Dennis Powers is a Consulting Geologist with over 45 years of experience in the fields of geology and hydrogeology. A Professional Geoscientist in the State of Texas, he specializes in the detailed interpretation of subsurface data from geophysical and geological logs, and integration with surface geology or other available data, to evaluate stratigraphic and lithofacies relationships. Since 1975, Dr. Powers has been directly involved in studies of the geology and hydrology of rocks in the Delaware Basin and adjacent regions. He has examined and interpreted thousands of geophysical logs for these studies and provided expert testimony at hearings, and is experienced interacting with a variety of review and oversight organizations. Dr. Powers has completed studies of the stratigraphy and lithofacies of formations within the Delaware Basin as well as across the Capitan Reef Complex Aquifer area and back-reef shelf. This work has included interpreting more than a thousand geophysical logs to detail the stratigraphy, structure, and lithofacies of the Permian Rustler Formation and supporting new drilling, coring, and geophysical logging programs related to oil and gas exploration and water resource evaluations. In two other studies, he has interpreted additional geophysical logs to investigate structure and lithofacies extent as potential indicators of halite dissolution. He has evaluated subsurface formations in the Permian Basin in southeastern New Mexico and much of west Texas as alternate sources of groundwater to serve industrial purposes. For several oil and gas clients, Dr. Powers has recently developed lithological cross sections from ground surface to depths of 2,000 to 5,000 feet. He provided the geological interpretation of thousands of geophysical logs for the Rustler GAM for the TWDB. He has interpreted thousands of additional geophysical logs of the Dockum and related formations across west Texas and has prepared dozens of cross-sections as part of proprietary studies. Since 2000, Dr. Powers has variously had responsibility for drilling, coring, logging, completing, and reporting on more than 20 shallow wells (< 2,000 feet deep) that commonly intercept or completely penetrate Dockum formations. He has published more than 125 reports and articles related to his work. Of these, at least 100 are directly based on investigations of the geology of the Delaware Basin.