Call for tender under the SQS 239894 - Category 4 - Site investigations for HDD crossing at Roskilde Fjord

Description du marché

The scope of work includes performance of site investigations for one HDD location: 1. Roskilde Fjord, HDD range approximately 1700 m. The site investigations include: • Work Package A (Lot 1) - Geophysical investigations with electrical resistivity mapping of the geology to identify shallow soft soil, low and high resistivity units between boreholes and homogeneity and fractureness of pre-quaternary soil units (Danien Chalk). Detailed seismic mapping down to at least 50 m under the seabed. Furthermore, the seabed surface must be mapped with respect to water depth and surface characteristics. • Work Package B (Lot 2) - Geotechnical investigations with conventional geotechnical boreholes, CPT tests and laboratory tests, but also coreing of underlying pre-quaternary soil units of Danien Chalk, including advanced laboratory testing on selected samples (geological description). This package also includes geophysic well-logging. The results must be delivered as site investigation reports supported by profiles, charts as well as digital deliverables for both WP1 and WP2.

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