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III IIINIIIIIIIIIII RFCEIV~p . EDNA MINE - 1995 EROSION INVENTORY REPORT JUN 2 6 995 OVERVIEW 0~~~"O0 ~''~unerals 8 Geology Section 4.3 of Permit No. C-80-001 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 15th of each year. The first erosion inventory report of this process was done in the spring of 1993 after the initial approval of the referenced permit section. The second inventory was conducted in the fall of 1993 for the 1994 report. With further changes in the permit language the inventories will now be done in the spring of each year, thus this spring monitoring for the 1995 report. Several areas not previously detailed were added to this years inventory they are Blocks 7, 8 and 9 in the Moffat Area reclaim area. These areas have all received topsoil redistribution in the 1994 field season. The areas may be referenced on Exhibit 1, Sheet 1 of 2, of this report. Three concentrated flow features were also added for detailed monitoring. These features are all associated with drainage features constructed along the Goat Trail access road at the mine. No areas were removed from the monitoring list for this report. Areas permanently reclaimed that are required to be inventoried under the plan include the reclaimed areas, to date, on the Moffat Area, an approximately 10 acre strip in the South of Shop Area and areas permanently reclaimed on West Ridge. The West Ridge areas are currently exempt from inventory requirements pending construction of runoff control structures required by the West Ridge Hydrologic Reconstruction Plan. Five sections in the West Ridge Area were voluntarily evaluated, and are included in this report for future evaluation of the effectiveness of the West Ridge Hydrologic Plan's success. Results of the inventory are described below. The inventoried areas are referenced to Exhibit 1, Sheets 1 and 2, of this report. INVENTORY METHODS Pedestrian and vehicular surveys of permanently reclaimed areas were conducted to inventory erosion features. Individual features and entire sites were evaluated as outlined in Section 4.3. The existing condition of the single concentrated flow feature, identified in the 1992 report in the South of Shop Area, and the three features mentioned above on the Goat Trail were documented using method (1) ("Cross-Section Survey") outlined in Permit No. C- 80-001, Section 4.3. This method was chosen to determine the rate of degradation or agradation within these reaches over time. 6/22/95 DLB