A well casing should be equipped with a vent and installed using which of the following methods?

The installation of a well casing using concrete as grout is essential for several reasons. First, concrete provides a solid barrier that helps to prevent contamination of the groundwater supply by sealing the annular space between the well casing and the surrounding soil or rock. This is vital to protect against surface contaminants and to maintain the quality of the water being extracted.

Additionally, using concrete as grout enhances the structural integrity of the well. It ensures that the casing remains stable and securely in place, preventing issues such as collapse, which could result from environmental factors or soil movement. The use of concrete also aids in increasing the lifespan of the well by providing resistance against various environmental conditions, such as erosion or seismic activity.

In summary, the correct answer highlights the importance of using concrete as grout in the installation process, ensuring both protection from contaminants and structural stability for the well system.