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the fact that there will be no surface disturbance which would cause any sites to the disturbed. TCC's experience has
<br />shown that, except for areas where there are cliffs or significant outcrops, undermining and subsiding these areas
<br />does not result in any surface disturbance, therefore, no surveys are required for these areas.
<br />NW Mains Ventilation Shaft and Thickener Underflow Project (TRO1-39)
<br />i
<br />TCC contracted with Metcalf Archaeological Consultants, Inc. to complete a cultural resources survey of two
<br />potential shaft sites for the new NW Mains ventilation shaft, along with the associated access roads and powerline,
<br />located in sections 16, 17, 20, and 21, TSN, R86W. The only cultural or historical site encountered was a previously
<br />recorded historic irrigation ditch (Site SRT921). The site was determined as not eligible for the National Register
<br />and no further archaeological work was recommended. Survey results are presented in the Confidential Appendix,
<br />in Exhibit 6M, NW Mains Ventilation Shaft -Cultural Resources Survey.
<br />NMD (Panels 17 Right through 23 Right) (PR 03-06)
<br />No new surface facilities are planned for the Northern Mining District. In reference to the SW/4 of Section 3, S/2 of
<br />Section 4, E/2 of Sections 7, Sections 7-10, N/2N/2 of Section 16, and the N/2 of Section 17 all in TSN, R86W, the
<br />survey was not required due to the fact that there will be no surface disturbance which would cause any sites to the
<br />disturbed. TCC's experience has shown that, except for areas where there are cliffs or significant outcrops,
<br />undermining and subsiding these areas does not result in any surface disturbance, therefore, no surveys are required
<br />for these areas.
<br />18 Right Ventilation Shaft (TR 04-44)
<br />TCC contracted with Metcalf Archaeological Consultants, Inc. to complete an intensive Class III cultural resources
<br />survey of a potential shaft site for the new 18 Right intake ventilation shaft, along with the associated access road,
<br />located in Sections 2, 10, and 11, TSN, R86W. At the same time, Metcalf's project also included a Class III cultural
<br />resource survey of a second potential shaft site, four proposed seismic lines, and three proposed coreholes. Four
<br />isolated finds and a previously recorded site (SRT157) were found to be within the area of potential effects for the
<br />projects. The isolates were determined to be non-significant resources and required no additional work. Site
<br />SRT157 was recommended as "need data" by previous investigators at the time of the survey. Limited testing was
<br />conducted at this site to help determine its eligibility. No buried cultural material was recovered during the testing.
<br />Therefore, Metcalf recommended in their evaluation, that SRT157 be listed as not eligible. No significant cultural
<br />material was encountered during the survey and Metcalf recommended cultural resource clearance for both of the
<br />shaft sites, seismic lines and corehole sites. Survey results are presented in the Conftdential Appendix, in Exhibit 6n,
<br />Twentymile Coal Company's 2004 Exploration, Class III Cultural Resource Inventory of Proposed Seismic Lines,
<br />Drill Locations and Air Shafts, Routt County, Colorado, dated November 2003.
<br />6-North Mains Ventilation Installation (MROS-198)
<br />The intensive Class III cultural resources survey for the 18-Right Shaft, referenced above, included the site for the
<br />proposed new 6-North Mains ventilation and ancillary facilities installation, along with the associated access road,
<br />located in Section 17, TSN, R86W. Survey results for this site are as summarized in the preceding paragraph for
<br />TR04-44. The pad location was shifted and expanded to accommodate apower-drop borehole into the mine, so
<br />supplemental cultural resource investigations were completed during Spring-2005. Additional cultural resource
<br />survey investigations were conducted during Fall 2007 for the 6MN Mine Water Storage Reservoir. The resulting
<br />survey documentation, which indicated no significant cultural resources, was submitted separately to the CDMG for
<br />insertion in Exhibit 60.
<br />RULE 2.04.5 -GENERAL DESCRIPTION OF HYDROLOGY AND GEOLOGY
<br />(1) Each application shall contain a description and map, prepared in accordance with 2.10, of the geology,
<br />surface and ground water systems. including water quality and quantity, of all lands within the proposed permit area,
<br />• the adiacent area, and the general area. The description shall include information on the characteristics of all surface
<br />and ground waters within the general area,
<br />TR07-62 2.04-9 09/ 10/07
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