Monitoring Well Filter Sand

Installation of a filter pack and screen may not be necessary for wells completed in competent bedrock.

Monitoring well filter sand. 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. The space between the screened section and borehole is backfilled with filter sand typically fraction silica sand. Selecting the appropriate sand pack can be a challenge.

Monitoring well design and installation february 2008 governor. This table shows changes to this controlled document over time. Mounded bentonite soil mixture well screen well cap riser or stand pipe unslotted soil surface unlined bore hole lined bore hole. Previous versions of the document are.

The annular space above the sand pack is then sealed to prevent surface. The most recent version is presented in the top row of the table. Piezometer 4 2 1 1 2 6 bentonite seal filter pack of sand figure 1. Thomas kwader presents some guidelines for making your choice.

Other applications can include dewatering well and monitoring wells. Generally a well functions as a monitor or as a pumping or production well. 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.