PERMFILE125896

• Permit No: M1999120
• IBM Index Class Name: Permit File
• Doc Date: 3/23/2000
• Doc Name: L G EVERIST APPLICATION M-99-120 FT LUPTON SAND AND GRAVEL MINE ADEQUACY REVIEW
• From: DMG
• To: L G EVERIST INC
• Media Type: D
• Archive: No

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STATE OF COLORADO
DIVISION OF MINERALS AND GEOLOGY
Department of Natural Rewurces
1313 Sherman St.. Room 215
Denver, Colorado 80203
Phone: [phone]
FAX: [phone]
March 23, 2000
Mr. Rick Everist
L.G. Everist, Inc.
7321 E. 88ih Ave.
Henderson, CO 80640
RE: L.G. Everist, Application No. M-99-120 /
F[. Lupton Sand and Gravel Mine; Adequacy Review
Dear Mr. Everist,
DIVISION OF
MINERALS
GEOLOGY
RECLAMATION
MIN ING•SA FETY
Bill Owens
Governor
Greg E. Walther
Execu~ive Director
Michael B Long
Dwision Direcor
The Division received your letter dated March 10, 2000 regarding the Ft. Lupton Sand and Gravel
Mine New 112 Application, Permit Number M-99-120. A few remaining items need to be addressed
prior to approval of the application. The Division of Minerals and Geology (Division) is required to
make an approval or denial decision no later than March 27.2000, therefore, your response to the
following adequacy review concerns should be submitted to the Division as soon as possible.
The operator included additional information regarding the location and construction of [he
proposed access road from Weld County Road l8 leading to the permit area. Please inform the
Division if this road will remain as part of the postmining land use or if the road will be
reclaimed.
2. The following text is in relation to the slurry wall proposed for the Ft. Lupton Sand and Gravel
Pit;
The application proposes the installation of a slurry wall around the pit area prior to
commencement of mining. Design details are provided but no specifications or quality
control/quality assurance plan is included in the application. The application proposes to bond
for the cost to install the slurry wall. Such a bond could serve as a contingency if leakage were to
occur in excess of criteria established by the Office of the Slate Engineer or if the slurry wall
were to be damaged by pit slope failure. The unit cost in Exhibit L used to establish the amount
of required bond is $3.00 per square foot of slurry wall assuming a 36- foot depth for the wall.
Lined reservoirs that employ slurry walls to prevent hydrologic communication with ground
water are a viable water storage alternative and are adequate to meet the developed water
resources post mining land use. However, leakage of ground water through or around the slurry
wall into the pit at a rate in excess of 3x0.03 ft3/day/fr would constitute a failure to achieve the
designated post mining land use under leakage criteria established by the State Engineer. If an
operator were to mine out a pit within the perimeter of a previously installed slurry wall, and it