Nathan Starr is a senior project manager and licensed geologist in Washington and California. He has more than twenty years’ experience in contaminant hydrogeology and cleanup. He has conducted site characterization and hydrogeologic assessments, including numerical groundwater modeling for both regional groundwater and localized transport studies. He also has conducted human health risk assessments, fate and transport analysis and technical review of regulatory documents on projects under the requirements of the Comprehensive Environmental Response, Compensation and Liability Act; Resource Conservation and Recovery Act and Washington State Model Toxics Control Act. Nathan has provided technical support for a number of cost allocation projects with multiple responsible parties. He has expertise and proven success in mediation and litigation support for numerous projects. Nathan believes that a clear, concise conceptual site model is the cornerstone of a successful project. Outside of work, Nathan is an avid outdoorsman, climb leader and safety officer for the Mountaineers.