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<br />STATE OF COLORADO <br />Roy Romer, Govei <br />DEPARTMENT OFNATURALRESOURCES <br />iiiiiiiuiiiiiiiiii <br />999 <br />MINED LAND RECLAMATION DIVISION <br />FRED R. BANTA, Director <br />DATE: May 8, 1989 <br />T0: Jim Stevens <br />FROM: David Berm <br />RE: Adequacy Review - Issues Pertaining to Surface Water Hydrology - <br />Rimrock Coal Company - C-89-074 <br />This memorandum summarizes the various surface water hydrology issues which <br />must be resolved before we can issue an approval decision for the Rimrock <br />Coal Company Permit Application (C-89-074). All sections of the application <br />pertaining to surface water hydrology were reviewed. In accordance with your <br />instructions, however, this memorandum will not address water quality impacts <br />related to overburden handling (2.05.3(6)), coal processing and non-coal <br />processing waste management (2.05.3(8)), disposal of debris, acid forming <br />and toxic forming materials, nor the potential water quality impacts related <br />to exposure of existing or new underground mine drainage sources. <br />The headings within this memorandu <br />presented in the application. In s <br />precisely coincide with the actual <br />lication Form <br />m are organized according to the order <br />ome cases, this organization does not <br />organization of our Rules and Regulations. <br />1. The permit acreage provided with the application form (47,85 acres) is <br />snot consistent with acreage information found elsewhere in the document. <br />C~sj~' `(6~~The hydrology calculations used in later sections are based on a permit <br />~,~ ~~~~`~ acreage of approximately 38.0 acres. This number is substantiated by <br />Rio' digitizing maps such as Map KK and Map 11. Page 1 of Section 2.04,7.2 <br />~~ indicates a lease acreage of 38 acres. The applicant should provide <br />information which clarifies this apparent discrepancy. <br />Also the application projects 15.6 disturbed acres and 28.87 affected <br />acres. The 15.6 value coincides with the two phase mining plan, but <br />. ac ~`~ would not be accurate if the channel area is mined, and it does not <br />.~,,,k~'' appear to account for other areas disturbed such as processing areas, <br />topsoil storage, etc. Specific and accurate disturbed area acreage <br />values must be provided to ensure compliance and to ensure that hydrology <br />related calculations are adequate. <br />2.04.5 - General Description of Hydrology (and Geology) <br />The operator has provided adequate general information. Possible <br />inadequacies pertaining to baseline hydrology information are discussed <br />below. <br />215 Centennial Building, 1313 Sherman Street Denver, Colorado 80203-2273 Tel. (303) 866-3567 <br />