Photo of a fracking rig
Hydraulic Fracturing sites can spare several acres as exploritory drilling is undertaken in attempt to find deep gas seams that can be mined. This process is considered less disruptive as large earthworks operations aren't always required. It is then possible to dismantle and move the temporary exploring rig to reduce asthetic impact on the landscape here. As can be seen in this photo, there is still debate over how harmful the process can be to the landscape.
Once a seam has been found a permanent rig can be constructed to extract the gas and either pipe or truck the gas for consumption. The rigs are constructed using several layers of concrete as they mine into the earth to prevent toxins from the gas and other surrounding ground from seeping into water tables and potentially contaminating the water supply. While this process does create several safeguards, it is not 100% perfect.