PERMFILE58702

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

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Exhibit G
Exhibit G CMLRB 112 Permit Application
Agile Stone Systems. Inc.
Water Information
1.0 Introduction
The 7.5 minute map of the project area, Exhibit B, shows the area's 2 water sources. The
Arkansas River flows west to east just south of the project boundary with water flows
varying from about 300 to 8,000 cfs (USGS Station # 07094500) depending on the time
of the year and snowfall. The Currant Creek from the north flows into the Tallahassee
Creek which flows from the northwestern comer of the property in a south east direction.
The creek's regular flow ranges from nothing to a couple of cubic feet per second. The
Tallahassee Creek sepazates the gravel mining azea from the sandstone and granite quarry
mining areas. Rock will be screened and crushed at each mining site and rail loaded for
shipment on the gavel baz. Two crossings will be built across the Tallahassee Creek to
haul rock by truck and railroad across the Tallahassee Creek to the plant and loading area
on the gravel baz. Traffic will vary 2% to the sandstone quarry and 98% to the granite
quarry. Dust from roads, screens, crushers, belts, stockpiles and related operations will
be controlled with water.
Nine contract studies were commissioned to obtain data and document project surface
• and ground water information.
1) Storm Water Events: Crossing Design, Stormwater Ponds and Berms
The crossings noted above need to recognize Tallahassee flood levels and flows to
design suitable crossings. A massive watershed study was commissioned to
Verkaik & Associates, engineers, to evaluate storm events and engineer crossings
for the mine plan. Synthetic Unit Hydrographs for 75 sub-basins over 287 squaze
miles were generated by Eagle Point software. The conclusions from this work
were used to engineer and design crossings as specified by the Division of
Minerals and Geology.
The watershed areas directly north of the sandstone and granite quarries were
similarly evaluated by the same engineering firm and software in a second study
to design the storm water berms and ponds near the quarries.
Two field percolation tests at the gravel bar plant and pit areas and 1 field
percolation test at the granite plant area were conducted by Azurite, Inc. 7/97.
The work was conducted to document the surface gravel's ability to absorb and
transmit rain water as opposed to water flowing over the surface.
2) Water Table Level
There aze no wells within 200' of the project disturbed azeas, no open water
involved in mining, no wells used to obtain water and no activities within the
• waters of the U.S. Nevertheless, 2 surface and ground hydrological studies of the