILL REQUIRE OPERATION AND MAINTENANCE ACTIVITIES TO ENSURE CONTINUED EFFECTIVENESS OF THE REMEDIAL ALTERNATIVE. THE ACTION BEING TAKEN IS CONSISTENT WITH SECTION 121 OF CERCLA, AS AMENDED BY SARA, 42 USC S 9621.
 
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