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Spoil Spring #b. This spring is the only one yet observed in the wolf Creek spoils and uas Located in 1986. On April 10, 1990, it had a floe of 68.2 gpm, an EC 25°C of 290 umhos/cm, and a pH of 6.70. By May 10, 1990, its floe had dropped to 1.5 gpm with a EC 25°C of 2,670 umhos/cm, and a pH of 6.20. Spoils Spring #9. This spring was located during 1990 in the area immediately upstream of the 008 pond. This sample site is the composite of several seeps that issue from spoils material. On April ib, 1990, it had a floe of 50.3 gpm, an EC 25°C of 1,890 umhos/cm, and a pH of 7.76. Comparison of Surface hater Quality to Water Use Standards. The CDDH has established eater quality standards for most stream segments in the state, including the Yampa River and select tributaries (CDDH, 1986). Surface eater in the Grassy Creek Basin is categorized under Segment 12 of the Yampa River, and this segment has only minimal standards established (dissolved oxygen, pH, and fecal col iforms only). Surface water in the Fish Creek Basin (Cow Camp and Bond Creeks) is categorized under Segment 13. Since Segment 12 has no standards established for major ions or trace metals, the standards established for Segment 13 (see Table 22, Appendix A) have been used to compere against surface water quality measured at the Seneca (t Nine (Grassy Creek, Fish Creek tributaries, end Fish Creek). For Segment 13 of the Yampa River, the CDDH has established a standard of .02 mg/l far un-ionized ammonia. Analyses performed by Peabody's contract laboratory for ammonia as nitrogen resulted in reported values consisting of the sum of both the ammonium ion (ionized) end ammonia (un-ionized). Because of this, it uas necessary to convert Peabody's reported ammonia concentrations to un-ionized ammonia concentrations in order to compare them against the stream standard. The table presented on Page 713 of "Standard Methods for the Examination of Neter end Yasteweter" (APHA, 7985) presents percent correction factors used to Calculate un-ionized portions of ammonia in distilled eater. Since percent correction factors for solutions with higher TDS are unavailable in the literature, percent correction factors for distilled water were applied to the ammonia values for comparison purposes. tt should be noted that the percent un-ionized ammonia decreases with increasing TDS, and resultant values calculated for un-ionized ammonia are probably higher than the true value. Also, since the aforementioned table lists pH values to every one-half of a pH unit, and temperatures for every five degrees Celcius (used to determine the correction value), only a range of un-ionized ammonia values can be calculated end compered against the Segment 13 standards. •I 20