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Record of Decision System (RODS)

ARROWHEAD REFINERY CO.

Abstract

Site Name:  ARROWHEAD REFINERY CO.
Address:  NW CORNER HWY 53 & UGSTAD ROAD 
City & State:  HERMANTOWN  MN  55810
County:  ST. LOUIS
 
EPA ID:  MND980823975
EPA Region:  05
 
NPL Status:  Currently on the Final NPL
 
ROD Type:  Record of Decision
ROD ID:  EPA/ROD/R05-86/044
ROD Date:  09/30/1986
Operable Unit(s):  01
 
Media:  GROUNDWATER SEDIMENTS SOIL SURFACE WATER
 
Contaminant:  LEAD, PAHS, VOCS
 
Abstract:  THE ARROWHEAD REFINERY SITE IS LOCATED IN HERMANTOWN, ST. LOUIS COUNTY, MINNESOTA. THE SITE CONSISTS OF 10 ACRES OF RELATIVELY FLAT LAND WITH PEATY WETLANDS SCATTERED ACROSS THE AREA, AND IT IS ZONED FOR COMMERCIAL USE. LAND USE IN THE VICINITY IS A COMBINATION OF RESIDENTIAL, COMMERCIAL, AND PUBLIC. BETWEEN 1945 AND 1977, THE SITE WAS USED AS A WASTE OIL RECLAIMING FACILITY. THE OPERATION GENERATED WASTE BY-PRODUCTS WHICH WERE DISCHARGED INTO AN UNCONTAINED 2-ACRE LAGOON AND A WASTE WATER DITCH IN A WETLAND AREA. ARROWHEAD REFINERY COMPANY, INCORPORATED IN 1961, CONTINUED REFINING AND RECYCLING OPERATIONS UNTIL 1977, WHEN THE MINNESOTA POLLUTION CONTROL AGENCY ORDERED WORK TO BE STOPPED. INVESTIGATIONS CONDUCTED BY EPA IN 1979 REVEALED THAT ONSITE SURFACE WATER WAS TRANSPORTING CONTAMINANTS TO NEARBY WETLANDS AREAS AND NAVIGABLE WATERS. IN RESPONSE, A SURFACE WATER DIVERSION DITCH WAS CONSTRUCTED TO PREVENT FURTHER CONTAMINANT MIGRATION. THE PRIMARY CONTAMINANTS OF CONCERN ARE VOCS, PAHS AND LEAD, AND THEY ARE FOUND IN ONSITE SOILS, SEDIMENTS, SURFACE WATERS AND GROUND WATER.

THE SELECTED REMEDIAL ACTION FOR THE ARROWHEAD REFINERY SITE INCLUDES; EXCAVATION AND ONSITE INCINERATION OF 4,600 CY OF SLUDGE AND 20,500 CY OF CONTAMINATED SOILS AND SEDIMENTS; GROUND WATER PUMPING AND TREATING DESIGNED TO RESTORE THE AQUIFER AND CONTROL CONTAMINANT MIGRATION OVER A 25-50 YEAR PERIOD; EXTENSION OF A NEARBY MUNICIPAL WATER SUPPLY SYSTEM TO REPLACE THOSE PRIVATE WATER SUPPLIES MOST LIKELY TO BE AFFECTED BY GROUND WATER CONTAMINATION; AND PROPER ABANDONMENT OF INDIVIDUAL WELLS FORMERLY USED AS DRINKING WATER SUPPLIES IN ACCORDANCE WITH STATE WELL CODES. ESTIMATED CAPITAL COST OF THE REMEDY IS $22,000,000 WITH ANNUAL O&M COSTS RANGING BETWEEN $130,000 AND $180,000.
 
Remedy:  - EXCAVATION AND ONSITE INCINERATION OF 4,600 CUBIC YARDS OF SLUDGE AND 20,500 CUBIC YARDS OF CONTAMINATED SOILS AND SEDIMENTS.
- A GROUNDWATER PUMP AND TREAT SYSTEM TO BE DESIGNED TO RESTORE THE AQUIFER AND CONTROL CONTAMINANT MIGRATION OVER A 25-50 YEAR PERIOD.
- EXTENSION OF NEARBY MUNICIPAL WATER SYSTEM TO REPLACE THOSE PRIVATE WATER SUPPLIES MOST LIKELY TO BE AFFECTED BY GROUNDWATER CONTAMINATION FROM THE ARROWHEAD SITE.
- PROPER ABANDONMENT IN ACCORDANCE WITH STATE WELL CODES OF INDIVIDUAL WELLS FORMERLY USED AS DRINKING WATER SUPPLIES.
- THE SELECTED ALTERNATIVE HAS TOTAL CAPITAL COST OF $22 MILLION AND ANNUAL OPERATION AND MAINTENANCE COST RANGING FROM $130,000 TO $180,000. THE 30 YEAR PRESENT WORTH IS $23-24 MILLION.
 
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