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• <br />SAGE CREEK AND WOLF CREEK MONITORING WELLS <br />Introduction <br />Seneca proposes to install a series of wells to monitor groundwater in the geologic interval containing <br />the Sage Creek and Wolf Creek coal seams. The data collected will be used to document and monitor <br />the groundwater zones that could potentially be affected by mining a portion of the Sage Creek/Wolf <br />Creek reserve at II-W South. Following is a description of the activities associated with the installation <br />of the proposed wells. <br />Drilling/Well Installation Program <br />It is proposed to drill and install five 151 wells drilled and installed at one consolidated site, as shown <br />on Figure MR 49-1, Sage Creek and Wolf Creek Monitoring Wells Site. The wells will be installed to <br />provide data and information for the following intervals: <br />• Well 1 -Sage Creek Coal Overburden <br />• Well 2 -Sage Creek Coal Seam <br />• • Well 3 -Wolf Creek Coal Overburden <br />• Well 4 -Wolf Creek Coal Seam <br />• Well 5 -Wolf Creek Coal Underburden <br />As indicated on Figure MR 49-1, the monitoring wells would be located in the designated barrier pillar <br />associated with the auger mining activities. By locating the wells in this area, it will ensure that the <br />wells would be undisturbed and could be used for long-term monitoring. <br />Access to the proposed well locations would be via an existing jeep trail, which currently provides <br />access to Sediment Pond 016. The wells will be located adjacent to the currently approved area of <br />disturbance, as shown on Exhibit 12-3, Operations Plan II-W L.O.M. In the short-term a drill pad <br />approximately 50' x 1 50' will be constructed adjacent to the jeep trail to the drilling site. The topsoil <br />will be "wind rowed" along the edge of the drill pad until the wells are completed. The drilling site will <br />be re-topsoiled and re-seeded soon as feasible after completion of the wells. <br />Reclamation Costs <br />Upon completion of mining, final abandonment of the monitoring wells will be done in accordance with <br />methodologies described in Tab 18. The costs associated with final abandonment of these wells are <br />• reflected in the reclamation bond calculation in Tab 25. <br />12-3-1 Revised 05/01 <br />