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2018-04-05_REPORT - C1982057
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2018-04-05_REPORT - C1982057
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Last modified
4/10/2018 6:33:12 AM
Creation date
4/9/2018 10:54:33 AM
Metadata
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Template:
DRMS Permit Index
Permit No
C1982057
IBM Index Class Name
Report
Doc Date
4/5/2018
Doc Name
Annual Hydrology Report
From
Seneca Coal Company
To
DRMS
Annual Report Year
2017
Permit Index Doc Type
Hydrology Report
Email Name
RAR
Media Type
D
Archive
No
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The Seneca II -W PHC predicts an annual average TDS value of 2630 mg/1 <br />for Wadge Coal Well WW14, while a value of 4790 mg/1 was observed this <br />year. This prediction was based on several assumptions. 1) Baseline <br />water quality values were an average of all Wadge coal wells at Seneca <br />II -W. 2) Aquifer characteristics were an average of all Wadge coal wells <br />at Seneca II -W. 3) The Wadge coal seam was saturated for its entire <br />thickness (11.8 feet). These assumptions, however, do not hold true for <br />Well WW14. Prior to mining in the north area (November 1992), this well <br />was almost always dry (see the 1993 AHR for a complete listing of <br />earlier water level data). Since this particular portion of the Wadge <br />seam was dry prior to mining, spoils water will now contribute much of <br />the water present. In addition, the average water level this year, 9.69 <br />feet, indicates that additional strata are being saturated, which may <br />also explain the elevated TDS value. <br />Agricultural ground water standards were exceeded this year at certain <br />monitoring wells. Table 7 of the Seneca II -W PAP contains a section that <br />discusses the suitability of using water from the various aquifers <br />monitored at the Seneca II -W Mine for irrigation or livestock watering. <br />The discussion mentions that, prior to mining, all aquifers at the <br />Seneca II -W Mine exhibited several parameter concentrations in excess of <br />both irrigation and livestock standards, rendering them questionable <br />regarding their suitability for either irrigation or livestock. All <br />bedrock aquifers affected by mining have been determined to have <br />transmissivities less than 100 ft2/day, which would also preclude their <br />use for yielding sufficient water for irrigation, or even livestock. <br />11 <br />
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