Monitoring Well Filter Sand

Piezometer 4 2 1 1 2 6 bentonite seal filter pack of sand figure 1.

Monitoring well filter sand.

Monitoring well design and installation february 2008 governor. Installation of a filter pack and screen may not be necessary for wells completed in competent bedrock. Generally a well functions as a monitor or as a pumping or production well. This table shows changes to this controlled document over time.

The annular space above the sand pack is then sealed to prevent surface. 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. Well rounded sand or gravel that is placed between the formation and the screen. 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. Selecting the appropriate sand pack can be a challenge. The most recent version is presented in the top row of the table. Design and installation of monitoring wells design and installation of monitoring wells 101 af r1 effective date.

January 29 2013 revision history. 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. It helps to prevent sediment from entering the well. Other applications can include dewatering well and monitoring wells.