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This report describes Kesterson Reservoir related research activities carried out under a cooperative program between Lawrence Berkeley Laboratory and the Division of Agriculture and Natural Resources at the University of California during FY89. The primary objectives of these investigations are: Predict the extent, probability of the occurrence, and selenium concentrations in surface water of temporary wetland habitat at Kesterson; assess rates and direction of migration of the drainage water plume that seeped into the aquifer under Kesterson; monitor and predict changes in quantity and speciation of selenium in surface soils and vadose zone pore-waters; and develop a comprehensive strategy through soil, water, and vegetation management to safely dissipate the high concentrations of selenium accumulated in Kesterson soils. This report provides an up-date on progress made in each of these areas. Chapter 2 describes results of recent investigations of water table fluctuations and plume migration. Chapter 3 describes results of ongoing monitoring of soil water selenium concentrations and evaporative accumulation of selenium at the soil surface. Chapter 4 describes early results from the soil, water, and vegetation management field trials as well as supporting laboratory and theoretical studies. In Chapter 5, new analytical methods for selenium speciation are described and quality assurance/quality control statistics for selenium and boron are provided. 110 refs., 138 figs., 62 tabs.