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Shattuck Superfund Site

Study Area: Denver, Colorado
Period of Project: Inactive
Project Number: CO502
Project Chief: Earl Cassidy
Cooperator: US Environmental Protection Agency

BACKGROUND:

The U.S. Geological Survey (USGS) is providing technical assistance to the Denver Radium Site Operable Unit 8, hereinafter referred to as the "Shattuck Superfund site." The Shattuck Superfund site has been remediated by on-site entombment; that is, by mixing 50,000 cubic yards of contaminated soil with fly ash and cement and placing it in the ground at a depth that is above the water table. The primary contaminants of concern are uranium, radium, and heavy metals. The current remedy has been characterized as inadequate by local residents and the City of Denver. The USGS has been asked to provide an unbiased technical review of the monitoring well network to determine if it is adequate to monitor the status of the remedy, and to characterize the contaminated ground-water plumes that are associated with the site.

OBJECTIVES:

1. To review the current ground-water monitoring program at the Shattuck site and make recommendations regarding
   1. the adequacy of the monitoring well network to define plumes associated with the site and to characterize the hydrology of the site,
   2. the current suite of constituents and contaminants of concern (especially radionuclides) being monitored in ground water, and
   3. the adequacy of current data to define local background concentrations for contaminants of concern at the site.
2. To produce a bedrock geologic map and cross sections of the alluvium and Denver formation in the vicinity of the Shattuck site.
3. To provide unbiased technical expertise to the U.S. Environmental Protection Agency regarding ground-water and radionuclide contamination at Shattuck.