GENERAL54792

• Permit No: C1980001
• IBM Index Class Name: General Documents
• Doc Date: 7/17/2000
• Doc Name: 2000 EROSION INVENTORY REPORT
• Media Type: D
• Archive: No

OVERVIEW

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EDNA MINE - 2000 EROSION INVENTORY REPORT
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 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 areas and the South-of--Shop erosion feature.
The second inventory was conducted in [he 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 years, however they did not
conform to the area designation currently used. Therefore, the preliminary data is not included in
the inventory report.
Areas permanently reclaimed that are currently required to be inventoried under the plan
include the Moffat Area, and the West Ridge. The South of Shop area was released in 1999 and
is no longer inventoried. In the Moffat area, a total of ] 0 blocks are 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 reclamation activities on the azea during the fall of 1996. All of
the West Ridge azea 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 three exit channels along the Goat Trail
(monitoring began in 1993). The monitored hillslope lies immediately upslope of the reclaimed
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 five years of monitoring efforts, where
available, is provided for comparative purposes.
INVENTORY METHODS
Pedestrian and vehicular 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
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