What materials must well casing conform to according to standards?

The correct choice identifies the materials that well casing must conform to according to established standards. New carbon steel, high-strength low-alloy steel, stainless steel, and plastic are all materials that provide the necessary durability and corrosion resistance required for well casing.

These materials are chosen for their ability to withstand the pressures and conditions found in groundwater and well environments. Carbon steel and high-strength low-alloy steel offer strength and resilience. Stainless steel provides outstanding corrosion resistance, particularly in chemically aggressive environments. Plastic, such as PVC, is lightweight, resistant to corrosion, and can be used in certain situations where metal would not be appropriate.

The selection of these materials ensures the integrity of well construction and helps protect the groundwater from contamination. Options that suggest the use of copper, aluminum, wood, or older materials like wrought iron do not meet the current standards for well casing materials, as they may not provide the necessary structural integrity or durability required in groundwater applications.