Laserfiche WebLink
representing baseline (i.e., premining) data for each well (when <br />available) is presented in Appendix Dl. On this statistics report, <br />"censored data" refers to analytical values that were below the <br />detection limit, which were censored from the min/max/mean calculations. <br />The time frame for baseline conditions is listed under "conditions <br />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 area <br />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 and 2009. South area Well WOV25 was drilled in September <br />2004. It displays an increasing 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 display a decreasing <br />trend from 2007's value. All values have been below 800 mg/1. <br />- Sage Creek Coal. Mining of the Sage Creek coal seam began in September <br />. 2003. Well WSC24 was drilled in August 2001 in the II-W South area. Only <br />five samples were collected until this well failed due to a landslide <br />5