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10.5.2.1. See Figure 4a. <br /> a-q. If the surface casing is driven, grout must be placed to meet the <br /> requirements of Rule 10.4.2.1 (see Figure 3) and the additional <br /> requirements presented in Rule 10.4.5.1 necessary to prevent the <br /> intermingling of aquifers. <br /> 10.4.5.2 Type 1 Well Penetrating More than One (1) Confining Unit Inside the <br /> Administrative Denver Basin (Excluding Wells Completed in the <br /> Laramie-Fox Hills Aquifer see Rule 10.4.8)— <br /> a. Wells completed in a Type Ti aquifer(confined aquifer—see Rule 5.2.23.1), <br /> where the borehole penetrates more than one (1) confining tayerunit, and are <br /> constructed without surface casing must have watertight solid steel production <br /> casing with watertight joints installed from the base of the confining tayerunit <br /> directly above the permitted production zone to the top of the well. <br /> b. Wells completed in a Type I aquifer (confined aquifer), where the borehole penetrates more than one (1) <br /> confining layer, and <br /> b. Wells that are constructed with surface casing that does not extend at least to <br /> the top of the production zone must have solid steel production casing with <br /> watertight joints installed from the base of the confining tayerunit directly <br /> above the permitted production zone to at least ten (10) feet above the base <br /> of the surface casing (see Figures/la and 4b). <br /> c. Wells that are constructed into Type I aquifers (confined aquifers), <br /> wherewith surface casing that extends to the borehole penetrates <br /> more than one (1) confining layer, thetop of the production zone or <br /> deeper must have solid casing with watertight joints installed from the <br /> base of the confining unit directly above the permitted production zone <br /> but additional grout in the annulus between the production and surface <br /> casing is not required. <br /> d. The annular space between the borehole wall and the casing string must be <br /> grouted with approved grout or bulk grout using positive displacement from <br /> the base of the confining tayerunit directly overlying the permitted production <br /> zone up to sixty (60) feet above the base of the uppermost confining <br /> tayerunit, or to the depth required by Rule 10.5.2.1. <br /> e. *the well ■s onstructed with steel casing the interval from the base <br /> of the confining layer directly above the production zone to the <br /> depth required by Rule 10.5.2.1 must be grouted with approved grout <br /> {Table 2). If surface casing is used, the or bulk grout to a minimum <br /> depth of thirty nine (39) feet as shown in Figures 4b, and in <br /> accordance with Rule 10.5.2.1. Approved grout or bulk grout must <br /> cxtcnd 10also be placed between casing strings when fluctuating static <br /> or water table levels could cause interconnection or intermingling of <br /> water from different aquifers unless such interconnection or <br /> intermingling has been specifically permitted by the State Engineer. <br /> f. The grouted intervals must isolate any unconsolidated materials (Type 3 <br /> aquifer) from the underlying consolidated bedrock units. If the grouted <br /> intervals required in Rule 10.4.5.2.d does not extend to or above the base of <br /> the Type 3 aquifer, or if the minimum grouted interval required by Rule <br /> 10.4.5.2.e does not extend at least ten (10) feet below the base of the Type 3 <br /> aquifer, approved or bulk grout must also be placed in the annular space <br /> between the production casing and the borehole wall, and/or between the <br /> surface casing and the borehole wall from a depth ten (10) feet below the <br /> base of the Type 3 aquifer up to a level that is not less than fifty (50) feet <br />