Which practice increases the chance of groundwater contamination?

Which practice increases the chance of groundwater contamination?

• A. An air gap is used when filling a spray tank
• B. Pesticides are mixed near wells
• C. Rinsates are used in the next tank mix
• D. A portable mixing and loading pad is used

Answer: (B)

Mixing near a well creates a direct route for pesticides to reach groundwater. If spills, drips, or leaks occur during mixing, the pesticide can seep into the soil around the well and move downward with percolating water, especially where soils are permeable or groundwater is shallow. This is why keeping mixing activities away from wells, using an air gap to prevent backflow, and using a portable mixing/loading pad to contain spills are important risk-reducing practices. In contrast, reusing rinse water in the next tank mix can concentrate residues and bring contaminants back into the spray system, increasing the potential for groundwater exposure. So, mixing near wells is the practice that increases the chance of groundwater contamination.

Mixing near a well creates a direct route for pesticides to reach groundwater. If spills, drips, or leaks occur during mixing, the pesticide can seep into the soil around the well and move downward with percolating water, especially where soils are permeable or groundwater is shallow. This is why keeping mixing activities away from wells, using an air gap to prevent backflow, and using a portable mixing/loading pad to contain spills are important risk-reducing practices. In contrast, reusing rinse water in the next tank mix can concentrate residues and bring contaminants back into the spray system, increasing the potential for groundwater exposure. So, mixing near wells is the practice that increases the chance of groundwater contamination.