Opal provides technical and field support for projects related to groundwater supply development, management, and planning. While at the U.S. Geological Survey, she focused on the Groundwater Ambient Monitoring and Assessment Program-Priority Basin Project, a comprehensive assessment of groundwater quality across California. Her work included groundwater and surface water sampling, target sheet development, well canvassing, water quality sampling, water level measurements, laboratory testing, and analysis of well completion reports.