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2024-08-02_REVISION - M1992051
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2024-08-02_REVISION - M1992051
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Last modified
8/5/2024 8:56:18 AM
Creation date
8/5/2024 8:49:43 AM
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Template:
DRMS Permit Index
Permit No
M1992051
IBM Index Class Name
Revision
Doc Date
8/2/2024
Doc Name
Request for Technical Revision
From
Langston Concrete Inc
To
DRMS
Type & Sequence
TR3
Email Name
JLC
AME
EL1
Media Type
D
Archive
No
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T <br /> LAN sTON <br /> CONCRETE INC. <br /> from other locations for fill. A dozer should be able to support itself and have the pond filled in <br /> approximately two days or less. <br /> To calculate the cost of this operation, we referred to data provided to us from 2016 in our <br /> Technical Revision#1. In 2016, the operating cost of a D-8 dozer was $169.91/hr. We do not <br /> know what the current operating costs is today, but used a 10% inflation increase and came up <br /> with $186.90/hr. The average push distance is approximately 50'. And the material consistency <br /> is the same as well as the unit weight. Therefore- 16hrs. x $186.90 = $2,990.40 to complete the <br /> operation. A mobilization fee can be assessed at $1,000.00. For a total of$3,990.40 as a <br /> reclamation cost. <br /> In the closest location to the wash plant, we will create the initial discharge into the pond off the <br /> wash plant. This area will generate all of the reject off the wash plant and will be where we <br /> "clean" out the pond on a regular basis. The earthen material will be pulled from the pond with <br /> an excavator and hauled to the existing reclamation areas within the property via haul truck. Here <br /> the material will have the opportunity to fully dry out. We are not planning on using any <br /> flocculants of any kind. <br /> Taking the existing reclamation plan into consideration, we intend to keep all the reject material <br /> within the confinements of the existing disturbed area. At the moment, there is a hole in the <br /> North East corner of the gravel pit we intend to begin discarding waste material from the wash <br /> plant. The material will be discarded here for a short period of time. We are currently mining <br /> from the East to the West. At our face, we have met our Northern border and are working on <br /> getting the material harvested at the time of this document. We intend to have the marketable <br /> rock out of the area in the next couple of months. Once we have the area cleared out, we intend <br /> to start discarding the waste material from the wash plant here. The space is larger and will give <br /> us the opportunity to have plenty of room to store the material as it dries out. As soon as it is <br /> manageable, we will use it as backfill in the areas needing reclamation around the pit. The <br /> primary areas are in the slopes surrounding the pit floor. <br /> In regard to the amount of material previously allocated for reclamation purposes, we are going <br /> to be cutting into the amount set aside, but still have more than enough to completely reclaim the <br /> property; and then some. There are a couple different ways to calculate the amount of <br /> reclamation material we are going to need for the property. And a couple of different ways to <br /> calculate what we have left. The simplest way, in our opinion, is to look at it as a whole. Using <br /> rough numbers, we have approximately 48 acres left to mine. Of that 48 acres, our highwall is <br /> approximately 40 feet high. When you calculate the cubic yard volume on that area, we get <br /> 3,097,600cy of material. If you break down the same 40 feet we have approximately 25 feet of <br /> overburden or"waste material." Which leaves approximately 15 feet of marketable product. <br /> From a simple perspective, we have 1,936,000cy of overburden/waste material and 1,161,600cy <br /> of marketable material. Which leaves 774,400cy of excess overburden material. <br /> To further investigate what is needed for reclamation, we calculated the bare minimum needed <br /> for following the existing reclamation plan. If we calculate just enough to backfill the highwalls <br /> along the perimeter with a 2:1 slope and the 12 inches of pit run in the quarry floor, we come up <br /> 902 South Union Street Florence, Co. 81226 (719) 784-3878 Office (719) 784-1158 Fax <br />
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