HYDRO20139

• Permit No: C1980007
• IBM Index Class Name: Hydrology
• Doc Date: 12/12/2005
• Doc Name: Discharge Permit CO-0038776
• From: Colorado Department of Public Health
• To: Mountain Coal Company, LLC
• Permit Index Doc Type: NPDES
• Media Type: D
• Archive: No

PARTI
Page No. 13
Pcrtrdt No.: CO-0038776
Inactive Mining Ateas
The SWMP shall include the following items for the inactive portions of the site, at a minimum:
i) Description of Minim Activities
The plan shall provide a nazrative description of the mining and associated activities that took place at the site. The
narrative descnphon shall report the approxunate dates of operation, the total acreage within the mme site and an estimate
of the number of acres of drsturbed area. A general description .of the location of the mining site relative to major
transportation routes and communities shall also be provided.
ii) Site Map
Each plan shall provide a generalized site map or ma s which indicate any of the following which maybe applicable:
- mining/millmg site boundaries and access and haul roads;
- azeas used for storage of overburden, materials, soils, tailings or wastes;
- azeas used for outdoor manufacturing, storage or disposal of materials;
- tailings piles and ponds;
- an estmlate of the dtrection(s) of surface flow;
- existing structural control measures to reduce pollutants in stormwater runoff; and
- springs, streams, wetlands and other surface waters.
iu} Stormwater Management Controls -Identification of Sources and Best Management Practices
The SWMP shall identify potential sources of pollutants at the site and' assess the ppotential of these sources to contribute
pollutants to stormwater discharges associated with rmning activities. The SWMP must also describe appropriate Best
Management practices (BMPs) to reduce the potential of these sources to contribute pollutants to stormwater discharges.
The appropnateness and priorities of controls m the plan shall reflect identified potential sources of pollutants at the mining
site. The description of the BMPs shall include:
a) Stormwater Diversion: Describe how and where stormwater will be diverted away from potential pollutant sources to
prevent stormwater contamination.
b) Sediment and Erosion Prevention: Describe practices that will be used to reduce erosion and prevent sediment delivery
to State waters. These could include stmctural (such as silt fences, sediment ponds, drop structures, check dams) and
non-structural (such as mulching and revegetaiion) methods.
iv) Comprehensive Lvspection
The SWMP shall identify qualified personnel that shall inspect desi ted equipment and mine azeas at appropriate
intervals specified in the plan, at least twice a yeaz (in the spring an fall). The operator shall kegp a record of such
inspections. This record shall be made available to the Division upon request and summarized in the Annual Report (see
Part I.E.1 of the permit).
v) Additional SWMP Items for Sites Seeking Pernrit Tenhination
Additional requirements apply in the event that the pemuttee wishes to remediate the inactive mine site and terminate permit
coverage, The permii`,ee shall nom the Division as to the chargge in stains. Notificaticn shall be prior to the
implementation o£ the remediation work, if possible. The SWMP must be amended to include the following items, prior to
implementation of the remediation work (ifpossible):
a) Documentation of Permission: The plan shall include documentation of permission from the land owner, if the
remediation work is undertaken by someone other than the land owner.
b) Photoggraphs: The plan shall include photographs documenting the condition of the inactive mine site before any
remedral action has occurred. For recently active mines, photographs of the active mining phase may be substituted.
c) Description of Remedial Action: The plan shall describe the remedial action that will take place to minimize or
eliminate the water quality impacts from the mine waste. The description shall include:
- Remediation Goal Statement;
- the chazacteristics of the mineralogical content of the mine-waste, and estimated volume of the waste;
- description of any materials that will be mixed into the mine waste on site; and
- estimated surface azea of the final site, aad estimated angle of side slopes.
d) Description of BMPs during Remediation Activities: The plan shall describe BMPs that will be implemented to reduce
the potential of remediation activities to contribute pollutants to stormwater discharges. Achvtties that shall be
addressed include vehicle maintenance, earth moving, material storage and spill prevention.
e) Procedures for Disposal of Water Stored Within Mine Waste: The petznittee must describe how any water stored
within the mine waste wtll be collected and/or routed to any storage or treatment facilities. No discharge of this water
shall be made to waters of the state, unless sepazate permit coverage is obtained.
f) Description of Permanent BMPs, Final Site Stabilization, and Ultimate Land Use: The plan shall include a description
of the specific permanent measures that will be installed or used at the mine-waste site. The description shall include
any of the following if appropriate: sppecifications for capping or isolation of dte mine waste, method and type of
revegetation, and other permanent BMPs. The plan shall also include a description of the ultimate land use after
;emedration u complete.
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