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Because of the trend toward decentralization in more than Markets in Developing and 70 countries where the World Transition Economies Bank is active, subnational entitiesstates, regions, provinces, counties, and A Framework for Analysis, Policy m[Jnicipalities, and the local Reform, and Assistance Strategy utility companies owned by themare now responsible for delivering services and Michel Noel investing in infrastructure. And infrastructure investments are growing rapidly to meet increasing urban demand. How should the World Bank Group help?

Abstract. Selected results of an international review of soil cover design and construction practices and performance is presented in this paper. The review, which was carried out in 2003, initially included 177 case studies in 14 countries. This has subsequently been updated to include more than 200 individual case studies. The case studies include soil covers for tailings impoundments, waste rock piles, backfilled pits and heap leach pads. The mining operations included precious metals, uranium, coal and oil sands. This is the first international review to focus on the practical questions related to soil cover construction practices, and specifically how that relates to long-term cover performance. This paper provides some suggestions as to how operators, regulators and practitioners could improve soil cover design and construction practices, as learned from these actual case studies.

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