Laserfiche WebLink
plot is generated by a method known as LOWESS which is an acronym from <br />Locally Weighted Scatter plot Smoothing (Cleveland, 1979).Unless <br />otherwise noted, a smoothness factor (SF) of 1.0 (on a scale of 0 to 1) <br />was used, which results in maximum "smoothing ". <br />- Alluvium. Two wells are sampled in the Grassy Creek alluvium. Well 71 <br />monitors the alluvium upstream of mining at the PSCM. It recently <br />displayed an increasing TDS trend; with the peak occurring in May 2013. <br />Well 70 monitors the alluvium below Seneca II (and the PSCM) and also <br />downstream of the confluence with Scotchmans Gulch. It recently displays <br />a stable TDS trend; with the peak TDS value occurring in October 1994. <br />In the Cow Camp Creek alluvium (below NPDES 004 Pond), water quality is <br />measured at one well. Well 69 displays a decreasing TDS trend since <br />October 2004. <br />- Wadge Overburden. Five wells are used to monitor the water quality in <br />this stratum. Well 42, located in the south central part of the permit <br />area, usually does not have enough water in its casing to sample (as was <br />the case this year), but did have enough water in 2008 -2011 and <br />displayed an increasing trend. Wells COV23, COV2633 and COV2702 were <br />first sampled in 2008. Wells 23 and 2633 indicated increasing TDS <br />trends, while Well 2702 displayed a decreasing trend. However, the range <br />of all historic TDS values, 560 to 810 mg /1, is relatively low when <br />compared to what is observed in other aquifers in the area. Well COV11 <br />was first sampled in May 2011. This well now displays a decreasing TDS <br />trend. <br />- Wadge Coal. Five wells are used to monitor the water quality of this <br />seam. Well 17 is located just west of NPDES Pond 002. It displays a <br />recent stable TDS trend (SF 0.25) ; with the peak value occurring in <br />2008. Well 19 is located a little over a mile upstream of NPDES Pond <br />002. It displays a stable TDS trend. Wells CW23, CW2632 and CW2701 were <br />first sampled in 2008. Wells 2632 and 2701 display an increasing TDS <br />trend, while Well 23 displays a decreasing TDS trend. All wells, except <br />Well 17, display TDS values between 610 and 970 mg /l. <br />A <br />