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Geothermal Rules <br />Effective Date: September 30, 2004 <br />4.2.19 "Mechanical Integrity Test" means a procedure to determine if the <br />casing, tubing, or packers leak or if fluid movement occurs in or adjacent to the well <br />other than in the reservoir. <br />4.2.20 "Open System" means a system that generally consists of a production <br />well (Type A -OS) to withdraw a geothermal fluid, and a reinjection well for returning the <br />fluid to the aquifer. <br />4.2.21 "Operator" means the person maintaining or operating a geothermal <br />well, whether or not such person is the owner of the well, and where such person has <br />been designated in writing by the well owner to act on his behalf. <br />4.2.22 "Plugged Well" means a well that has been plugged to prevent entry of <br />fluids into the well and to isolate subsurface fluids to the formations in which they are <br />encountered in the well. <br />4.2.23 "Production Equipment" means any pump, fluid circulating system, or <br />other device used or intended for extracting geothermal resources from a well. <br />Production equipment includes well seals, well heads, control devices, and couplings <br />appurtenant thereto. <br />4.2.24 "Reinjection" means reintroducing geothermal fluids through a well into <br />the same reservoir from which they were produced, whether by pressure at the surface <br />or by gravity flow. <br />4.2.25 "Replacement Geothermal Well" means a new well constructed to <br />replace an existing geothermal well, or any portion thereof. The repair of an existing <br />geothermal well is excluded from this definition, where such repair does not relocate or <br />expand the structure. <br />4.2.26 "Reservoir" means a subsurface geologic unit or aquifer that contains a <br />common geothermal source. Each reservoir in a field, which is hydrologically separated <br />from any other reservoir, is covered by the term "reservoir" in these Rules. <br />4.2.27 "Special Field Rules" shall mean those rules promulgated for and <br />which are limited in their application to geothermal management districts. <br />4.2.28 "Type A Geothermal Well" means any geothermal well that has a total <br />depth not exceeding two thousand five hundred (2,500) feet or that encounters <br />geothermal fluids having a temperature not exceeding two hundred and twelve (212) <br />degrees Fahrenheit. <br />4.2.28.1 "Type A -OS Well" means the production well component <br />of an open system to withdraw a geothermal fluid that is utilized for its geothermal <br />properties. <br />5 <br />