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'Richard Mills <br />Page 2 <br />October 1, 1997 <br />Coal Company will mitigate subsidence damage to Routt County Road No. 27. (Rule 4.20.3, <br />2.05.6(6)(f)(iii) and (iv), and 33-34-121(2)(a)) <br />3. The Division has observed a structure in the SW'/. Section 28, TSN, R86W, (microwave tower), <br />on the Twentymile outcrop east of Routt County Road No. 27. This structure is not discussed <br />permit section 2.05.6(6) nor is it identified on Map 23B "Structures and Renewable Resources". <br />This structure needs to be identified and addressed as per Rule 2.05.6(6). <br />4. Longwall panel lengths were revised during TR-28 to reflect shortened panel lengths ranging from <br />10,000 feet to 17,000 feet. Revised pages 2.05-2(a), 2.05-10(d) [8/11/97] describe the panel <br />lengths as l 1,000 to 22,000 feet. is it Twentymile Coal Company's intent to revise the panel <br />lengths to the longer lengths? Map 23 reflects the shortened lengths described in TR-28 revised <br />pages. Please correct the panel length descriptions. <br />A typo was noted on revised page 2.05-(0(c), last paragraph, line 6. The entries are described as <br />being driven on 100 foot "cents". The Division believes that this should read "centers". Please <br />revise appropriately. <br />6. As a result of TR-27, the permit area boundary for the Foidel Creek Mine include the E%z Sec 12 <br />TSN, R86W. Please revise Map 23 to reflect this boundary change. <br />Upon review of Permit section 2.05.6(6) ,the Division noticed several statements that need <br />updating. <br />a. Page 2.05-124(c) states that, "Also, the predictions for panels 5 Right and 6 Right do not <br />contemplate undermining or subsiding of the county road overpass." ,and page 2.05-126 <br />indicates that no impact to Routt County Road No. 27 or the Rail Road overpass is <br />anticipated. With the proposed configuration of the submains, the Division considers that <br />these statements need to be revised. <br />b. Page 2.05-124(d), second paragraph, describes impacts to two residences in the SE'/. <br />Section 22, TSN, R86W, and states, "all the residences are located outside the proposed 5 <br />year permit azea. Therefore, no impacts to the occupants should be realized before 1999:' <br />Paragraph 3 on this same page describes impacts to the barn in Section 22 <br />With Twentymile Coal Company's revised Mine plan, impacts to these structures would <br />be expected sooner than stated on page 2.05-124(d). Please revise these statements to <br />reflect proposed Mine plans. <br />The Division time frame for review and decision on Twentymile Coal Company's responses to these <br />concerns is October 1 1, 1997. Please submit your responses by October 9, 1997 to provide the Division <br />