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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 4058 <br />mg /1 (3768 in 2011), and it TDS trend is decreasing (see above). At Site <br />YSG5 this year, the average TDS was 3197 mg /1 (2150 in 2011). TDS values <br />were higher this year compared to last year, due to the drought that <br />occurred this year. <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 hydrograph of historic flow measurements and a <br />LOWESS plot of TDS values. <br />- Spoil Springs 1 and 2. Both these spoil springs are located above <br />the NPDES 004 Pond. Spoil Spring 1 is a large spring that was further <br />developed and fitted with a V -notch weir by the USGS on September 8, <br />1987. Its TDS plot indicates a stable trend (SF = 0.5), with the peak <br />TDS value occurring in 2005. Spoil Spring 2 is a small spring creek on <br />reclaimed land that flows adjacent to Spoil Spring 1. Spoil Spring 2 <br />exhibits a decreasing TDS trend. <br />- Spoil Springs 3, 4, 5, and 7. These springs all exist in the Wadge <br />coal seam mining area in the Little Grassy Creek basin. Spoil Spring 3 <br />drains out of an old backfilled mine pit, and exhibits a decreasing TDS <br />trend. Spoil Spring 4 is a spring creek adjacent to Spoil Spring 3 and <br />exhibits a stable TDS trend. Spoil Spring 5 (also known as the Pecoco <br />Pond) issues out of another old mine pit north of Spoil Spring 3. It <br />displays a decreasing TDS trend. All these springs eventually flow into <br />the Wadge Impoundment via Little Grassy Creek. <br />Spoil Spring 7 existed at the upper end of the Wadge Impoundment until <br />the summer of 2002, when regrading of the pond shoreline buried this <br />spring. A spring reappeared in this area in 2003, and monitoring was <br />resumed. This site no longer exists due to the construction of the Lower <br />15 <br />