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• it is the most significant monitoring site with respect to showing the cumulative ef.f acts <br />of mining in this area. Review of the hydrograph of monthly flow measurements again shows <br />for this year, the highest peak flow since 1986. <br />Water at this site is a MgCa-504 type. Table 17 shows that the 1993 average TDS value of <br />2888 mg/l is the highest on record. This is likely highly influenced by the higher TDS <br />flows from NPDES 002 during July through early September of 1993. <br />Sorinos. <br />Springs #1, 2 and 3. These springs all exist close to the north permit boundary. Review <br />of Table 18 shows Spring #1 has a CaMg-HC03SO4 type water with a TDS value of 1,156 mg/l <br />in 1993. During 1993, Spring #2 exhibited a CaM g-804 type water and a TDS value of 1,814 <br />mg/l. Due to their location, it is unlikely that either spring is impacted by mining. <br />The last time that flow was noted at Spring #3 was in 1984 <br />Spring #5. This spring is located in the Cow Camp Creek drainage but, due to its <br />• location, is unlikely to be disturbed by mining. A 1993 sample shows this water to be a <br />Mg•S04 type with an extremely high TDS value of 8882 mg/l- This high value, however, is <br />lower than TDS measurements conducted at this spring in 1985 and 1986 (Table 18>. This <br />high TDS value can be attributed to localized geochemical conditions and not to mining <br />impacts. <br />Spoil Springs #1 and 2. Both these spoils springs are 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 small spring creek in reclaimed land that flows adjacent to Spoils Spring #1. In <br />June, 1993, Spoils Spring #2 had an EC of 4260 umh o/cm, a pN of 7.95, and a flow of 18.4 <br />gpm. <br />water quality end hydrograph data for Spoils Spring #1 may be found in Appendix E. Review <br />of this hydrograph shows [hat the highest peak flow on record occurred this year- In <br />1993, this spring displays a MgCa-504 Type water (cable 18 ). TDS values have been <br />increasing since this spring began flowing. This is due primarily to an ever increasing <br />recharge area of upgredienf spoils materiel as mining progresses. <br />• Spoils Springs #3, 4, 5, 7 end 8. These springs ell exist in the wedge seam mining area <br />in the Little Grassy Creek basin. Spoils Springs #3 and 4 were sampled June 4, 1993. <br />15 <br />