Construction of maps for soil recycling in regional infrastructural works integrating soil-quality laws

A soil-quality map is at present an important tool to integrate laws on soi l quality with regional infrastructural works. Basic data are commonly avai lable, but soil quality is an indicator that has to be derived from these d ata, including site-specific environmental standards. We propose three geos tatistics-based methods for the comparison of interpolated contaminant conc entrations and standards. The study is illustrated by data from a part of the Betuwe railroad transec t, which extends over 12 km in the western Netherlands. As it turns out, a useful procedure is to combine interpolated contaminant concentrations with interpolated threshold values.