a) exploratory drilling of well locations (inliner drilling),

b) drilling control level (dry drilling at the choice of the contractor),

c) expansion of exploration wells and level (PVC, DN 150 + 125),

d) Clear pumps, step pump test and flow meter test on the expanded exploration wells.

For the two groundwater holdings Breisach-Jägerhof (7 wells + 2 control levels) and Vogtsburg-Burkheim (11 wells + 2 control levels), exploratory drilling and drilling must be carried out.

The total of 4 levels are to be drilled as dry wells and to be expanded as above ground level in PVC DN 125.

PVC inliner drilling (special sample in the liner DN200) is to be carried out at the well locations as an exploratory drilling. The aim is to obtain soil samples from extraction category "A" (DIN EN ISO 22475-1) from which laboratory samples of quality class 2 according to DIN EN 1997 are taken by the IBB Kerry Paul (Berlin) office. These laboratory samples form the basis for the planning of the wells .

The exploration wells are to be widened and expanded to DN 150 groundwater measuring points (underfloor). This GWM is located in the immediate vicinity of the well and is to be used as a control level.

In the course of this order, all levels must be pumped clear. Pump tests (step pump tests) and flow meter measurements are to be carried out on the DN150-GWM.