REV102713

• Permit No: M1981286
• IBM Index Class Name: Revision
• Doc Date: 11/30/1992
• Doc Name: ADEQUACY REVIEW OF CONVERSION OF THOMAS GRAVEL PIT 4 FN M-81-286
• From: DMG
• To: WELD CNTY
• Type & Sequence: CN1
• Media Type: D
• Archive: No

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OF COLORADO
DIVISION OF MINERALS AND GEOLOGY -
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1113 Sherman SI., Room 215 N
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Denver, CO 80203 .
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Phone: [phone] ~ ~
FAX: D03) 832-8106
Ruy Romer
Governor
Michael d. Long
Uivnion Dneaor
November 30, 1992
Donald Carroll
Administrative Manager
Weld County Engineering Department
P.O. Box 758
Greeley, Colorado 80632
RE: Adequacy Review for Conversion of Thomas Gravel Pit No. 4, File No. M-81-286
Dear Mr. Carroll:
An adequacy review of the above-captioned conversion determined several areas of
concern as listed below. In order to review your responses by the approval decision date
of January 13, 1993, please submit them to the Division by January 6th.
1 . The conversion changes permitted acreage from 9.7 to 75.14 acres. Exhibit
D map shows the additional acreage to be permitted overlaying the existing
pit with several acres falling outside of the new permit on the south
boundary. Because reclamation has not been completed nor has there been
a performance warranty release on these acres, they must be added to the
75.14 acres. The Division requests that a new acreage figure be submitted
and mapped to include that part of the existing pit which lies outside of the
conversion acreage of 75.14.
2. Because topsoil depth is variable on the site (less than 6 inches as stated in
Exhibit D or 3 inches per the SCD Soil Survey for Cascajo gravelly sandy
loam), the Division requests that a 6-inch layer total of topsoil and
overburden be salvaged and replaced at that rate, allowing for swell and
compaction factors. The additional overburden salvaged at the time of
topsoil salvage should contribute additional organic matter and nutrients
found in the top six inches, whether it be topsoil or overburden.
3. West Greeley SCD has recommended that if the topsoil stockpile is stored
for more than one year, the pile should be seeded with the recommended
grass mix. The Division likewise requests a commitment to stabilize topsoil
stockpiles when the resource is not reclaimed on a backfill area within a time
short enough to avoid deterioration from wind and water erosion (Rule 6.4 of
the Mineral Rules and Regulations). Please state method of stabilization if it
differs from the SCD plan of seeding topsoil stockpiles with the approved
seed mix.