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PERMFILE106665
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PERMFILE106665
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Last modified
8/24/2016 9:59:19 PM
Creation date
11/24/2007 2:04:36 PM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
M2004047
IBM Index Class Name
Permit File
Doc Date
7/25/2004
Doc Name
New 112c Appl
From
Farfrumwurkin LLLP
To
DMG
Media Type
D
Archive
No
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6.4.5 Exhibit E -Reclamation Plan <br />• 6.4.5.1 RECLAMATION SUMMARY <br />Reclamation of the pits will occur concurrently with mining. The reclamation plan <br />proposes to line a portion of the mining excavation with compacted inorganic clay <br />material to create a relatively impervious layer, preventing seepage through the <br />sides of the excavation. The reclaimed West Pit will then be used as 2 separate <br />water storage areas. The largest of the two water storage areas, the South <br />Reservoir, will encompass roughly 60 acres while the North Pond will be <br />approximately 6 acres in areal extent when finished. Reclamation will follow the <br />sequence outlined below beginning in Area A and finishing with the mining and <br />reclamation of Area K in the West Pit and the west to east mining of the East Pit. <br />Side slopes of the South Reservoir will be graded at 2H:1 V below natural grade <br />leaving the 60-acre pond area occupying the proposed mine pit area. Wide <br />berms extending above the existing ground elevation will be constructed from <br />overburden and will raise the top of pond elevation to 4955. The side slopes of <br />the berm above natural grade will be 3H:1 V. Over-excavation of the bottom of <br />the South Reservoir will be required to extract borrow material used to construct <br />the ponds above existing grade and balance the cut/fill for the project. <br />The top width of the berm varies over its total length from approximately 368-feet <br />on the east side of the reservoir, to 30-feet wide on the north, to roughly 250-feet <br />on the northwest edge of the proposed reservoir, to 30-feet wide at the southeast <br />• corner of the reservoir where the berm height tapers to approximately 2 feet. <br />Stockpiled topsoil will be placed on the berm and outer side slopes to a depth of <br />0.25 to 0.5 ft. The clay-lined portion of the pond will not receive application of <br />topsoil material. <br />The vertical extent of the berm above natural grade will impound more than 100 <br />acre-ft of water in the South Reservoir and therefore could be determined a <br />jurisdictional dam. Preliminary indications from the state engineers office <br />indicate that the width of the berm may result in anon-jurisdictional <br />determination. Engineering drawings of the berm will be submitted to the state <br />engineers office for an official jurisdictional determination. A liner design will also <br />be submitted to the state engineers office for approval. <br />6.4.5.2 WEST PIT <br />Reclamation will follow the same path as the mining. The outer edges of the pit <br />will be mined first, which will free up these areas for the construction of adequate <br />sideslopes and clay lining. After the outer edge of this pit has been mined, the <br />remaining center block of sand and gravel will be mined. Reclamation of the <br />center block will follow the mining operation in a similar fashion. <br />After the northern portion (North Pond) of the west pit is mined, operations will <br />move to the southern portion (South Reservoir) of the west pit. Overburden <br /> <br />File Pit 112 DMG Permif Application <br />Page 5 of 27 <br />
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