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PERMFILE44539
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PERMFILE44539
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Last modified
8/24/2016 10:47:00 PM
Creation date
11/20/2007 11:57:00 AM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
M2002046
IBM Index Class Name
Permit File
Doc Date
1/28/2003
Doc Name
Amendment Preliminary Adequacy Review
From
Ephemeral Resources LLC
To
DMG
Media Type
D
Archive
No
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MINING PLAN -The permit area (104 acres) is divided into 6 sub-areas designated as Extraction Areas "A" <br />through "F". The total area designated for mining is 81 acres. Preliminary sub-surface investigations within the <br />identified mining areas revealed the nature of the gravel deposit. The average 20 foot thick sand and gravel layer <br />is in an alluvial deposit overlain with 6 feet to 12 feet of overburden. The sand and gravel is situated on top of a <br />relative flat bedrock layer of shale. <br />Mining of the raw sand and gravel will be conducted using loaders, and/or excavators. Blasting of the resource is <br />not necessary. Haul trucks will transport the resource to the process area, or to the ultimate delivery site. Each <br />phase will include a layer of sand and gravel up to 21 feet thick until the deposit reaches the underlying bedrock <br />strata. Test borings on the property have revealed that the seasonal high ground water table is approximately 10 <br />feet below the natural ground surface. Therefore, pit de-watering will be required as part of the mining efforts. <br />Water will be pumped to existing drainage ditches on the property and will be transported approximately 1000 feet <br />southwesterly to the Colorado River. Since ground water is present, an NPDES (discharge) permit will be required <br />so that the discharged water will not create adverse impacts to the river. <br />Mining of the raw sand and gravel will begin in Extraction Area "A". The first step of the process will be removal of <br />130,800 cubic yards of topsoil and overburden material. Of the 130,800 cubic yards, 37,450 cubic yards of soil will <br />be used to construct berms along the east, north and westerly perimeter of the mined area. The remaining 93,350 <br />cubic yards of overburden will be stockpiled immediately to the west of Area "A" in Area "F". The topsoil and <br />overburden will be removed to a slope of 3H:1V using scrapers, loaders and haul trucks and stored in stockpiles <br />as previously indicated. To prevent erosion, the stockpile(s) will be seeded within 12 months of their <br />establishment. All of the stockpiled overburden will ultimately be used in the reclamation process. Mining of the <br />raw sand and gravel from Area "A" will be limited to 236,840 cubic yards. Subtracting 5% for waste leaves <br />225,000 cubic yards of sand and gravel to be sold. This is approximately 50 percent of the estimated resource <br />available in Area "A". <br />Initially, the staging area will be set up in the northern half of Area "A" while the resource is being mined in the <br />southern half of Area "A". Once the specified quantity of resource is removed from Area "A", the excavation will <br />be backfilled to an elevation consistent with the northern half of "A". Once final grading is achieved, all of Area "A" <br />will then serve as a permanent staging and stockpile area for the fife of the pit. Surplus overburden material from <br />Extraction Areas "B" and "C" will be utilized to complete the grading process as described below. Approximately <br />81 acres of the permit boundary is identified for use as sand and gravel extraction activity. The maximum area <br />disturbed at any one time will be 45 acres. <br />Once the specified quantity of resource has been removed from Area "A", the stockpiled overburden will be used <br />to backfill a portion of the Area mined in "A". The mining will then proceed sequentially though the other identified <br />extraction areas. It is also expected that 5% of all mined sand and gravel will be designated as unusable and <br />therefore will not be sold. This material will also be brought back into the extraction areas to be used for backfilling <br />along with the overburden material. <br />Area "B" will generate181,591 cubic yards of topsoil, overburden and waste material. Of the 181,591 cubic yards, <br />2,560 cubic yards of topsoil and 21,111 cubic yards of overburden will be used for reclamation. This material will <br />be stockpiled in the southwest portion of Area "C". The remaining 157,920 cubic yards will be used to supplement <br />the backfilling and grading of Area "A". Mining of the raw sand and gravel from Area "B" is expected to yield <br />239,782 cubic yards. Subtracting 5% for waste leaves 227,793 cubic yards of sand and gravel to be sold. The 5% <br />waste material will also be used to grade Area "A". The sand and gravel from Area "B" as well as Areas "C" and <br />"D" will be hauled to the staging area via an existing graveled road located within the center of the proposed <br />mining areas. <br />Area "C" will generate 180,440 cubic yards of topsoil, overburden, and waste material. Of the 180,440 cubic <br />yards, 8,000 cubic yards of topsoil will be used to create a berm along the western border of the excavation and <br />23,960 cubic yards of overburden will be stockpiled in the southwest portion of Area "D" for reclamation of Area <br />"C". Of the remaining 148,480 CY of surplus material, 93,400 CY of overburden will be used to complete the <br />grading in Area "A". The remaining 55,080 cubic yards (including waste material) will be placed in the bottom of <br />the ponds for reclamation. The topsoil stockpiled in the berm, as well as all berms, will be used in the reclamation <br />of the respective areas the topsoil was removed from. Mining of the raw sand and gravel from Area "C" is <br />expected to yield 378,891 cubic yards. Subtracting 5°I° for waste leaves 359,947 cubic yards of sand and gravel <br />to be sold. <br />RevisedTanuary, 2003 <br />
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