Abstract
Abstract Procedures of site investigation included in BS 5930:1981 concentrate on obtaining information on ground conditions near proposed structures. Groundwater flow paths, however, are often influenced by hydrogeological conditions well beyond the area and tracer tests have been found a useful addition to investigations. Different types of groundwater tracers are described and their uses in establishing groundwater flow paths and other hydrogeological characteristics of some regimes are outlined. Precautions are always necessary when using tracers, however, and these are especially stringent with radioactive tracers. The paper shows how groundwater tracers were employed in investigations of landslips, waste disposal studies and other investigations with which the authors have been involved. The paper concludes that the specification of standard procedures for tracer tests is probably not appropriate but reference to the techniques available would be useful in promoting their application.
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