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2015-10-08_REVISION - C1981041 (12)
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2015-10-08_REVISION - C1981041 (12)
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Last modified
8/24/2016 6:11:25 PM
Creation date
10/15/2015 9:16:22 AM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1981041
IBM Index Class Name
Revision
Doc Date
10/8/2015
Doc Name
Proposed Decision and Findings of Compliance
From
DRMS
To
Snowcap Coal Company, Inc
Type & Sequence
SL8
Email Name
BFB
DIH
Media Type
D
Archive
No
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Sedimentation Ponds 6, 10, 11 13, and CBA 1 Sump and CBA 2, were reclaimed and backfilled to <br />the approved design configurations given in the PAP. This was completed in October 2012. Pond 8 <br />was backfilled and reclaimed in October 2011 and Pond 9 was reclaimed in April 2013. All 6 of these <br />ponds and CBA 1 sump are being requested for Phase I release only. Pond 7 was reclaimed and <br />seeded in October 2011. This is the only pond that is being requested for full Phase I, II, and III bond <br />release. All ponds were backfilled and graded according to the approved final configurations as <br />detailed in the PAP. As -Built Profiles for these ponds and associated ditches are given in Tab 7 of <br />the bond release application. <br />HYDROLOGIC BALANCE <br />Ground conditions were dry at the time of the inspection. Significant storm events occurred at the <br />mine site and in the general vicinity during the months prior to the bond release inspection (July <br />through October). Data was obtained from the NOAA National Climatic Data Center (Station: <br />Palisade 3.3 ENE, CO US), which is located within the Roadside Portals permit boundary at the Ute <br />Water Treatment Facility less than 1 mile south of the North Decline area. The data obtained from <br />NCDC shows that the average monthly precipitation for Grand Junction was exceeded for each of the <br />months July through October, 2013. On August 24, 2013, 1.63 inches of rain fell at the Palisade <br />Station during a 24 hour period. This exceeds the 10 year, 24 hour design precipitation event of 1.4 <br />inches for ditches and diversions draining a watershed less than one square mile. This is an important <br />factor that likely contributed to the significant level of erosion in the ditches identified in the bond <br />release inspection as needing maintenance and/or repair. <br />All sediment ponds have been reclaimed at the Roadside Portals Mine. There will be no permanent <br />impoundments remaining at the site. The acreages requested for Phase I release for Ponds 6 through <br />10, 11, and 13 are shown on Attachment 2. SCC is requesting that 0.5 acres at the location of former <br />Pond 7 be fully bond released. All of the reclaimed pond sites are stable with no signs of erosion or <br />other instability related issues. SCC submitted total suspended solids demonstrations for each pond <br />site prior to reclamation. These were approved with TR -61 and PR -5 and are contained in the PAP <br />in Appendices 14-12 and 14-13. Grass filter designs are presented in Appendix 14-6 demonstrating <br />that silt fences that had once been located at the South Fan Area, 2 West Portals Area, B Substation <br />and the North Decline Dewatering Area are no longer required. An inclinometer was used to field <br />check gradients at several major drainage channels. Measurements taken were consistent with the <br />As -Built Ditch Profiles submitted with the SL -8 application. <br />The CRDA-1, CRDA-2, and RSRDA waste piles were inspected. Drainage and diversion ditches <br />were stable at the CRDA-1 and CRDA-2 sites. The RSRDA at the South Portal area was in very good <br />condition with no erosion or instability noted. Terrace drains and perimeter ditches are well vegetated <br />and functional at all three refuse pile locations. Photograph No. 1 shows one of the upper terrace <br />drains on CRDA-2. Some of the terrace drains have accumulated some sediment over time but they <br />all remain functional with adequate freeboard. No problems were identified at any of the refuse <br />disposal sites during the bond release inspection. <br />During the SL -8 bond release inspection conducted in October, 2013, two permanent drainage <br />features at the North Decline were not inspected along their entire length mainly due to time <br />constraints. These include the West Diversion Ditch No. 1 and the East Diversion Ditches No.'s 1 & <br />Page 10 <br />
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