1998-04-15_INSPECTION - M1983067

• Permit No: M1983067
• IBM Index Class Name: Inspection
• Doc Date: 4/15/1998
• Doc Name: STAGECOACH STOP PIT PN M-83-067 RECLAMATION COST
• From: DMG
• To: MOBILE PREMIX CONCRETE INC
• Media Type: D
• Archive: No

^ • � IIII IIIIIIIIII I
_ 999
STATE OF COLU1�uy
DIVISION Of MINERALS AND GEOLOGY
of
Department of Natural Resources
I)I3 Sherman St., Roam 21 5
Denver,Colorado 80203
Phone [phone]
FAX [phone]
April 15, 1998 DEPARTMENT OF
NATURAL
Julie Goettemoeller RESOURCES
Rov Romer
Mobile Premix Concrete, Inc. Govemor
1590 West 12th Avenue James Lochhead
Denver, CO 80204 Executive Director
Michael S.Long
Division Director
RE: Stagecoach Stop Pit - Reclamation Cost, Permit No. M-83-067
Dear Ms. Goettemoeller:
As you know, the Division is in the process of calculating a current reclamation cost for planned
mining disturbances at the Stagecoach Stop Pit. Review of the mining and reclamation plan
indicates that approximately 2,000,000 tons of commercial grade aggregate will be removed and
the pit will be reclaimed to a 37 acre lake with surrounding area topsoiled, seeded with grasses,
and planted with shrubs and trees. On March 19, 1998 I checked with the Office of the State
Engineer and found that there was no application on file for a temporary substitute supply plan or
an augmentation plan for the site. The Division is well aware of the on-going process of Western
Mobile and the Office of the State Engineer to resolve outstanding water rights issues at various
sites permitted by Western Mobile. (Please see attached copy of April 9, 1998 Division
correspondence from Christina Kamnikar).
The Adams County soil survey suggests that the area to be mined has an average topsoil cover of
8 inches and 16 inches of overburden. Approximately 15 feet of mineable deposit will need to be
removed in order to produce 2,000,000 tons of aggregate. The permit application indicates that
the current topography at the site ranges from 5020 to 5006 feet and the anticipated high water
elevation is 5002 feet. Assuming a total depth of excavation of 17 feet there will be an average
of 8 feet of water exposed during excavation.
The Division's policy on calculating reclamation costs for pits with exposed ground water in the
absence of appropriate water rights is to include an itemized cost for backfilling the pit to an
elevation that is 2 feet above the average high water mark. If sufficient fill material is not
available on site, the Division will also include an itemized cost for importing the required
volume of inert fill material. The Division estimates that the depth of backfilling needed at the
Stagecoach Stop Pit will be 10 feet, resulting in a total volume of 580,800 cubic yards of backfill
material needed. The estimated volume of overburden available for backfilling is 96,800 cubic
yards, leaving a deficit of 484,000 cubic yards of material. Therefore, the cost of backfilling the
pit to an elevation of 5004 feet will be excessive.