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2009-10-26_INSPECTION - C1980005
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2009-10-26_INSPECTION - C1980005
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Last modified
8/24/2016 3:56:28 PM
Creation date
12/1/2009 2:59:26 PM
Metadata
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Template:
DRMS Permit Index
Permit No
C1980005
IBM Index Class Name
INSPECTION
Doc Date
10/26/2009
Doc Name
OSM Inspection Report
From
OSM
To
DRMS
Inspection Date
7/14/2009
Email Name
DTM
Media Type
D
Archive
No
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Seneca I:I Mine. Phase I bond release, ,ng. 3_ <br />8 channel up from the "V-4 ditch" junction at 18%. One location downgrade of a turf <br />reinforcement mat (TRM) segment between the "V-3 and 4 ditches" is still experiencing some <br />scour due to very little vegetation. The location of a shrub test plot in the East Wadge Pit <br />reclamation area contributes to this problem. The 50-foot segment of scour flows toward the <br />edge of the channel and needs to be graded-out with riprap placed along the edge. The <br />remainder of the PM-8 channel below the "V-4 ditch" junction appears to be stable, vegetation <br />has established through the riprap, and we measured a representative slope at 18%. <br />We walked the embankment for Pond 8 and determined that it is stable. The water discharging <br />on the other side of the embankment was clear, and Mr. Mathews noted that any slope erosion <br />that occurs could be repaired by handwork. <br />The Solid Waste Disposal Facility was also inspected and we measured a representative slope of <br />16% on the valley headwall section of the area. We also measured a west-facing side slope of <br />the upper PM-10 channel at 31%. The slope was stable with good vegetation. A freshly- <br />installed TRM has been installed in the PM-10 channel which should address any erosion <br />concerns, and we noticed grass growing in the shallow rills on the water shed. We measured a <br />45-foot channel segment of over-steepened slope on the lower end of the solid waste area at <br />23%. Mr. Mathews noted that this was probably okay, but TRM performance should be <br />monitored by the permittee. The road ditch channel appeared to be stable and vegetation was <br />growing; in the bottom of the channel. <br />The PM:-12A channel, which controls runoff from the road, did not appear to present any long- <br />term problems. We observed rilled access to the upper PM-12 channel where a 16% slope was <br />measures. This area needs to be roughened or have water bars installed for stabilization <br />purposes. We also measured a representative slope in the upper segment of the PM-12A channel <br />at 21 %, and a slope measurement of 14% was recorded for the upper middle segment of the <br />channel. Both segments have been stabilized with TRM and are well vegetated. Vegetation <br />(yellow clover) was coming in better in the lower segment of the channel where a slope <br />measurement of 18% was recorded. Although stable, the lower-most segment curves north <br />rather than south and a design revision is needed. <br />We walked the embankments for Ponds 2 (final pit impoundment) and 4 and determined that <br />they were stable. The water discharging on the other side of both embankments was clear. <br />We held a close out meeting July 14`h and Mr. Mathews did a thorough job of describing our <br />observations and the problem areas noted above that need to be repaired prior to DRMS issuing a <br />proposed Phase I bond release decision. Generally, the channels have been overbuilt so they are <br />acceptable, and the recently repaired areas will need to be monitored. We emphasized that the <br />scouring issues noted above for the 50-foot segment of the PM-8 channel between the "V-3 and <br />4 ditchers" and the lower 30-foot segment of the "V-3 ditch" that empties into the PM-8 channel <br />need to be addressed by conducting additional grading and stabilization work/repair prior to <br />DRMS issuing a proposed Phase I bond release decision. We also determined that several <br />locations warranted additional monitoring. Specifically, some stabilization work is required for <br />most of the "V-ditches" due to scarce vegetation. In addition, the permittee should monitor the
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