Report, "Modeling Solute Transport in Groundwater," by Leonard F. Konikow, in Proceedings International Conference on Environmental Sensing and Assessment, September 14-19, 1975, Las Vegas, Nevada, Paper 20-3, 6 p. UNITED STATES DEPARTMENT OF THE INTERIOR GEOLOGICAL SURVEY RESTON, VIRGINIA 22092 May 26, 1976 GROUND WATER BRANCH TECHNICAL MEMORANDUM NO. 76.08 Subject: PUBLICATIONS - Report, "Modeling Solute Transport in Groundwater," by Leonard F. Konikow, in Proceedings International Conference on Environmental Sensing and Assessment, September 14-19, 1975, Las Vegas, Nevada, Paper 20-3, 6 p. The subject report provides an excellent example of the employment of hydrogeologic reasoning and mathematical modeling to develop a predictive capability for toxic waste movement through a water- table aquifer near Denver Colorado. Waste movement was controlled by the configuration of the underlying bedrock surface. In places the alluvium overlying bedrock high was unsaturated and flow was confined to the valleys between the bedrock highs. The waste movement has been observed in the field for 20 years. The historical data were used for verifying the solute transport model which was solved by using the method of characteristics. (s) Leonard A. Wood Coordinator, Subsurface Waste Attachment WRD Distribution: A, FO-L, S