2012-04-27_REPORT - C2009087 (2)

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plot is generated by a method known as LOWESS (LOcally WEighted Scatterplot Smoothing). Unless otherwise noted, a smoothness factor (SF) of 1.0 (on a scale of 0 to 1) was used, which results in maximum "smoothing ". - Alluvium. Two wells are sampled in the Grassy Creek alluvium. Well 71 monitors the alluvium upstream of mining at Seneca II. It recently displays a stable TDS trend (SF 0.5). Well 70 monitors the alluvium below Seneca II (and the PSCM) and also downstream of the confluence with Scotchmans Gulch. It recently displays a stable TDS trend (SF 0.5); with the peak TDS value occurred in 2005. In the Cow Camp Creek alluvium (below NPDES 004 Pond), water quality is measured at one well. Well 69 displays a decreasing TDS trend since October 2004. - Wadge Overburden. Five wells are used to monitor the water quality in this stratum. Well 42, located in the south central part of the permit area, usually does not have enough water in its casing to sample, but did have enough water the last four years. It displays an increasing trend. Wells COV23, COV2633 and COV2702 were first sampled in 2008. Well COV11 was first sampled in May 2011. Not enough data has been collected so far to determine TDS trends. - Wadge Coal. Five wells are used to monitor the water quality of this seam. Well 17 is located just west of NPDES Pond 002. It displays a slightly increasing TDS trend. Well 19 is located a little over a mile upstream of NPDES Pond 002. It displays a decreasing TDS trend. Wells CW23, CW2632 and CW2701 were first sampled in 2008. Not enough data has been collected so far to determine TDS trends. - Trout Creek Sandstone. Well 5 was used as the potable water supply for the PSCM. Due to a change in land ownership, and following loss of electrical power, a sample was not collected 2009. Peabody Energy has since regained ownership of this property, and was able to sample this 5