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GENERAL42722
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Last modified
8/24/2016 8:11:31 PM
Creation date
11/23/2007 11:56:22 AM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1980002
IBM Index Class Name
General Documents
Doc Date
5/15/1992
Doc Name
PROPOSED DECISION & FINDINGS OF COMPLIANCE FOR RN2
Permit Index Doc Type
FINDINGS
Media Type
D
Archive
No
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pile will have 3:1 side slopes and be compacted to 90% of standard proctor in two foot lifts. <br />Piles of the size proposed aze inherently stable at a static safety slope factor of 1.5 or more. <br />Therefore, as long as the pile does not exceed 1,000 cubic yazds, no stability analysis should <br />be necessary. During the original permit review no pile dimensions were presented so the <br />Division so stipulation No. 3 was attached the Division's approval (this stipulation was <br />changed to No. 2 in the 1987 findings). Stipulation No. 3 was attached to the original <br />approval and still applies to this operation. This stipulation with a discussion can be found <br />in section B, part VIII, Coal Mine Waste Banks of these findings. <br />Reclamation Plan <br />Reclamation will consist of regrading the disturbed area to approximate <br />original contour, topsoiling with one to two inches of soil, and seeding with native species <br />to achieve the post-mining land use of grazing and wildlife habitat. The only topsoil <br />available for reclamation, since most disturbance occurred prior to reclamation laws is that <br />salvaged in 1980 during construction of the sediment control system. This depth of topsoil <br />should be sufficient to achieve successful reclamation due to the good quality of subsoils. <br />In addition, as the area of disturbance is small (3.2 acres), natural invasion from surrounding <br />native vegetation will greatly enhance revegetation efforts. The reclamation plan can be <br />found on pages 13 -15 in the permit application. <br />Backfilling and Grading <br />The approved backfilling and grading plan included <br />to approximate original contour. The material used <br />be pushed into the cut slopes with a dozer or pulled <br />Revegetation <br />as Exhibit 5 shows regrading the area <br />to construct the two bench areas will <br />up using a backhoe. <br />The operator requested that the revegetation success standard for shrub density be lowered <br />from the pre-mining density of 35,000 shrubs per acre to 1,500-2,000 shrubs per acre with <br />an increase in herbaceous cover from 24% to 45%. This is acceptable to the Division for <br />the following reasons: 1) 1,500-2,000 shrubs per acre would create an open area with more <br />value for grazing and wildlife use; 2) natural invasion of shrubs will occur readily because <br />of the small azea of disturbance (3.22 acres); and, 3) the increased herbaceous cover will <br />compensate for the decrease in shrub cover, thus stabilizing the soil and minimizing erosion. <br />The revegetation success standard for herbaceous production was determined at 125 grams <br />per square meter. This standard was determined by increasing the measured pre-mining <br />production proportionally to the increase in herbaceous cover. The establishment of this <br />O.C. Mine No.2 Findings 15 May 15, 1992 <br />
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