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2014-09-18_REVISION - C1980005
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2014-09-18_REVISION - C1980005
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Entry Properties
Last modified
8/24/2016 5:47:52 PM
Creation date
9/18/2014 9:17:45 AM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1980005
IBM Index Class Name
Revision
Doc Date
9/18/2014
Doc Name
Termination of Water Monitoring Program (Memo)
From
DRMS
To
File
Type & Sequence
TR53
Email Name
JDM
DIH
Media Type
D
Archive
No
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INTEROFFICE MEMORANDUM <br />TO: FILE, TR -53 TERMINATION OF WATER MONITORING PROGRAM, C- 1980 -005, SENECA COAL <br />COMPANY, SENECA II MINE <br />SUBJECT: REVIEW OF PHC AND DEMONSTRATION THAT WATER QUALITIES AND QUANTITIES OF RUNOFF <br />WITHOUT TREATMENT ARE CONSISTANT WITH THE REQUIREMENTS OF 4.05, IN ACCORDANCE <br />WITH 4.05.13(3)(b) <br />DATE: 09/17/2014 <br />The proposed termination of ground water and surface water monitoring at the Seneca II Mine is <br />warranted, based on the following observations. If final bond release is delayed, the operator <br />may be required to resume at water monitoring. <br />Basic Standards Interim Narrative Standard for Ground Water (CWQCC Regulation <br />41.5(c) (6)) <br />The Seneca II Mine Permit alluvial ground water point of compliance ( GWPOC) is well <br />SFAL72, located in the Fish Creek alluvium less than one mile downstream for the Bond Creek <br />confluence with Fish Creek. A review of the statistical summary of the water quality of SFAL72 <br />was completed based on water quality data presented in the Annual Hydrology Reports for the <br />Seneca II Mine. Well SFAL72 was permitted as the GWPOC in Technical Revision No. 47 (TR- <br />47) approved in 2009. Based on the data collected, ambient values for SFAL72 were found to be <br />higher than the Reg. 41 standards for iron, manganese, nitrate, and sulfates. For the past three <br />years (2011 to 2013) the only standard that was exceeded was iron (0.35 mg /1, dissolved) with <br />values ranging between 2.88 and 5.16 mg /l. However, total recoverable iron values, which <br />should be greater than or equal to total dissolved values, for the last three years upstream at all <br />spoil springs (SSSPG9, .28 mg /1) and NPDES discharge (NPDES8, .31 mg /1) were less than .32 <br />mg/l. Therefore, the high iron values observed at Well SFAL72 are not likely to be the result of <br />discharges from the Seneca II Mine. <br />The Seneca II Mine does not have a groundwater point of compliance for ground water in <br />bedrock stratigraphic units, based on the absence of the potential for the mine to negatively <br />impact the quality of bedrock ground water. Based on the decision of TR -47, the low hydraulic <br />conductivities of the of the bedrock units and confining layers isolate mine - impacted water <br />bearing units from the nearest usable aquifer, the Trout Creek Sandstone, which lies <br />approximately 300 to 400 feet below the Wadge Coal seam and approximately 60 to 100 feet <br />below the Wolf Creek Coal seam. <br />
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