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32 Surface water <br />l <br />SPRC -03 is located on the flat, broad valley bottom below the road that climbs out of <br />Collom Gulch to the west (Appendix 4.D). The spring emerges as a large saturated <br />zone with several areas of standing water. Flow estimates from the entire area were not <br />made due to snow cover. However, on December 2, 2004, discharge was estimated as <br />less than 0.2 gpm based on the time required to fill a pit used to collect the sample. <br />Although the spring exits from an extensive valley fill, the source is most likely bedrock <br />outcrop across the road to the west and upgradient of the spring. <br />The large saturated area from which the springs emerge eventually forms small braided <br />streams that merge and become incised. The smaller streams continue to merge and <br />eventually discharge into the incised stream channel of Lower Collom Gulch. <br />SPRC -04 is located just south of the synclinal axis on the eastern side of the incised <br />channel near the base of a hill (Appendix 4.D). The spring emerges as a large saturated <br />zone with several areas of standing water. Flow estimates for the entire area could not <br />be made due to snow cover. However, on December 2, 2004, discharge was estimated <br />at less than 1 gpm based on the time required to fill the pit used for sample collection. <br />Although the spring exits from shallow valley fill, the source is most likely from bedrock <br />outcrop upgradient and on the eastern slope of valley. <br />4.5.4 Straight Gulch Spring <br />One spring was sampled in Straight Gulch, SPRS -01, at the base of the eastern slope of <br />Straight Gulch (Appendix 4.D). On December 2, 2004, discharge was visually estimated <br />at less than 10 gpm. The spring is undeveloped. The spring emerges from shallow <br />valley fill, although the source is likely from bedrock outcrops upgradient of the location. <br />This spring was previously identified in the JBR report and is considered to be perennial. <br />4.6 Spring water quality <br />Spring and seep data, and samples for water quality analyses were collected from the <br />locations described above in December 2004. Analytical results from the springs and <br />seeps are presented in Appendix 4.C. A summary of analytical results is presented in <br />Table 4.4. Table 4.4 also includes the Federal MCLs, which are used in Colorado as <br />primary and secondary drinking water quality criteria. Although these MCLs are not <br />specifically applicable, they provide a basis for comparison. All spring and seep water <br />samples, except those from SPRLC -03 and SPRJ -01, exceeded the secondary drinking <br />water MCL for TDS of 500 mg /I. Other location specific exceedances are listed below. <br />The inorganic chemistry of the major ions, illustrated on a trilinear diagram (Figure 4.4), <br />varied widely based on location and apparent provenance, as discussed below. <br />Water from Jubb Creek spring SPRJ -01 is a calcium /magnesium- bicarbonate solution <br />with a TDS of 390 and a pH of 7.99. Farther downstream, spring SPRJ -02 produces a <br />magnesium - sulfate water with a TDS of 1,720 and pH of 7.18 <br />2572 -R2 Colowyo Coal Company <br />Water Management Consultants <br />