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In May 2007, HGTI placed a 12 -foot by 60 -foot mobile trailer (approved under NR -15) adjacent <br />to the office /change building trailer to house additional offices. This trailer is is <br />insulated, electrically heated, lighted and ventilated. It will not have a water or sewage <br />system. <br />A passenger car parking area is provided at the office building complex. A new, gravel - <br />surfaced parking area will be constructed at the truck loading building. However, the <br />parking area at the loadout building will be within the existing disturbance boundary and <br />will not increase the disturbed area. <br />Wastewater and Stormwater Facilities <br />There is an existing septic system that is used to collect all wastewater from the <br />office /change house trailer. The location of the septic system is shown on Exhibit 12 -2, <br />Surface Water Control Plan Map (see both Revision 5, TR -04 Incidental Permit Boundary <br />Change, dated 8/99, or Revision 11, MR -15, dated 03/07). Storm water runoff from the <br />facilities area is accumulated in the two sedimentation ponds. The sediment ponds are <br />permitted with Colorado Water Quality Control Division under Colorado Discharge Permit <br />System Permit No. COG- 850008 (see Tab 13). <br />Power Transmission <br />Power transmission facilities entering the permit area is owned by Yampa Valley Electric <br />Association (YVEA) . The electrical substation adjacent to the office complex is also owned <br />by YVEA. The transmission line easement agreement and substation warranty deed are <br />presented in Tab 3. Power transmission facilities are shown on Exhibit 12 -1, Facilities Map <br />(see both Revision 9, TR -04 Incidental Permit Boundary Change, dated 8/99, or Revision 14, <br />MR -15, dated 03/07). <br />MR -16 20 Revised 11/07 <br />• <br />