GERMAN ATV-DVWK-RULES AND STANDARDS
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1 GERMAN ATV-DVWK-RULES AND STANDARDS ADVISORY LEAFLET ATV-DVWK-M 503E Basic Information on Investigation and Remediation of Tailings Impoundments
2 GERMAN ATV-DVWK-RULES AND STANDARDS ADVISORY LEAFLET ATV-DVWK-M 503E Basic Information on Investigation and Remediation of Tailings Impoundments Joint Advisory Leaflet by the German Association for Water, Wastewater and Waste (ATV-DVWK) German Society for Geotechnical Engineering (DGGT), and the German Committee on Large Dams (DTK)
3 The German Association for Water, Wastewater and Waste, DWA (former ATV-DVWK), is the spokesman in Germany for all universal questions on water and is involved intensely with the development of reliable and sustainable water management. As politically and economically independent organisation it operates specifically in the areas of water management, wastewater, waste and soil protection. In Europe the DWA is the association in this field with the greatest number of members and, due to its specialist competence it holds a special position with regard to standardisation, professional training and information of the public. The ca. 14,000 members represent the experts and executive personnel from municipalities, universities, engineer offices, authorities and businesses. The emphasis of its activities is on the elaboration and updating of a common set of technical rules and standards and with collaboration with the creation of technical standard specifications at the national and international levels. To this belong not only the technical-scientific subjects but also economical and legal demands of environmental protection and protection of bodies of waters. Imprint Publisher and marketing: DWA German Association for Water, Wastewater and Waste Theodor-Heuss-Allee 17 D Hennef, Germany Tel.: Fax: Internet: kundenzentrum@dwa.de Translation: BMU Printing (English version): DWA ISBN-13: ISBN-10: The translation was sponsored by the Federal Ministry for the Environment, Nature Conservation and Nuclear Safety of Germany (BMU). Printed on 100 % Recycling paper. DWA Deutsche Vereinigung für Wasserwirtschaft, Abwasser und Abfall e.v., Hennef 2006 (DWA German Association of Water, Wastewater and Waste) All rights, in particular those of translation into other languages, are reserved. No part of this Advisory Leaflet may be reproduced in any form - by photocopy, microfilm or any other process - or transferred into a language usable in machines, in particular data processing machines, without the written approval of the publisher. 2
4 Preamble to the English translation: The German original of this paper was already published in. In the meantime the work of the Committee on Tailings Dams and Waste Lagoons of the ICOLD has been updated. The additional bulletins which have resulted in this connection are in particular to be mentioned: Bulletin No. 121: Tailings Dams Risk of Dangerous Occurrences. Lessons learnt from Practical Experience, Bulletin (ICOLD/UNEP in preparation): Increasing Tailings Dams Safety: Critical Aspects of Management, Design, Operation and Closure. The bulletins mentioned result with the background of the fact that damage and catastrophic disasters in connection with tailings impoundments continue to be deplored. With regard to the various aspects of the safety of tailings impoundments in particular in the construction and operation phase attention is drawn to the latest ICOLD Bulletins as a whole and also to the previous editions. This paper resulted under the specific conditions as they exist in large parts of Europe and especially in Germany and which are characterised by a decrease in mining activities. Accordingly, emphasis has here been placed on aspects of decommissioning as well as on preservation and long-term safety. The paper as a whole has nevertheless to cover the subject broadly. This has prompted the German Association for Water, Wastewater and Waste (DWA) to produce an English language version. Josef Brauns December
5 Foreword Tailings impoundments also known regionally as clarification ponds or sedimentation ponds, and referred to throughout the former Eastern Germany as industrial settling facilities are frequently a special form of dam systems. There is little literature available in German on the state of the art for such facilities. By present-day standards and in certain respects, tailings impoundments may also be regarded as equivalent to landfill sites, for which regulations now exist from quite different quarters. Today the recognised rules on the state of the art for tailings impoundments are set out in DIN and insofar as is appropriate for such facilities DIN (General Specifications) (work on a revised version is currently in progress). In the former GDR the most recent set of rules for industrial settling facilities was introduced by statute in 1988 (Law Gazette 1998/I/2). In view of the nature of their structure and the way they are operated, and also because of the nature of the sediments deposited, tailings impoundments may present hazards for humans and the environment. This was made abundantly clear by the disastrous accident at Stava (Upper Italy; failure of two successive tailings impoundments with 268 deaths in July 1985) and the catastrophic environmental damage caused by the failure of the Los Frailes facility in Spain in April 1998 and the escape of water containing large amounts of cyanide from a pond near Baia Mare (Romania) in January There are a large number of facilities of various sizes and various ages. In some places there is seen to be a need for inspections, which can give rise to remediation requirements, or in old facilities to measures designed to ensure sustainable safe integration in the environment. The present set of rules is not adequate for this purpose. For this reason the German Association for Water, Wastewater