Learn how careful logging/data collection benefits contractors and scientists alike during the premier presentation of the 2009 NGWREF McEllhiney Lecture. Fundamental to any drilling contractor's business, there are many uses for boring/well logs including specifying location, ground water levels, chemistry, and production capabilities—information used routinely by government and regulatory agencies, consultants, and academics. Beyond these usual uses, however, boring/well log information may be used for hydrostratigraphic interpretation, ground water modeling, subsurface investigations, and general background information. In fact, through careful logging and data collection, both contractors and scientists can work together to develop better subsurface models that will help everyone in the industry. (The McEllhiney Lecture Series is underwritten by Franklin Electric Co.)