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casing. <br /> d. Centralization of the casing at the ground surface may be accomplished with <br /> appurtenances of the drilling equipment or other mechanical means. <br /> e. Centralizers must be installed in all grouted intervals of the surface casing and <br /> production casing of a well. The distance between centralizers must not exceed fifty <br /> (50) feet for intervals that will be grouted for more than fifty (50) feet. <br /> f. If the grouted interval of the won casing is less than fifty (50) feet, centralizers <br /> must be installed atwithin 5 feet of the top and bottom of the grouted interval. <br /> q. Production casing must be hung in tension during the placement of grout <br /> material. <br /> 10.4.2 Wells with Surface Casing -Wells that will be constructed with a surface casing <br /> string must have watertight steel casing and joints installed from a minimum of one (1) <br /> foot above to a minimum of nineteen (19) feet below ground level. The annular space <br /> between the borehole wall and surface casing string must, at a minimum, be grouted in <br /> accordance with the requirements of Rule 10.5. Centralizers must also be installed <br /> on grouted surface casing within five (5) feet of the bottom of the surface <br /> casing. <br /> 10.4.2.1 Driven Surface Casing for wells in Type 41 nd Type Ill guife.-&- <br /> The annular space between surface casing that is driven and the production <br /> casing string must be grouted in accordance with the following requirements for <br /> Type 142 and Type 1-443 aquifers. Additional grouting below the base of the driven <br /> surface casing may be necessary to comply with the requirements for a <br /> particular type of aquifer.Type 1 or Confined San Luis Valley aquifers. See <br /> Figure 3. <br /> a. For Type 1, 2, and Confined San Luis Valley aquifers (unconfined <br /> bedrock aquifers) with driven surface casing, the grout interval must <br /> extend from at least twenty (20) feet below to at least ten (10) feet <br /> above the base of the surface casing. <br /> b. For Type 41-43 aquifers (unconsolidated aquifers)with driven surface <br /> casing, the grout interval must extend from at least ten (10) feet below to <br /> at least ten (10) feet above the base of the surface casing. See Figure 3. <br /> 10.4.3 Wells without Surface Casing -All wells that will be constructed without surface casing <br /> must have watertight steel casing and joints installed from a minimum of one (1) foot <br /> above to a minimum of nineteen (19) feet below ground level. The annular space <br /> between the borehole wall and production casing string must be grouted in accordance <br /> with grouting requirements for the particular type of aquifer in which the well is <br /> constructed and the requirements of Rule 10.5.2.1. <br />