The Contaminant Data Display and Download Tool (CD3) is a multifaceted data distribution and visualization system, available to all site visitors at no cost. It displays data from SFEI/ASC’s Regional Data Center, aggregating data across a wide array of projects, programs, years and geographic areas. New datasets are frequently added into a user-friendly interface that includes detailed instructions, tips and metadata notes, and data standardized to California Environmental Data Exchange Network’s (CEDEN) business rules.