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Record of Decision System (RODS)

PINE BEND SANITARY LANDFILL

Abstract

Site Name:  PINE BEND SANITARY LANDFILL
Address:  2495 E 117TH ST 
City & State:  DAKOTA COUNTY  MN  55075
County:  DAKOTA
 
EPA ID:  MND000245795
EPA Region:  05
 
NPL Status:  Deleted from the Final NPL
 
ROD Type:  Record of Decision
ROD ID:  EPA/ROD/R05-91/178
ROD Date:  09/30/1991
Operable Unit(s):  01
 
Media:  GROUNDWATER
 
Contaminant:  VOCS, BENZENE, PCE, TCE, TOLUENE
 
Abstract:  THE PINE BEND SANITARY LANDFILL SITE IS LOCATED 1 MILE EAST OF THE MISSISSIPPI RIVER IN INVER GROVE HEIGHTS, DAKOTA COUNTY, MINNESOTA. LAND USE IN THE AREA IS RESIDENTIAL AND INDUSTRIAL. THE TERRAIN IS GENERALLY FLAT AND CONTAINS AN IMMATURE DRAINAGE SYSTEM RESULTING IN ONSITE NUMEROUS PONDS AND WETLANDS. THE SITE IS COMPOSED OF TWO LANDFILLS: THE 255-ACRE ACTIVE PINE BEND SANITARY LANDFILL (PBSL) AND THE INACTIVE 52-ACRE CROSBY AMERICAN DEMOLITION LANDFILL (CADL). PBSL BEGAN OPERATION IN 1971 AS A MIXED MUNICIPAL SOLID WASTE FACILITY. CADL ACCEPTED COMPRESSED BALES OF MUNICIPAL SOLID WASTES FROM 1971 TO 1974, AND LATER, FROM 1976 TO 1989 ALSO ACCEPTED DEMOLITION WASTES. HYDROGEOLOGIC DATA FROM THE SITE SHOW THAT THE TWO LANDFILLS ARE CONSIDERED ONE SITE BECAUSE THEIR GROUND WATER PLUMES COMMINGLE WITHIN A COMMON SURFICIAL AQUIFER. THE RESULTING PLUME MOVES THROUGH THE SURFICIAL AQUIFER AND IS BELIEVED TO EVENTUALLY DISCHARGE TO THE MISSISSIPPI RIVER VIA SPRINGS IN THE RIVER BOTTOM. IN 1983, ELEVATED LEVELS OF VOCS WERE DETECTED IN THE SURFICIAL GROUND WATER BENEATH THE SITE, AND LOW LEVELS OF VOCS WERE IDENTIFIED IN NUMEROUS DOWNGRADIENT COMMERCIAL AND RESIDENTIAL WELLS. THIS CONTAMINATION IS BELIEVED TO BE THE RESULT OF PRECIPITATION INFILTRATING THROUGH THE PERMEABLE LANDFILL MATERIAL AND COMING IN CONTACT WITH BURIED WASTE. SINCE 1986, AT THE REQUEST OF THE STATE, CADL HAS PROVIDED BOTTLED WATER TO RESIDENCES WITH CONTAMINATED WELLS TO MINIMIZE THE RISK OF VOC-CONTAMINATION MIGRATING FROM THE PBSL/CADL SITE. THIS RECORD OF DECISION (ROD) ADDRESSES GROUND WATER CONTAMINATION AS THE FIRST OF THREE OPERABLE UNITS (OUS). FUTURE RODS WILL ADDRESS SOURCE CONTROL AND FINAL REMEDIATION OF GROUND WATER. THE PRIMARY CONTAMINANTS OF CONCERN AFFECTING THE SITE ARE VOCS INCLUDING BENZENE, PCE, TCE, AND TOLUENE.

THE SELECTED REMEDIAL ACTION FOR THIS SITE INCLUDES PROVIDING A PERMANENT ALTERNATIVE WATER SUPPLY BY EXTENDING THE EXISTING INVER GROVE HEIGHTS MUNICIPAL WATER SUPPLY; CONNECTING IMPACTED OR POTENTIALLY IMPACTED PREMISES TO THE MUNICIPAL WATER SUPPLY; AND PERMANENTLY SEALING THE POTENTIALLY AFFECTED ONSITE PRIVATE WATER SUPPLY WELLS. THE ESTIMATED PRESENT WORTH COST FOR THIS REMEDIAL ACTION IS $2,649,499, WHICH INCLUDES AN ANNUAL O&M COST OF $30,350 FOR 30 YEARS. PERFORMANCE STANDARDS OR GOALS; NOT APPLICABLE.
 
Remedy:  THIS OPERABLE UNIT IS THE FIRST OF THREE OPERABLE UNITS FOR THE SITE. IT INVOLVES THE INSTALLATION OF A PERMANENT ALTERNATE WATER SUPPLY. THE SECOND OPERABLE UNIT INVOLVES SOURCE CONTROL FOR THE SITE. THE THIRD OPERABLE UNIT WILL ADDRESS THE CONTAMINATION THAT IS PRESENT IN THE GROUND WATER. THE COMBINATION OF THESE THREE DISCRETE ACTIONS ARE EXPECTED TO ADDRESS THE RELEASES AND THREATENED RELEASES AT THE SITE. THIS RECORD OF DECISION WILL IDENTIFY THE SELECTED REMEDY FOR THE FIRST OPERABLE UNIT ONLY. THE SECOND AND THIRD OPERABLE UNITS WILL EACH BE ADDRESSED IN THEIR RESPECTIVE RECORD OF DECISIONS AT A LATER DATE.

THE SELECTED REMEDY FOR THE FIRST OPERABLE UNIT CONSISTS OF THE FOLLOWING COMPONENTS;
* THE EXTENSION OF THE EXISTING CITY OF INVER GROVE HEIGHTS MUNICIPAL WATER SUPPLY;
* THE CONNECTION OF IMPACTED OR POTENTIALLY IMPACTED PREMISES TO THE MUNICIPAL WATER SUPPLY;
* THE PERMANENT SEALING OF THE PRIVATE WATER SUPPLY WELLS WHICH PRESENTLY SERVE THE PREMISES THAT WILL BE CONNECTED TO THE MUNICIPAL WATER SUPPLY.
 
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