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2022-12-22_REVISION - M1987164 (5)
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2022-12-22_REVISION - M1987164 (5)
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Entry Properties
Last modified
12/28/2022 9:38:48 AM
Creation date
12/27/2022 5:02:50 PM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
M1987164
IBM Index Class Name
Revision
Doc Date
12/22/2022
Doc Name Note
Exh D
Doc Name
Request For Amendment To Permit
From
Oldcastle SW Group, Inc. dba United Companies
To
DRMS
Type & Sequence
AM4
Email Name
HR1
MAC
AWA
Media Type
D
Archive
No
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EXHIBIT D MINING PLAN <br /> 1 . General Mining Plan <br /> The property boundary has been surveyed on site and the permit area will be surveyed prior to <br /> any additional acreage to the site disturbance. Map C-2 shows the mining plan. Mine access will <br /> remain as the current access from a private road to the south of U.S. Route 40. Internal haul <br /> roads will facilitate access to the new mining pods. Mining of the Hayden Gravel Pit will involve <br /> roughly 176.1 acres of total disturbance. The primary commodity to be mined is sand and gravel <br /> for use in construction materials such as crushed rock, sand, washed rock, concrete, and <br /> asphalt. Fill dirt may be incidentally produced during the operation. <br /> Based on exploration across the site, the average depth of overburden ranges from 11 to 20 <br /> feet, averaging at 15 feet. The top 12 inches of this overburden is assumed to be topsoil. The <br /> underlying alluvial sand and gravel deposit ranges from 17 to 26 feet with an average thickness <br /> of 23 feet. Shale bedrock is encountered at an average depth of 35 feet from the top of the <br /> natural grade. <br /> Topsoil and overburden will be stripped via dozer, scraper, or other earthmoving equipment <br /> prior to mining. These materials will be stockpiled separately on site to be used in reclamation. <br /> Any stockpile to be left in place longer than 90 days will be vegetated to prevent erosion. When <br /> possible, stripped topsoil and/or overburden will be directly placed on areas being reclaimed. <br /> Refer to Map C-2 for stockpile areas. <br /> The operation is mining Pleistocene terrace alluvium that lays atop the Lewis Shale. Mining will <br /> be to two feet above the shale bedrock. The sand and gravel deposit will be extracted using <br /> loaders, excavators, dozers, and haul trucks. Mined material will be hauled from the active pit to <br /> the processing area (Pod 1) at the west of the site. An internal haul road will be constructed to <br /> facilitate the transport of materials. Processing of the sand and gravel includes screening, <br /> washing, crushing, and the production of concrete and asphalt. <br /> All final mining slopes will be at a maximum 2H:1V slope where mining does not daylight. The <br /> active highwall will be mined at a near vertical slope until the halfway point of the final mining <br /> slope. This allows for the remaining highwall material to be knocked down by dozer to create the <br /> final 2HAV slopes. Slopes will then be backfilled to a 3H:1V slope for reclamation (Figure D-1). <br /> Refer to Maps C-2, C-3, and F-1 for the final slope configurations and cross sections. <br /> Hayden Gravel Pit <br /> December 2022 D-1 Lewicki&Associates <br />
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