Which of the following are examples of groundwater systems?

The correct answer is demonstrated through the understanding of groundwater systems, which primarily involve the methods and structures that access water from subterranean sources. Dug, bored, driven, and drilled wells are all engineered to extract groundwater, tapping into aquifers or underground water-bearing formations. Springs, whether they emerge from rock formations or sand and earth, also signify naturally occurring groundwater systems, where water flows to the surface without the need for mechanical extraction. Infiltration galleries are another method of accessing groundwater, utilizing a network of trenches filled with gravel or similar materials to collect and direct water.

Groundwater systems fundamentally differ from surface water systems, which include lakes, rivers, and ponds, all of which are not classified as groundwater. The mention of water located no deeper than 400 feet is not essential to defining groundwater systems, as groundwater can exist at varying depths and is not limited to a specific superficial measurement. Direct municipal wastewater systems involve the management and treatment of surface water and sewage, thus irrelevant to the definition of groundwater systems.