A discrete groundwater sampling can be achieved with a Geoprobe SP 16 groundwater sampler. This sampling system enables to collect representative groundwater samples from a defined interval.

The groundwater sampler is driven to the desired sampling depth. When probes are placed at desired sampling depth, a stainless steel filter will be exposed by retracting the sheath. In this case the length of the screen and sampling zone respectively is 1 meter. The groundwater that flows through the filter is pumped according to low-flow method procedures. Low-flow methods minimise the volatilization of VOC’s. To prevent cross contamination, virgin tubing is used at each investigation point. The field parameter (ORP, O₂, pH, temperature, electrical conductivity) are measured on site by using a flow-through cell.

Depending on the geological conditions, different types of probes with varying filter lengths are available. The probes are advanced by static force and percussion into the subsurface. Due to the compact design of the drilling unit and the availability of carriage, also sampling in limited areas and inside of buildings is possible, as can be seen in the following pictures.