Abstract The Safe Drinking Water Act of 1974 established state Underground Injection Control (UIC) programs for regulating the subsurface emplacement of fluids through injection wells. This paper outlines the development of a GIS-based underground injection well database for the state of Wyoming, including: 1) methodology and techniques employed, 2) database design, and 3) creation of data analysis applications for groundwater vulnerability assessment. The primary purpose for developing this GIS database was to determine geographic locations for 6,700 injection wells in Wyoming to aid in assessing their potential as point sources of groundwater contamination. Database development required the integration of multiple data automation techniques, including map digitization and address geocoding. The database structural design includes a combination of "one-to-one" and "many-to-one" relational database components, incorporating the Environmental Protection Agency's newly established Minimum Set of Data Elements for Groundwater Quality, the UIC State Minimum Data Set and the Federal UIC Reporting System. Preliminary examples of groundwater vulnerability assessment applications being explored include an integration of the GIS with statewide groundwater sensitivity mapping efforts. The database will also be utilized for other state and local groundwater protection efforts in Wyoming, including wellhead protection programs and regulation of RCRA and Superfund sites.
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