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EDNA MINE - 2004 EROSION INVENTORY REPORT <br />OVERVIEW <br />Section 4.3 of Permit No. C-80-001 requires an annual erosion inventory of the Edna <br />Mine's permanently reclaimed lands that remain under bond. The permit requires that an <br />inventory report be submitted to the CDMG on or before July I S of each year. The first erosion <br />inventory was performed in the spring of 1992 after the initial approval of the referenced permit <br />section. This survey included the South-of--Shop areas and the South-of--Shop erosion feature. <br />The second inventory was conducted in the fall of 1992. The two inventories conducted in 1992 <br />were included in the 1993 report. The third inventory as conducted in the fall of 1993 for the <br />1994 report. Further changes in the permit language resulted in the inventories being performed <br />in the spring of each yeaz, starting with the 1995 annual erosion inventory. The West Ridge area <br />had some preliminary inventories performed during previous years, however they did not <br />conform to the azea designation currently used. Therefore, the preliminary data is not included in <br />the inventory report. Data in this report is limited to 1996 through 2004 due to space limitations <br />in the table. <br />Areas permanently reclaimed that are currently required to be inventoried under the plan <br />include the Moffat Area, and the West Ridge. The South of Shop area was released in 1999 and <br />is no longer inventoried. In the Moffat Area, a total of ] 0 blocks are included in the monitoring <br />plan. Initial monitoring of portions of the Moffat Area began in 1992 as reclamation activities <br />were completed on various blocks. Block 10 of the Moffat Area was added to the inventory in <br />1997 as a result of completing reclamation activities on the area during the fall of 1996. All of <br />the West Ridge area was incorporated into the inventory aRer the completion of the terraces in <br />late 1995. The inventoried areas are indicated on Exhibit 1, Sheets 1 and 2, of this report. In <br />August 2003, the Goat Trail Area was released from bond. Therefore, monitoring of <br />concentrated flow features and the C-Building hillslope azea was completed in 2003. <br />INVENTORY METHODS <br />Pedestrian and vehicular surveys were conducted on permanently reclaimed areas to <br />inventory erosion features. The areas examined and individual features noted were evaluated as <br />outlined in Section 4.3. <br />Evaluation of the overall erosion condition of various reclaimed areas was performed in <br />accordance with the Bureau of Land Management's Erosion Condition Classification System <br />described in Technical Note No. 346. This classification system considers both sheet erosion, <br />and rill and gully activity. As such, the system approach enables the overall erosion condition of <br />a given site to be documented. Technical Note No. 346 is provided in Permit No. C-80-001 as <br />Appendix 4.3-B. <br />1 <br />