Primary Substation 12, located about a half mile north of Substation 11 on the 6MN Road converts incoming power
<br />from 69KV to 4,160V and distributes it to the associated NW Mains Ventilation Fan installation. A distribution
<br />line from Substation 12 will run to the 6MN Reservoir Installation, where a transformer will convert the incoming
<br />power from 4,160V to 480V to power the transfer pump and ancillary equipment. Substation 12 is approximately
<br />50 x 30 feet, and consists of a fenced transformer pad, transformer, associated electrical equipment, and connecting
<br />power distribution lines.
<br />Primary 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 11 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 1, 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 just 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, converts incoming power from 69KV to
<br />4,160V and 440V, and distributes it to the 18LT Mine Ventilation Fan, shaft heater and emergency escape hoist.
<br />Substation 14 is approximately 80 x 125 feet, and consists of several transformers within a fenced enclosure,
<br />associated electrical equipment, grounding field, and connecting power distribution lines.
<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, buried 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 />A 100 KVA transformer measuring 2 x 2 x 1.5 feet is located on the east side of the third office trailer to
<br />provide power to the trailer.
<br />A short (600 feet - 3 poles) 240 volt powerline runs northwest from the County road to the Fish Creek
<br />Water Treatment System settling ponds, however, while this line remains in- place, it has been replaced by
<br />the distribution line from Substation 8. A 400 foot extension off this distribution line (3 poles) supplies
<br />power to the Fish Creek Ventilation Shaft Dewatering Borehole.
<br />TR09 -66 2.05 -46.1 02/17/09
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