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2019-09-18_REVISION - M2004044
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2019-09-18_REVISION - M2004044
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Last modified
1/6/2025 3:57:54 AM
Creation date
9/18/2019 4:53:48 PM
Metadata
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Template:
DRMS Permit Index
Permit No
M2004044
IBM Index Class Name
Revision
Doc Date
9/18/2019
Doc Name
Adequacy Review Response #2
From
Aggregate Industries
To
DRMS
Type & Sequence
AM1
Email Name
JLE
Media Type
D
Archive
No
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Phase 1 will be mined using excavators,transport trucks, and active dewatering during mining. Topsoil will <br /> be stripped and stockpiled in locations shown on the Exhibit C Mining Maps. Material will be excavated and <br /> transferred to transport vehicles and transported via the approved haul route to the Wattenberg Lakes Mine <br /> (M-2004-051). <br /> • The slurry wall liner for the West and East Areas will likely be installed concurrent with mining in the South <br /> Area. Once the slurry wall is installed the West and East Areas will be dewatered. The deposit will be dry <br /> mined using dewatering trenches and pumps within the slurry lined area. Prior to excavation of each mining <br /> phase,trenches will be cut along the perimeter of the excavation to begin dewatering the sand and gravel <br /> material. The trenches will extend through the overburden and alluvium to bedrock. Pumps will be used to <br /> remove the groundwater that drains from the deposit within the lined excavation. If necessary,water from <br /> the trenches will be circulated through a settling pond prior to being discharged to adjacent drainage ditches <br /> and/or the South Platte River(see Exhibit C Mining Maps). As excavation begins,the mining cell and <br /> dewatering trenches on the floor will continue to collect any water entering the lined Areas, keeping the <br /> deposit material relatively dry. The collected water will be directed to settling ponds within the Areas or near <br /> the final discharge point to South Platte River. It is anticipated that dewatering will be completed within the <br /> slurry wall lined mining area within 12 months and dewatering throughout the life of the mine will be limited <br /> to precipitation,stormwater runoff that drains into the mining area,and minor amounts of groundwater. <br /> Earth Movinq <br /> Setbacks from the top of slope of each area to the proposed permit boundary or man-made structures not owned by <br /> the applicant or by agreement with the structure owner will generally be 30 feet or greater. Specific setbacks from <br /> Highway 7 and Tucson Street also account for future expansion of the roadways. The perimeter setbacks from the <br /> structures are shown on Exhibit C-Mining Maps. <br /> These setbacks were determined in combination with Adams County regulations and the Slope Stability Analysis <br /> prepared by Tetra Tech provided herein in the Geotechnical Stability Exhibit. The setbacks reflect the Factors of <br /> Safety in the Proposed Slope Stability/Geotechnical Analysis Policy in the DRMS memorandum dated May 16,2018. <br /> Areas to be mined will be prepared by removal of topsoil and overburden. Each preparation area may be as much as <br /> 100 feet wide along the anticipated mining face. Usually,only enough area is stripped and prepared to provide the <br /> estimated needs for the next 10 to 14 months of mining. Surface topsoil material will be stripped separate from the <br /> underlying,deeper subsoil or overburden material. This topsoil layer contains most of the soils organic matter and <br /> will be stockpiled separately for use in reclamation. Once the topsoil has been removed,the rest of the overburden <br /> will be stripped and stockpiled separate from the topsoil. <br /> When the alluvial material is exposed and sufficiently dewatered,the aggregate material will be recovered using <br /> equipment typical for sand and gravel mining operations. In the South, West and East Areas,the aggregates will be <br /> mined using conventional dry mining methods, Earth moving equipment may include, but is not limited to, dozers, <br /> loaders,scrapers,and excavators as mining progresses to a depth of 20 to 50 feet below the surface. The alluvial <br /> material is an unconsolidated deposit and,therefore, no blasting is required. The aggregate material from the Areas <br /> will be temporarily stockpiled within the various Areas,conveyed to the staging area,or immediately transported off- <br /> site for processing. During mining and reclamation activities,watering trucks for dust control will be used as needed, <br /> The active mining face will extend no more than 1,500 feet in length. During mining in the South Area,the mine walls <br /> will beat or near the angle of repose,approximately 2H:1V. During mining and prior to reclamation in the West and <br /> East Areas,the mine walls will be a nearly vertical to Y2H:1 V slope(see Exhibit C, Mining Maps). Mining will <br /> progress down to the depth of quality aggregate material. Backfilling and/or grading of side slopes may follow behind <br /> Aggregate Industries Tucson South Resource <br /> Permit#M-2004-044112 Permit Amendment <br /> Page D-4 <br />
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