What is the required separation distance if a well is downhill from the testing site?

The required separation distance of 100 feet for a well located downhill from a testing site is based on the principles of groundwater protection and the prevention of contamination. When a well is positioned downhill from a potential contaminant source, any contaminants that may leach or run off from the testing site have a higher risk of reaching the water supply.

The 100-foot separation distance serves as a buffer zone designed to minimize the risk of contaminating the groundwater by providing enough space for natural filtration and reducing the velocity at which pollutants might travel through the soil. This distance can help ensure that any potential contaminants have ample time and distance to degrade or be absorbed before reaching the well.

The standards for separation distances can vary depending on local regulations and specific site characteristics, but a distance of 100 feet is a widely accepted guideline in many jurisdictions to safeguard drinking water from potential contaminants. In contrast, distances that are shorter might not provide adequate protection depending on the type of potential hazards present and the specific hydrological conditions of the area.