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Individual monthly TDS measurements may be affected by annual changes in <br />climate (such as the lower than average precipitation noted the past <br />several years), and by the relative contribution of flow values from <br />Ponds 002 and 003 (as affected by the truck wash system). <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 />year, historic flow measurements, and a LOWESS plot of EC (electrical <br />conductivity, corrected to 25° C, since 10/1/89) values, and finally a <br />listing of historic percent milliequivalent values for major ions and <br />TDS values. In addition, a flow hydrograph is provided for Spoil Spring <br />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 />1997. Its EC plot indicates a decreasing trend. Spoil Spring Z 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 />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 />PeaCoCo Pond) issues out of another old mine pit north of Spoil Spring <br />3. It displays a decreasing EC trend. All these springs eventually <br />flow into the Wadge Impoundment via Little Grassy Creek. Spoil Spring 7 <br />existed at the upper end of the Wadge Impoundment until the summer of <br />2002, when regrading of the pond shoreline buried this spring. A spring <br />reappeared in this area in 2003, and monitoring has resumed. Its EC <br />. plot displayed an increasing EC trend, <br />19 <br />