PERMFILE58702

• Permit No: M1997054
• IBM Index Class Name: Permit File
• Section_Exhibit Name: EXHIBIT G WATER INFORMATION
• Media Type: D
• Archive: No

Exhibit G CMLRB 112 Permit Application
Agile Stone Systems. Inc.
• 4.0 Project Water Use
The applicant will divert water from the Arkansas River to provide a water supply for
mining operations associated with its Pazkdale Project. These diversions will be balanced
in volumes and rates of depletion at all times by a combination of return flows through
the alluvial aquifer combined with replacement waters provided by purchased Twin
Lakes Shares. Retum flows result from an excess of water diverted over that consumed
by evaporation in dust control, and from the recharge of Twin Lakes water in excess of
the required replacement amount. Overall, the Plan provides a net benefit to the
Arkansas River during its operation.
The water supplied to the Project will be pumped directly from the Arkansas River.
Water will be used to control dust from the roads, stockpiles and crushing/screening,
Consumptive water use due to mining consists of evaporation from dust control.
Reclaimed areas will not be irrigated.
After the river water is applied to stockpiles, the un-consumed water will percolate
downward to the water table, and then move laterally through the gravel deposit toward
the Arkansas River. As a result of the deep percolation of the un-consumed water, the
water table will be somewhat elevated, or "mounded", in the vicinity and down gradient
of the stockpiles.
• Agile proposes to divert water from a point on the Arkansas River with a small pump and
small pipeline to transport the water to its points of use. Water not consumed by the
operation will be returned to the alluvial aquifer, and thence to the Arkansas River. Twin
Lakes Shares will be used to replace the consumptive use, plus the lag time effect in the
ground water system.
No ground water will be exposed by the mining operations, as gravel will be mined to
above the water table elevation. The top of the gravel deposit is elevated 30' to
approximately 70' feet above the Arkansas River. Preliminary monitoring well drilling
has found at least 20' to +40' of gravel before encountering either no water at bedrock or
the water table, and 17' to at least 36' of gravel and sand below the water table.
According to the USGS in Map I-869, the gravel deposit originated as glacial outwash.
Portions of the gravel deposit are in hydraulic contact with the Arkansas River and the
lower reach of the Tallahassee Creek. Water discharges to the Arkansas River and
Tallahassee Creek via springs, seeps and ground water flow. Water quality and water
level data and interpretations indicate that the outwash aquifer is recharged along its
north edge by the Tallahassee Creek and by deep percolation of excess irrigation water
applied to meadows and hayfields west of the Project.
No bedrock water will be involved in the Parkdale Project. To a limited extent,
mounding in the outwash aquifer may raise water levels in bedrock wells located north of
the Arkansas River and in the same structural block as the Project.
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