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Geothermal Rules <br />Effective Date: September 30, 2004 <br />4.2 Specific Definitions - Unless expressly stated otherwise, the following terms <br />shall have the meaning indicated in this Rule. <br />4.2.1 "Aquifer" means a hydrogeologic unit consisting of an interval, or <br />hydraulically connected intervals, of consolidated and/or unconsolidated rock material that <br />is capable of storing and transmitting water. It includes both the saturated and <br />unsaturated zone but does not include the confining layer that separates aquifers. <br />4.2.2 "Borehole" means any excavation that is augered, drilled, bored, cored, <br />washed, fractured, driven, dug, jetted, or otherwise constructed to access the subsurface <br />for the purpose of constructing a hole or well under the jurisdiction of these Rules. <br />4.2.3 "Casing" means the pipe installed to prevent collapse of and provide <br />access to the borehole. The term includes both nonperforated ("solid") pipe, perforated <br />pipe, and screen. <br />4.2.4 "Certified Individual" means an individual who is certified by the State <br />Engineer to perform/supervise the drilling or grouting in the construction of loop fields in <br />vertical closed -loop geoexchange systems, or to perform/supervise the excavation and <br />backfilling of loop fields in horizontal closed -loop geoexchange systems or submerge <br />loop fields in a body of water. <br />4.2.5 "Completed Loop Field" means that closed -loop piping has been <br />installed in a borehole, trench or other excavation, or submerged in a body of water; <br />grout has been placed as required by these Rules; and the integrity of the loop field has <br />been tested as required in Rule 8.6. <br />4.2.6 "Completed Well" means a well that has been drilled to its total depth, <br />has been cased, grouted, and pressure or flow tested as required, has been equipped <br />with production equipment if needed, and is ready to be placed into service. <br />4.2.7 "Confining Layer" means a geologic zone that, because of its <br />impermeability or low permeability, inhibits the flow of ground water to or from an adjacent <br />aquifer. <br />4.2.8 "Contaminant" means any chemical or organic material, live organisms, <br />radioactive material or heated or cooled water that will adversely affect the quality of <br />surface or ground water. <br />4.2.9 "Contamination" means the introduction of contaminants into surface or <br />ground water. <br />3 <br />