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• IV.E Electrical Distribution System <br />Existing powerlines are shown on Map 22. <br />The 13.8-kV powedine servicing the mine site approximately parallels the existing county road which <br />provides access to the plant area. Construction access was from the existing county road. Some <br />minor tree and brush clearing was required. Any areas disturbed during powedine construction <br />were immediately reclaimed. <br />The 13.8-kV powerline structures are single wood poles approximately 30 feet high and spaced <br />about 350 feet apart. Excavation for the holes was by an auger. All excavated material not used for <br />backfilling was spread and seeded along with other areas disturbed during construction of the power <br />line. <br />The 13.8-kV line was not routed near the 138-kV line due to economic considerations. The route for <br />this power line crosses mine areas that have been and will be subsided. The route for the 138-kV <br />line is much longer. It was originally constructed in anon-subsidence corridor, however, due to <br />changes in the mine plan, it is also in areas that may be affected by mine subsidence. Raptor proof <br />poles are used. <br />• Permanent electrical power for operating the mine and plant is supplied from an existing 138-kV line <br />located southeast of the "D" Portal area. A 138-kV transmission line was constructed from this line <br />to the substation at the "D" Portal area. This substation transforms the 138 kV to 13.8 kV. The <br />approximate route for this line is shown on Map 22. Some clearing and road construction was <br />required for construction of this power line. All earth disturbances were reclaimed immediately after <br />construction was completed. <br />The 138-kV power line structures consist of two wood poles connected with wood cross members to <br />form an "H frame" structure. The pole structures are approximately 55 feet high and spaced about <br />600 feet apart. Excavation for the holes was by an auger. All excavated material not used for <br />backfilling was spread and seeded along with other areas disturbed during the construction of the <br />power line. <br />Both the 13.8-kV and 138-kV power lines were designed and constructed by Moon Lake Electric <br />Association. <br />The main substation at the "D" Portal transforms power from 138 to 13.8 kV and contains a 138-kV <br />oil-cooled circuit breaker, a 20.0-MVA transformer, metering equipment and a lineup of switchgear <br />for the 13.8-kV distribution. This substation occupies an area approximately 150 by 200 feet and is <br />• Permit Rev. 4 (11/2002) IV-24 <br />