|Mapping techniques used in this project|
The county-level maps depict the average concentration of a contaminant in each county. The average was calculated by adding all of the well-testing results for a particular contaminant in each county and dividing the sum for each county by the number of samples collected in that county. View the county statistics to find out the number of wells tested in each county as well as the minimum, maximum, and average concentration of each contaminant.
The county-level averages reported for each contaminant are based on private well tests from the North Carolina State Laboratory of Public Health from 1998-2010. A county-level map is also available for all well-testing results during the year 2010.
In addition to the average concentration of each contaminant, the county-level maps include National Priorities List sites in which the specific contaminant has been detected and regulated facilities that have reported transport or release of the specific contaminant in the Toxics Release Inventory.
Advanced TrAC maps
The TrAC project also utilized advanced mapping and geospatial techniques to generate maps of tetrachloroethylene (PCE) and arsenic contamination in North Carolina. Using the Bayesian Maximum Entropy (BME) framework, Land Use Regression modeling, and Geographical Information Systems (GIS), the maps provide spatiotemporal predictions of the concentration of contaminants in groundwater. More information about BME analysis and projects can be found at The University of North Carolina at Chapel Hill's BME Lab website.
View information about a study of arsenic contamination in North Carolina that uses advanced spatial mapping techniques.
View a moving map of tetrachloroethylene (PCE) contamination in North Carolina that uses advanced spatial mapping techniques.
|Last updated January 14, 2013|