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2017-04-05_GENERAL DOCUMENTS - C1982057
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2017-04-05_GENERAL DOCUMENTS - C1982057
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Last modified
4/10/2017 10:14:52 AM
Creation date
4/10/2017 10:12:09 AM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1982057
IBM Index Class Name
General Documents
Doc Date
4/5/2017
Doc Name Note
Includes Reclamation Cost Estimate
Doc Name
Proposed Decision and Findings of Compliance
From
Seneca Property LLC
To
DRMS
Permit Index Doc Type
Findings
Email Name
JDM
JHB
Media Type
D
Archive
No
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a 407 -acre watershed that drains into Sage Creek of which only 29.5 acres were <br />disturbed by mining activities. <br />Pond 016 was constructed in the summer of 2000 in the Seneca II -W south extension <br />area. The pond treats runoff from 382.2 total acres. Discharge from this pond goes <br />into an unnamed tributary of Hubberson Gulch. <br />Pond 017, constructed in the fall of 2002, treats runoff from a 955 -acre watershed <br />including mine disturbance areas from the southern portion of the south extension of <br />the permit area. The pond is located on upper Hubberson Gulch near the southwest <br />corner of the south extension area. Pond 017 construction certification and "As - <br />Built" designs were included in PR -4 submittal materials. <br />Several of the sedimentation ponds have been proposed as permanent <br />impoundments, and the impoundments would are warranted to facilitate post -mine <br />livestock grazing and wildlife use. Documentation required by Rule 4.05.9(13) has <br />been provided for most of the ponds to allow for approval of any sedimentation <br />ponds as permanent impoundments. Pond 006, Pond 016, and Pond 017 still require <br />approval by the Colorado State Engineer's Office. The following commitment is <br />included in Permit Tab 13, page 5, regarding permanent impoundment <br />demonstration of compliance: <br />Permanent impoundments will be reevaluated prior to bond release and <br />remedial construction performed to satisfy the appropriate sections of the <br />regulations. Prior to submittal of a bond release request, SCC will submit a <br />complete technical revision demonstrating that each permanent impoundment <br />meets the requirements of 4.05.9(13). <br />D. Acid-forming and Toxic -forming Spoil <br />The applicant has submitted detailed analysis of the geochemical characteristics of <br />the overburden and interburden found in the Seneca II -W Mine permit area. Initial <br />drilling and geochemical sampling was conducted within the baseline study area <br />prior to initiation of operations. Additional drilling and sampling was conducted <br />within the south extension area in 1991. Until the 2003 approval of PR -3, coal <br />extraction was limited to the Wadge seam, and the initial baseline studies were <br />focused on Wadge overburden assessment. Strata from the surface to immediately <br />below the Wadge coal seam were sampled. Core holes were distributed across the <br />Wadge recovery areas in both the original permit area and south extension area <br />(Exhibits 6-6 and 6-6A). <br />PR -3 allowed for surface mining of the Wadge, Sage Creek and Wolf Creek Seams <br />within the South Extension area. Characterization and assessment of Sage Creek <br />overburden, Wolf Creek overburden, and Wolf Creek underburden was based on <br />chip samples collected from Monitoring Well WWCU-24, which was drilled into the <br />Wolf Creek underburden near the western boundary of the south extension area in <br />N. <br />
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