PERMFILE58311

• Permit No: M1980183
• IBM Index Class Name: Permit File
• Doc Name: COMMERCIAL GRAVEL THICKNESS PAGE 12 OF 23
• Media Type: M
• Archive: No

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NOME STREET
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COMMERCIAL GRAVEL DEPOSITS GEOLOGIC IMPACT
The gravels located within the proposed MCA 29 pit The proposed gravel operation will irreversably alter
clearly constitute a commercial deposit. the existing geology. No geologic hazards presently
Representative samples were analyzed as shown on exist nor will there be any created by the proposed
the Gravel Gradation Test Results , p. 16 . They mining operation. During operations, temporary
exceed the criteria for identifying commercial gravel slope instability could occur along the perimeter of
deposits as set forth in the Colorado Geological the active mining areas. Any instability from this
Survey's Special Publication 5 —A, "Sand, Gravel temporary condition will be in the form of sloughing
and Quarry Aggregate Resources, Colorado Front and raveling of slopes, but not mass movement. Legal
Range Counties" and are therein mapped as: "Flood restrictions, such as boundary setback and fencing,
plain and terrace deposits; gravel, relatively clean will confine this temporary situation to mine
and sound." operations.
The ratio of overburden to commercial gravel After removing the sand and gravel deposit, the
deposits is well within the criteria established in property will be graded as shown in the Final
Publication 5A which specifies a maximum stripping Configuration Plan, p. 22. The pits will be formed
ratio of 1:3 for overburden versus resource. into permanent reservoirs. Beginning at the setback
Quantities of gravel which can be mined were distance of 25 feet from the property line in each
determined from this isopach (Thickness of parcel, the reservoir's sides will remain 3:1
Commercial Gravel Deposits) map. Along the entire (horizontal to vertical) from ground surface to ten feet
property boundary, the limit of excavation is based on below the normal water surface elevation of the
a 25 -foot setback with 3:1 (horizontal to vertical) reservoir. From that elevation to the bottom of the
slopes from the ground surface to 10 feet below the reservoir, the side slopes will be 2:1 (horizontal to
proposed lake level and 2:1 (horizontal to vertical) vertical).
slopes from 10 feet below lake level to bedrock
surface in each parcel. Therefore, based on the BLATCHLEY ASSOCIATES, INC.
foregoing, the total volume of gravel available at the Consulting Water Engineers
proposed 132nd and Nome pit (Parcels A and B
combined) is about 7,500,000 cubic yards.
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Test
boring by Chen & Associates Inc.
with
identifying number. Drilled 417179
A
Test
boring by Blatchiey Assoclater Inc.
with
Identifying number. Drilled 4117180
and
5129180
o B
Test
boring by Blatchley Associates Inc.
with
Identifying number. Drilled 612180
and 6/3/80
I �Ns
Thickness
of gravel In feet.
I
eq
Class: emit - . . _
Section /Exhibit �jt�tptbf--__._ _.!`_BL._._._._._._._.
Class: 0 Revision !
Class: 0 Report 0 Hydro Meneml
Doc Type: __________________ ________
DApplication (Coal only) 0 Bond O Enforcement 0 Inspection
THE BRA►IiTNAN SAND & GRAVEL COO
aR4 It' IM A® Pf f #2 Y9
COMMERCIAL GRAVEL
Q 00014607
SCALE O T00'200`300, GOO'
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