PERMFILE126519

• Permit No: M2001001
• IBM Index Class Name: Permit File
• Doc Date: 3/21/2001
• Doc Name: CONSTRUCTION MATERIALS REGULAR 112 OPERATION RECLAMATION PERMIT APPLICATION FORM
• Media Type: D
• Archive: No

Exhibit Page 27-E
changes further downstream (such as on the Robinson and Akin properties and beyond) regardless of the Line
Camp Pit presence.
The proposed elevation of the ponds (7213.5, 7215.5, and 7218.5) is below the base Flood elevation (at about 7217
on the south end and 7225 on the north end, for the 100-year floodplain), and since land was excavated above the
proposed elevation of the ponds, the total storage capacity of the floodplain at this point is increased. The ponds are
not created by dams, but rather by excavation into the alluvial soil and deposits, and are separated by approximately
250 feet from the Dolores River. Most of the berths will be removed as part of reclamation, reducing barriers to
floodwater flow upstream even more, and thus reducing potential negative impacts both upstream and downstream.
11. Dreinage pipeline information
The drainage pipeline designed to carry return flows from irrigation near the southeast comer of the pit to the river
near the southern edge of the Truelsen property is being installed as a prerequisite of the landowner, prior to
beginning mining activities, and will also be used to allow dewatering of the pit as well as control of water levels and
discharge from the ponds following recamation, and so is listed as a permanent structure.
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DISCHARGE AREA EROSION CONTROL DEiAiL
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Return flows al Id stone water enter the concrete catch basin Pipe slope is carefully calculated on all storm sewers and other
through the fra ne and cover (grate) at the top and then flow drainage pipes, to ensure that water velocity does not exceed
out the pipe, a; shown in this USACE "Not to scale" detail. acceptable limits. When excessive water velocity or soil is
Other catch ba rins (which also serve as access for very susceptible to erosion, various techniques are used to
maintenance) ~ ire located periodically along a storm sewer, provide for outfall "armoring" including the use of chutes,
which can also accept surface water flows, especially from low riprap, geomembranes (landscaping blankets), and energy
spots that woul i otherwise hold water and damage crops. dissipaters, as shown in this USACE "Not to scale" detail.
The pipeline i ~ constructed of 24-inch diameter PVC pipe, with a run of approximately 670 feet. Surface water is
conveyed int< the pipe via a catch basin, from a surface elevation (prior to mining) of 7216, dropping to a pipe invert
elevation of 7 207.65. The pipe discharges in an outfall with an invert elevation of 7204.15, for a total drop of 3.50
feet in 670 fey ~t, or 0.52% (0.0052 ff/ft) slope. Using gravity flow (not foroed flow), this pipe is capable of carrying 22
cfs, which is s pproximately 10% more than the estimated 20.4 cfs for worst case pumping. In this worst case
(highest flow) situation, the water would flow at a velocity of 7 fps, which is less than the 6 fps upper limit for
Four States Aggregates, LLC 15 MAR 2001
Application for Permit: Line Camp Pit M-2001-001 FSA-LCP-D2-001