One of twelve water treatment technology units, this student manual on wells provides instructional materials for five competencies. (The twelve units are designed for a continuing education training course for public water supply operators.) The competencies focus on the following areas: dug, driven, and chilled wells, aquifer types, deep well construction details, yield and drawdown tests, and well screens. for each competency, student objectives, resources (information sheets and appendix materials), learning activities, and evaluation activity are provided. The appendices contain information on ground water supplies and wells. Generally, an evaluation form with answer key is provided for each competency. (JH)