This research presents a comprehensive statistical summary and visualization of 30 years of background metals data collected from soil and sediment samples across North Carolina CERCLIS (Superfund) sites. Developed in collaboration with the North Carolina Department of Environmental Quality (NC DEQ) and academic partners, the project offers valuable insights for environmental scientists, site investigators, and risk assessors.
NC Soil Metals Dashboard
The interactive dashboard provides customizable views of 18 background metals, including statistical summaries, boxplots, and county-level heat maps. Users can filter data by sample type, detection status, and percentile thresholds to explore trends and distributions across the state.
View the dashboard: Download Excel Dashboard (Note: Some features may require the latest version of Microsoft Excel.)
User Guide & Methods
For detailed instructions on using the dashboard and understanding the statistical methods behind the data, refer to the accompanying documentation:
This guide outlines how non-detects, flagged data, and outliers were treated, and explains the rationale behind the statistical techniques used, including Kaplan-Meier estimates and Walsh outlier testing.