2016-12-12_PERMIT FILE - C1981019A ‎(2)‎

• Permit No: C1981019A
• IBM Index Class Name: Permit File
• Doc Date: 12/12/2016
• Doc Name: Permits
• Section_Exhibit Name: Volume 15 Rule 2
• Media Type: D
• Archive: Yes

RULE 2 PERMITS
Asphalt pavement specifications shall be based on a 30 year design life with a 15" thick base course
(gravel) and 8.5" asphalt thickness. The pavement design is based on 50 ton coal haul trucks with axle
loads of about 81 psi. This specification assumes an R-20 silty sand subgrade material. Base course shall
be CDOT Class 6 aggregate. A 6 foot high berm shall be used at all locations where the roadway is
elevated. Cut slopes shall be 0.51-1: IV or less when completed in competent rock. Elsewhere, cut slopes
in unconsolidated materials shall be laid back at 2H:IV or less as directed by the field engineer.
Requirements for fill placement shall be as specifically described in Rule 4.03.1 Haul Roads (3) (e) `Road
embankments". A ditch shall be installed at toe of all cut slopes. If needed, temporary erosion control
measures shall be implemented during construction to minimize sedimentation and erosion until
permanent control measures can be established.
There are two main haul roads that will be built to haul overburden materials from the pit to the
temporary overburden stockpile. These are shown on Map 25D and are designated as the East and West
Haul Roads. Please see section 4.03.1 for details pertaining to these two haul roads and haul roads that
will be constructed within the mining area. r
Two access raods will be constructed to access the Section 25 and 26 sediment ponds. The locations and
typically design information for these is shown in Volume 20, Exh. 25, Item 1 Figures 1 and Figure 2.
2.05.3 (4) Operation Plan — Ponds, Impoundments, and Diversions
To control runoff, and protect surface and ground water quality, Colowyo will construct several new
sedimentation structures and diversion ditches. All ponds, impoundments, and diversions are designed to
meet or exceed the requirements of 2.05.3(4) and 4.05.6. All sediment ponds will be constructed and
maintained in accordance with the parameters mentioned in Volume 1, Section 2.05. Impoundments will
be inspected quarterly as discussed in Section 4.05.6. Please see Exhibit 23, Item 1 — Geotechnical
Report Collom Temporary Spoil Pile and Pond and Exhibit 23, Item 2. Also refer to Exhibit 7, Item 25 —
Collom Post Mine Channel Design; Exhibit 7, Item 26 — Collom Pond Design Maps; and Exhibit 7, Item
23 (for information pertaining to diversion channels during mining) for specific designs and locations of
these structures.
The sediment ponds will remain in place until such time as the entire disturbance footprint area reporting
to these structures is reclaimed and the requirements of Rule 4.05.2(2) are met. The best case scenario for
this would be a minimum of 2 years after the last seeding occurs within the affected contributing
watershed. Therefore, the earliest anticipated removal of these structures is approxiamtely 2035.
2.05.3 (5) Topsoil
Prior to any mining related disturbances, topsoil will be removed from planned disturbance areas as
discussed in Section 2.05 (Topsoil Redistribution Plan) and Section 4.06 (Topsoil) and redistributed or
stockpiled as necessary to satisfy the needs of the reclamation timetable.
Topsoil will be removed by large crawler mounted bulldozers, loaders or scrapers as described in Section
2.05.3, Production Methods and Equipment.
Topsoil stockpile locations and extent of stripping is presented in Topsoil Handling Map (Map 28C).
Topsoil stripping will occur in advance of mining and can be anticipated to occur within the mine plan
blocks depicted on Map 23B. The overall life -of -mine topsoil balance is estimated in Table 2.04.9-16. It
should be stressed that these yearly figures are estimates and can only be useful as a general guide to
topsoil removal or replacement during any given year. In 2006, TR -62 was approved to modify topsoil
Collom—Rule 2, Page 78 Revision Date: 11/16/16
Revision No.: MR -166