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plot Smoothing) . Unless otherwise noted, a smoothness factor (SF) of 1 <br />(on a scale of 0 to 1) was used, which gives maximum smoothing. A <br />statistical report representing baseline (i.e., pre - mining) data for <br />each well (when available) is presented in Appendix D1 of the 2010 AHR. <br />On this statistics report, "censored data" refers to analytical values <br />that were below the detection limit, which were censored from the <br />min /max /mean calculations. The time frame for baseline conditions is <br />listed under "conditions specified" at the bottom of each page. <br />- Alluvium. One well currently monitors the Hubberson Gulch alluvium. <br />Well WHAL7 -2 exists on Hubberson Gulch downstream of mine discharges <br />from NPDES 006, 016 and 017. Its TDS plot shows a recent stable trend <br />(SF 0.5), with values generally decreasing since May 2005. A discussion <br />of water quality from Dry Creek Alluvial Well DCAL -02 will be found in <br />the follow Ground Water Point of Compliance Section. <br />- Wadge Overburden. Three wells monitor the Wadge overburden. North <br />area Well WOV14 exhibits an increasing TDS trend. Middle area Well WOV17 <br />overall exhibits a decreasing TDS trend, but with an unusually high <br />values in 2008, 2009 and 2011. South area Well WOV25 was drilled in <br />September 2004. It displays a decreasing TDS trend. <br />- Wadge Coal. Three wells monitor the Wadge coal seam. North area Well <br />WW14 exhibits an increasing TDS trend. Middle area Well WW17 exhibits a <br />nearly level TDS trend. South area Well WW25 was drilled in September <br />2004. TDS values at this well display an increasing trend. <br />- Sage Creek Overburden. This unit exits between the Wadge and Wolf <br />Creek coal seam. Mining of the Sage Creek coal seam began in September <br />2003. Well WSOV24 was drilled in August 2001 in the II -W South area. <br />Only five samples were collected until this well failed due to a <br />landslide that occurred in April 2003. A replacement well, WSOV25, was <br />drilled in September 2004. TDS values at this well displayed a stable <br />trend; however, an elevated spike (1180 mg /1) occurred last year. All <br />previous values have been below B00 mg /l; this year's value was 660 <br />mg /1. <br />4 <br />