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1982. Discharge volumes at the this site have also been affected by the <br />reduction in diameter of the discharge culvert (36 inches to 6 inches) <br />that occurred on July 19, 1988. A smaller volume pump and line from Pond <br />002 to the truck wash was installed in August 2001. The truck wash was <br />last used in 2007. These pump lines, which were siphoning water out of <br />Pond 002, were capped off on July 7, 2010. <br />This year's average flow value, 0.047 cfs, is 28% of the historic (1980- <br />2010) average flow value, 0.167 cfs. This year's below average value is <br />due to retirement of the truck wash system. Review of the TDS plot <br />indicates a decreasing trend, with the peak value occurring in September <br />2002. <br />- Surface Water Site SW -S2 -3 (SSG3). This site monitors discharges from <br />pre -SMCRA mining areas before they enter Grassy Creek at a point just <br />below Site SSG2. Monitoring at this site was re- established in June <br />1997. This site often dries up in late summer, but was flowing from <br />April through September this year. Review of the TDS plot indicates a <br />decreasing trend. Monitoring at this site is not a PSCM requirement, <br />therefore, only field parameters were collected and no flow measurements <br />were made. <br />- Surface Water Site SW -S2 -2 (SSG2). This site exists on Grassy Creek <br />downstream of discharges from PSCM Ponds 002 and 003, but upstream of <br />Site SSG3 and Scotchmans Gulch (Yoast Mine NPDES Pond 010) . Review of <br />the TDS plot indicates a recent stable trend (SF 0.2), with the peak TDS <br />occurring in September 2006. <br />- Surface Water Site YSG5. This site is the furthest downstream surface <br />water site in the Little Grassy, Scotchmans Gulch and Grassy Creek <br />drainages after exiting the PSCM permit area. Therefore, it is the most <br />significant monitoring site with respect to showing the cumulative <br />effects of mining in this area. It displays a decreasing TDS trend. <br />The PSCM PAP addresses potential impacts to surface water quality on <br />pages 2.05 -84 to 91 (Vol. 1A) . A summary of those impacts is presented <br />14 <br />