The hollow-stem auger system is commonly used for monitoring well installations to accomplish what purpose?

• A. Install monitoring wells
• B. Purify groundwater
• C. Measure pH
• D. Pump groundwater

Answer: (A)

The main idea is that a hollow-stem auger is used to place a monitoring well in the ground. Its hollow center lets you advance the well casing and screen as you drill, so the well can be installed and left in place with minimal disturbance to the surrounding material. This makes it a practical method for quickly and economically installing shallow monitoring wells in unconsolidated formations.

Purifying groundwater, measuring pH, or pumping groundwater are separate tasks that require different equipment or processes. Purification involves treatment systems, measuring pH uses sensors or test kits, and pumping requires a pump and discharge setup. None of these are accomplished by the drilling and casing-placement function of a hollow-stem auger.