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2014-12-19_REVISION - C1980005 (2)
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2014-12-19_REVISION - C1980005 (2)
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Last modified
8/24/2016 5:56:07 PM
Creation date
12/19/2014 1:53:52 PM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1980005
IBM Index Class Name
Revision
Doc Date
12/19/2014
Doc Name
Proposed Decison Findings of Complaince
From
DRMS
To
Seneca Coal Company, LLC
Type & Sequence
SL6
Email Name
JDM
DIH
Media Type
D
Archive
No
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finds that the revegetation on the Seneca II Mine reclaimed areas is capable of supporting the <br />approved post- mining land use. <br />Evaluation of Hydrologic Impacts <br />In accordance with Section 3.03.2(2), the Division has evaluated whether pollution of surface or <br />subsurface water is occurring, and the probability of future occurrence of such pollution. The <br />evaluation considered information in the following documents: the Probable Hydrologic <br />Consequences section of the permit application, Annual Hydrology Reports submitted by the <br />operator, the Division's Annual Hydrology Report review memoranda, and documents in the SL -06 <br />bond release application and file. The results of the evaluation are summarized below. <br />Basic Standards Interim Narrative Standard for Ground Water (CWQCC Regulation <br />41.5(c)(6)) <br />The Seneca II Mine alluvial ground water point of compliance ( GWPOC) is well SFAL72, located in <br />the Fish Creek alluvium less than one mile downstream from the Bond Creek confluence with Fish <br />Creek. A review of the statistical summary of the water quality of SFAL72 was completed based on <br />water quality data presented in the Annual Hydrology Reports for the Seneca II Mine. Well SFAL72 <br />was permitted as the GWPOC in Technical Revision No. 47 (TR -47) approved in 2009. Based on the <br />data collected, ambient values for SFAL72 were found to be higher than the Reg. 41 standards for <br />iron, manganese, nitrate, and sulfates. For the past three years (2011 to 2013), the only standard that <br />was exceeded was iron (0.35 mg /1, dissolved), with values ranging between 2.88 and 5.16 mg /1. <br />However, total recoverable iron values, which should be greater than or equal to total dissolved <br />values, were less than 0.32 mg/l for the last three years upstream at all spoil springs (SSSPG9, 0.28 <br />mg/1) and in the NPDES discharge (NPDES8, 0.31 mg/1). Therefore, the high iron values observed at <br />Well SFAL72 are not likely to be the result of discharges from the Seneca II Mine. <br />The Seneca II Mine does not have a groundwater point of compliance for ground water in bedrock <br />stratigraphic units, based on the absence of the potential for the mine to negatively impact the quality <br />of bedrock ground water. Based on the decision of TR -47, the low hydraulic conductivities of the <br />bedrock units and confining layers isolate mine - impacted water bearing units from the nearest usable <br />aquifer, the Trout Creek Sandstone, which lies approximately 300 to 400 feet below the Wadge Coal <br />seam and approximately 60 to 100 feet below the Wolf Creek Coal seam. <br />Instream Numeric Standards (CWQCC 33) <br />The Seneca II Mine discharges surface runoff and spoil leachate into Segment 13b (Fish Creek and <br />tributaries) of the Yampa River in CWQCC's Region 12 of the Yampa River Basin. The Seneca 11 <br />Mine is required to monitor 17 of the parameters in Segment 13b per CWQCC and CDRMS. A <br />review of the statistical summary of the water quality data provided in Seneca II Mine's Annual <br />Hydrology Reports and specifically for the past three years was conducted for the mine's NPDES <br />Outfall (NPDES8) and stream sites SSB12 (Bond Creek above the confluence with Fish Creek), <br />SSF11 (Fish Creek above the confluence with Bond Creek), and SSF13 (Fish Creek downstream of <br />
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