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V. Hydrology <br />A. Ground Water <br />1. "Page 2-408. Mention was made that "no domestic, irrigation, stock, <br />commercial or industrial wells are located on the Mt. Gunnison No. 1 <br />Mine permit area". Is this statement true for the life of mine area? <br />If not changes should be made to include those wells." <br />The statement is true for the life of mine area. <br />2. "Page 2-409 is a summary of drilling and initial pump test data for <br />wells in the permit area. More detailed information will be needed for <br />these wells. The following should be submitted: <br />A. Map Locating These Wells <br />B. The Length of the Screened Interval <br />C. Depth of Wells <br />D. Observed Specific Yield <br />E. The Location of the Screened Interval Above the Coal Seam. <br />The mapped location of monitoring wells is provided in the permit <br />• application at Exhibit 2.S.L.C., "Location of Wells and Gaging Stations" <br />and 2.8.1.0.1 "Location of Wells and Gaging Stations revised." Dri11 holes <br />mentioned on page 2-409 which were not completed as monitoring wells are <br />located in the permit application on Exhibit 2.7.1.A, "Location Elevation & <br />Total Depth of Drill Holes." The length of screened interval and the depth <br />of the wells is provided in the permit application in the well completion <br />reports included in Exhibit 2.8.2.A.1. <br />Specific yield is a term used to define the specific storage for unconfined <br />aquifers. Specific yield cannot be determined directly from single well <br />aquifer tests. Reasonable estimates can be determined using literature <br />estimates for comparable geologic formations. Specific capacity informa- <br />tion is included in the permit application in the column labeled "Yield" in <br />Table 2.8.2.A.1., "Summary of Drilling and Initial Pump Test Data." <br />3. "Page 2-414 refers to Exhibit 2.8.2.A which is a composite barren <br />member well water level and spring elevation map. This map cannot <br />accurately represent the potentiometric surface of the overburden <br />aquifer because all springs regardless of their source will issue from <br />the land surface, thus the elevation of the spring will be the eleva- <br />tion of the land surface. A contour map drawn from the elevation of <br />these springs will have the same contours as the land surface. Addi- <br />tional monitoring wells must be installed to further define the <br />Potentiometric Surface, on either side of the divide. These wells <br />should be completed identically, pump tested and monitored for water <br />level." <br />• Exhibit 2.8.2.A, "Composite Barren h(ember Well Water Level and Spring <br />V-1 <br />