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Wells S35-WC and S37-WC were used to monitor water levels until 199b, but have <br />been abandoned. <br />Historic data show that water in the Wolf Creek Coal is a calcium sulfate type with <br />an average TDS of 745 mg/1. <br />Wadge Coal and Overburden <br />The Wadge Overburden is considered to be an aquifer in this area and for purposes <br />of this discussion, is collectively grouped with the Wadge Coal aquifer. Four wells <br />monitor the Wadge Coal seam and overburden, and two of the wells are in hydraulic <br />communication with the Wadge Impoundment. Three wells remain in what is <br />referred to as the Wadge Lennox interburden. These wells exhibit normal seasonal <br />variations. <br />Aquifer tests performed in the Wadge Coa] seam indicate that the Wadge aquifer <br />exhibits asemi-confined condition with a transmissivity value of 377.1 gallons per <br />day per foot (gpd/ft). Wadge water levels, dependent upon well proximity to the <br />recharge area, show some seasonal variation. <br />Alluvium <br />There aze three alluvial aquifer systems within the Seneca II permit azea: the Grassy <br />Creek alluvial aquifer, the Cow Camp Creek alluvial aquifer system (drainage from <br />below 004 pond to Fish Creek), and the Bond Creek alluvial aquifer (drainage from <br />below 008 pond to Fish Creek}. The Fish Creek alluvial aquifer is not within the <br />Seneca II permit azea, but maybe affected by water discharging from the permit <br />area. <br />Nine wells aze used to monitor alluvial water quality in the drainages. Two wells <br />aze located along Cow Camp Creek, one along Bond Creek, two along Grassy Creek <br />and four along Little Grassy Creek. All of these wells exhibit seasonal vaziations. <br />The Grassy Creek alluvial system is down gradient of mining and the wells were <br />constructed after mining in the Grassy Creek drainage. Progressing downstream, the <br />little Grassy Creek alluvial aquifer becomes increasingly affected by spoils water <br />dischazge. <br />Spoils <br />The resaturation of portions of the backfilled pits has been expressed as spoil <br />aquifers. Water percolates through the replaced spoil material and flows <br />down-gradient until it reaches the lower-most highwall where the infiltration rate <br />into bedrock is much lower than flow through the spoil. When the elevation head of <br />the spoil aquifer exceeds the ground surface elevation, the spoil water discharges in <br />the form of springs at the topographically lowest point along the reclaimed highwall. <br />19 <br />