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Secondary Substation 12, located about a half mile north of Substation 11 on the 6MN Road, converts incoming <br />power from 69KV to 4,160V and distributes it to the associated NW Mains Ventilation Fan installation. Substation <br />12 is approximately 50 x 30 feet, and consists of a fenced transformer pad, transformer, associated electrical <br />equipment, and connecting power distribution lines. <br />Secondary Substation 13, located about a half mile north of Substation 12 in the 6MN facilities area, converts <br />incoming power from 69KV to 4,160V and distributes it to the 6MN air compressor. Two transformers convert the <br />69KV power to 12,470V and transfer power underground by shielded cable through two separate power -drop <br />boreholes. Another transformer converts the 4,160V power to 480V and distributes it to the 6MN Emergency <br />Escape Hoist by overhead powerline. Substation 13 is approximately 120 x 100 feet, and consists of four <br />transformers within a fenced enclosure, associated electrical equipment, and connecting power distribution lines. <br />YVEA also has a primary substation (Sandstones Substation), located adjacent to Routt County Road 27, that <br />supplies 69KV power to the new Washplant II(addressed under the discussion of the Washplant II facilities) and the <br />adjacent TCC primary Substation 4. Substation 4 in turn converts the 69KV to 4,160V and feeds it to TCC's Coal <br />Handling Systems secondary Substation 5, Washplant I, the Batch -Weigh Loadout, and the Pond A and Area 1 Pit <br />pumping installations. Substation 4 is approximately 30 x 20 feet, and consists of a fenced transformer pad, <br />transformers, associated electrical equipment, and connecting power distribution lines. The powerline from <br />Substation 4 to Washplant I is an overhead line (5 poles) to Haulroad B, and is then buried from the north edge of <br />the road into the plant. Distribution lines with poles on 300 -800 foot centers supply power to the pump stations <br />located at Pond A and the Area 1 Pit. Substation 5, located dust east of the Batch -Weigh Coal Stockpile, converts <br />incoming power from 4,160V to 480V for distribution to the Coal Handling System. Substation 5 is approximately <br />50 x 30 feet, and consists of a fenced transformer pad, transformers, associated electrical equipment, and <br />connecting power distribution lines. <br />Another YVEA substation (Substation 10 - Lieske Substation), located just northeast of the intersection of Routt <br />County Roads 33 and 179, supplies 12,470V power to TCC's Eastern Mining District (EMD) Ventilation Fan <br />Installation. A distribution line (28 poles) from a switch box at the Mine 3 (Middle Creek) Warehouse runs west <br />approximately 8,200 feet. This substation and powerline are shown on Figure 16C. <br />Primary Substation 14, located at the 18 -Left Ventilation Shaft site, is connected to a separate 69KV powerline and <br />converts incoming power from 69KV to 4,160V and 440V, and distributes it to the 18LT Mine Ventilation Fan, <br />shaft heater and emergency escape hoist. Substation 14 is approximately 80 x 125 feet, and consists of several <br />transformers within a fenced enclosure, associated electrical equipment, grounding field, and connecting power <br />distribution lines. <br />Powerpole installation involves the use of existing roads or limited overland access to the individual pole locations, <br />localized shallow auger drilling to set each pole, pole placement and anchoring, and distribution of the limited drill <br />cuttings over the small area surrounding each pole. Given the very limited temporary disturbance involved, TCC <br />does not propose topsoil recovery or reseeding for the individual powerpole locations. It should be noted that pole <br />locations have been selected specifically to avoid stream buffer zones or other sensitive areas. Constriction of the <br />distribution lines w involves the use of existing roads or limited overland access by a bucket truck and cable truck <br />to install cross -bars, insulators and conductors. All cross -bars will have installed raptor deterrents, consistent with <br />approved raptor protection guidelines. Powerline installation will not affect existing drainage systems, given the <br />minimal surface disturbance and very temporary nature of the activities involved. <br />A typical grounding configuration for the identified substations is a grid of conductive cables (typically welded in <br />10 foot x 10 foot squares under the whole pad and extending 10 feet from the perimeter of the substation fence and <br />buried to a depth of 18 to 24 inches. Supplemental grounding for pole - mounted transformer or primary distribution <br />powerlines is provided by two or more 50 -foot wires, burred to a depth of 5 feet, extending, to the sides of the <br />poles. The associated disturbance for the grounding fields is minimal and requires no additional sediment control. <br />Locations of the substations, transformers, and power distribution lines are shown on Maps 39 (Substation and <br />Powerline Locations) and 24 (Surface Facilities). There are also a number of minor electrical installations, briefly <br />described as follows: <br />MR11 -258 2.05 -46.1 10/25/11 <br />