PERMFILE108744

• Permit No: C1982056A
• IBM Index Class Name: Permit File
• Doc Date: 9/10/2004
• Section_Exhibit Name: 2.05 Operation and Reclamation Plans Part 2
• Media Type: D
• Archive: Yes

vegetation between the pad and Fish Creek. As a relatively small drainage area (approximately 4.25 acres), and given
the effectiveness of the drainage and sediment control measures, the additional disturbance that would be involved in
• constructing a sediment pond is not warranted. Sediment contributions from the small disturbed area can effectively
be controlled using the stated Best Management Practices (BMPs), and therefore falls under a Small Area Exemption
(SAE), consistent with applicable provisions of Rule 4.05.2(3)(b). There will be no discharge or mixing of mine
water with surface drainage from the site. Given the limited site area, a pad area that is surfaced with gravel, the
drainage and sediment control measures, and the effectiveness of the BMPs to reduce the peak settleable
concentration to 0.23 ml/L, TCC believes an SAE is justified. The estimated peak flow and runoff from the site for
the 10-year 24-hour storm event is 1.52 cfs and 0.17 ac-ft, respectively. The peak settleable concentration in the
runoff from the proposed Bleeder Shaft Pad area is less than natural settleable concentrations for runoff from
undisturbed lands, given similaz conditions.
The up-gradient diversion ditches will be triangular ditches designed to safely divert the peak flow from the 10-year,
24-hour storm with 1.0' of freeboard and located as shown on Figure 1, Bleeder Shaft Pad SAE. The shaft pad will be
constructed such that it slopes towards the gravel filter. The check dam and grass filter efficiency was modeled using
the SEDCADTM 4 check dam and grass filter utility. Exhibit 8T is submitted to demonstrate that application of
diversion ditches, drainage collection ditches, sediment logs, Curlex I erosion control blankets, a check dam and grass
filter can effectively treat the runoff from the bleeder shaft pad.
(5) Topsoil. A Han-ative exolainine the method of removal and the amount to be removed and the elan
for storap_e of topsoih subsoih and other material within the Hermit area subiect to requirements of the topsoil removal
performance standards of 4.06.2. This narrative shall specify the depth of material to be salvaged from all disturbed
areas based on the soil information required by 2.04.9 and shall specify the volume of each type of material to be
salvaged. A map of env nrooosed storage structures shall accompany the narrative. The mays shall be prepared
accordine to the requirements of 2.10.
• RESPONSE
See response to 2.05.4, Reclamation Plan, below for details concerning the Foidel Creek Mine. Twentymile Coal
Company does not propose to disturb any additional land within the Fish Creek Tipple permit area. The Fish Creek
Tipple and adjoining haulroad were constructed prior to the promulgation of regulations mandating topsoil salvage
and storage. Thus, the best plant growth medium available is a mixture of spoil and soil materials which will be
substituted for topsoil. This situation is further discussed within the Fish Creek Tipple/Loadout Appendix, pages
2.04-36 through 2.04-38 and pages 2.05-37 through 2.05-38 of Volume VIII.
EASTERN MINING DISTRICT
The Eastern Mining District Dewatering Facility will require salvaging and stockpiling approximately 13,360 CY
of topsoil from the access road and the facility site. During upgrading of the road, approximately 3,600 CY of
topsoil will be windrowed to the side of the road. The topsoil along the length of the road is approximately 30
inches deep. The facility site will require salvaging and stockpiling approximately 8,300 CY of topsoil. The
topsoil from the site area is approximately 30 inches deep. A test pit will be dug to verify the topsoil depth
obtained from previous soil mapping work. the stockpiled topsoil, which is located within the pad area, will be
stabilized with the topsoil stockpile stabilizing seed mixture. Additionally, approximately 6,295 CY of topsoil will
be salvaged from the treatment pond site. This site has been relocated closer to the road to facilitate delivery of
chemicals.
Bleeder Fan
The bleeder fan facility will require salvaging and stockpiling approximately 4,700 CY of topsoil from the access
• road and the facility site. During the upgrading of the road, approximately 2,800 CY of topsoil will be
windrowed to the side of the road and left in place. The 1,200 CY that will be salvaged from the road extension
TR 04-44 2.05-84.1 08/18/04