2012-07-13_REPORT - M1988044 (3)

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done a few days after this event. A second examination of the affected areas was done on July 3 and strong recovery was already noted in the sedimentation areas. The East Valley apparently received a great deal of rain, as has occurred in the past with this valley. A flash flood down this drainage completely removed the stream crossing along with some of the old culverts. This crossing, which appears to date back to the Bombing Range use as a bombing range, had been affected before, but this was the most it had been affected in probably more than half a century. The crossing was replaced and new culverts installed while two of the older culverts are still in place. It appears that the crossing was overtopped by the flood waters and back cutting is what removed the crossing. The volume of water was simply too great for even the large culverts to handle. Debris also was likely a problem. Downstream from the confluence of the East Valley and Coal Creek, damages were minor with small amounts of sedimentation in some places. These areas should recover quickly. It appears from the pattern of sedimentation and flow that the various wetlands and riparian vegetation that has been allowed to develop over the last six years or so did an excellent job in preventing the storm waters from inflicting serious damage downstream. This storm event was an excellent test and showed that the management actions for the riparian corridor have been very effective at attenuating peak flows. 2. Topsoiling - As no land was ready for final reclamation, no topsoil was spread in the last year. A. Locations of topsoiling - As no land was ready for final reclamation, no topsoil was spread in the last year. B. Depth of topsoiling - As no land was ready for final reclamation, no topsoil was spread in the last year C. Final grading of topsolled lands - As no land was ready for final reclamation, no topsoil was spread in the last year 3. Accommodation for drainage - Drainage in recently completed portions is stable with only a small amount of sheet erosion during the intense storms of early June 2012. 4. Revegetation - No land was seeded in the last year. 5. Status of Prior Revegetation Areas - A. Status of newest seedings as of report date - No new seedings were done. Therefore, comments on revegetation status is covered in the next section. E. Status of older revegetation as of report date (describe growth rates, cover, invasive species, native invasion, and difficulties) - In June 2012, all older revegetation sites that had not been released were inspected by the Division of Reclamation, Mining and Safety (DRMS). All areas were approved for release. Therefore, these areas will no Status report for 2012 due July 15, 2012 Page 5 of 8