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Monitoring well filter sand. Previous versions of the document are. Other applications can include dewatering well and monitoring wells. Design and installation of monitoring wells design and installation of monitoring wells 101 af r1 effective date. Thomas kwader presents some guidelines for making your choice.
January 29 2013 revision history. Well rounded sand or gravel that is placed between the formation and the screen. Selecting the appropriate sand pack can be a challenge. It helps to prevent sediment from entering the well.
Mounded bentonite soil mixture well screen well cap riser or stand pipe unslotted soil surface unlined bore hole lined bore hole. The space between the screened section and borehole is backfilled with filter sand typically fraction silica 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.
The most recent version is presented in the top row of the table. Wells designed to monitor groundwater to evaluate the changes in the physical chemical and biological properties of water. Piezometer 4 2 1 1 2 6 bentonite seal filter pack of sand figure 1. Installation of a filter pack and screen may not be necessary for wells completed in competent bedrock.
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