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Rule 2.04.6(3)(a)(iii) - A description including an appropriate map and cross sections prepared to <br />the standards of 2.10 which shows the geology of the Wolf Creek Coal Seam including: <br />(A) The logs of drill holes, test borings or other samples showing the lithologic characteristics, <br />physical properties and thickness of the interburden of the Wadge Coal Seam and the Wolf <br />Creek Coal Seam and the Wolf Creek Coal Seam itself. <br />(B) The location of subsurface water not previously identified <br />(C) Chemical analysis of the Wolf Creek Coal Seam for acid - forming or toxic - forming materials. <br />(D) The chemical analysis of the stratum immediately above and below the Wolf Creek Seam for <br />acid - forming. Toxic - forming or alkalinity - producing materials and their content. <br />(E) The thickness and engineering properties of clays or clay shale, if any, in the stratum <br />immediately above and below the Wolf Creek Coal Seam. <br />TC Response - At the time the revision applicaton was prepared and submitted, the avalible <br />information on site geology was somewhat limited, as reflected in the baseline information <br />submitted. Ongoing drilling and material analysis have provided significant additional <br />information , as reflected in the revised and expanded baseline text descriptions and associated <br />maps and supporting materials which accompany these responses for replacement or insertion in <br />the PAP. This revised and expanded information addresses the noted requirements for Rules <br />2.04.6(3)(a)(I - iii). The following are additional comments or clairifications relative to the <br />specific geologic information requirements: <br />• The referenced Drawing 1 of Exhibit 53 shows only the Wadge /Wolf Creek lithologic <br />sequence, which is only a small segment of the overall lithologic column shown by the <br />approved Figure 2 in the PAP. It is, however, labeled as "Wolf Creek Seam - Typical <br />Geologic Column ", to reflect this distinction. <br />• With the additional geologic information obtained from the ongoing drilling, Map 23d <br />has been updated to show the Wolf Creek interburden thickness. <br />• All drilling to date has not encountered any significant groundwater below the Wadge <br />Coal Seam, as evidenced by the lack of increases in return flows during the drilling <br />operations. <br />• The lithologic sequence does not include any significant clay layers immediately above <br />or below the Wolf Creek Coal Seam. <br />Division Response - The revised submitted material is adequate per Rules 2.04.6(3)(a)(i), (ii), and <br />(iii)(A), (B), (D), and (E). The chemical analysis submitted with revised Exhibit 53 only include <br />the chemical analysis of roof and floor materials analized in holes WC003, 004, and 008. Based <br />on the Chain of Custody information, no Wolf Creek coal was submitted for analysis. As such no <br />-'c��a <br />1313Sherman Street, Room 215, Denver, CO 80203 P 303.866.3567 <br />I <br />1876 <br />