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above the base of the grouted surface casingType 3 aquifer or to the <br /> depths required by Rule 10.5.2.1. See Figure 4b. <br /> q. If the surface casing is driven, grout must be placed to meet the requirements <br /> of Rule 10.4.2.1 (see Figure 4b. Schematic diagram for wells-that <br /> pPecietpate3) and the additional requirements presented in Rule <br /> 10.4.5.2 necessary to prevent the intermingling of aquifers. <br /> 10.4.5.3 Type 1 Well Penetrating One (1) or More Confining Unit(s) Outside the <br /> Administrative Denver Basin (Excluding Wells Completed in the <br /> Laramie-Fox Hills Aquifer, see Rule 10.4.8 or Wells Completed in the <br /> Confined San Luis Valley Aquifer, see Rule 10.4.9)— <br /> a. Wells completed in a Type 1 aquifer(confined aquifer—see Rule 5.2.3.1), <br /> where the borehole penetrates one (1) or more than one confining <br /> tayerunit(s), and are constructed into a Type I (confined) a„uife without <br /> surface casing must have watertight solid production casing with watertight <br /> joints installed from the base of the confining unit directly above the permitted <br /> aquifer, or production zone, to the top of the well. <br /> b. 10.4.5.3 Wells that are constructed with surface casing that does not <br /> extend at least to the top of the production zone must have solid production <br /> casing with watertight joints installed from the base of the confining unit <br /> directly above the permitted aquifer, or production zone, to at least ten (10) <br /> feet above the base of the surface casing (see Figures 4b). <br /> c. Wells that are constructed with surface casing that extends to the top of the <br /> production zone or deeper must have solid casing with watertight joints <br /> installed from the base of the confining unit directly above the permitted <br /> aquifer or production zone but additional grout in the annulus between the <br /> production and surface 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 (See <br /> Rule 10.4.4.2) from the base of the confining unit overlying the permitted <br /> aquifer or production zone up to ground surface or to the depth required by <br /> Rule 10.5.2.1. Granular bentonite may be used instead of approved or bulk <br /> grout in the portion of the grouted interval required in this Rule, from the base <br /> of the confining unit overlying the permitted aquifer or production zone, and <br /> ending at a point not less than 39 feet below the ground surface. The grout <br /> material must be designed to withstand the maximum potential hydrostatic <br /> pressure encountered in the annulus. <br /> e. If the surface casing is driven, grout must be placed to meet the requirements <br /> of Rule 10.4.2.1 (see Figure 3) and the additional requirements presented in <br /> Rule 10.4.5.3 necessary to prevent the intermingling of aquifers. <br /> Hydraulic fracturing of a water well in Type 11 Aquifers: Any hydraulic fracturing or stimulation of the <br /> producing interval of a water well drilled _into a Type Ti Aquifer must not compromise the <br /> integrity of a confining layer. Before initiating any hydraulic fracturing operations in a water well <br /> drilled into a Type I Aquifer, the driller and/or consultant (Authorized Individual) must provide <br /> detailed plans for such operations to be_reviewed by Board Staff at the State Engineer's Office, <br /> and may only initiate such operations upon (1) advance written approval of the Board, and (2) <br /> at least 24 hours advance notification of the initiation of such operations to the Chief Well <br /> Inspector by telephone or email. Upon request of the Chief Well Inspector or other staff of the <br /> State Engineer, the driller or authorized individual must provide reports or other data concerning <br /> the hydraulic fracturing of the water well. <br />