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/ ~~ Kennecott <br />• .Energy <br />Colovryo Coal Mine <br />5731 State Highway 13 <br />Meeker, Colorado 81641 <br />Telephone: (970) 824-1579 <br />Fax: (970) 824-1598 <br />Mazch 24, 2006 <br /> <br />Mr. Jim Stazk <br />Environmental Protection Specialist <br />Colorado Division of Minerals & Geology <br />1313 Sherman Street -Room 215 <br />Denver, Colorado 80203 <br />e1+pE,b~~~~ <br />MAR ~9 2tfl~ <br />Tay Tonoal <br />Sr. Environmental Engineer <br />6iviSion #~Vlinyral~~~i~plo®y <br />Oiviaion o more s <br />RE: Technical Revision No. 64, Revision to Streeter Draw Fill Monitoring and Section 16 <br />Fill Monitoring, Colowyo Coal Mine, Permit No. C-81-019. <br />Dear Mr. Stark, <br />Enclosed please find three copies each of the text changes associated with TR-64. As both fills <br />have been completed, they are no longer under construction. Our understanding of the inspection <br />and monitoring requirements under Rule 4.09.1 and 4.09.2 is that monitoring is no longer <br />required following construction. Thus, this change eliminates monitoring for both fills. <br />Monitoring for the West Pit Fill will continue unchanged. <br />t <br />Also included is a tracking sheet listing these text changes. Note that the current permit text <br />discusses the Streeter Fill under Section 4.09, while the monitoring requirements for the Section <br />16 Fill are discussed in Volume SB, Exhibit 19. <br />We have also reviewed the historical text discussion presented in Section 2.06 for the Streeter Fill <br />but do not see a need for changes at this time. <br />You will note that we have decided to leave the historic discussion of fill monitoring for both <br />Streeter Fill and the Section 16 Fill lazgely intact and have only modified the verb tense of this <br />discussion. Should you feel that this historical discussion is not needed, it could be removed. <br />With this change, the mine commits to completing a final report and map for both the Section 16 <br />Pit Fill and the Streeter Draw Fill. These will be completed following the 2006Q2 inspection of <br />both fills. These materials would be stored at the minesite with the other inspection reports but <br />not made part of the permit documents. Note that both the 6700 Streeter Fill well and the Section <br />16 Fill well are shown on Map 37 and both of these remain in the monitoring program. We <br />believe that annual monitoring of both piezometers is appropriate. <br />Antelope Mine • Colowyo Mine • Cordero Rojo Mine • Jacobs Ranch Mine • Spring Creek Mine <br />;. member of the Rio Tinto Group <br />