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10.4.5 Wells Constructed Into Type 11 Aquifers (Confined Aquifers): <br /> 10.4.5.1 Type 11 Well Penetrating Only One (1) Confining LayerUnit <br /> Inside the Administrative Denver Basin (Excluding Those <br /> Pen * .gWells Completed in the_Laramie-Fox Hills Aquifer see <br /> Rule 10.4.8)- <br /> a. Wells completed in a Type t1 aquifer(confined aquifer—see Rule <br /> 5.2.23.1), where the borehole penetrates only one (1) confining <br /> tayerunit (see Rule 5.2.1-213), and are constructed without surface <br /> casing must have watertight solid casing with watertight joints installed <br /> from the base of the confining tayerunit directly above the permitted <br /> production zone to the top of the well. <br /> b. Wells completed in a Type I aquifer (confined aquifer), <br /> where the borehole penetrates only one (1) confining layer, <br /> acidthat are constructed with surface casing must have solid casing with <br /> watertight joints installed from the base of the confining tayerunit <br /> directly above the permitted production zone to at least ten (10) feet <br /> above the base of the surface casing (see Figures 4a and 4b). <br /> c. For wells constructed into Type I aquifers, where the borehole penetrates enty one (1}confining layer, <br /> the <br /> c. The annulus between the borehole wall and the casing string must be <br /> grouted with cementapproved grout or cement-bentonitebulk grout <br /> (Table 2) from the base of the confining tayerunit directly above the <br /> permitted production zone back to a level that is not less than sixty (60) <br /> feet above the base of the confining layerunit or to the level required to <br /> withstand the maximum potential hydrostatic pressure differential <br /> between the aquifers. <br /> d. If the well is constructed with steel production casing, the interval from <br /> the base of the confining layerunit directly above the permitted <br /> production zone to the depth required by Rule 10.5.2.1 must be <br /> grouted with approved grout or bulk grout (Table 2),)to the depth <br /> required by Rule 10.5.2.1. If surface casing is used, the grout must <br /> extend 10 feet above the base of the grouted surface casing. <br /> e. The upper part of the well must be grouted with cementapproved <br /> grout or bulk grout to a minimum depth of thirty-_nine (39) feet as <br /> shown in Figures 4a and 4b, and in accordance with Rule 10.5.2.1. <br /> GreutApproved grout or bulk grout must also be placed between <br /> casing strings when fluctuating static or water table levels could cause <br /> interconnection or intermingling of water from different aquifers unless <br /> such interconnection or intermingling has been specifically permitted <br /> by the State Engineer. <br /> f. The grouted intervals must isolate the Type 3 aquifer from the <br /> underlying consolidated bedrock units. If the grouted intervals required <br /> in Rules 10.4.5.1.c does not extend to or above the base of the Type 3 <br /> aquifer, or if the minimum grouted interval required by Rule 10.4.5.1.e <br /> does not extend at least ten (10) feet below the base of the Type 3 <br /> aquifer, grout must also be placed in the annular space between the <br /> production casing and the borehole wall, and/or between the surface <br /> casing and the borehole wall from a depth ten (10) feet below the base <br /> of the Type 3 aquifer up to a level that is not less than fifty (50) feet <br /> above the base of the Type 3 aquifer or to the depths required by Rule <br />