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2020-06-23_REVISION - M2018037 (4)
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2020-06-23_REVISION - M2018037 (4)
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Last modified
1/8/2025 2:12:13 AM
Creation date
6/24/2020 9:33:21 AM
Metadata
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Template:
DRMS Permit Index
Permit No
M2018037
IBM Index Class Name
REVISION
Doc Date
6/23/2020
Doc Name
Request For Amendment To Permit
From
BURNCO COLORADO LLC
To
DRMS
Email Name
MAC
ECS
JXT
Media Type
D
Archive
No
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Phase 4: This phase will consist of the western cell which will subdivided into cell 4a <br /> and 4b and will take approximately 7 years to mine and 2 years to reclaim. <br /> Reclamation will begin immediately after mining is complete. When possible, <br /> concurrent reclamation practices will be used to minimize site disturbance and to limit <br /> material handling to the greatest extent possible. Please refer to the Mining Plan Map <br /> in Exhibit C for phase areas to be mined, locations and areas. The table below <br /> summarizes the approximate quantities in the mining areas. <br /> Mining Phase Gravel Overburden Time <br /> (tons) (tons) (yrs) <br /> 1 1,200,000 148,000 2.4 <br /> 2 2,000,000 80,000 4.0 <br /> 3 1,700,000 242,000 3.4 <br /> 4a 1,900,000 244,000 3.8 <br /> 4b 1,600,000 197,000 3.2 <br /> Total 8,400,000 911,000 16.8 <br /> (� Use Mining Plan Map in conjunction with narrative to present: <br /> (i.) Nature, depth and thickness of the deposit and thickness and type of <br /> overburden to be removed <br /> Exploratory borings drilled (December, 2017 and August, 2019) primarily along the <br /> perimeter of the site, encountered approximately two to twelve feet of overburden <br /> topsoil, silty sands, sandy lean clays, fill overlying approximately 22 top 47 feet of <br /> sand and gravel on top of primarily claystone bedrock. Refer to the Stability <br /> Analysis (Exhibit S) for locations of the property extents and boring locations. The <br /> bedrock depths in the proposed mine areas ranged from approximately 25 feet to <br /> 54 feet below the ground surface. <br /> (n Nature of the stratum immediately beneath the material to be mined in <br /> sedimentary deposits <br /> The site is located approximately 20 miles east of the foothills of the Colorado <br /> Front Range on the western flank of the Denver Structural Basin. The basin is a <br /> downwarp of sedimentary strata that tends north-northwest, parallel to the <br /> mountain front. In the project area, the sedimentary bed dips gently eastward <br /> toward the axis of the basin east of the site. Based on regional geologic mapping <br /> (Colton, 1978), the near surface bedrock in the project area is the Paleocene and <br /> Upper Cretaceous Denver and Arapahoe Formations. The bedrock is overlain by <br /> upper Pleistocene and Holocene (Quarternary age) gravel deposits and eolian <br /> (wind blown) overburden soils. The gravel deposits exist primarily within the Piney <br /> Creek Alluvium deposit. The bedrock unit consists mainly of claystone and may <br /> contain lenses of siltstone and sandstone. <br /> Inouye Gravel Mine-City of Fort Lupton,WWTP-MLRB 112 Permit Amendment <br /> Exhibit D-3 <br />
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