Austria´s New Assessment Method for Remediation Options

Following an extensive literature review, available assessment methods and tools were evalu-ated regarding suitability, transparency and flexibility. A modified Cost-Effectiveness-Analysis (MCEA) was identified as the most appropriate assessment method. Classical CEA are com-monly used in the public sector to identify the most advantageous among different options. Ide-ally, it is the alternative combining least costs with the highest effectiveness in fulfilling specific objectives. Since 2012 the application of the developed assessment tool based on MCEA is mandatory when performing a remediation options appraisal.
In a first step the remediation options to be assessed have to be selected. Based on a pre-screening of potentially applicable technologies (or combinations of technologies), those have to be identified, which have the potential to meet the remediation target. Given this minimum re-quirement, options to be assessed have to be suitable in technical and legal terms, too.
MCEA consists of an effectiveness assessment on the one hand and an assessment of corre-sponding costs on the other hand. Effectiveness assessment displays the effectiveness values of an alternative regarding different objectives. Summing up the weighted values according to the objectives leads to a total effectiveness value for each alternative. The costs of an alternative are assessed in monetary terms. Finally MCEA provides a total effectiveness-cost-ratio for each op-tion enabling a ranking of options.
One major prerequisite to perform an effectiveness assessment when applying MCEA is the definition of a set of objectives or goals to be fulfilled by the different options. Austria’s rele-vant stakeholders in contaminated site management have been involved in a process resulted in a hierarchical system of goals consisting several levels. The goals of the uppermost level („overall objectives") and their weighting were derived from national laws, guidelines and other relevant documents:
- Objective 1: „Ecology" (Weight 60 %): Maximizing the ecological benefit,
- Objective 2: „Local Development" (Weight 20 %): Improving the framing conditions for local development and
- Objective 3: „Project Stability" (Weight 20 %): Maximizing further aspects (in addition to ecology, economy and local development) of sustainability.