Monitoring Well Filter Sand

Mounded bentonite soil mixture well screen well cap riser or stand pipe unslotted soil surface unlined bore hole lined bore hole.

Monitoring well filter sand.

This table shows changes to this controlled document over time. If the well is completed with a screen as opposed to an open hole finish in hard rock then the screen usually is surrounded by a sand pack placed by the driller. January 29 2013 revision history. Other applications can include dewatering well and monitoring wells.

The annular space above the sand pack is then sealed to prevent surface. Previous versions of the document are. Well pack gravel is used for deep bed in ground wells to form a barrier between the screens and the natural deposit of the land which in turn allows for the well to provide very clean water. Well rounded sand or gravel that is placed between the formation and the screen.

The space between the screened section and borehole is backfilled with filter sand typically fraction silica sand. Generally a well functions as a monitor or as a pumping or production well. Selecting the appropriate sand pack can be a challenge. The most recent version is presented in the top row of the table.

Thomas kwader presents some guidelines for making your choice. Installation of a filter pack and screen may not be necessary for wells completed in competent bedrock. It helps to prevent sediment from entering the well. Piezometer 4 2 1 1 2 6 bentonite seal filter pack of sand figure 1.