Superfund Record of Decision Amendment (EPA Region 5): Ninth Avenue Dump, Gary,IN., September 13, 1994

摘要

The decision document, together with Records of Decision dated June 30, 1989(PB90-114810) and September 20, 1988 (PB89-153837) and an Explanation of Significant Differences dated October 1991, present the selected remedial action for the Ninth Avenue Dump site. The remedial action for the site consists of two operable units. The first operable unit addressed an oil layer floating on the groundwater by means of oil and groundwater extraction, oil storage, reintroduction of the groundwater, containment with a slurry wall, and management of excess surface water. The extracted groundwater was treated prior to reintroduction. The second operable unit, which is being amended by this decision document, addresses the remaining threats at the site.