Which statement distinguishes a monitoring well from an observation well?

• A. A monitoring well is intended for sampling groundwater quality and hydraulic data, while an observation well primarily measures groundwater levels or head.
• B. A monitoring well only measures water levels; an observation well collects water samples.
• C. They are interchangeable terms for the same type of well.
• D. An observation well is used for hydraulic data only.

Answer: (A)