The New Locks DEK-Nord project in North Rhine-Westphalia envisages the replacement of the old Rodde and Bevergern major locks on the northern section of the Dortmund Ems Canal (DEK) with new locks. At the same time, the ports and the shore areas are being redesigned and the Dörenthe deposition area used. The construction work for the production of the new locks mainly involves wet soil excavation, which is to be reinstalled as far as possible when securing the old lock structures, filling in old water areas and designing the terrain. Here, unloaded and slightly anthropogenic excavated material (up to and including installation class Z1.2) is discarded or temporarily stored in the area of the locks on land or filled in the area of old atries/journeys.

Due to the existing legal requirements (general protection of groundwater and protection of neighboring properties from adverse effects by groundwater), extensive chemical groundwater evidence is necessary in the areas of backfilling at lock sites and soil management/soil deposition areas. These areas are to be monitored via hydrochemical groundwater evidence, for which selected groundwater measurement points (GWM) are to be sampled every six months.

The responsible client (AG) for the preservation of groundwater evidence within the scope of the investigation described here is the Waterways New Construction Office Datteln (WNA Datteln).

Groundwater sampling and analysis twice a year at three sites with test reporting