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<br /> <br />geologic and hydrologic relationships of the detention basins are <br />presented on Map 21a, Energy Mine No. 3 Detention Basin Croas- <br />Sections A-A' and B-B'. The discussion includes estimations of <br />seepage rates into and out of the basins, and reference to Table 2 <br />of Sahibit 3, which displays a complete chemical analysis of water <br />in the Mine No. 3 Detention Basin. <br />2. As part of the applicant's proposed reclamation plan, the Middle <br />Creek Pit will be backfilled and graded to approximate original contour. <br />This reclaimed pit will eventually fill with water to some undetermined <br />elevation due to discharge from the undisturbed bedrock aquifer, seepage <br />from adjacent backfilled spoils, and downward infiltration of <br />precipitation. A projection of the maximum anticipated water level <br />elevation within the reclaimed pit should be made, based on data and <br />observations from the site, and this information should be included in <br />the permit application. <br />RBSPONSS: <br />The requested information is contained on revised page 2.05- /\ / <br />168a and revised pages 6a and 6a' of Sahibit 3, Sediment Control <br />Plan. <br />3. Due to the potential for hydrologic cotmsunication between the <br />reclaimed pit, the adjacent Middle Creek Detention Basin, and the <br />alluvial aquifer system, the applicant should install a monitor well in <br />the backfilled and regraded Middle Creek Pit. Monitoring of water levels <br />and waer quality within this spoils aquifer will be very important in <br />evaluating long-term impacts to the-iydrologic balance of the area. <br />