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2009-02-23_GENERAL DOCUMENTS - C1981020
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2009-02-23_GENERAL DOCUMENTS - C1981020
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Last modified
8/24/2016 3:43:46 PM
Creation date
2/24/2009 2:10:29 PM
Metadata
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Template:
DRMS Permit Index
Permit No
C1981020
IBM Index Class Name
General Documents
Doc Date
2/23/2009
Doc Name
Proposed Decision & Findings of Compliance for SL1
From
Phase I for 17.2 (mine 14.3/loadout 2.9)
Permit Index Doc Type
Findings
Email Name
MPB
Media Type
D
Archive
No
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were identified at any of the reclaimed/narrowed road locations. The former portal access road and <br />the light use road were reclaimed in accordance with the reclamation plans. <br />The waste disposal site was included in this Phase I bond release request. The final coal mine waste <br />bank inspection of the Munger Canyon Mine waste disposal site was conducted in April 2008 in <br />accordance with Rule 4.10.2(2)(a). The pile has been covered with 3.5 feet of non-toxic cover, 6- <br />inches of topsoil, extensively roughened, seeded, and mulched. The final certification dated 4-16-08 <br />was provided to the Division by James E. Stover, P.E. The waste disposal site (Photograph No. 8) <br />was inspected and no appreciable erosion or other problems were identified. <br />Drainap-e Reestablishment <br />The entire Munger Canyon Mine site was viewed during the inspection. There were no <br />impoundments included in the bond release request area. There are ten post-mine channels approved <br />as permanent features including the following designated channels A, Al, A2, B, C, D, E, F, G, and <br />H. All permanent post-mine drainage channels were inspected as part of this Phase I bond release to <br />assess general design compliance. Channel design information is provided in Appendix M (vii), <br />channel locations and cross-sections are shown on Figures 3.1-5, 3.1-6, and 3.1-7. Channel profiles <br />are provided in the PAP on Figures 3.1-5-A and 3.1-6-B. All of these channels are located at the <br />formal portal access road. Preexisting drainages were reestablished and culverts removed. The <br />premining drainages crossing the road were excavated to approximate the original channel shape and <br />lined with riprap to provide a stable channel. <br />Drainages were reconstructed as post-mine features at all of the ephemeral tributaries crossing the <br />portal access area. Surface runoff control appears adequate. Reconstructed drainages throughout the <br />reclamation remain in good condition with only minor repair needed on one channel as described <br />below. Photographs of all of the post-mine channels are provided in Photo No.'s 9 through 17 at the <br />end of this inspection report. All of the permanent drainage channels are well constructed and meet <br />the design criteria. Most if not all of the channels are over-constructed with respect to the design <br />specifications. Only one channel was noted during the inspection as requiring maintenance and <br />repair. Channel E shown in Photo No. 18 is washed out at the base of the channel and will require <br />additional placement of riprap and repair of the channel liner. All other post-mine channels were <br />stable and well maintained with no other problems identified. Overall the 10 permanent channels <br />have functioned well with no significant erosion observed since they were constructed. <br />Several silt fence locations will require maintenance and repair. The silt fences located adjacent to <br />Channel H are either full of sediment or they are no longer installed properly or adequately keyed in <br />to retain sediment. These silt fence locations near Channel H are shown in Photo No's 19 and 20. In <br />addition, all of the silt fences located at the portal area are nearly full of sediment and need to be <br />cleaned and properly maintained. Photographs of the silt fences located in the portal area are shown <br />in Photograph No. 21. The silt fence located at the reclaimed topsoil pile (Photograph No. 22) is also <br />in need of repair and is no longer functioning. Silt fence repair is considered to be a maintenance <br />item that would not preclude Phase I bond release. <br />9
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