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January 23 2013 <br />To Jared Ebert <br />From Susan Burgmaier <br />Re Yoast Mine Permit No C 1994 082 <br />2011 Annual Hydrology Report <br />Adequacy Review <br />have completed my review of Seneca Coal Company s 2011 Annual Hydrology Report <br />for the Yoast Mine In general the report was concise and thoroughly addressed the <br />information requirements of Rule 4 05 13 4 c and the approved permit application <br />package Based on my review I have the following comments <br />1 Water monitoring frequency requirements were met at all surface and <br />groundwater monitoring sites <br />2 Field parameters were collected and laboratory analyses were conducted as <br />required at all groundwater and surface water sites <br />3 Groundwater Levels Groundwater levels in overburden coal and underburden <br />wells were within historic ranges Groundwater levels were particularly high in <br />the alluvial wells for the 2011 water year due to exceptionally high snowpack and <br />heavy spring precipitation <br />4 Groundwater Quality TDS is increasing in the 30 series Wadge overburden and <br />coal wells but decreasing in the underburden A decrease in TDS was observed <br />in the Wolf Creek 33 series coal and underburden wells <br />TDS is in excess of values predicted in the Probable Hydrologic Consequences <br />PHC section of the permit application package for well YW30 Overall reported <br />water quality meets agricultural water standards with the few excursions noted <br />by SCC for pH and manganese <br />5 Alluvium SCC noted and the Division concurs that TDS levels show increasing <br />trends in the Annand Draw and Grassy Creek alluvium In the Sage Creek <br />alluvium TDS is increasing below Pond 012 but decreasing at the point furthest <br />downstream and below Ponds 013 and 014 <br />TDS is in excess of values predicted in the Probable Hydrologic Consequences <br />PHC section of the permit application package for wells YAAL14 YGAL16 <br />YSAL1 and YSAL3