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iii iiiiiiiiuiiiii- C c~rp~us ~ Yampa Valley Cyprus Yampa Valley Coal Corporation 29587 Routt County Road #27 Oak Creek, Colorado 80467 303-879-3800 June 5, 1991 Tony Waldron, Reclamation Specialist Colorado Mined Land Reclamation Division 1313 Sherman Street, Room 215 Denver, CO 80203-2273 Dear Mr. Waldron, R~GEIV~~ JUN ~ 1991 Mined ~~nd Reclamali0n Division RE: Minor Revision 91-60. Substation Expansion and GroundinP Upgrade: Permit C-82-056 TCC is requesting a minor revision to the above-referenced permit to allow the expansion of substation #1 and upgrading of the grounds at substations 2, 3, 4 and a number of existing powerline poles. These measures will help avoid power outages which have occurred in the past as a result of lightning strikes. The expansion of substation 1 will entail the following: 1. Placement of a temporary powerpole to the west of the current substation to allow rerouting of wires from a pole within the substation; 2. Material in a 30' X 50' area will be excavated down to bedrock on the west end of the existing substation to allow installation of a ground mat. Material will then be placed back on top of the ground mat, followed by a layer of sand and a layer of gravel; 3. For the expansion, a concrete slab measuring 22 feet by 15 feet will be constructed, and transformer(s) and switches will be placed on this slab. 4. Within the substation, 2 power poles will be placed on the west end to support capacitors and fuses for the substation's high voltage lines. The substation will then be fenced to restrict access. Drainage control for the substation will remain unchanged except for the existing culvert having an extension welded on to allow backfilling and pad construction adjacent. Location of the proposed substation expansion is shown on enclosed Map 24 (Surface Facilities and Freshwater Systems).