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_INSPECTION - C1981020 (26)
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_INSPECTION - C1981020 (26)
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Last modified
11/6/2020 3:39:07 PM
Creation date
12/22/2008 11:44:24 AM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1981020
IBM Index Class Name
INSPECTION
Doc Name
Inspection Report
Inspection Date
12/3/2008
Email Name
MPB
Media Type
D
Archive
No
Tags
DRMS Re-OCR
Description:
Signifies Re-OCR Process Performed
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III. COMMENTS -COMPLIANCE <br /> Below are comments on the inspection. The comments include discussion of observations made <br /> during the inspection. Comments also describe any enforcement actions taken during the inspection <br /> and the facts or evidence supporting the enforcement action. <br /> Photographs of all of the post-mine channels are provided in Photo No.'s 4 through 12 at the end of <br /> this inspection report. All of the permanent drainage channels are well constructed and meet the <br /> 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 repair. <br /> Channel E shown in Photo No. 13 is washed out at the base of the channel and will require additional <br /> placement of riprap and repair of the channel liner. All other post-mine channels were stable and well <br /> maintained with no other problems identified. Overall the 10 permanent channels have functioned <br /> well with no significant erosion observed since they were constructed. <br /> Several additional silt fence locations will require maintenance and repair. The silt fences located <br /> adjacent to Channel H are either full of sediment or they are no longer installed properly or adequately <br /> keyed in to retain sediment. These silt fence locations near Channel H are shown in Photo No's 14 and <br /> 15. In 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 in <br /> Photographs No. 16. The silt fence located at the reclaimed topsoil pile (Photograph No. 17) is also in <br /> need of repair and is no longer functioning. To ensure compliance, please clean out and make all <br /> necessary repairs to all of the silt fences noted above, as soon as practicable. <br /> Backfill and Grading <br /> The majority of the reclaimed areas of the mine site were stable with adequate surface water runoff <br /> control. Observations were made throughout the inspection with regard to the erosional stability of the <br /> reclaimed landscape. The most significant challenge associated with the reclamation at the Munger <br /> Canyon Mine was the construction of stable backfill slopes at grades of up to 2H:1 V in the portal area <br /> and along the portal access road. To ensure that the reclamation of the mine site and road would be <br /> stable, analysis of stability was performed on three areas on the road and two on the mine site. The <br /> stability analysis is described on pages 3-8 through 3-11 of the PAP. The reclaimed configuration is <br /> shown on Figure 3.1-5 through 3.1-7. Reclamation stability cross-sections are provided in the PAP on <br /> Figures 3.1-8A, 3.1-9, and 3.1-9A. As shown in Figure 3.1-9A at Station 49+25 the backfilled area <br /> west of the portals was reclaimed to an overall, approximate 3:1 slope. This was verified with field <br /> measurements using an inclinometer at two locations west of the portals where an average slope of <br /> 42% or slope ratio of 2.4:1 was measured. Slopes along the former portal access road and in the area <br /> of the mine portal backfill were extensively roughened by track hoe gouging. A quick growing annual <br /> cover crop ("Quickguard" sterile hybrid) was hand broadcast immediately following completion of <br /> grading and surface roughening. Permanent seeding was done by hand broadcast followed by <br /> mulching in November 2007. <br /> Overall the reclamation project has been very successful and there has been minimal erosion to date. <br /> The graded backfill slopes in the portal area blend in well and conform to the original topography. The <br /> portal access road reclamation generally blends into the adjacent steep slope and outcrop topography. <br /> There are segments of steep road cut exposed along portions of the reclaimed road but these are <br /> approved in the reclamation plan based on backfill stability considerations. A portion of the backfilled <br />
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