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Assessment of the re-use of soil and sediments in deep freshwater pools : Site-specific assessment factors

Beoordelen grootschalige bodemtoepassingen in diepe plassen : Elementen voor generieke en locatiespecifieke beoordeling

Synopsis

The large scale re-use of soil and sediments for the reconstruction of deep freshwater pools can affect the quality of groundwater and surface water, particularly when slightly contaminated soils and sediments are re-used. The quality criteria and assessment methods proposed in this report can be used by policy-makers to assess these potential effects. The implementation of these methods in a stepwise approach can provide the means to ensure that the quality standards set for groundwater and surface water are still met, in the case that soils and sediments contaminated with metals, organic contaminants and nutrients are used. More knowledge is especially needed to facilitate the development of methods that can determine - with an acceptable level of certainty - the amounts of these compounds that will be released into the (ground)water. These are the results of a survey carried out by the RIVM in collaboration with the Deltares Institute and the Energy Research Centre of the Netherlands (ECN), by order of the Ministry of Housing Spatial Planning and Environment (currently the Ministry of Infrastructure and Environment). Substantial parts of this survey were used for the 'Guidance for the reconstruction of deep freshwater pools', which was implemented according to the Ministerial circular on deep freshwater pools . The survey report also provides substantive background information on this Guidance as well as the principles on which it is based. The proposed assessment methods provide the basis for a systematic procedure which guarantees that the goals of the European Water Framework Directive and Groundwater Directive will be met. With the implementation of the Dutch Soil Quality Directive, a permit issued by provincial level authorities is no longer necessary for activities involving the use of slightly contaminated soil and sediments. The report describes the assessment criteria to be met for groundwater and surface water, the measurement methods of available concentrations, a geohydrological dilution factor, a distance to (drinking) water well and groundwater-dependent ecosystems criterion and the backgrounds of these methods. The report concludes with recommendations on how to reduce the knowledge gap in order to achieve a generic assessment framework in the future.
 

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