I have 40 years of experience and specialize in the field of geochemistry and hydrology with specific knowledge in the areas of mine impacts, hydrocarbons and solvents, and radiological contaminants. I have published on such topics as exploration geochemistry, control of acid-rock drainage and metals leaching, and land-use practices and impacts on water quality. I have testified 7 times on topics such as allocation of contamination from multi-party sites, effective design of monitoring programs and baseline water-quality conditions prior to mining.