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• falls of 1987 through 1990. A 1985 analysis shows this water to be a Mg-504 type with an <br />extremely high TDS value of 14,200 mg/l. This high TDS value can be attributed to <br />localized geochemical conditions and not to mining impacts. In May, 1992, this springs <br />flow was too low to warrant a lab sample (0.37 gpm); however, an electrical conductivity <br />corrected to 25° C (EC 25°C) measurement of 8,660 umho/cm was observed. <br />Spoil Springs #1 and 2. Both these spoils springs ere located above the NPDES 004 pond. <br />Spoils Spring #1 is a Large spring that flows directly into the pond, end Spoils Spring #2 <br />is a smell spring creek in reclaimed lend that flows adjacent to Spoils Spring #1. In <br />May, 1992, Spoils Spring #2 had an EC 25°C of 4,460 umho/cm, a pH of 8.18, and a flow of <br />13.9 gpm. Starting in 1990, this and most other spoil springs were monitored annually in <br />the spring (usually May) instead of during the fall (usually September). <br />Voter quality and hydrograph data for Spoils Spring #1 may be found in Appendix E. Review <br />of this hydrograph indicates higher flows the past five years. This is primarily due to <br />the enlargement of the spring with a backhoe for the installation of a weir plate by PCC <br />and USGS personnel beginning September 9, 1987. Flow increases may also be attributed to <br />• an increase in the spoils recharge area as mining of the Vadge coal seam proceeds to the <br />north. This spring displays a CeMg-S04 type water. TDS values (see Table 18, Appendix A) <br />have been increasing since this spring began flowing. This is due primarily to an ever <br />increasing recharge area of spoils material es mining progresses. Lower than normal <br />snowmelt runoff since 1987 may have also caused an increase in TDS values. <br />Spoils Springs #3, 4, 5, 7 and 8. These springs ell exist in the Vadge seam mining area <br />in the Little Grassy Creek basin. Spoils Springs #3 end 4 were sampled May 15, 1992. <br />Spoils Spring #3 drains out of en old mine pit, end exhibited a flow of 18.4 gpm, an EC <br />25°C of 4,040 umho/cm, and a pH of 7.16. Spoils Spring #4 is a spring adjacent to Spoils <br />Spring #3 and exhibited a flow of 5.8 gpm with an EC 25°C of 3,780 umho/cm and a pN of <br />7.94. Spoils Spring #5 issues out of another old mine pit north of Spoils Spring #3. <br />Spoil Spring #5 was sampled on May 27, 1992. It had a flow of 27.4 gpm, an EC 25°C of <br />3,560 umhos/cm, and a pH of 8.07. All these springs eventually flow into the Vadge <br />Impoundment via Little Grassy Creek. <br />Spoils Spring #7 was noted in 1986 in the secondary drainage flowing into the wadge <br />• Impoundment ([he primary drainage being Little Grassy Creek). It was not flowing when the <br />site was visited in September, 1987, 1988, and 1989, or in April, 1990. On May 14, 1991, <br />21 <br />