PERMFILE50765

• Permit No: M1994093
• IBM Index Class Name: Permit File
• Doc Date: 3/23/1995
• Doc Name: DAHLIA NORTH RES PIT FN M-94-093
• From: ADCO CONSULTING
• To: DMG
• Media Type: D
• Archive: No

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EXHIBIT D - MINING PLAN NARRATIVE
(Revised 01/06/95)
The permit area is 180+ acres in size and will be excavated to
provide sand and gravel. The depth of the resource is
approximately 30'. Other properties in the area have been mined for
sand and gravel, mostly by Cooley. This operation is the next
logical continuation of the mining by Cooley in the area.
Cooley is presently mining the property across 88th Avenue under
permit M-89-066. That permit was amended to include construction
of the conveyor line from that property across this one north to
the main processing..plant. This mining of property south of 88th
Avenue is nearing completion, and this operation will proceed to
the north. This operation is expected to be undertaken within one
year, and will last from five to ten years.
The end use for most of the property will be a water storage
reservoir enclosed within a slurry wall (Part of Area 2A and all of
Area 2B). Within the slurry wall, the active mining area will be
dewatered prior to mining, and temporary dikes may be installed as
necessary to ease pumping the active area dry from rainfall.
The portions of the property (Areas 1 and 2C), that are not within
the slurry wall, will not be sealed off from surrounding
groundwater. The areas not enclosed by the slurry wall will be
mined wet. The appropriate permission from the Colorado Division
of Water Resources and/or Water Court will be obtained for a
temporary augmentation plan for evaporative losses.
Area 1 and parts of Area 2C will be backfilled with sand spoils
from material generated on site. If any permanent lake is left on
part of Area 2C, a permanent augmentation plan will be prepared and
followed in accordance with approval from the Colorado Division of
Water Resources and/or Water Court.
water discharge from areas within the slurry wall will be pumped to
either two small lakes along 88th Avenue that Cooley also owns,
into the South Platte River, or into the Bull Seep. Cooley has a
current active and approved NPDES discharge permit for discharge
into the South Platte River, and as Cooley has done in the past,
the existing NPDES permit discharge points will be amended through
approval of the Water Quality Control Division for discharge into
either of these lakes, the South Platte River, and/or the Bull Seep
prior to any discharge occurring. If discharge to the Bull Seep is
utilized, permission from the owner of the Bull Seep Ditch (Fulton
Ditch Company) will also be obtained. In the event the Water
Quality Control Division will not allow the existing NPDES permit
discharge points to be changed, a new NPDES permit will be obtained
prior to any discharge occurring.