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by the Board upon presentation and approval of qualifications. "Professional geologist" is defined in section 23-41-208(b), C.R.S. as "a person engaged in the practice of geology who is a graduate of an institution of higher education which is accredited by a regional or national accrediting agency, with a minimum of thirty semester(forty-five quarter) hours of undergraduate or graduate work in a field of geology and whose post baccalaureate training has been in the field of geology with a specific record of an additional five years of geological experience to include no more than two years of graduate work." 5.2.5 5.2.4 "Bedrock" means consolidated crystalline or sedimentary rock. 5.2.5 5.2.6 "Board" means the state Board of Examiners of Water Well Construction and Pump Installation Contractors created by section 37-91-103. § 37-91-102(3), C.R.S. 5.2.6 5.2.7 "Borehole" means a cylindrical excavation that is augered, drilled, bored, cored, washed, fractured, driven, dug,jetted, or otherwise constructed to access the subsurface for the purpose of constructing a hole or well under the jurisdiction of these Rules. 5.2.7 5.2.8 "Casing" means the pipe installed to prevent collapse of and provide access to the borehole. The term includes both nonperforated ("solid") pipe, perforated pipe, liner, and screen. 5.2.8 5.2.8.1 "Temporary Surface Casing" is the outermost, temporary string of casing used to hold back zones of shallow, unconsolidated or unstable materials from the borehole to facilitate drilling and placement of other strings of casing. Temporary surface casinq may be PVC or steel and is differentiated from Surface Casing or Production Casing in that it is not considered a permanent part of the well construction, should be removed prior to completing grouting in any required grouted intervals and thus not documented on the well construction report. 5.2.8.2 "Surface Casing" is a string of nonperforated, steel casing typically set to isolate or protect the borehole and other subsequent strings of casing from shallow unconsolidated or unstable materials, though surface casing may extend to significant depths. 5.2.8.3 "Production Casing" is a string of casing that is set through the production zone. The production casing may extend to the ground surface and be the only casing string if no surface casing is used or may be a liner that extends up and into the surface casing but not necessarily to the ground surface. Production casing can be nonperforated, perforated, PVC or steel casing depending on its position within the well and the Aquifer type. 5.2.9 "Centralizer" means a device attached to the outside of casing for the purpose of centering it within a borehole or outer casing.- in a minimum of three equidistant planes (e.g., minimum 1 centralizing arm every 120 degrees around the casing; additional planes of centralization encouraged). 5.2.10 5.2.9 "Cistern" means an enclosed, unpressurized reservoir or tank for storing water as part of a water well supply system. 5.2.10 5.2.11 "Completion of pump installation" means that the production equipment has been installed in a well, all necessary equipment has been connected, the well has been disinfected, the production equipment has been tested, and the well is ready to be placed into service. 5.2.11 5.2.12 "Completion of well construction" means that the well has been cased,developed,tested for yield, cleaned, disinfected, and is ready for the installation of the production equipment. 5.2.12 5.2.13 "Confining layerunit" means a geologic zone that, because formation, group of its impermeabilityformations, or low permeability,part of a formation that separates dor inhibits the flow of groundwater into, out of, or between distinct or administratively-defined aquifers (aquifers identified in permits issued by the State Engineer).because it is impermeable or distinctly less permeable than adjacent hydrogeologic units. Some confining