What is the primary purpose of placing a bentonite seal?

The primary purpose of placing a bentonite seal is to protect water-bearing formations from contamination. Bentonite is a clay material that is highly effective at swelling and forming a impermeable barrier when hydrated. This property makes it useful in preventing contaminants from migrating into the groundwater supply, thereby safeguarding the quality of the water. In applications such as well construction or environmental remediation, the bentonite seal creates a reliable physical barrier that isolates the water-bearing layers from potentially harmful substances present in surrounding soils or surface water.

The emphasis on preserving water quality is critical, especially in areas where groundwater is sourced for drinking or agricultural use. By using bentonite to seal any potential pathways for contamination, it helps maintain the integrity and safety of the groundwater resource.