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*GCC Rio G7onde August 10,2021 RECEIVED Submitted Via ePermitting and Email AUG 112021 Mr.Patrick Linnberg DIVISION OF RECLAMATION Division of Reclamation Mining and Safety MINING AND SAFETY 1313 Sherman St., Rm.215 Denver,CO 80203 RE: GCC Rio Grande,Inc.,Pueblo Plant,Reclamation Permit No.M-2002-004,Technical Revision, Addition of Explosive Materials Storage Facility Dear Mr.Linnberg: GCC Rio Grande, Inc., Pueblo Plant(GCC) is submitting this request for a Technical Revision (TR)to the GCC Reclamation Permit M-2002-004 to construct an explosive materials storage facility and related access road, in accordance with Section 1.9 of the of the Mineral Rules and Regulations of the Colorado Mined Land Reclamation Board for Hard Rock,Metal,and Designated Mining Operations.The location of the facility will provide convenient and reliable access to explosive materials to support quarry operations. New Area of Disturbance and Facility Structures The proposed explosive materials storage facility is located northeast of the quarry and entirely within the current Reclamation Permit boundary, as shown in Figure 1 Site View. The proposed area of disturbance for the new facility,represented by the green polygon in Figure 2 Detailed View,will measure approximately 600 x 600 feet or 36,000 square feet(0.83 acres).This area will be graded and prepared with approximately 12 inches of compacted rock.Two explosives storage magazines,an emulsion bin and office trailer will be situated on the facility in the approximate locations shown on Figure 2.The emulsion bin will be situated on an approximate 13'x 13'x 1'deep concrete pad.The explosives magazines and office trailer will be situated directly upon the ground.The facility will be surrounded by an 8-foot chain link fence with access gate for security.Dimensions of the structures are summarized below in Table 1. Table 1—Dimensions of Facility Structures Structure Dimensions Explosives Magazine(SN-AMP-109) 96"L x 84"W x 84"H Explosives Magazine(SN-AMP-110) 90"L x 90"W x 90"H Emulsion Bin 29'H x 13'W(cylinder) Office Trailer 30'L x 10'W(estimated) The access road to the new facility will be located as shown in Figure 2.The proposed area of disturbance is estimated to be 1,000 feet long and 60 feet wide or 60,000 square feet(1.4 acres). The total proposed new area of disturbance for the project is summarized in Table 2.