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2018-01-23_GENERAL DOCUMENTS - C1981041
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2018-01-23_GENERAL DOCUMENTS - C1981041
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Last modified
1/23/2018 1:45:42 PM
Creation date
1/23/2018 1:44:19 PM
Metadata
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Template:
DRMS Permit Index
Permit No
C1981041
IBM Index Class Name
General Documents
Doc Date
1/23/2018
Doc Name Note
For RN7
Doc Name
Proposed Decision and Findings of Compliance
From
DRMS
To
Snowcap Coal Company, Inc
Permit Index Doc Type
Findings
Email Name
JHB
Media Type
D
Archive
No
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<br /> <br /> <br /> 44 C1981-041 RN7 findings <br />in Tab 14. The reclamation plan for the top of the RSRDA was modified by approval of <br />PR-3, as the flat top of the waste pile is included within the designated alternative land use <br />area (see Exhibits 6C and 6C-A). The top of the pile has been gravel surfaced, and under <br />the “Industrial or Commercial” land use reclamation plan approved by PR-3, the area will <br />be left “as is” for use as a storage site for equipment and supplies associated with the <br />commercial fruit operation. The area will not be topsoiled or revegetated. The 1st Quarter <br />2007 refuse pile certification report documents that the required 18 inch minimum <br />thickness of non-toxic cover material was placed over the coal waste material on the flat <br />top of the pile. A short segment of existing Access Road 1 will be left in place for the <br />postmining use. It will connect to the upper end of proposed Access R oad 1A, to provide <br />access to the storage area on top of the RSRDA. <br /> <br />The lower three benches of CRDA-1 and CRDA-2 were covered with the approved <br />thickness of non-toxic cover, seeded, and mulched in the late summer/fall of 1994. Final <br />reclamation of the upper benches was conducted in the spring of 2002. <br /> <br />Geotechnical analyses for CRDA-1, and CRDA-2, are provided in Appendices 13-4 and <br />13-5 of the application. CRDA-1 has been constructed with three rock underdrains, and <br />construction specifications include 2:1 slopes with 10' wide benches on 30' vertical <br />intervals. The benches are sloped to the inside and graded to drain to perimeter ditches <br />along the sides of the pile. CRDA-2 specifications are similar, with the exception that pile <br />design does not incorporate underdrains, and slope between benches is not to exceed 2.5:1. <br /> <br />Stability concerns associated with higher than anticipated water levels in Piezometer <br />CRDA-01 resulted in suspension of waste disposal at the site in 1988, pending drainage <br />modifications and stability re-evaluation. Between 1988 and 1993, the lower three benches <br />were regraded to provide for better slope stability and drainage. Surface drainage was <br />improved by the construction of diversion ditches that allow surface runoff to exit around <br />the pile instead of contacting the face. <br /> <br />A stability evaluation was performed in the spring of 1994 by Western Engineers, Inc. As <br />a part of the study, pump testing was conducted in existing piezometers and 30 additional <br />piezometers were installed to evaluate phreatic surfaces and pore pressures. The results of <br />the study showed the pile to be stable as designed. Critical water levels were defined for <br />each of the 30 new piezometers. Based on the study results, the operator was permitted to <br />resume waste disposal at CRDA-1 in 1994. The operator has committed within the permit <br />to monitor the 30 piezometers quarterly, and if water level in any of the piezometers reaches <br />critical target depth as listed on Table 18-4, stability of the pile will be reevaluated and <br />corrective action taken if necessary. <br /> <br />CRDA-1, and 2 was monitored throughout construction. Monitoring included: <br /> <br />1. Piezometric monitoring of the coal processing waste embankment; <br />2. Monitoring of side slopes to maintain a maximum slope angle of 2:1 between <br />benches on CRDA-1, and 2.5:1 on CRDA-2; <br />3. Monitoring compaction of constructed lifts; and
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