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Record of Decision System (RODS)



City & State:  HERMANTOWN  MN  55810
County:  ST. LOUIS
EPA ID:  MND980823975
EPA Region:  05
NPL Status:  Currently on the Final NPL
ROD Type:  Amendment
ROD ID:  EPA/AMD/R05-94/261
ROD Date:  02/09/1994
Operable Unit(s):  01
Media:  soil, sediment
Contaminant:  Lead
Abstract:  Please note that the text in this document summarizes the Record of Decision for the purposes of facilitating searching and retrieving key text on the ROD. It is not the officially approved abstract drafted by the EPA Regional offices. Once EPA Headquarters receives the official abstract, this text will be replaced.
This decision document amends the selected remedial action for the Arrowhead Refinery. This amendment to the Record of Decision makes fundamental changes to the remedy selected in the 1986 Record of Decision (ROD).

Actual or threatened releases of hazardous substances from the Site, if not addressed by implementing the response action selected in this AROD, may present an imminent and substantial endangerment to the public health, welfare, and/or the environment.

The U.S. Environmental Protection Agency conducted a solvent extraction study which indicated that the technology presented in the 1986 ROD would not be a suitable technology for the Arrrowhead Site. A group of Potentially Responsible Parties (PRPs) conducted treatability studies in an effort to find a less costly alternative to incineration for both source material, soils and sediments.

Also during these investigations, it was discovered that as soil samples were obtained and analyzed, PAH and VOC levels were consistently found to be below health based levels of concern. This was verified in a separate field sampling study conducted in June 1993. Upon review of the early field studies, it was found that there were only two PAH "hot spots" in the soil and that these were likely due to cross contamination with filter cake. As a consequence of these findings, the soil and sediment contaminant of concern is now only lead. Therefore, treatment technologies which targeted organic compounds in soils and sediments, including incineration, have been discounted from further consideration.
Remedy:  The major element of the selected amended remedy include: excavation of sludge and filter cake using a visually contaminated standard; on-site treatment of sludge and filter cake by chemical disassociation of the toxic compounds within the sludge/filter cake matrix to produce a saleable off-specification fuel and to recover lead in a smelting operation or to stabilize and place in an permitted RCRA facility; excavation of visually contaminated soils and sediments, followed by placement of soils and sediments in a permitted RCRA facility; operation and maintenance of the groundwater extraction and treatment system until groundwater at the site perimeter meets Maximum Contamination Limits.
Text:  View full-text ROD [ 12K ]
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