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APPENDIX A DEFINITION OF TERMS The following terms are defined as used in this report: Abandoned Well -.A well whose use has been perma- nently discontinued or which is in such a state of disrepair that no water can be produced. Because abandonment is a state that also involves intent on the part of the well owner, a definition that prescribes a set of conditions and a time limit for use in applying standards appears in Section 21 of Chapter II, "Standards", of this report. Active Well - An operating water well. Annular Space - The space between two well casings or between the casing and the wall of the drilled hole. Aquifer - A geologic formation, group of formations or part of a formation that is water bearing and which transmits water in sufficient quantity to supply springs and pumping wells. Artesian Well -•A well which obtains its water from a confined aquifer. The water level in an artesian well stands some distance above the top of the aquifer it taps. Where the pressure is sufficient to force the water level above the surface of the ground, the well is termed a flowing artesian. well. Bailer - A long narrow bucket with a valve in the bottom used to remove cuttings or fluids from a well. Bentonite - A highly plastic colloidal- clay composed largely of montmorillonite used as a drilling fluid additive or as a sealant. Caste' - A tubular retaining structure which is installed in Ere well bore to maintain the well opening. Cl - A fine-grained geologic material (grain size less than TMU4 mm in diameter) which has very low permeability. Conductor Casing - A tubular retaining structure installed in the upper portion of a well between the wall of the drilled hole and the inner well casing. Cone of Depression - A depression in the water table or piezT ometric surface of a ground water body that is in the shape of an inverted cone and develops around a well which is being pumped. It defines the area of influence of the pumping well.