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MR22-321 2.05 – 45.12 07/29/22 <br />be provided by the compressor. The tank will be monitored by electronic controls and strain gauges. Electricity will <br />be supplied from the 6-Main North substation. An electrical line will run from the tank down an existing electrical <br />borehole to controls underground. <br /> <br />The air compressor component includes construction of a reinforced concrete slab foundation with stem wall and <br />footer extending 4-foot below grade, a 30 x 50 x 12 foot compressor building, installation of existing compressors, <br />installation of an electrical power supply for the compressors, installation of Polo Citrus tanks, and drilling of a <br />nominal 13-inch borehole from the surface to the underground workings from the shaft pad above the 6-North Main <br />entries. Drilling of the borehole was covered by the TR05-48 submittal. The compressor building will house two air <br />compressors, two dryers, two 5,000 gallon Polo Citrus tanks, and electrical and control equipment for the systems <br />within the building. The building will be constructed of steel and rest on a designed steel-reinforced concrete <br />foundation. It will be supplied power from the 6-Main North substation and will be insulated and heated. The Polo <br />Citrus tanks will be enclosed by a containment system capable of holding in excess of 5,000 gallons. <br /> <br />In 2016, TC replaced the compressor units with new units which are larger and have greater capacity, to meet the <br />needs of the ongoing Wolf Creek development and mining operations. The larger units required extension of the <br />existing compressor pad and the enclosure building to the south. In conjunction with these modifications, TC also <br />added a small pad and building extension on the north side of the existing building to enclose the compressor after- <br />coolers to facilitate inspection and maintenance. The south pad and building extension has a footprint of 35 feet x <br />40.75 feet, and the north pad and building extension is “L”-shaped, with a footprint of approximately 244 square feet. <br />Both pad extensions are 8-inch concrete slabs resting on 12-inch diameter by 20-foot concrete piers on 10-foot <br />centers. The building extensions are steel frame with coated corrugated metal siding, and match the existing wall <br />and roof profiles. Pad layout and construction details are illustrated by the design drawings included in Exhibit 49A. <br /> <br />The bulk material component includes construction of a pad, installation of a bulk material hopper, and drilling of a <br />nominal 13-inch borehole from the surface to the underground workings from the shaft pad above the 6-North Main <br />entries. In 2022, a new 13-inch bulk material bore hole was drilled immediately west of the original borehole due to <br />the original borehole becoming worn out and unusable. The boreholes are approximately 1,340 feet deep. Drilling of <br />the boreholes were covered by the TR05-48 and MR22-321 submittals. Details for the concrete pad and bulk storage <br />and transfer facilities will be submitted for review and approval as a Minor Revision, prior to installation. <br /> <br />The water component includes construction of a reinforced concrete pad and footers, installation of a water tank and <br />associated pumping installation, drilling of a nominal 13-inch borehole from the surface to the underground workings <br />from the shaft pad above the 6-North Main entries, and construction of the 6MN Mine Water Storage Reservoir. <br />Drilling of the borehole was covered by the TR05-48 submittal. TCC proposes to construct a steel water tank 85 feet <br />in diameter and 24 feet high designed to hold one million gallons. The tank will rest on a reinforced concrete <br />foundation consisting of a spread-footer, stem wall, and slab floor supported by concrete pilings. Preparation of the <br />tank foundation area will involve grading, compaction, and excavation for the support pilings and spread-footer. <br />Following site preparation, the reinforced concrete pilings and footers will be formed, and poured, followed by the <br />reinforced concrete pad and stem wall. The steel tank will be fabricated in sections which will be placed and anchored <br />on the stem wall. A water-tight liner system will complete the tank installation. A buried 8-inch HDPE line will <br />connect the tank to the water borehole for both filling from and discharge to the mine water system. Pumps (both <br />underground and at the surface) and control sensors and valving will allow for controlled flow in either direction in <br />the supply system. Tank fill sensors and a monitored overflow drain will be installed in the tank to prevent overfilling. <br />The overflow drain line will be installed in the same trench as the water supply and return line and will drain back to <br />the mine-water handling system. A small 8 x 8 foot pumphouse, will be constructed next to the tank on a concrete <br />foundation to house pumps and valves. Power and/or control communications will be laid in conduit above the <br />waterline connecting the tank and the borehole. <br /> <br />The locations for the seven boreholes for project utility components are shown on Maps EX16E-M1 and M2. As <br />shown on Map 23, additional entries will be driven to the south of the 6 North Main entries to connect with the <br />ventilation shaft. These entries will be needed to maximize the efficiency of the ventilation system. The entries will <br />be driven in the same manner as is used in TCC’s development work, i.e. continuous miners and shuttle cars. <br />Following commissioning of the shaft, the shaft pad site and access road will be cleaned-up and surface areas graded <br />and dressed.