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between the production casing and the borehole wall from a depth of at least thirty-nine (39) feet up to the depth required by Rule 10.5.2.1. See Figure 4d. b. If surface casing is installed to a depth less than thirty-nine (39) feet below the land surface and grouted to the depth required by Rule 10.5.2.1, the annulus between the borehole wall and the production casing string must be grouted from a depth of at least thirty nine (39) feet below the surface back to a level that is at least ten (10) feet above the base of the surface casing. See Figure 4d. c. If surface casing is installed to at least thirty-nine (39) feet below the surface and penetrates into the Type 2 Aquifer, the annulus between the surface casing and the production casing string need not be grouted if the annular space between the borehole wall and the surface casing is grouted from a depth of at least thirty-nine (39) feet up to the depth required by Rule 10.5.2.1. d. If surface casing is installed to at least thirty-nine (39) feet below the surface and does not penetrate into the Type 2 Aquifer, the annulus between the surface casing and the production casing string must be grouted grouted from a depth of at least thirty nine (39) feet below the surface back to a level that is at least ten (10) feet above the base of the surface casing. e. If the grouted minimum grouted intervals described in Rule 10.4.6.3 do not extend to a depth at least ten (10) feet below the base of the Type 3 Aquifer, grout must also be placed in the annular space between the production casing and the borehole wall, and/or between the surface casing and the borehole wall from a depth ten (10) feet below the base of the Type 3 aquifer up to a level that is not less than fifty (50) feet above the base of the Type 3 aquifer or to the depths required by Rule 10.5.2.1. See Figure 4d. f. If the surface casing is driven, grout must be placed to meet the requirements of Rule 10.4.2.1 (see Figure 3) and the additional requirements presented in Rule 10.4.6.3 necessary to isolate the Type 3 aquifer from the Type 2 Aquifer. 10.4.7 Wells Constructed Into Type 111-Actuiter3 Aquifers (Unconsolidated Material)—and the Unconfined San Luis Valley Aquifer- Wells constructed into a Type 1-443 aquifer(unconsolidated aquifer) or the Unconfined San Luis Valley aquifer must have at least twenty (20) feet of solid steel casing in accordance with Rule 10.4.2 or Rule 10.4.3, and at least ten (10) feet of continuous grout. 10.4.7.1 Casing Requirements -All wells completed in a Type 143 Aquifer (unconsolidated aquifer--see Rule 5.2.2.3), with or without surface casing must have solid steel casing with watertight joints installed from a depth of at least nineteen (19) feet to the top of the well. 10.4.7.2 Grouting Requirements - a. In wells constructed with surface casing into Type 11-43 aquifers {unconsolidated aquifer), the annulus between the borehole wall and the surface casing must be grouted from a depth of at least nineteen (19) feet up to the depth required by Rule 10.5.2.1. If the surface casing is driven, grout must be placed bet3Neento meet the production casing and driven casing from not less than ten (10) feet below to at l a.,t ten (10) feet above the baserequirements of the driven casingRule 10.4.2.1 (see Figure 3). At least ten (10) feet of continuous grout is required. b. If surface casing is not installed, the annulus between the borehole wall and the production casing string must be grouted from a depth of at least nineteen (19) feet up to the depth required by Rule 10.5.2.1. (see Figure 4e). At least ten (10) feet of continuous grout is required.