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2025-04-22_REVISION - M1979045
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2025-04-22_REVISION - M1979045
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Last modified
4/23/2025 8:14:35 AM
Creation date
4/23/2025 7:52:05 AM
Metadata
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Template:
DRMS Permit Index
Permit No
M1979045
IBM Index Class Name
Revision
Doc Date
4/22/2025
Doc Name
Request For Amendment To Permit
From
Environment, Inc.
To
DRMS
Type & Sequence
AM2
Email Name
BEH
ZTT
EL1
Media Type
D
Archive
No
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EXHIBIT E RECLAMATION PLAN(con() <br /> the side slopes is available on site and, because of the high <br /> clay content, it is suitable for constructing a compacted liner. <br /> From the west side of the Church Pit to the east side of the <br /> Rocky Flats Pit, there exists a decrease in elevation of <br /> approximately 90 feet . The maximum final elevation of the <br /> reservoir and, thus, its storage capacity is limited by the <br /> maximum reservoir elevation on the east edge of the Rocky Flats <br /> Pit . This scenario is shown on Exhibit F— Reclamation Plan Map. <br /> However, as the reservoir is planned and designed, the addition <br /> of dividers that can increase the carrying capacity of the <br /> reservoir may be included. This would divide the reservoir into <br /> two or more cells in order to maximize water storage capacity. <br /> The final design of the reservoir will be dependent upon future <br /> mining progress and can only be estimated now. The revised, as- <br /> built reclamation plan will be submitted as a Technical Revision <br /> once the final configuration and slopes are known. The existing <br /> ground level around the perimeter of the future reservoir will <br /> remain at its pre-mining grade, so this will be in-ground <br /> developed water storage and not a dam. <br /> Reclamation will be carried out so that all slopes from the <br /> existing surface to the final floor elevation will be graded 3h <br /> to lv. After the slopes have been established in an area, a <br /> growth medium will be respread from the existing ground level to <br /> the estimated water level. Only sloped areas consisting of <br /> exposed sandstone will not be resoiled with this growth medium. <br /> The salvaged growth medium will be spread to a depth of 4 to 8 <br /> inches, averaging 6 inches . <br /> The SCS report estimates a uniform 18 inches of soil covers <br /> the area and it is described as brown cobbly, sandy loam that is <br /> 50% to 75% cobble. The report does not make an estimate of the <br /> percentages of fines, however, from experience it is approximated <br /> that 35% is unusable by the gravel operation. With this estimate, <br /> from the original 18 inches of soil, between 4 .5 and 8 inches is <br /> salvageable, if screened. The gravel mining also generates fines <br /> that can be used as growth medium, so it estimated that the <br /> average soil thicknesses that can be replaced is from 4 to 8 <br /> inches, averaging 6 inches. <br /> The western side of the pit is bounded by the Fox Hills <br /> sandstone, which has a dip of 45° (1 to 1) . If this Fox Hills <br /> sandstone is mined, either a 3h to lv slope of solid rock will be <br /> mined along the permit boundary or a near vertical 1. 5h to lv <br /> face will be left and then backfilled to 3h to lv. Any sandstone <br /> that is left exposed will not be resoiled. The natural sandstone <br /> will be stable and does not need revegetation. Should the <br /> sandstone not be mined, then the original plan to use onsite <br /> material to backfill along the face to leave a 3h to lv slope <br /> will be followed. <br /> Lakewood Brick and Tile CO Church Pit-M-1979-045 <br /> Amendment 02 16 April 16, 2025 <br />
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