PERMFILE52862

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

Exhibit D CMLRB 112 Permit Applica[ion
Agile Stone Systems, Inc.
• Fragmented granite rock from mining will be loaded with afront-end loader into haul
trucks or rail cazs. The material will be dumped and stockpiled, crushed or screened at
both the quarry plant and gravel plant areas. Grizzlies will be used to separate rip rap
product from smaller material to be crushed. The gravel plant azea will be developed first
using rock hauled from the quarry to the plant. After sufficient flat land is developed at
the quarry, the crushed stone portion of the plant may be moved to the quarry plant area.
All process equipment at the granite quarry site will be portable equipment. No
substantial concrete structures will be located in this area other than the crossing
bulkheads on the both sides of Tallahassee Creek.
Initial activities at the granite quarry will include limited topsoil salvage. The southwest
area of Phase I may have up to 30' of alluvium materials, primarily weathered granite,
removed from the granite plant area to flatten the plant area. The plant area will be
graded to drain south into a stormwater collection structure. The removed alluvium
materials will be used to construct the diversion berm shown in the Mining Plan Map
along the west boundary of the granite azea. This berm will allow the natural existing
drainage to continue and divert any water from the watershed area north and west of the
quarry into the Tallahassee Creek preventing any water from entering and crossing the
plant area. The berm will then continue to the east and southeast functioning as a
retention berm as the project develops. In the southwest part of the quarry area it will
form the southern boundary of the stormwater structure. The quarry topsoil will be used
• to cover the berm 9" thick and then be seeded, fertilized and mulched. Any excess
topsoil will be stored in the temporary topsoil stockpile. If topsoil is insufficient, it will
be recovered from the temporary topsoil stockpile.
The stormwater collection structure located at the southeastern end of the plant area
forms a containment structure to capture any water and sediment leaving the quarry and
plant areas during a storm. The berm, pond and spillway configuration will handle 10 to
100 year storm events. The quarry area's watershed was mapped and modeled by a
contract professional engineer to design these items. (Verkaik, 1 I/97)
The 100 yeaz storm water flood event has been calculated to produce a high water
elevation at 5,771.25'. This latter calculation includes a 0.5"/24 hour or a 17% safety
margin in the event calculations. (Verkaik 12/97) The berm will rise from the southwest
end at 5,775' to about 5,830' to the north along the quarry western boundary. The
retention bemt will continue east and form the southern end of the storm water pond at
the 5,785' elevation eventually merging into the granite outcrop to the east. As quarry
phases II and III to the east aze developed, the diversion berm will be continued and
extended to the east and southeast in the granite bedrock neaz the 5,780' contour level
dropping to at or below the 5,760' level. The mined areas above 5,780' will continue to
be diverted into the storm water retention pond azea in the southwest. Mined areas to the
southeast where the quarry floor could drop below 5,780' will utilize the azea between
the first bench and the base of the retention berm to more efficiently contain and/or
• control storm water run-off at the lower elevation.
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