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Memo - Dan Mathews - 3 - February 21, 1991 <br />Tab 17 is titled "Probable Hydrologic Consequences" and is a thorough <br />discussion of projected impacts due to pit infl ows, pumping from the Trout <br />Creek Sandstone and spoil spring development. The principal concern will be <br />dissolved-solids loading of Dry Creek, which will ultimately receive all spoil <br />spring discharge from the back filled pits. The projections of post-mining <br />water quality appear reasonable, and downstream water users should not be <br />impacted. <br />In summary, the adequacy issues are: <br />- Explain the very high TSS concentrations on certain ground water samples. <br />- The currently approved spoil spring monitoring program should be <br />discussed further. <br />- Clarification of proposed changes in the ground water monitoring <br />schedule, as discussed above. <br />- If either Pond 005 or Pond 006 (or both) is not approved as a permanent <br />structure, Peabody will need to find an alternative source for <br />replacement of the three destroyed water sources. <br />gaw <br />3571E <br />