and Waste (DVWK) set itself the task of drawing up guidelines on the inspection and remediation of tailings impoundments. These guidelines are not intended primarily as an overview of current knowledge in this field; they are rather designed to assist in the task of inspection and assessment, and also remediation, of tailings impoundments and the methodical approach that is necessary for this purpose. They may nevertheless also be helpful when planning new facilities. This publication on Basic Information on Inspection and Remediation of Tailings impoundments is the result of an initiative by the DVWK Expert Committee on Dams and was prepared by a working group with members drawn from the ATV-DVWK, the German Society for Geotechnical Engineering (DGGT) and the German Committee on Large Dams (DTK). The focus of this advisory leaflet is thus on plant safety from a constructional and hydraulic engineering point of view. It nevertheless seeks to devote adequate space to the environmental aspects of such facilities which are receiving increasing recognition. In view of the rapid pace of developments in the field of waste management, waste legislation and the fast-growing regulatory systems in this sector, and also the considerable time taken to compile this publication, this was bound to meet with limited success. The working group nevertheless hopes that this advisory leaflet, the contents of which are primarily keyed to existing plants, whether still in service or decommissioned, will prove a useful guide for owners and operators of tailings impoundments and for technical specialists, inspecting experts and approval authorities. 4
6 The following persons took part in the preparation of this advisory leaflet: BRAUNS, Josef DRESBACH, Michael GERBOTHE, Dagobert HÖTZL, Heinz KAST, Karl KONOLD, Werner PÖTZSCH, Manfred SCHAEF, Hans-Jürgen STALMANN, Volker Prof. Dr.-Ing., Abt. Erddammbau und Deponiebau, IBF, Universität Karlsruhe, Karlsruhe (Chairman) RBR, Dipl.-Ing., Bezirksregierung Arnsberg, Arnsberg Dipl.-Ing., Ingenieurbüro Tief- und Wasserbau GmbH, Dresden Prof. Dr., Lehrstuhl für Angewandte Geologie, Universität Karlsruhe, Karlsruhe Dr.-Ing., Karl Kast und Partner, Ingenieurgemeinschaft für Umwelt- und Geotechnik, Ettlingen Prof. Dr., Institut für Landespflege, Universität Freiburg, Freiburg Dipl.-Ing., Landestalsperrenverwaltung des Freistaates Sachsen, Pirna Dr.-Ing., Ingenieurbüro, Dresden (Vice-Chairman) Dr.-Ing., Beratender Ingenieur, Essen Assistance was also given by the following: JÄGER, Werner NEUBER, Friedrich SCHRENK, Georg WATTENDORF, Peter WEISS, Herbert Dr.-Ing., Ingenieurbüro Tief- und Wasserbau GmbH, Dresden RBOAR i. R., Dipl.-Ing., Arnsberg (vormals Bezirksregierung Arnsberg) Dipl.-Geogr., Abteilungsleiter, ATV-DVWK Deutsche Vereinigung für Wasserwirtschaft, Abwasser und Abfall e.v., Hennef Dipl.-Agr.Biol., Institut für Landespflege, Universität Freiburg, Freiburg BD Dipl.-Ing., Bayerisches Landesamt für Wasserwirtschaft, Munich Karlsruhe, September 2001 Josef Brauns 5
7 Contents Preamble to the English translation:... 3 Foreword... 4 List of illustrations... 7 List of tables... 8 User Notes Introduction... 9 Author s afternote General Special features of tailings impoundments Pond types and construction methods for dam structures Classification of substances in slurry Legal situation Potential hazards and safety General Size, type and situation of pond in environment Composition and risk relevance of sediments in terms of substances Potential hazards due to substances Composition of solids Important properties of solids Composition of slurry liquids and seepage water Facility-specific hazard assessment Engineering and hydrogeological site conditions Importance of geological features Load-bearing capacity, permeability situation and transmissivity Earthquake effects Scope of engineering and hydrogeological investigation Meteorological and hydrological site conditions Introduction to problems Components of the water balance Heavy rainfall Hydrology and runoff control Technical control of pond inflow Inflow for tailings impoundments still in service Inflow for tailings impoundments no longer in service Impounding structure and stability issues Shape and design Technical failure Operating, safety and monitoring facilities Operating facilities Dewatering facilities (drains and filters) Measuring and monitoring equipment Possible impacts of substances on the surroundings General Water route Air route
8 2.9.4 Bio route Integrated assessment of hazards Investigation procedure Preliminary remarks Screening the existing data Safety assessment Remedial measures General Ponds currently in service Decommissioned ponds Preservation of decommissioned tailings impoundments General Protection concepts for long-term preservation of decommissioned tailings impoundments Closing remarks Bibliography List of illustrations Fig : Pond types for settling facilities Fig : Construction methods for tailings impoundment impounding structures Fig : Slurry discharge along impounding structure with formation of a beach Fig : Construction of an impounding structure from slurry solids with the aid of cyclones Fig : View of a tailings impoundment with retaining dam Fig : Tailings impoundment with high hazard potential in extremely sensitive setting Fig : Tailings impoundment with low hazard potential in low-sensitivity setting (slurry discharge into a former pit-type quarry) Fig : Trends in behaviour of important soil physics parameters of the body of sediment in relation to distance from discharge area Fig : Schematic diagram of water balance of a settling pond Fig : Suggested decision tree (schematic) for determining the need for action with regard to flood water diversion (e.g. for a valley cutoff tailings impoundment) Fig : Main components of water balance of tailings impoundments in service, depending on pond type Fig : Requirements for diversion of extreme water inflows to ensure compliance with maximum permitted pond water level (schematic) Fig : Dam, tailings impoundment with slurry discharge at any desired point Fig : Tailings impoundment with impounding structure made largely of sediment material Fig : Tailings impoundment with impounding structure of mixed construction Fig : Investigations with vane test apparatus to determine the shear strength of discharge shore sediments Fig : Tailings impoundments based on Fig with saturated discharge shore and seepage flow under anisotropic permeability conditions in the body of sediment Fig : Schematic example illustrating various failure mechanisms Fig : Cross-section through a pond with peripheral dam of low-permeability material (example of a damaged dam) Fig : Safety review method for a tailings impoundment
