A COMPARATIVE EVALUATION OF SUSTAINABLE REMEDIATION APPLIED AT THE PHASE OF CHOOSING TECHNIQUES ON THE CVOC-CONTAMINATED SITE UNDER EXISTING FACTORIES

 There is considerable fear of further increase of brown field in Japan because of the growing proportion of elderly population and the fall in land prices. Reduction in cost of counter measures or the securement of remediation quality seem to be urgent matter, however high cost excavation of contaminated soil or the long term pump and treat of groundwater are still chosen at many chlorinated volatile organic compounds (CVOC)-polluted sites. In this research, by using the site case study polluted by CVOC under the existence building, we compared the sustainable approach, which is relatively new evaluation strategy, with risk based approach and cost based approach. Six of countermeasure techniques included excavation, anaerobic biostimulation using vertical wells, in-situ chemical oxidation, anaerobic biostimulation using slant wells, monitoring, pump and treat. It was possible to evaluate the various output parameters of environmental, social, economic aspects by using sustainable approach. Only sustainable approach could compare the risk of remedy works, which include the risk of traffic accidents, with carcinogenesis risk (health risk) of CVOC. In addition, this approach could only estimate the benefit of future land use by attending the profit-earning ratio of land through or after the remedy work of considered six techniques. On the other hand, difficulty of the decision-making by numerous indexes and necessity of an integration index was considered to be the problem of sustainable remediation in the future.