Monitoring Well Filter Sand

The annular space above the sand pack is then sealed to prevent surface.

Monitoring well filter sand.

The space between the screened section and borehole is backfilled with filter sand typically fraction silica sand. Design and installation of monitoring wells design and installation of monitoring wells 101 af r1 effective date. Mounded bentonite soil mixture well screen well cap riser or stand pipe unslotted soil surface unlined bore hole lined bore hole. Monitoring well design and installation february 2008 governor.

Other applications can include dewatering well and monitoring wells. It helps to prevent sediment from entering the well. 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.

Selecting the appropriate sand pack can be a challenge. January 29 2013 revision history. Well rounded sand or gravel that is placed between the formation and the screen. Piezometer 4 2 1 1 2 6 bentonite seal filter pack of sand figure 1.

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. The most recent version is presented in the top row of the table. Previous versions of the document are.