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Inter-office Memorandum <br />to: File, 2004 Annual Hydrology Report, C-1980-001, The Pittsburg & Midway Coal Mining Co. <br />from: Byron G. Walker <br />subject: Review of 2004 Annual Hydrology Report, C-1980-001 <br />date: July 11, 2005 <br />A 2004 Annual Hydrology Monitoring Report (Annual Hydrologic Report, AHR) for the Edna Mine CDMG Permit <br />No. C-001-80 was dated February 2005. It was submitted to the Colorado Division of Minerals and Geology <br />(Division), and was prepared for The Pittsburg & Midway Coal Mining Company, by W WC Engineering. A number <br />of items as identified below have been brought to the attention of the operator in a review letter of adequacy. <br />Table of Contents <br />Rule 4.05.1(1) .................................................................................................................................. <br />Rule 4.05.1(2) .................................................................................................................................. <br />Rule 4.05.1(3) .................................................................................................................................. <br />Rule 4.05.12 ..................................................................................................................................... <br />Rule 4.05.12(1) ................................................................................................................................ <br />Rule 4.05.12(2) ................................................................................................................................ <br />Rule 4.05.12(3) ................................................................................................................................ <br />Rule 4.05.13(4) ................................................................................................................................ <br />Rule 4.05.13(4)(a) ............................................................................................................................ <br />Rule 4.05.13(4)(b) ............................................................................................................................ <br />Rule 4.05.13(4)(c) ............................................................................................................................ <br />Rule 4.05.13(4)(c)(i) ........................................................................................................................ <br />Rule 4.05.13(4)(c)(ii) ....................................................................................................................... <br />Rule 4.05.13(4)(c)(iii) ...................................................................................................................... <br />Review of Predicted Probable Hydrologic Consequences ............................................................... <br />CWQCCR 31 ................................................................................................................................... <br />CWQCCR 31.11 .............................................................................................................................. <br />CWQCCR 33.0 ................................................................................................................................ <br />CWQCCR 41 ................................................................................................................................... <br />Colorado Dischazge Permit System ................................................................................................. <br />........... 1 <br />........... 2 <br />........... 2 <br />........... 2 <br />........... 2 <br />........... 2 <br />........... 2 <br />........... 2 <br />........... 3 <br />........... 3 <br />........... 3 <br />........... 3 <br />........... 3 <br />........... 3 <br />........... 4 <br />........... 5 <br />........... 6 <br />........... 6 <br />........... 6 <br />........... 7 <br />Rule 4.05.1(1) Surface and underground mining activities shall be planned and conducted to minimize disturbance <br />of the prevailing hydrologic balance in both the mine plan and adjacent areas, and to prevent material damage to <br />the hydrologic balance outside the permit area in order to prevent long-term adverse changes do the hydrologic <br />balance. <br />Information in the AHR indicates that surface (this mine is a surface mine) mining activities were planned and <br />conducted in compliance with this rule. The disturbance to the hydrologic balance within and adjacent to the permit <br />Page 1 <br />