Construction of a groundwater monitoring well for investigating a deeper aquifer

Construction of a groundwater monitoring well for investigating a deeper aquifer: preparatory work, safety measures, documentation of initial and final state; removal of obstructive vegetation (mowing, tree felling or pruning); preparation, securing, and maintenance of areas for the drilling site and construction facilities (approx. 500 m²); establishment of mobile drinking water and power supply; implementation of occupational safety measures, black-and-white facility; drilling work and construction of a groundwater monitoring well in the deeper aquifer with an assumed final drilling depth of maximum 80 m, including approx. 13 m drilling in unconsolidated rock (minimum diameter 300 mm) and maximum 67 m drilling in solid rock as core drilling (≥ 100 mm diameter); widening of the core drilling to a final diameter of ≥ 300 mm; delivery of core boxes and laying out of drill cores; establishment and operation of a core storage; borehole geophysical measurements to determine water ingress in solid rock; completion as a groundwater monitoring well with PVC-U DN 125 pipe material, determination of filter screen slot width based on drilling results, including centralizers; backfilling of the annulus with filter sand/gravel and sealing with magnetically marked clay pellets or cement-bentonite suspension; desanding/clear pumping as a short-term pumping test (maximum 2 hours); borehole geophysical measurements for completion control; construction of a wellhead completion above ground; provision of containers, collection and disposal of all arising media (drill cuttings/slurry, drill cores, drilling fluid, clear pump water); surveying of the new monitoring well in the state system; handover of documentation for well construction; disposal or shredding and distribution of green waste; clearing of the construction site, dismantling of the construction facility area.

Tender documents

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