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III IIIIIIIIIIII!!II 999 EDNA MINE - 1997 EROSION INVENTORY REPORT OVERVIEW Section 4.3 of Permit No. C-80-00] requires an annual erosion inventory of the Edna Mine's permanently reclaimed lands that remain under bond. The permit requires that an inventory report be submitted to the CDMG on or before July 15 of each year. The first erosion inventory was performed in the spring of 1992 after the initial approval of the referenced permit section. This survey included the South-of--Shop azeas and the South-of-Shop erosion feature. The second inventory was conducted in the fall of 1992. The two inventories conducted in 1992 were included in the 1993 report. The third inventory as conducted in the fall of 1993 for the 1994 report. Further changes in the permit language resulted in the inventories being performed in the spring of each yeaz, starting with the 1995 annual erosion inventory. The West Ridge area had some preliminary inventories performed during previous yeazs, however they did not conform to the area designation currently used. Therefore, the preliminazy data is not included in the inventory report Areas permanently reclaimed that are required to be inventoried under the plan include the Moffat Area, West Ridge, and an approximately 10 acre strip in the South of Shop. In the Moffat azea, a total of ] 0 blocks aze included in the monitoring plan. Initial monitoring of portions of the Moffat area began in 1992 as reclamation activities were completed on various blocks. Block 10 of the Moffat area was added to the inventory in 1997 as a result of completing reclaznation activities on the area during the fall of 1996. All of the West Ridge area was incorporated into the inventory after the completion of the terraces in late 1995. The inventoried areas are indicated on Exhibit 1, Sheets 1 and 2, of this report. Additionally, concentrated flow features and one potentially unstable hillslope area are monitored. 'the concentrated flow features include the South-of--Shop Concentrated Flow Feature No. ] (monitoring began in 1992), and three exit channels along the Goat Trail (monitoring began in 1993). The monitored hillslope lies immediately upslope of the roadway that led to the C-building of the conveyor system. Monitoring of the hillslope began in the eazly fall of 1996 with the initial placement of monitoring pins. A summary containing the current year's results and the results of the previous four years of monitoring efforts, where available, is provided for comparative purposes. INVENTORY METHODS Pedestrian and vehiculaz surveys were conducted on permanently reclaimed areas to inventory erosion features. The areas examined and individual features noted were evaluated as outlined in Section 4.3. Evaluation of the overall erosion condition of various reclaimed areas was performed in accordance with the Bureau of Land Management's Erosion Condition Classification System described in Technical Note No. 346. This classification system considers both sheet erosion, and rill and gully activity. As such, the system approach enables the overall erosion condition of a given site to be documented. Technical Note No. 346 is provided in Permit No. C-80-001 as Appendix 4.3-B.