What is the required characteristic of grout used in sealing wells?

The required characteristic of grout used in sealing wells is its ability to produce a waterproof seal. This property is crucial because the primary purpose of sealing a well is to prevent the contamination of groundwater and to keep surface water from entering the well. A waterproof seal ensures that no fluids can migrate through the grout material, safeguarding the integrity of the groundwater source.

In well construction and maintenance, it’s vital to create a barrier that isolates the well from potential contaminants that could seep in from the surrounding environment. The effectiveness of the seal can directly impact the water quality, making the waterproof nature of the grout the key characteristic for this application. This focus on water resistance underlines its necessity in both protecting the water supply and ensuring compliance with environmental regulations.