Forurenede gasværksgrunde. Udredningsrapport U4 : Lossepladsprojektet

The purpose of this report is to make a statement of the experience in pollution on gasworks-sites. The report states the investigation work carried out in Denmark and moreover the report gives a description of the gasproduction and the pollution involved with gasproduction. The report describes experiences of investigations on the basis of a case at Odense Gasworks-sites in order to give a more specified description of the situation as to pollution of the soil and the diffusion of the pollution of the ground water.

Description of soil samples, programmes and methods of analyses are discussed as an important part of the investigations. The best methods of investigation and analyses available today are described for the most important and common kinds of contaminants. Recommendations for an analysis programme is given as well.

On developed gasworks-sites pollution with tar instance for can cause problems to the indoor climate. General statements and experiences from the Netherlands and 6 Danish investigations are presented. On the basis of the results of the analyses a risk assessment is elaborated and accept criteria of the appliclation of the site in question is determned.

Tools for risk assessment are described as well as experiences and examples of the accept criteria applied. Today a number of different remedial action technologies are available and they can be used for cleaning up gasworks-site. Foreign experiences of remedial action technologiea are summarised and finally two Danish remedial technologies are described.

The two Danish technologies in question are wet oxidation and a semimobile treatment plant based on gas/liquid extraction. (author).