2016-08-25_REPORT - C2009087 - Laserfiche WebLink

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Peabody Sage Creek Mining, LLC Page 10 8/25/2016 • SSP27 exceeded the Manganese standard in both May and September 2015. • SSP61 exceeded the Cadmium standard in September of 2015. • SSP61 exceeded the Lead standard in September of 2015. • SSP61 exceeded the Manganese standard in both May and September 2015. • SSP62 exceeded the Manganese standard in both May and September 2015. Discussion: Eight groundwater wells exceeded the pH standard (8.5) in 2015. The baseline water quality for pH associated with seven of the eight groundwater wells exceeded the 8.5 standard. Well COV 11 exceeded the pH standard however, the Division could not locate the baseline water data for this well. Other wells completed in the Wadge Overburden similar to COV 11 exceeded the pH standard. Six groundwater wells exceeded the Manganese standard (0.2 mg/1) in 2015. As mentioned in item number 8 above, in soils with a high pH a standard of 10 mg/l would be more appropriate than the 0.2 mg/1. In 2015 no PSCM wells displayed a value higher than 6.93 mg/1. Three wells exceeded the Fluoride standard (2.0 mg/1). According to the 2015 AHR, elevated Fluoride levels may be attributed to natural conditions as elevated Fluoride levels were not observed in the PSCM spoil wells and the wells that have elevated levels in 2015 have had historically high levels. The Cadmium and Lead standards were exceeded in the spoil wells SSP27 and SSP61. There was no discussion of these exceedances in the 2015 AHR. For Spoil Well SSP27, the baseline data indicates elevated Cadmium and Lead levels for this site. The Division could not located baseline data for Well SSP61 in the PSCM permit, however based on the 2008 AHR submitted for the Seneca II Mine, this site has experienced elevated Cadmium and Lead levels prior to the approval of the PSCM permit.