20220407_Mine_Map

Pipe Outlet to Flat Area —
No Well-defined Channel
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Notes
1. La is the length of the riprap
apron.
2. d=1.5 times the maximum
stone diameter but not less
than 6".
3. In a well-defined channel ex-
tend the apron up the channel
banks to an elevation of 6"
above the maximum tailwater
depth or to the top of the bank,
whichever is less.
4. A filter blanket or filter fabric
should be installed between
the riprap and soil foundation.
La
—uprs III ids p I
till III i Sectjon AA = I _�;' lot,
Filter
blanket
Figure 6.4% eiprap w0eo praedlon (modified from Va SWCC,
DISLHAi24E OUTLE1 TROTcL'/10N JXTA1L.
2 3"
coarse aggregate
Figure 6.06a Gravel ealMnoelexit keeps sediment train leaving the a0a6itudtian site (modified from Va SWCC).
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Cross -Section
View
Filter
Steel fabric 6ackhIl trench
Natural
post and compact
)horoughly
ground
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. mm •
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a"
min
24"
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Figure 6.62a Instailation detail of a sediment fence.
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Development and Operation Plan
Gravel Construction Entrances will be established as shown on mine plan.
Grading will begin in "Initial Mining Area" adjacent to the "Plant and
Process Area". This initial excavation will serve as sediment and erosion
control for establishment of the plant and processing area. All runoff from
the plant and processing area will be directed into this excavation and
retained without discharge. After the processing plant is established,
water from this excavation will be utilized as recycled wash water and for
dust suppression. Mining will then progress to the mining area south of
the plant and processing area. These two mining areas will serve as
sediment and erosion control for the plant and processing area for the life
of the mine. Mining will then progress to the other designated mining
areas as the need arises. In each area, the initial excavation will serve as
the sediment and erosion control structure. Since the topography is
generally flat -lying along the perimeter of the mining areas, silt fence will
be utilized to prevent sediment from leaving the mining area during initial
clearing. Stormwater will be retained within the mining area, and either
used in processing / dust suppression or discharged at the designated
point
Sediment and Erosion Control
(S� p�xr I\ ��° may♦ The mining areas will serve as the primary sediment and erosion control feature. After the
Gravel Construction Entrances are established, excavation will begin in the initial mining
1 / areas just north and south of the Plant and Stockpile Area. Diversion berms will
\�EilAt�il Ir ` V l / established just outside the 50-foot undisturbed buffer of the wetlands, and around the
1�ovsC perimeter of the mining area This will prevent an sediment from leav' th d' t b d
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area and entering the wetland area. The Visual Barrier Berms (as required by the County)
will be established outside of the 50-foot undisturbed buffer along the property line,
thereby preventing any sediment from leaving the permitted area. The Haul Roads and
Plant and Stockpile Area will then be cleared and graded to drain into the Mining Area
C RcYRL1E excavations. The perimeter berms adjacent to the Haul Roads and Plant and Stockpile
Diow 15 Area will be "notched" at approximately 200-foot intervals to allow runoff to pass from
these areas into the mining area. The openings will be backfilled with rip -rap and #57
stone to prevent erosion. Runoff will be held within the Mining Areas until pumped out
All Haul Roads will be graded to direct runoff back into the mining areas. Once the initial
Mining Areas and Plant and Stockpile Areas are established, all future land disturbance
will be a continuation of this process, with all runoff remaining within the mining area.
When moving into a new mining area, an initial area of excavation will be established with
ti a perimeter berm or silt fence to prevent any sediment from leaving the disturbed area /
' �0o mining area. As mining progresses, all runoff will remain within the mining area.
C� No discharge of any water will be necessary in the early stages of this operation. Any
water collected within the Mining Area will be utilized for dust suppression or in the
washing process. After the Mining Area has expanded to a large enough size, some
occasional discharge may be necessary. At that time, a temporary 30'x60' basin will
constructed within the mining area. Any water pumped from active mining areas will pass
through this basin before discharge. After mining is completed in the area of the
discharge point, then the mining area will fill with water, and any discharge form other
mining areas will pass through the large pond before discharge.
Reclamation Plan
2,0110E L) u s 410 All mining areas on this site will be left as a lake. As the excavation
Dew fvl5 fiaizRl5 reaches the final mining limits, the slopes will be graded to a 3:1 slope. All
v disturbed areas that remain above water will be graded to a 3:1 slope or
tti flatter and seeded according to schedule to prevent erosion. Perimeter
berms will be removed and graded. The plant and processing area will also
be graded and seeded to prevent erosion. Any haul roads will be stabilized
February 2022 Modification to prevent erosion and left for access to the property.
This minor modification adds 2.4 acres of Mining Area within a previously permitted area. No
new acreage is being added to the permitted area. Wetlands in this area were delineated by -
Wyatt Brown, Brown Environmental Group, and subsequently approved by the US Army Corps
of Engineers. As elsewhere on this site, a 50 foot undisturbed buffer will be maintained
between wetlands and any land disturbance. Silt fence will be established around the perimeter
of the new mining area prior to any land disturbance. All runoff will be directed into the
excavation, and there will be no discharge of stormwater. Any water collected within the new
mining area will be pumped as needed to the existing mining area via pipe. The new mining
area is accessed by an existing farm path via Stokes Road. Reclamation of the site will be in
accordance to existing reclamation plan and permit requirements. American Materials Company, LLC
Dupree Pit, Permit #74-90
Affected acreage: Pitt County, NC MM Bti
(;qRo LlN4 '(�OLUC♦ltAi
Mining area: 85.78 acres Wastepiles (berms): 4 acres Permit Modification Requests`Rv)`� • INt
Processing areas/roads: 4 acres -Revised TDTWL_ �eTtgacb
4 /-7 / Zz 1"=200' February 5, 2022
Total permitted acreage: 280 acres