PERMFILE52862

• Permit No: M1997054
• IBM Index Class Name: Permit File
• Section_Exhibit Name: EXHIBIT D MINING PLAN
• Media Type: D
• Archive: No

Eshibil D CMLRB 112 Permit Application
Agile Stone Systems. Inc.
• 7.0 Water Management and Hydrologic Considerations
7.1 Storm Water Management
All current aspects of project's stormwater management plan have been, are or will be
presented within this application. Particular azeas discussed include:
1) the watershed studies impacting the Tallahassee and Currant Creeks flow rates
and levels,
2) the determination of appropriate 10, 25 and 100 year stormwater levels,
3) engineered designs for crossings, stormwater berms and ponds,
4) engineered roads and associated swales and ditches,
5) engineered railroad tracks and associated swales, ditches and 1 cmp pipe,
6) field percolation tests obviating the need for much if any stormwater plans or
structures,
7) grading of both plant azeas into either the granite stormwater pond or the lower
levels of the gravel pits east and west of the gravel plant azea and
8) reclamation plans to grade, revegetate and eliminate erosion potential.
A copy of the supplementary plan sections involving state statutes and best practices
adopted by the applicant is also enclosed. All these items constitute the applicants
expected storm water management plan.
Planned stormwater temporary stabilization practices include: seeding and mulching of
topsoil stockpiles and other project areas; and construction of temporary diversions.
• Straw bale dikes will be entertained at the request of Division personnel or if site
conditions warrant their installation. Permanent stabilization practices include: grading;
contouring; swale, ditch and a cmp pipe installation along road and railroads;
revegetation of all disturbed azeas; and retaining the stormwater berms and ponds.
7.2 Consumptive Water Use
Water consumption in the project will be limited to dust control and office/service use.
Dust control includes dust from roads, product crushing and screening, conveyor belt
transfer points, stockpiles and loading. Original water consumption estimates of about 30
million gallons per year have been reduced to less than an estimated maximum 8.9
million gallons/year by the fifth year of operations. Sufficient Twin Lakes water shazes
have been acquired to cover all anticipated water consumption. Water will be pumped
from the Arkansas River and piped in about a 2"pipe to the service and plant areas.
Due to the gravel baz's percolation confirmed from field tests by Azurite, Inc. (August,
1997), there can be no excess runoff from haul road watering and product wetting
operations. All water will either evaporate or percolate directly and immediately into the
highly permeable sand and gravel underlying the project's permit area. 96% of all water
applied to stockpiles will percolate into and through the sand and gravel in the same way
most municipalities filter their drinking water. 100% of all water applied to roads,
crushers, screens and belts will evaporate. Any water exfiltrating through the gravel bar
will exit the gravel bar into the Arkansas River possibly via existing springs flowing from
. the north bank of the Arkansas River south and east of the railroad loop track azea.
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