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2023-05-17_PERMIT FILE - M2021052
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2023-05-17_PERMIT FILE - M2021052
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Last modified
5/18/2023 8:40:33 PM
Creation date
5/18/2023 8:36:47 AM
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Template:
DRMS Permit Index
Permit No
M2021052
IBM Index Class Name
Permit File
Doc Date
5/17/2023
Doc Name
Adequacy Review Response
From
IHC Scott
To
DRMS
Email Name
ACY
THM
Media Type
D
Archive
No
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purpose,however specific to this comment,this berm will keep all stormwater,dust control water and <br /> wash water on-site, essentially providing a zero discharge of water or sediment-laden water off-site. <br /> The following statement was added under Section 5.2.3.3 to address this comment, "The perimeter <br /> berm,installed during Phase 1, will keep all on-site activities during Phase 3 including,but not limited <br /> to stormwater,process wash water, dust-control,and aggregate dewatering. This perimeter berm will <br /> essentially provide a zero discharge of water or sediment-laden water off-site." <br /> 30. Section 5.2.3.1 states"pit slopes to the bottom of pond will be approximately 3:1; not to exceed <br /> 2:1". Pursuant to Rule 3.1.5(7)slopes shall be no steeper than a 3H: 1V, 5 feet above the water <br /> and 10 feet below the expected water line. Please revise the sloping to only allow 314: 1V slopes <br /> for the first 10 feet below the expected water line. Slopes below 10 feet of the expected water <br /> line may be a 2H: 1V. Update all other applicable exhibits and figures as necessary. <br /> Figures 9 and 10,Exhibits C4 and C5 have been updated to reflect a maximum slope of 3H:1V within 10 <br /> feet of the expected water line.See Note#1 and Details on these Exhibits. The narrative in Section <br /> 5.2.3.1 has been updated to reflect the recommended language. <br /> 31. Section 5.2.8 states"Reclamation will proceed in concert with excavation." If excavated areas <br /> are inundated, how will the Operator ensure that slopes are reclaimed to the proper grade if <br /> they cannot be visually inspected, per Rule 3.1.5(7)? Ensuring proper sloping of mine highwalls <br /> shall also be discussed under Exhibit E-Reclamation Plan. <br /> The narrative in Section 5.2.3.1 has been revised to delete references to reclamation proceeding in <br /> concert with excavation. The perimeter berm will be revegetated during Phase 1 and the remaining <br /> reclamation activities will occur during Phase 4. <br /> The wetland reclamation slope of 5:1 is visually apparent due to the shallow water covering the <br /> fringe. The deeper slopes will be maintained at no steeper than 3:1. During mining operations,Scott <br /> will utilize the GPS receiver in the excavator to see the excavated profile and make sure that the <br /> requirements of the permit are being met, including the 3:1 maximum slope.Scott will also use a <br /> handheld rover and check the slopes as we excavate to insure that all requirements of the mining <br /> permit are being met,including the 3:1 maximum slope. <br /> 6.4.5 EXHIBIT E-Reclamation Plan <br /> 32. Section 6.0 states that all temporary structures will be removed.Will any permanent features be <br /> installed and thus left post mining? <br /> The Operations Pad area will remain post-mining and be used to store equipment. <br /> 33. Section 6.1 states"^'12.56 acres of pond will be present post-mining"while Figure 14, Exhibit E1 <br /> and Figure 15, Exhibit E2 state that water surface area will only be 9.55 ac+/-0.7 ac. Please <br /> explain this difference or update accordingly so that information is consistently presented <br /> throughout the application. <br /> Previous DRMS applications included a 12.56-acre pond post-mining. The updated pond size is now <br /> 9.55 acres and was reduced to include a 35 foot wetland buffer per the Garfield County Land Use <br /> Permit conditions.Section 8.7 provides updated project water requirements associated with this <br /> revision and the reduced pond size. The Substitute Water Supply Plan submitted to the SEO in June <br /> 2022 included the 12.56-acre pond for augmentation purposes and conservative for the current pond <br /> 6 <br />
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