9 Fig : Drainage pipes installed by later drilling to intercept seepage water in the impounding structure Fig : Making an impounding structure safe by means of permeable fill on downstream side (frontal ballast) Fig : Fundamental redesign of a tailings impoundment to create stable conditions (example, schematic) Fig : Water retention dam on a discharge shore to be protected from submergence Fig : Development of pollutant emissions from tailings impoundments with polluted content (schematic) Fig : Preservation concept for a tailings impoundment with largely inert constituents (schematic) 54 Fig : Tailings impoundment containing soluble pollutants, covered for long-term preservation (schematic) List of Tables Table 2.2-1: Size, type and location features and their influence on the hazard potential of tailings impoundments Table 2.2-2: Type of use of neighbouring area and resulting needs for protection Table 2.5-1: Examples of precipitation for 12 h duration and for 100-year repeat probability, after KOSTRA and the maximised district rainfall figures for selected regions (summer figures) Table 2.6-1: Assessment scheme for water levels in Fig Table : Criteria for integrated hazard assessment of a tailings impoundments Table 4.2-1: Remediation measures for deficits connected with clear water area
10 User Notes This Advisory Leaflet is the result of honorary, technical-scientific/economic collaboration which has been achieved in accordance with the principles applicable therefore (statutes, rules of procedure of the ATV- DVWK and the Standard ATV-DVWK-A 400). For this, according to precedents, there exists an actual presumption that it is textually and technically correct. The application of this Advisory Leaflet is open to everyone. However, an obligation for application can arise from legal or administrative regulations, a contract or other legal reason. This Advisory Leaflet is an important, however, not the sole source of information for correct solutions. With its application no one avoids responsibility for his own action or for the correct application in specific cases; this applies in particular for the correct handling of the margins described in the Advisory leaflet. 1 Introduction Author s afternote A majority of failures have been due to inadequate attention being paid to decant and overflow systems. Through the many years of construction there can become partly inoperative leading to rising water level, causing rising piezometric levels within the retaining dam structure causing collapse. In extremes the structure may be overtopped. Bulletin No. 121 gives many causes of failures and should be considered in relation to the wording of this advisory leaflet. [See Incident No. 194, p 99 of Bulletin No. 121] 1.1 General Tailings impoundments are (according to DIN and DIN ) impounding systems with impounding basins whose sole purpose is to retain solids suspended in liquid. This implies systems for mostly permanent disposal of residues produced in large quantities and over lengthy periods in connection with the extraction of raw materials or in the course of other technical processes (e.g. burning of coal). Depending on the circumstances, such systems may also include systems for capturing solids that are retrieved at regular intervals from the relevant basins. By contrast, wastewater ponds for the treatment of municipal wastewater are not counted as tailings impoundments. In view of the economic sector in which they are classified, the tailings impoundments meant here were known in the former German Democratic Republic (Eastern Germany) as industrial settling facilities, for which rules were laid down in the Order on Industrial Settling Facilities of December 1987 (Law Gazette 1998/I/2). The present document consistently and exclusively uses the term tailings impoundments. Depending on how tailings impoundments are integrated in the hydrological environment in the individual case, and also depending on the different legal situations in the German Länder (states), tailings impoundments have been or still are treated and approved in accordance with operating plan procedures under mining law or in accordance with procedures under water law or in view of their landfill character waste law (cf. in this connection Section 1.5). As a result of the historical development and the present state of the raw materials industry, the tailings impoundments that exist in Germany today are mostly old tailings impoundments that are no longer in use; a number of facilities are still operating and will continue to do so indefinitely. Only a comparatively small number of new facilities are being planned and built, namely in the fields of limestone washing, gravel washing, coal dressing and the sugar industry. Tailings impoundments constitute encroachments on the natural environment and have a certain hazard potential in view of the quantities and substances accumulated in the relevant impounding systems. The residual sediments are deposited in areas that have an impact on human 9
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