HYDRO26008

• Permit No: C1981041
• IBM Index Class Name: Hydrology
• Doc Date: 9/22/1995
• Doc Name: STORMWATER MANAGEMENT PLAN POWDERHORN COAL CO
• Permit Index Doc Type: NPDES
• Media Type: D
• Archive: No

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999
RECEIVED
STORMWATER MANAGEMENT PLAN
POWDERHORN COAL COMPANY ~F;~ ~ `~ 199
August 29, 1995
Dlv(sion of Minerals 8 Gea!c,?y
Grand Jun~'i
1. Description of Miaiag Operation Powderhorn Coal Compan~O1~wns
and operates the Roadside North and South Portal underground coal
mines. As a part of the operation, facilities are located on the
surface to provide necessary support. A total of 10,170 acres are
within the permit boundary including approximately 380 acres
permitted for disturbance in our Division of Minerals and Geology
(DMG) Mining and Reclamation Permit No. C-81-041.
The major operation on the surface is coal handling and processing.
Raw coal is transported to the surface on conveyor and stockpiled
at the individual sites. A heavy media coal preparation
(cleaning) plant is located at the Roadside South Portal (RSS) and
is directly fed with coal from the raw coal stockpile. Coal from
the Roadside North Portal (RSN) is screened and/or crushed and
transported by truck to the RSS raw coal stockpile for cleaning or
to the Unit Train Loadout (UTL) for blending. An overland conveyor
belt is used to transport the clean coal from the preparation plant
to the UTL where the clean coal is stockpiled prior to shipment.
From the UTL the coal is loaded in train cars or loaded in truck
for shipment to customers.
Waste material from the coal cleaning process (refuse) consists of
rock ( sandstone and shale), low quality coal (high ash), and coal
fines. This material is disposed of on site in refuse disposal
areas. Trucks are used to haul the refuse to the disposal areas.
At the site, the material is spread and compacted in 2' lifts. The
outslopes and the top are eventually covered with dirt and
revegetated.
Support facilities for these operations and the mines include a
bathhouse, shops, warehouses, an office, storage areas, fans, etc.
2. Area Subject to Effluent Limitations Guidelines The majority
of the disturbed mine site is covered by an. industrial waste water
permit, CO-0027146 and therefore not covered by this SWMP. Four
outfalls cover mine discharge and ten outfalls cover surface water
runoff. One of the mine discharge outfalls includes a small amount
of surface water runoff. The design of surface water routing and
containment is permitted with DMG and is monitored regularly during
their monthly inspections. The site maps shows the boundary of
drainage areas associated with the outfall. A listing of these
areas by outfall number including a brief description of operations
within the area are as follows:
001 - Mine discharge from the RSS.
002 - Mine discharge from the RSS.