After more than ten years of intensified activity within the field of remediation of contaminated sites, the most commonly applied remedial solution in Sweden is excavation. Today there are few alternative solutions available in Sweden, which results in high price levels and few opportunities to select techniques with respect to least negative environmental impact. Whereas alternative remediation techniques are developed in other countries, the application is limited in Sweden. The Netherlands are considered to be one of the leading countries within the field of soil and groundwater remediation. The aim of the thesis is to identify new in situ remediation techniques in the Netherlands that could be suitable to apply in Sweden. The aim is also to identify the most important opportunities and barriers to new in situ techniques in Sweden. The report focuses on techniques suitable for remediation of sites contaminated with petroleum- and chlorinated hydrocarbons. The research is based on literature studies and interviews with key persons. A case study of five Swedish and six Dutch in situ remediation projects was carried out. Finally, an investigation on the experiences of persons active within remediation branch in Sweden was carried out with means of a questionnaire. In general there is in the Netherlands a wider range of different remediation techniques available which can be applied in practice. The in situ techniques identified in this report, with no previous known application in Sweden, are: co-solvent or surfactant flushing, LINER, six- phase heating, electro bio reclamation, electro kinetic bio screens, in situ chemical oxidation with C-sparge and perozone. None of the techniques can be excluded to be suitable to apply in Sweden with respect to environmental criteria such as soil structure, since the environment is unique at each specific site. The variation of the site- specific environment is great between different sites in Sweden. All the techniques have, at appropriate environmental conditions, the ...