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. _. ; <br /> <br /> <br />DEPARTMENT OF NATURAL RESOURCES <br />David H. Ge[ches, Executive Director <br />MINED LAND RECLAMATION DIVISION <br />DAVID C. SriELTON, Director <br />Richard D. Lamm <br />Governor <br />DATE: April 5, 1985 <br />T0: Anne Baldrige <br />FROM: Steve Renner <br />RE: Seneca II, 1984 Annual Hydrology Report <br />After reviewing the Seneca II Annual Hydrology Report, I have come to the <br />enclosed conclusions. <br />Generally, the Report was well prepared, and the interpretation of data seems <br />well founded. The data was presented fairly clearly, however there are some <br />changes I would like to see for the next year. <br />A. Groundwater System <br />During 1984, Seneca II monitored 44 wells, each of which were visited <br />at least quarterly. <br />Most wells, for the second year, exhibited an increased average annual <br />water level. This is due to the unusually high precipitation and <br />runoff of 1984, lithology, local structure, and proximity of recharge <br />areas to the monitoring points. <br />Thirteen "bedrock" wells displayed an average annual head increase of 2 <br />feet or more, while two wells lost two feet or more of average annual <br />head. The loss of head in well GW-S36-WC (Wolf Creek coal completion) <br />is due to the advance of mining toward the well. Well GW-S30 {Wadge <br />coal completion) is immediately down-dip of a recent box cut, and has <br />thus lost almost 5 feet of head in 1984. <br />The seven alluvial completion wells mirrored the flow of the associated <br />stream, and no dramatic or unusual changes in head were noted. <br />The remaining 22 wells showed no significant change from 1983 to 1984. <br />(A 2 foot change in average annual head was arbitrarily assigned as a <br />significant change.) <br />423 Centennial Building, 1313 Sherman Street Denver, Colorado 80203 Tel. (303) 866-3567 <br />