This manual is designed for use in the laboratory portion of an undergraduate course in hydrogeology or groundwater engineering. At CSM, these exercises are used in a three-hour lab that accompanies three lectures per week for one semester. Most of the lab exercises can be used in any sequence, but they should be coordinated with lectures because they both supplement and complement lecture topics in hydrogeology. Two of the labs should be done in a laboratory that has water and sink drains, where you will be working with apparatus to measure hydraulic properties of porous media. One lab period will be spent observing an aquifer test in the field. Several of the labs incorporate tasks that are best performed on personal computers, and the three contaminant labs are best run in a computer lab unless students have portable computers. Data files are provided on the enclosed CD that can be input to spreadsheet programs for easier calculation. The numerical model PARTICLEFLOW (used in Lab 15) requires a computer. The final labs consist of an extended problem that should be spread over three lab periods. There are two choices of problems for this capstone mini-project: (1) The Seymour Hazardous Waste Site problem is a structured series of three labs that deals with the hydrogeology of a contaminated aquifer in the humid midwestern United States; (2) the Groundwater Basin Analysis is a quite open-ended problem, with emphasis on determining the interaction of surface water and groundwater in an arid area and predicting the future of irrigation in the basin. Some of the exercises used in the Manual have been so modified over the years that it's difficult to recognize their origins, but parts of some of the exercises are based on material from colleagues at CSM and Stanford University. I thank the students and teaching assistants who helped test and refine these exercises. The Manual was improved considerably by helpful criticism provided by Professors Regina M. Capuano, University of Houston; David Huntley, San Diego State University; James A. Saunders, Auburn University; H. Leonard Vacher, University of South Florida; and several anonymous reviewers. Keenan Lee A complete hydrogeology course should include a lab as well as lecture. Until now, faculty members have been forced to develop their own custom lab manual, as no commercial manual was available. I was excited to learn of Keenan Lee's plans to publish a hydrogeology lab manual, and I was especially pleased when he invited me to contribute lab exercises from the Seymour Recycling Corporation hazardous waste site. Hydrogeology is best learned through a hands-on approach. The material in this lab manual, in combination with the end-of-chapter problems found in textbooks, will aid students in developing a deeper appreciation for the science and art of hydrogeology. C. W. Fetter The physical and chemical processes that govern groundwater flow and contaminant movement in the subsurface have remained unchanged through time. Our understanding of these processes, however, and our philosophy about which processes should be incorporated into a course in subsurface hydrology, change over time. Two areas that have certainly gained much attention from academicians and practitioners alike during the last ten years are contaminant transport and computer modeling. When Keenan asked me to contribute some exercises on these two topics, I was grateful for the opportunity. I realize that only a few hydrogeology textbooks include detailed material on contaminant transport or on computer modeling, but contaminant transport theory and application commonly comprise up to half of the material in a university course in subsurface hydrology. Some departments offer two semester courses: a traditional course in hydrogeology and a follow-up course in contaminant transport. The three new contaminant transporLee, Keenan is the author of 'Hydrogeology Laboratory Manual', published 2002 under ISBN 9780130465498 and ISBN 0130465496.