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The development of an attributed 3D model of the Quaternary deposits across 75 km that modelling of this type should be used by site developers and remediators to design more targeted and cost-effective site investigations and risk assessments.

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BACKGROUND Over the past few years, the creation of systematic three dimensional (3D) geological subsurface models has become standard practice of national Geological Surveys. The methods for construction of 3D models are well documented (e.g. Hinze et al., 1999; Sobisch, 2000; Kessler et al., 2004) and software tools like GSI3D (Geological Surveying and Investigation in 3 Dimensions; ©INSIGHT Geologische Softwaresysteme GmbH) use section-building techniques that are familiar to all geologists.