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REP16418
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REP16418
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Last modified
8/24/2016 11:45:43 PM
Creation date
11/27/2007 1:51:58 AM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1982057
IBM Index Class Name
Report
Doc Date
3/20/2006
Doc Name
2005 Annual Hydrology Report Letter to Appendix C
From
Seneca Coal Company
To
DMG
Annual Report Year
2005
Permit Index Doc Type
Hydrology Report
Media Type
D
Archive
No
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appropriate standard would be 10 mg/1 (EPA, 1976) . This year, none of <br />the Seneca II-W wells displayed a value higher than 3.08 mg/l. <br />One well, WW14, exhibited boron values, 1050 and 1080 ug/1, which <br />exceeded the CDOH standard of 750 ug/l. According to the CDOH, the 750 <br />ug/1 standard is set for sensitive crops (CDOH, Reg. 41, 1999), and that <br />the limit otherwise is 5000 ug/1. None of these sensitive plant species <br />are grown commercially in this area. <br />At the Seneca ZI-W shop well, Well 201TC, CDOH drinking water standards <br />were used to determine its suitability. No human health standards were <br />exceeded. The secondary standard for iron (0.3 mg/1) was exceeded with <br />values of 6.27 and 6.92 mg/1. The secondary standard for manganese (0.05 <br />mg/1) was exceeded with values of 0.115 and 0.124 mg/1. However, bottled ~ <br />water is consumed at Seneca II-W. Also, since the aquifer for the shop <br />well (Trout Creek Sandstone) starts at 280 feet below the Wadge Coal and <br />is separated by confining shale layers, water from this well should not <br />be affected by mining and, therefore, reflects the natural <br />characteristics of the aquifer. <br />Ground Water Quality Summary. Increasing TDS trends are beginning to be <br />observed at most wells downgradient of mining. However, five <br />downgradient wells, WHAL6-2, WSAL14, WOV17, WW14 and WW17, exhibit <br />stable or decreasing TDS trends. TDS values this year were below PHC <br />predicted values for all wells except for WHAL7-2, WOV17 and WW14. <br />Agricultural ground water standards were exceeded this year at certain <br />monitoring wells. Tab 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 all aquifers prior to mining at the Seneca <br />II-W Mine have exhibited several parameter concentrations in excess of <br />both irrigation and livestock standards compared, rendering them <br />questionable regarding their suitability for either irrigation or <br />livestock. All bedrock aquifers affected by mining have been determined • <br />to have transmissivities less than 100 ft2/day, which would also <br />I2 <br />
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