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that the PHC predictions were based data from 1981 to 1986, when Site <br />SSG1 (Grassy Creek upstream of Seneca II discharges) had an average flow <br />of 2.60 cfs in June and 0.16 cfs in September. However, this year, Site <br />SSG1 had a flow of 1.42 cfs in June, and 0.01 in September. <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, historic flow measurements for the past ten years, and <br />a LOWESS plot of EC (electrical conductivity, corrected to 25° C, since <br />10/1/89) values, and finally a listing of historic percent <br />milliequivalent values for major ions and TDS values. In addition, a <br />flow hydrograph is provided for Spoil Spring 1. <br />- Spoil Springs 1 and 2. Both these spoil springs are located above the <br />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 EC plot indicates a decreasing trend. Spoil Spring 2 is a <br />small spring creek on reclaimed land that flows adjacent to Spoil Spring <br />1. Spoil Spring 2 has recently exhibited a decreasing EC 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 EC <br />trend. Spoil Spring 4 is a spring creek adjacent to Spoil Spring 3 and <br />exhibits a decreasing EC trend. Spoil Spring 5 (also known as the <br />PeCoCo Pond) issues out of another old mine pit north of Spoil Spring 3. <br />It displays a decreasing EC trend (SF = 0.5). All these springs <br />eventually flow into 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 has <br />resumed. Its EC plot recently displays a decreasing EC trend (SF = 0.5). <br />• <br />17