Biotechnology / b : Environmental processes ; 2. Soil by Jürgen Klein

Biotechnology / b : Environmental processes ; 2. Soil by Jürgen Klein

By Jürgen Klein

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Additional resources for Biotechnology / b : Environmental processes ; 2. Soil decontamination

Sample text

In the atmosphere vapor is condensed into ice crystals or water droplets, which precipitate as snow, hail, or rain. A part of this precipitation evaporates and returns to the atmosphere. Another part flows across the ground surface to the next river and to the ocean at last. The rest infiltrates the ground and creates the groundwater body. This groundwater can return to ground surface through springs or it can flow to the next stream and with this to the ocean. During this cycle the form of water may change, but the total amount of water in or on the Earth and in the atmosphere remains the same.

14 Remediation Goals The most ambitious goal of restoring soil multifunctionality is pursued only in few countries, above all inThe Netherlands where this is explicitely stated as policy. Most countries regard as sufficient compliance with action thresholds and in particular reaching soil quality as defined by the intended use and the protection of sensitive targets. Remediation goals are usually based on individual assessments which are frequently supported by lists of soil quality values. However, in some cases a certain preference for thorough clean-up is established by issuing remediation certificates and, more important, by delisting remediated sites only on condition that multifunctionality has been restored.

Logical damage Use of bioindicators for assessing risk direct assessment preferable, reflecting the soil protection objective of removing and preventing health hazards 1 Introduction 33 Tab. 12. , best with clear conception of priority setting the Canadian NCS model scheme Structuring the political procedure for setting priorities 0 prestructuring decision making procedures in order to improve transparency Targets and Execution of Remediation Equality of remediation goal to action reflects the traditional approach of combatting the problem causthreshold, as a rule, remediation goal to ing risks as far as to keep remaining risks acceptable be modified only by risk assessment accounting for intended use of the site Equivalence of decontamination and containment if Dutch IBC criteria are observed definition of demanding quality criteria for containment, which may provide an incentive for permanent solution Check of containment efficiency every 5 years minimum requirement Registration of use restrictions in land register incentive for full remediation Conception of dependence of remediation goals on layers to be cleaned up decontamination of upper layer with a view to the intended use; clean-up of deeper layers to levels complying with industrial use; groundwater should be protected in any case Principle of assigning first priority to preventing hazards to residents, second priority to preventing hazards to workers in pursuit of the objective of remediation, namely to protect human health In emergencies, facilitation of authorization procedure for time-limited interim storage for contaminated soil facilitation of administrative procedures for time limited emergency measure Certificating and delisting of the site if multifunctionality of contaminated soil has been restored relief of authorities from book keeping on the one hand, proof of success on the other hand; if maximum remediation goals are achieved, certificate will put the authorities at risk on equal terms with private economy and citizens 34 1 Contaminated Soil Areas, Different Countries and Contaminants,Monitoring of Contaminants Tab.

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