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In the last years contaminated sites have become a relevant problem in the Federal Republic of Germany because there exist a large number of these sites. That's why in Germany more intensive efforts are undertaken in order to start necessary remediations. Basic initial conditions for an effective execution of these works are on the one side a systematic registration of these sites and on the other side the creation of a uniform evaluation capability for the assessment of environmental hazards. Regarding this background the Research Centre Rossendorf (FZR) together with Nuclear Engineering and Analytics, Inc. Rossendorf apply and modify the computer code system XUMA (German synonym for expert system on environmental hazards of contaminated sites) which is a joint project of the Institute for Applied Information Science of the Karlsruhe Nuclear Research Centre and the State Institute for Environmental Protection of Baden-Württemberg. XUMA is a knowledge based computer system, which shall support the staff of the responsible governmental offices in the uniform evaluation of the hazard potential, the preparation of analysis plans, and the assessment of contaminated sites and mines. To enable the registration and evaluation of contaminated sites at engineering offices FZR developes an interface program which can be generated automatically from the knowledge base of the expert system XUMA. This interface program can be executed at each IBM-compatible PC without any additional runtime environment.

A knowlegde-based strategy for the evaluation of risks produced by contaminated sites is presented, which also gives a ranking for the temporal sequence of remediation. This strategy supports the responsible government offices. It is based on the Saxonian evaluation method for contaminated sites and is implemented in the computer programs XUMA and GEFA.

A computer system is presented which will be an effective support for the Saxonian government offices responsible for the evaluation of contaminated sites and the decision concernig the kind of remediation. This system XUMA (German synonym for expert system on environmental hazards of contaminated sites) includes a knowledge base with the principal methods for handling contaminated sites. The main features of XUMA are: Evaluation of contaminated sites, Creation of analysis plans, Assessment of contaminated sites, Knowledge acquisition tool and Explanation capability. Furthermore XUMA's embedding into environmental IT-systems in Saxony is described.

The possibilities to evaluate radioactive contaminated sites with knowledge-based methods are discussed on the basis of a knowledge-based evaluation system for non-radioactive sites. The discussion treats methodical and programming aspects.

A concept for the use of decision-analysis in planning local energy distribution systems is introduced. The concept is based on the coupling of multiple independent modules, what enables the finding of a solution optimum in cost and environmental compatibility by variation of boundary conditions and input parameters. The first modul is presented.