Mike Gefell is a Principal Scientist at Anchor QEA in Lakewood, CO. He has 33 years of experience in site characterization, quantitative hydrogeology, groundwater modeling, NAPL mobility assessment and remediation at MGP sites across the US, with extensive experience in uplands and sediments. He is an Associate Editor of Groundwater journal and was acknowledged for his contributions to recent ASTM guidance regarding NAPL mobility in sediments.