2013-12-06_REPORT - C1992081

• Permit No: C1992081
• IBM Index Class Name: REPORT
• Doc Date: 12/6/2013
• Doc Name: 2012 Annual Hydrology Report Review
• From: DRMS
• To: Seneca Coal Company
• Annual Report Year: 2012
• Permit Index Doc Type: Hydrology Report
• Email Name: JDM
• Email Name: DIH
• Media Type: D
• Archive: No

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September (0.09mg /1) at HGSD3. The chronic selenium
standard (4.6 ug /1) was exceeded in September at both
HGSD1 and HGSD3, with values of 4.9 and 18.9 ug /1,
respectively. Neither NPDES site was discharging at the
time of the exceedance.
10. Interim Narrative
CWQCC regulation 41.5.C.6
It was determined that groundwater points of
Standard for Ground
compliance are unwarranted at the Hayden Gulch
Water
Loadout. It was determined that any Ieachate
originating at the Loadout would likely be of better
quality than native groundwater in the Lewis Shale
which has high concentrations of dissolved solids.
11. Sampling frequency
Tab 13, p. 8 of CDRMS mining
The report indicates that all frequencies were met.
at surface water
permit C -92 -081
12. Parameters to be
Table 13 -1 of CDRMS mining
All required parameters were analyzed.
sampled at surface
permit C -92 -081
water sites
13. Filing frequency of
CDRMS regulation 4.05.9(17)
Sediment ponds associated with C- 1992 -081 include
pond reports
Ponds 001A (Truck Loop Pond) and 002A (Rail Loop
Pond). Quarterly pond inspections were conducted
within the appropriate quarter.
14. Timely filing of
CDRMS regulation 4.05.9(17)
Quarterly pond inspection reports were submitted and
pond reports
received by the Division within an appropriate
timeframe.
15. Content of pond
CDRMS regulation 4.05.9(15)
All required information was addressed on quarterly
reports
sediment pond inspection in water year 2012.
16. Sampling frequency
Tab 13, p. 10 of CDRMS mining
Dry Creek alluvial water is monitored in two wells:
of ground water
permit C -92 -081
HGDAL3 (down - gradient) and HGDAL4 (up- gradient).
monitoring wells
Monitored semi - annually
17. Parameters to be
Table 13 -2 of CDRMS mining
All required parameters were analyzed.
analyzed in ground
permit C -92 -081
water samples
18. Basic Standards for
CWQCC regulations 41.4 and
The Loadout did not generate significant amount of
Ground Water
41.5
Ieachates in 2012. Both groundwater wells exceeded
the manganese standard (0.2 mg /1) in May and
September of 2012. Groundwater well HGDAL3
exceeded the boron standard (750 ug /1) in September
(880 ug /1) 2012. CDRMS has previously determined
groundwater points of compliance are not necessary,
based on the Loadouts lack of potential impacts to
ground water quality (memo dated 6/5/08). TDS of
alluvial ground water consistently exceeds 10,000 mg /1,
indicating "Limited Use and Quality ". Leachate
originating from the Loadout would lack sufficient head