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Track: Environmental Management
Charles Whitley
Division of Public Health
2 Peachtree Street
2nd Floor Annex - Room 2.509
Atlanta, GA 30303-3816
Telephone: 404-657-1947
Fax: 404-657-0602
E-mail: crw0600@ph.dhr.state.ga.us
Temporal Analysis of Private Drinking Water Wells to Evaluate Potential Well Contamination
Defining Issue: A GIS perspective of temporal distance or change over time requires a different methodology than spatial analysis since not all types of GIS data conform to a standard sense of spatial distance. GIS Solution: A GIS method is defined and developed to properly analyze and display temporal information for private drinking water wells potentially affected by the 1994 Tropical Storm Alberto flooding in Georgia. Methodology: Temporal analysis of GPS located private drinking water wells and well sampling data is used to determine the extent of aquifer contamination and detect the potential for migration of that contamination to wells previously unaffected by the 1994 Tropical Storm Alberto flooding. Software: ArcView Version 3.0, ArcInfo Version 7.0, and Spatial Analyst. Purpose of Paper: This paper describes the development and application of a spatial analysis method to evaluate the contamination of private drinking water wells due to the 1994 Tropical Storm Alberto flooding in southwest
Georgia. Large numbers of wells (up to 95% of the private wells in a county) were sampled for E. coli contamination over periods of up to 2 years. These wells were located with GPS and combined with the historical sample data to provide the base data for the analysis. Alternative methods for display of the analysis will also be addressed.
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