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INSPEC05477
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INSPEC05477
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Entry Properties
Last modified
8/24/2016 9:00:40 PM
Creation date
11/18/2007 8:22:04 AM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1981015
IBM Index Class Name
Inspection
Doc Name
INSPECTION REPORT
Inspection Date
12/31/1996
Media Type
D
Archive
No
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S <br />the bench to sandstone ledges above. The landowner has requested <br />that the #1 Mine bench and access road to the bench remain in their <br />present configuration. <br />There are no signs of seeps, instability, or excessive erosion <br />associated with any of the backfilled portal locations. The #1 <br />portal backfill had slumped following initial backfilling, <br />apparently due to insufficient compaction of backfill within the <br />portal. Remediation work was performed in early 1994, and appears <br />to have been successful. Vegetation cover is still somewhat sparse <br />on the portal backfill, and there is some minor rill erosion <br />present. The #2 Mine area consisted of an upper bench where the <br />portals were located, and a lower bench where the coal pad area was <br />located. Both benches have been eliminated, and the regraded <br />slopes extend to the base of natural sandstone outcrops at their <br />crest. Vegetation is somewhat sparse, but there is no sign of <br />instability or erosion on the backfilled slopes. <br />Several gullies had developed on the steep excess spoil outslope <br />below the #1 Mine bench, but these gullies were eliminated by <br />grading and contour furrowing performed by a DMG reclamation <br />contractor in March, 1996. Stability analyses prepared by American <br />Shield Coal Company in 1992 demonstrated the long term engineering <br />stability of the fill, and there are no signs of seeps, slumps, <br />cracking, or other indications of instability on the fill. <br />There are no coal waste piles at the site, however a small coal <br />stockpile which had existed at the site was buried, and covered <br />with four feet of fill, in the southeast corner of the disturbed <br />area. The coal stockpile area was reclaimed at the same time as <br />the Fruita #2 portal area and coal pad area and associated roads, <br />along with a small sediment pond and two small topsoil stockpiles <br />also located in the southeast corner of the disturbed area. <br />c) One impoundment still exists at the site, the large sediment <br />pond which controls runoff from the entire disturbed area, with the <br />exception of approximately 1/2 acre of disturbance in the vicinity <br />of the reclaimed sediment pond and former topsoil stockpile <br />location. The total area that drains to the pond is 79.6 acres, of <br />which approximately 11 acres was disturbed by the Fruita Mines. <br />The pond has a gated 4" PVC primary spillway which is mounted and <br />braced inside a 30" CMP emergency spillway. The gated primary <br />spillway is located approximately 2 feet above the bottom of the <br />pond, with an 8 foot riser section on the emergency spillway <br />providing a total pond volume of approximately 7.4 acre feet. The <br />pond is designed to contain, and the emergency spillway is designed <br />to safely convey the flow from a 25 year/24 hour precipitation <br />event. The pond embankment forms a segment of the mine access <br />road, and the landowner has requested that the embankment, and <br />road, remain in place to allow for future vehicle access to the #1 <br />Mine bench. Wheh sediment control for the site is no longer <br />
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