2019-08-29_PERMIT FILE - M2019028 ‎(3)‎

• Permit No: M2019028
• IBM Index Class Name: PERMIT FILE
• Doc Date: 8/29/2019
• Doc Name: Adequacy Review Response
• From: J&T Consulting
• To: DRMS
• Email Name: AME
• Media Type: D
• Archive: No

EXHIBIT E
Reclamation Plan
Lined water storage reservoirs will be the final reclaimed use for the DPG Mining site. Portions
of mining areas will be reclaimed as "native" areas, which will be re-seeded with native
vegetation. The majority of the mining areas will be reclaimed as water storage reservoirs. The
remaining area within the proposed permit boundary will consist of reservoir shoreline,
unimproved access roads around the reservoirs, and reclaimed vegetated land.
Final Land Use Reclamation
Plan Area
acres
Reservoir Water Surface 176.80
Access Roads 21.56
Reclaimed Vegetated Land (Disturbed Land 29.16
and Slopes above Reservoir Water Surface
TOTAL 227.52
Water Storage Reservoir
In general, the mining limits will be mined down to the shale/claystone/sandstone bedrock. The
relatively impermeable bedrock will make the bottom of the reservoir. The reservoir will be
separated from the surrounding alluvial aquifer by the slurry wall liner system as detailed in the
cross-section shown on the Reclamation Plan Map. The slurry wall liner will be keyed into the
bedrock material and extend upward through the entire height of the alluvium. Design
specifications and quality control procedures used during the construction of the slurry wall liner
will ensure that the reservoir meets the State Engineer's Office (SEO) performance standards
for permeability. The slurry wall is anticipated to be installed around the perimeter of Phase 1
and 2 after a depth of 30 feet is reached in Phase 1 and prior to starting mining in Phase 2 and
it is expected minimal dewatering will be required in the subsequent phases due to the slurry
wall cutting off groundwater infiltration into the pit.
All reservoir slopes will be reclaimed to at least 3H:1V final grade Since reclamation will be
concurrent with mining, most soil, overburden, and bedrock material excavated during mining
will be used almost immediately. Scrapers and dozers and compactors will be used to shape the
reclaimed slope material along the reservoir perimeters to achieve the final grade. Upon placing
the backfill material, 95 percent compaction will be achieved to ensure adequate integrity of
backfilled areas for haul/access roads and recharge pond areas that are not within the future
water storage/reservoir footprint. Final reclamation by capping with topsoil and re-vegetating
above the expected reservoir water level will follow grading operations as well as backfilled
areas that will not be haul/access roads to minimize the amount of disturbance at any one time.
Recommendations for monitoring of slope stability, including, conducting a visual inspection of
the excavated slopes on a weekly basis for the duration of mining, conducting a visual
inspection after a major precipitation event that has saturated the ground using the same
procedures, contacting qualified personnel to evaluate and recommend remediation work to
stabilize the area in the event a visual inspection detects signs of potential slope failure, and if
• JET Consulting,Inc. J-2 Contracting Company
DPG Mining Site
DRMS 112 Permit Application