Which of the following is a key consideration when installing temporary monitoring wells?

• A. Well integrity
• B. Purge and decontamination
• C. Screen placement
• D. All of the above

Answer: (D)

When installing temporary monitoring wells, several interrelated factors shape data quality and safety. You need good well integrity so the borehole and casing stay stable, seals prevent leaks, and cross-contamination from surrounding materials is minimized. Proper purge and decontamination ensure any drilling fluids or residues are removed so the samples reflect true groundwater conditions rather than artifacts from installation. Screen placement matters because the screen interval should intersect the target aquifer zone and avoid bias from overlying or underlying layers or low-permeability pockets. Understanding how these aspects work together—stability, cleanliness, and correct targeting—helps ensure the monitoring results are accurate and reliable. Skipping any one aspect can compromise data quality or safety, which is why all of the above is the right approach.