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Sue Kahle,
934 Broadway,
Suite 300
Tacoma, WA 98402
(sckahle@usgs.gov)
(253) 552-1616

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Uranium in Groundwater

Project Summaries

  
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Uranium in Groundwater in northeastern Washington

Problem - Recent groundwater monitoring in northeastern Washington has shown elevated levels of uranium in several community water systems and in private wells. Naturally occurring uranium is associated with granitic and metasedimentary rocks, as well as younger sedimentary deposits, that occur in northeastern Washington. The occurrence and distribution of uranium in groundwater, however, is poorly understood and warrants investigation in order to reduce uranium exposure, protect from toxic kidney effects of uranium, and reduce the risk of cancer.

Objectives - The overall objective of the proposed project is to conduct a reconnaissance style study involving: (1) compiling existing geologic, hydrogeologic, and radionuclide information for northeastern Washington State, (2) converting available data sets to GIS format, (3) preparing maps of available data sets in order to identify areas of known MCL exceedances of uranium in groundwater and to evaluate data gaps, (4) obtaining reconnaissance uranium-concentration data for selected wells (~20 wells) in areas without data, and (5) preparing and publishing a USGS Scientific Investigations Map summarizing available data, data gaps, and suggestions for further study in order to understand the occurrence and distribution of uranium and in groundwater in northeastern Washington State.

Relevance and Benefits - This study contributes to the goals of the USGS strategic science direction, identifying environmental risk to public health in America, as identified and described in the Strategic Science Plan of the USGS (U.S. Geological Survey, 2007). The study addresses groundwater quality which is a priority issue for both the USGS Water Mission Area and the USGS Washington Water Science Center. The project also serves the USGS mission by advancing the science of water- resource assessments of the region, by providing data useful to multiple parties, and by furnishing information that will help protect human health.

Approach - Documents and data sets from local, regional, state, and national agencies will be obtained and reviewed, and selected data sets will be converted to digital coverages for data analysis purposes. Limited new reconnaissance data will be collected for private wells in areas where uranium-concentration data are generally lacking; water samples from those wells will be analyzed at the USGS National Water Quality Laboratory. A USGS Scientific Investigations Map and associated Data Release will be published to report on the current knowledge and data gaps regarding uranium in groundwater in northeastern Washington State.

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