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- 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 />- 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 Scotchman's Gulch (Yoast Mine NPDES Pond 010). Review of <br />the TDS plot indicates a recent stable trend (SF = 0.2), with the peak <br />TDS occurring in September 2006. <br />- Surface Water Site YSG5. This site is the furthest downstream surface <br />water site in the Little Grassy, Scotchman's 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 stable 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 />on Table 2.05.6(3), page 2.05.89. The Probable Hydrological Consequences <br />(PHC) focuses on impacts caused by underground mine dewatering. As that <br />scenario has not occurred yet, the PHC predictions are not yet relevant. <br />However, on page 2.05.88, it is stated "...Pond 002 is heavily affected by <br />high-TDS water from the Seneca II spoils aquifer, and averages nearly <br />4000 mg/1". This year, the average TDS at Pond 002 (NPDES2) was 3962 <br />mg/1, and it TDS trend appears to have stabilized (see above). At Site <br />YSG5 this year, the average TDS was 3073 mg/l. <br />Springs. <br /> Spoil spring data may be found after the surface water data presented in <br /> Appendix D. Spoil spring data provided are water quality data for the <br /> past three years, a LOWESS plot of TDS values, historic flow <br />15