2012-02-24_REVISION - M1999120 ‎(7)‎

• Permit No: M1999120
• IBM Index Class Name: REVISION
• Doc Date: 2/24/2012
• Doc Name: Submittal
• From: L.G. Everist, Inc. and Environment, Inc.
• To: DRMS
• Type & Sequence: AM2
• Media Type: D
• Archive: No

MINING PLAN EXHIBIT D (CONT)
the Fort Lupton East, Hill /Oakley, Fort Lupton West, and the
Meadows North & South Stages. Reservoir certification is done on
Hill /Oakley, Fort Lupton East and Fort Lupton West stages.
Please see the Mining Plan Map in the 2004 amendment for the
location of these stages. Sloping and grading is done on Fort
Lupton East and Hill /Oakley and a Technical Revision was filed to
remove an oil well that has been shut in and no longer exists in
that Phase.
Slurry walls have been installed around Meadows North,
Meadows South, Meadows West, Swingle North, and Parker - Panowicz
Stages, but testing has not begun on them at this time. We
anticipate slurry wall construction will begin this spring or
summer on the Swingle South and Vincent West Stages. The appli-
cant asks the Division to include bonding calculations for the
newly installed slurry walls in this amendment.
The Parker - Panowicz stage is already bonded for surface
disturbance, and has the recycling areas located on it. Mining
for road base materials has recently begun in this stage as well.
The applicant asks the Division to include full disturbance of
this stage in bonding calculations for this amendment.
Water Diversions and Impoundments
The entire site will be graded in phases to direct storm -
water runoff towards interior ditches and dewatering systems.
CDPS permits for the existing mine operations have already been
obtained from the Colorado Department of Public Health and
Environment (CDPHE) for the current dewatering operations. These
permits 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 mine area prior to commencement
of mining. This will seal off each individual phase area,
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.
Description of Overburden, Deposit and Underlying Stratum
Across the entire amendment area, approximately 3 feet of
overburden (including approximately 6 to 18 inches of topsoil)
will be removed from the mine areas and stockpiled for plant -
growth material in surface reclamation or used as backfill for
the pit slopes. An average thickness of approximately 33 feet of
sand and gravel exists across the amendment area.
Mining Timetable
The continuing uncertainty of economic conditions in the
construction materials industry precludes an accurate forecast of
demand for materials during the life of the mine. We therefore,
can only estimate the mining timetable based on an average year
and may expect a specific year to vary widely from the average.
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