2024-11-22_REVISION - M1999120 ‎(4)‎

• Permit No: M1999120
• IBM Index Class Name: Revision
• Doc Date: 11/22/2024
• Doc Name: Request For Amendment To Permit
• From: L.G Everist, Incorporated
• To: DRMS
• Type & Sequence: AM3
• Email Name: NCG
• Email Name: JLE
• Email Name: EL1
• Media Type: D
• Archive: No

MINING PLAN EXHIBIT D (CCNT)
unknown at this time, so we have shown the approximate location on
EXHIBIT C-1 -MINE PLAN MAPS.
Mining within each phase will begin once topsoil and overbur-
den has been removed from that phase area. Excavated materials
(pit run) will be removed via front-end loaders, or excavators and
may be loaded onto a field conveyor and transported back to the
processing plant, or loaded into off-road haul trucks for trans-
port to the plant site. Mined slopes will range from near verti-
cal to 0.5: 1, or as required by the Slope Stability Analysis and
Setback Agreements (see EXHIBITS-STRUCTURES from the 2004 submittal
(included in this packet) .
As soon as mining limits have been reached in one phase area,
reclamation of the pit edges within that phase area will begin.
This will allow for concurrent backfilling of the pit perimeter
with previously stripped overburden and/or material stripped from
the next phase area to be mined. Access roads built during slurry
wall construction and mining will be left as access roads around
the reservoirs or for access to oil and gas wells on the site.
Slurry walls have been installed around Swingle North,
Swingle South, Ft. Lupton West, Parker-Panowicz and the Blue
Ribbon Phases. Testing is complete and certified for all but Blue
Ribbon and Swingle South. A slurry wall is planned for the small
lake on the north end of Sandstead. We anticipate slurry wall
construction will begin soon after permit approval on the North-
east Phases.
River setback and Bank armoring
The only place the South Platte River is within 400 feet of
the mining area is along the east sides of Northeast Phases #1 &
#3 in the amendment area. Along this stretch the slurry wall will
be installed at least 200 feet from the edge of the river. The
mining setback will be 275 feet where the finished top of the
slope and armoring will start.
No more than 1, 700 feet of :1 cut/fill sloping and 2,000
feet of i:1 backfill sloping in any one phase will be needed and
no more then 2000 feet will need armoring. Armoring will be done,
using the technique, and materials described in the BANK ARMORING
PLAN in the APPENDIX of this application packet.
Water Diversions and Impoundments
The entire site will be graded in phases to direct storm-
water runoff towards interior ditches and dewatering systems. A
CDPS permit for the existing mine operations is in place from the
Colorado Department of Public Health and Environment (CDPHE) for
the current dewatering operations. This permit will be modified,
if necessary, to accommodate the additional parcels.
As the slurry walls are installed, they will be constructed
around the perimeter of each new phase prior to commencement of
mining. This will seal off each individual phase area, and
preventing infiltration of groundwater into the mining area. Once
the initial groundwater quantities within each mine area are
pumped out, continued dewatering will not be required except on an
as-needed basis after significant weather events.
L.G. Everist, Inc. M-1999-120
Ft.Lupton Sand and Gravel November,2024
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