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IV.E Electrical Distribution System <br />Existing powerlines are shown on Map 22. <br />The 13.8-kV powerline 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 minor <br />tree and brush clearing was required. Any areas disturbed during powerline construction were <br />immediately reclaimed. <br />The 13.8-kV powerline structures are single wood poles approximately 30 feet high and spaced about <br />350 feet apart. Excavation for the holes was by an auger. All excavated material not used for backfilling <br />was spread and seeded along with other areas disturbed during construction of the power line. <br />The 13.8-kV line was not routed near the 138-kV line due to economic considerations. The route for this <br />power line crosses mine areas which have been and will be subsided. The route for the 138-kV tine is <br />much longer. It was originally constructed in anon-subsidence corridor, however, due to changes in the <br />mine plan, it is also in areas which may be affected by mine subsidence. Raptor proof 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 to <br />the substation at the "D" Portal area. This substation transforms the 138 kV to 13.8 kV. The approxi- <br />mate route for this line is shown on Map 22. Some clearing and road construction was required for <br />construction of this power line. All earth disturbances were reclaimed immediately after construction <br />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 600 <br />feet apart. Excavation for the holes was by an auger. All excavated material not used for backfilling was <br />spread and seeded along with other areas disturbed during the construction of the 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 for <br />the 13.8-kV distribution. This substation occupies an area approximately 150 by 200 feet and is <br />enclosed by a chain link fence 6 feet high with 1 foot of barbed wire overhang. Foundations for the <br />circuit breaker, transformer and switchgear are reinforced concrete slabs on grade. <br />Mine Permit Renewal #3 (Rev. 8/99) IV-24 <br />