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from the 6-Main North substation and will be insulated and heated. The Polo Citrus tanks will be enclosed <br />by a containment system capable of holding in excess of 5,000 gallons. <br />The bulk material component includes construction of a pad, installation of a bulk material hopper, and <br />drilling of a nominal 13-inch borehole from the surface to the underground workings from the shaft pad <br />above the 6-North Main entries. Drilling of the borehole was covered by the TROS-48 submittal. Details <br />for the concrete pad and bulk storage and transfer facilities will be submitted for review and approval as a <br />Minor Revision, prior to installation. <br />The water component includes construction of a reinforced concrete pad and footers, installation of a water <br />tank and associated pumping installation, and drilling of a nominal 13-inch borehole from the surface to <br />the underground workings from the shaft pad above the 6-North Main entries. Drilling of the borehole was <br />covered by the TROS-48 submittal. TCC proposes to construct a steel water tank 85 feet in diameter and <br />24 feet high designed to hold one million gallons. The tank will rest on a reinforced concrete foundation <br />consisting of aspread-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- <br />footer. Following site preparation, the reinforced concrete pilings and footers will be formed, and poured, <br />followed by the reinforced concrete pad and stem wall. The steel tank will be fabricated in sections which <br />will be placed and anchored on the stem wall. A water-tight liner system will complete the tank <br />installation. <br />A buried 8-inch HDPE line will connect the tank to the water borehole for both filling from and discharge <br />to the mine water system. Pumps (both underground and at the surface) and control sensors and valuing <br />will allow for controlled flow in either direction in the supply system. Tank fill sensors and a monitored <br />overflow drain will be installed in the tank to prevent overfilling. The overflow drain line will be installed <br />in the same trench as the water supply and return line and will drain back to the mine-water handling <br />system. A small 8 x 8 foot pumphouse, will be constructed next to the tank on a concrete foundation to <br />house pumps and valves. Power and/or control communications lines will be laid in conduit above the <br />waterline, connecting the tank and the borehole. <br />The locations for the seven boreholes for project utility components are shown on Maps EX16E-MI and <br />M2. As shown on Map 23, additional entries will be driven to the south of the 6 North Main entries to <br />connect with the ventilation shaft. These entries will be needed to maximize the efficiency of the <br />ventilation system. The entries will be driven in the same manner as is used in TCC's development work, <br />i.e. continuous miners and shuttle cars. Following commissioning of the shaft, the shaft pad site and access <br />road will be cleaned-up and surface areas graded and dressed. <br />in addition to the direct piped connection to the mine-water system at 6MN, the Million-Gallon Tank will <br />be temporarily connected directly to a pipeline running from the 10-Right Mine Dewatering Pipeline. <br />Water from the 10-Right Mine Dewatering Well, which pumps accumulated mine inflows from a sump in the sealed <br />Eastern Mining District, is pumped to the surface by a 320 HP high-capacity submersible pump, at a rate of <br />approximately 700 gpm. The pump discharge is currently transferred by a series of surface and underground <br />pipelines to the Area 1 Pit in the TCC Mine Facilities Area for use in either coal preparation operations or for storage <br />and subsequent use as a back-up source for the operational mine water system. <br />As part of the 6MN Facilities project, TCC will establish a new pipeline running approximately 7,750 feet from the <br />10-Right Dewatering pipeline to the 6MN Storage Reservoir. The pipeline will be constructed of 10-inch HDPE <br />pipe, buried to a depth of approximately six feet, with one sub-grade crossing (bored under) of Fish Creek. Details <br />on the Fish Creek pipeline crossing are presented in Exhibit 490, 6MN Mine Water Storage Reservoir -Design <br />Drawings. Pipeline construction will involve placement of sediment control materials (straw wattles or silt fence) <br />downslope of the disturbance at any location where the pipeline corridor is within SO feet of a drainage or stream <br />.buffer zone; removal and windrowing of available soil material (total soil material volume for the pipeline <br />MR07-224 2.05 - 45.6f 10/17/07 <br />