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commonly exceeded et Springs YSPG3, YSPG4, YSPG6, end YSPG7. The comparison of spring • <br />water quality with the agricultural standards indicates Yoast springs ere not suitable for <br />irrigation purposes. <br />The previously introduced sodium-salinity hazard diagram (Figure 7.1, see "Ground Water <br />Suitability") includes a point plotted that represents the mean values for both SAR end <br />specific conductance (EC) determined for ell springs monitored et the Yoast mining area <br />(point number 10). Tfie mean SAR lEC value for springs plotted on the diagram is classified <br />es a high salinity/low sodium water. The diagram indicates water discharged from <br />monitored springs at the Yoast mining area cannot be used on soils with restricted <br />drainage, end if used on adequately draining soils, special management for salinity <br />control may be required. In addition, Figure 7-1 indicates this low sodium water from the <br />springs can be used for irrigation on almost all soils without developing harmful levels <br />of exchangeable sodium. <br />Livestock Water Suitability. Table 7-23 lists livestock drinking water standards <br />recommended by the Colorado Department of Health (CDOH, 1994), or other agencies. The <br />standards were compared against concentrations of spring sample constituents on a spring • <br />site basis. The following trace metals listed on Table 7-23 were compared against total <br />recoverable metal concentret ions analyzed in samples Collected at each spring: Al, <br />As, Cd, Cr, Cu, Pb, Xg, Se, end 2n: <br />The comparison resulted in finding no exteedences of any livestock standard listed on <br />Table 7-23 for spring water chemistry. Bes ed on these comparisons, ell water discharged <br />from monitored springs at the Yoast mining area is suitable for livestock use. <br />Recional Surface Water Characteristics <br />The Yoast Mine is drained principally by Sege Creek to the west and by Grassy Creek to the <br />east (see Exhibit 16-1 Tab 16, Protection of the Hydrologic Balance). Both creeks ere <br />perennial tributaries of the Yampa River which in turn flows into the Green River and <br />finally into the Colorado River. These river systems are expl eined thoroughly in Iorns' <br />et. al. (1965) USGS Professional Paper, Water Resources of the Uooer Colorado River <br />Besi n-Technical Report. <br />In this report, these river drainages are placed in the Green Division of the Upper • <br />Colorado River Basin end in the subdivision comprised of the Tampa River Basin. Because <br />az <br />