David Folkes is a Senior Principal Environmental Consultant based in Colorado with more than 35 years of experience focused on environmental and geotechnical consulting throughout the United States and Canada. One of the nation's foremost experts on vapor intrusion (VI) evaluation and mitigation, Dave was invited by U.S. EPA to address the national Resource Conservation and Recovery Act meetings held in 2000 and 2002 on VI issues impacting sites throughout the country.
Dave also was among the instructors for EPA's first VI mitigation guidance and training seminars, held in 2002 and 2003. As a member of the Interstate Technology and Regulatory Council (ITRC) VI Team, Dave helped develop the council's 2007 guidance and then served as an ITRC instructor for state and federal regulatory officials between 2008 and 2011. He remains a member of the ITRC's Petroleum VI Team.
He has served as a consultant to industry and regulatory agencies on more than 100 VI sites around the world, often providing litigation support to clients. Dave continues to direct projects for the Redfield Site in Denver, one of the largest VI sites in the country. He also provides technical assistance to the Wyoming Department of Environmental Quality, including collaborative oversight of voluntary cleanup of petroleum impacted soils and groundwater at former and active oil refinery sites, gas plants, and Brownfields sites. Other work has included design and evaluation of liner systems for impoundments.
Dave has also helped metals processing and mining companies address environmental impacts at a number of sites, including management of remedial investigations, feasibility studies, and remedial actions at the ASARCO Globe Plant in Denver; forensic investigations of the source of anomalous arsenic concentrations in surface soils in urban soils; litigation support for several class actions alleging soil contamination due to historic smelter and metals refinery emissions; assistance with Hazard Ranking System scoring issues at mining sites; and other metals-related issues.