REV97619

• Permit No: M1973007SG
• IBM Index Class Name: Revision
• Doc Name: EXHIBIT D MINING PLAN
• Type & Sequence: AM1
• Media Type: D
• Archive: No

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OVERBURDEN REMOVAL - On this side oC Academy Boulevazd, overburden (that material
between the bottom of the soil layer and the top of the sand) is essentially nonexistent. In other
words, the overburden is usually the soil. Although the first few Ceet of sand under the soil tends to
be very fine and produces a considerable amount of waste, it can be turned into marketable products.
In essence, the removal and stockpiling of overburden is covered under the previous section that
deals with soil salvage and stockpiling.
WATER HANDLING:
Throughout Phase lE, 2E, and part of Phase 3E, water control measures in the form of
sedimentation or detention basins are not needed. This is because, until Phase 3E is well along in its
development, all drainage from the mining areas will be into deep, closed basins. Until then no
sediment or water can leave the site and all drainage is essentially into the ground and the air.
Once Phase 3E is well along in its development, however, an outlet will be created that will
eventually connect most of the mined ]and east of Academy Boulevazd with the southwest corner of
Phase 3E. When that occurs, a sediment and/or detention basin will be needed to control runoff and
sediment entering the water control systems in the surrounding areas. Figures located at the end of
this exhibit show what is proposed for this area. The figures are from a study entitled "Little
Johnson/Security Creek Drainage Basin Planning Study" prepazed by Simons, Li & Associates, Inc.
for the El Paso County Department of Public Works, At this point the plans are subject to
considerable change. Because this pond will not be needed for about 12 to 18 years from now, only a
commitment is provided in this permit that the necessary control, developed in coordination with the
drainage district, will be designed and included when needed. Because that design will cause an
alteration to the permit, the design will be submitted as a technical revision when it is needed.
Until then, sll that is provided is an approximate location of where this detention retention pond will
go when it is needed. Nothing more than that can reasonably be provided because as surrounding
lands change under future development, the needs of the regional drainage system will probably
change. If a design was provided now, by the time it is needed it would probably be inadequate or
inconsistent with plans and needs at that time. The new design would need to be submitted then,
making the original design useless effort.
Another Ceature of the water system for this site will be established when the ditch is
relocated. The existing line of the ditch which extends along the east side of Academy will remain in
place. Agate will be installed in this route to control the amount of water flowing from the main
ditch to this side ditch. At the south end oC this ditch a pipe will be installed that will flow to a basin
shown on Exhibit C, Mining Plan Map. This basin will provide, through an agreement included at
the end of this exhibit, an aquifer recharge area.
The idea is to connect the holding basin with the aquifer underneath this area of the deposit.
The water that flows into the holding basin will be allowed to flow into the gravels, thereby
increasing the water contained in the aquifer. It is expected that this holding basin and supply line
will remain in place long after the operation is completed, thus continuing the recharge process
through the use of water from the irrigation ditch. This system, although not an invention of Transit
Mix, will be established as a cooperative effort to improve the water quantity and quality of the
aquifer underlying the mine area and extending on down the Fountain Creek valley. This aquifer
recharge system will be further addressed in Exhibit E, Reclamation Plan.
Easf of Academy
Mining Plan
Page D-13