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Brock Bowles 2 February 7,2012
<br />TR- Revisions:
<br />1. Maps 15 -3, 18, 20, 21 -3 (Volume II) and Figures 1, 2 and 3 (Volume IX) were
<br />revised to reflect the revised Gob Pile #2 configuration and the revised location of the
<br />West Diversion Ditch #2. Maps 15 -3, 21 -3 and Figures 1 and 2 were revised to show
<br />the change in topography for Gob Pile #2. Figure 3 was revised to reflect changes to
<br />the ditch and pond design. Map -18 was revised to show the change in the Post - Mining
<br />Topography and the ditch design details were updated. Map -20 was revised to show
<br />changes to drainage areas H -1 and F and update topography associated with Gob Pile
<br />#2.
<br />2. Volume IX, Appendix B, Probable Hydrologic Consequences section (pages App.
<br />B -1 through B -8), the Ditch and Culvert Summary page (page App. B -9), and SedCad
<br />Designs for Ditches F3, F4, F7, F11, F14, East Diversion Ditch, West Diversion Ditch
<br />#2, and Culvert F2 (pages App. B- 14,15,18, 22, 25, 31, 32, 32i, 34, 34i). The
<br />Subwatershed Hydrology Detail was revised due to drainage areas being revised for the
<br />West Diversion Ditch #2 (Pages App. B -35 through 39). The East Diversion Ditch
<br />design was revised as an error in the drainage area was discovered while updated the
<br />Probably Hydrologic Consequences section. Page App. B -40 which shows the peak
<br />flow used to size the Emergency Spillway was revised due to the increase in.
<br />3. The text for Gob pile #2 in Volume IX was updated to reflect the changes associated
<br />with expanding the waste pile to the west. Appendix A in Volume IX was updated to
<br />reflect changes to the material balance.
<br />Please feel free to call me if you have any questions.
<br />Sincerely,
<br />Ct-fACVM )1C12_
<br />Tamme Bishop, P.E.
<br />Project Engineer
<br />Enclosures:
<br />Volume II: Maps 15 -3, 18, 20, 21 -3
<br />Volume IX: Pages 1, 3, 4, 7, 11, , Figures 1, 2, & 3, Appendix A, and pages App. B -1
<br />through B -9, 14,15,18, 22, 25, 31, 32, 32i, 34, 34i, B -35 through 40.
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