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Record of Decision System (RODS)

KUMMER SANITARY LANDFILL

Abstract

Site Name:  KUMMER SANITARY LANDFILL
Address:  ANNE ST 
City & State:  BEMIDJI  MN  56601
County:  BELTRAMI
 
EPA ID:  MND980904049
EPA Region:  05
 
NPL Status:  Deleted from the Final NPL
 
ROD Type:  Record of Decision
ROD ID:  EPA/ROD/R05-88/082
ROD Date:  09/30/1988
Operable Unit(s):  02
 
Media:  GROUNDWATER SOIL
 
Contaminant:  VOCS
 
Abstract:  THE KUMMER SANITARY LANDFILL IS A 40-ACRE SITE LOCATED IN NORTHERN TOWNSHIP, BELTRAMI COUNTY, MINNESOTA. THE SITE CONSISTS OF A 35-ACRE LANDFILL AND THE KUMMER RESIDENCE LOCATED IN THE EXTREME SOUTHEAST CORNER OF THE PROPERTY. TO THE NORTH AND WEST OF THE SITE, THE LAND IS SPARSELY SETTLED WITH FARM RESIDENCES. A LARGE RESIDENTIAL COMMUNITY LIES ABOUT 1,000 FEET TO THE EAST AND WEST, AND THE CITY OF BEMIDGE IS LOCATED 0.5 MILE SOUTH OF THE SITE. THE CITY USES GROUND WATER FOR ITS DRINKING WATER; ITS WELLS ARE 0.25 MILE WEST OF THE SITE. THERE ARE NUMEROUS WETLANDS AND LAKES WITHIN THE AREA OF THE SITE. BETWEEN 1971 AND 1983 THE SITE OPERATED AS A SANITARY LANDFILL, ACCEPTING MIXED MUNICIPAL WASTE. LANDFILL OPERATIONS CONSISTED OF EXCAVATING TRENCHES, FILLING THE TRENCHES WITH WASTE MATERIALS, AND COVERING THE FILL WITH ONSITE SAND AND GRAVEL DEPOSITS. THE TRENCHES MAY HAVE BEEN EXCAVATED TO THE WATER TABLE AND THE WASTE PLACED IN DIRECT CONTACT WITH GROUND WATER. BEGINNING IN 1974, DEMOLITION DEBRIS CONSISTING OF FLY ASH AND SAWDUST WERE DISPOSED OF ONSITE. IN 1982 AND 1983 THE MINNESOTA POLLUTION CONTROL AGENCY SAMPLED GROUND WATER FROM ONSITE MONITORING WELLS AND DISCOVERED 19 VOCS INCLUDING TCE, PCE, AND BENZENE. IN 1984, VOCS WERE ALSO DISCOVERED IN OFFSITE SHALLOW RESIDENTIAL WELLS DOWNGRADIENT OF THE SITE; CONSEQUENTLY, IN 1985 THE SITE WAS ORDERED CLOSED. IN JUNE 1985 A ROD WAS SIGNED TO PROVIDE AN ALTERNATE WATER SUPPLY TO APPROXIMATELY 244 HOMES AFFECTED BY CONTAMINATED GROUND WATER. ALTHOUGH THERE IS NO DOCUMENTATION OF HAZARDOUS WASTE DISPOSAL AT THE SITE, IT IS BELIEVED THAT SMALL QUANTITIES OF WASTES SUCH AS PAINT THINNER, SOLVENTS, AND PESTICIDES WERE INCLUDED IN MUNICIPAL WASTES. THE PRIMARY CONTAMINANTS OF CONCERN AFFECTING GROUND WATER AND SOIL ARE VOCS SUCH AS TCE, PCE AND BENZENE.

THE SELECTED REMEDIAL ACTION FOR THIS SITE INCLUDES: SITE GRADING AND CONSOLIDATION OF SOIL AND OTHER WASTE MATERIAL; PLACEMENT OF A SLOPING FOUNDATION LAYER OF NATURAL SOIL FILL; CAPPING WITH A COVER SYSTEM CONSISTING OF A GAS CONTROL LAYER, A BARRIER LAYER OF LOW PERMEABILITY MATERIAL (CLAY OR FLEXIBLE SYNTHETIC MEMBRANE), AND A DRAINAGE LAYER WITH PLACEMENT OF COVER SOIL AND A VEGETATIVE LAYER; ACCESS AND DEED RESTRICTIONS LIMITING FUTURE SITE USE; AND GROUNDWATER AND LANDFILL GAS MONITORING. THE ESTIMATED CAPITAL COST OF THE SELECTED REMEDY IS $7,400,000 TO $12,500 FOR THE CLAY CAP AND $6,900,000 TO $11,200,000 FOR THE SYNTHETIC MEMBRANE, WITH ANNUAL O&M COSTS OF $35,000 AND $33,000, RESPECTIVELY.
 
Remedy:  THE SELECTED REMEDIAL ALTERNATIVE FOR THE KUMMER SANITARY LANDFILL SITE IS A SOURCE CONTROL OPERABLE UNIT TO COVER THE LANDFILL WITH A LOW PERMEABILITY CAP AND TO UNDERTAKE OTHER ACTIONS CONSISTENT WITH STATE SANITARY LANDFILL CLOSURE REQUIREMENTS.
THE MAJOR COMPONENTS OF THE SELECTED REMEDIAL ALTERNATIVE ARE;
* SITE GRADING AND CONSOLIDATION OF WASTE MATERIAL.
* PLACEMENT OF A SLOPING FOUNDATION LAYER OF 1-15 FEET OF EXISTING AND PROPOSED NATURAL SOIL FILL.
* CAPPING WITH A COVER SYSTEM CONSISTING OF A 0.5 FEET GAS CONTROL LAYER, A 2.0 FOOT BARRIER LAYER OF LOW PERMEABLE MATERIAL (CLAY) OR A 0.30 MILLIMETER FLEXIBLE MEMBRANE, AND A 1.0 FOOT DRAINAGE LAYER.
* A 1.5 FOOT TOPSOIL, COVER SOIL, AND VEGETATION LAYER TO PROVIDE PROTECTION OF THE DRAINAGE AND BARRIER LAYERS.
* SITE DEED RESTRICTIONS LIMITING FUTURE USE OF SITE. * FENCING TO RESTRICT ACCESS TO THE SITE.
* LONG-TERM OPERATION AND MAINTENANCE TO PROVIDE INSPECTIONS AND REPAIRS TO THE LANDFILL CAP. THE FOLLOWING COMPONENT WILL BE EVALUATED DURING THE REMEDIAL DESIGN;
* DETERMINATION WHETHER A LOW PERMEABILITY MATERIAL (CLAY) OR A FLEXIBLE, SYNTHETIC MEMBRANE LINER IS BEST SUITED FOR USE AS THE BARRIER LAYER. THIS ACTION WILL REQUIRE OPERATION AND MAINTENANCE ACTIVITIES TO ENSURE CONTINUED EFFECTIVENESS OF THE REMEDIAL MEASURES. THE ACTION BEING TAKEN IS CONSISTENT WITH SECTION 121 OF CERCLA AS AMENDED BY SARA, 42, U.S.C. #9621. THE STATE OF MINNESOTA HAS BEEN CONSULTED AND CONCURS WITH THE SELECTED REMEDY.
 
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