Monitoring Well Filter Sand

Thomas kwader presents some guidelines for making your choice.

Monitoring well filter sand.

Design and installation of monitoring wells design and installation of monitoring wells 101 af r1 effective date. Monitoring well design and installation february 2008 governor. Well rounded sand or gravel that is placed between the formation and the screen. 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.

Generally a well functions as a monitor or as a pumping or production well. Piezometer 4 2 1 1 2 6 bentonite seal filter pack of sand figure 1. It helps to prevent sediment from entering the well. Installation of a filter pack and screen may not be necessary for wells completed in competent bedrock.

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. The annular space above the sand pack is then sealed to prevent surface. Wells designed to monitor groundwater to evaluate the changes in the physical chemical and biological properties of water.

January 29 2013 revision history. Previous versions of the document are. Mounded bentonite soil mixture well screen well cap riser or stand pipe unslotted soil surface unlined bore hole lined bore hole. Selecting the appropriate sand pack can be a challenge.