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<br /> <br />• <br /> <br />MINE INFLOM MITIGATION PLAN ~~~~~ ~ ~~ <br />Matthew S. Sakurada, P,E, <br />JUN 1 1 1985 <br />iNTRODIICTION MINED LAND <br />RECLAMATION DIVIS~Of~ <br />Colorado Westmoreland inc, has proposed water replacement plans for poten is <br />subsidence-induced phenomena in Volume 5A - Water Replacement Appendices. The <br />Colorado Mined Land Reclamation Division, Bureau of Land Management, and local <br />water users have reviewed and approved of these plans. <br />Further concern has been raised by the Colorado Mined Land Reclamation Division <br />on the inflows to the mine from natural seepage due to normal mine development. <br />This does not consider subsidence-induced phenomena which is covered in the <br />above mentioned plan, CWI, in an effort to address all concerns about future <br />mine development, submits a mitigation plan for mine inflows based on predic- <br />tions that are made based on theoretical calculations and would be confirmed <br />when actual mining takes place, C,WI does not anticipate mining in the areas un- <br />der East Roatcap Creek or Stevens Gulch for approximately ten (10) years, <br />PROCEDURE <br />CWI contracted Vladimir Straskraba of Hydro-Geo Consulting in Golden, Colorado, <br />to calculate the anticipated inflows. That report is included within this ap- <br />pendics, in general, the work performed followed the following steps: <br />I. Evaluation of existing CWI inflow as suhmitted in Annual Hydrology and Sub- <br />sidence Reports. <br />2. Evaluation of other area mine inflows, specifically the Somerset Mine and <br />Red Canyon Mine. <br />3. Literature search for procedures and approximate parameters. <br />4, Theoretical calculation of anticipated inflows under a) Stevens Gulch; h) <br />East Roatcap Creek; and c) the remainder of the mine, <br />5. Predict impacts of mine inflow, <br />fi. Recommend monitoring program, <br />7. Propose post-mining alternatives, <br />This mitigation plan will analyze more specifically the impacts on water users <br />and propose specific mitigation plans to those impacts. <br />IMPACTS OF MINE INFLOW ON WATER USERS <br />The folorado Mined Land Reclamation Division has asked to specifically study the <br />impacts on water users in the Stevens fulch and East Roatcap drainage areas. <br />Stevens Gulch <br />The summary of water resources contained within Stevens Gulch drainage basin is <br />found in the water replacement plans for subsidence induced phenomena. Mine <br />