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had water quality samples with NH; excursions.. Samples from all wells monitoring the <br />Watering Trough Gulch alluvium have Cu concentrations that exceed aquatic life standards. <br />Both alluvial aquifers have monitoring sites with samples exceeding 6a and Cr standards. <br />The Wolf Creek Coal aquifer has a relatively small number of samples that exceed the <br />aquatic life standards. <br />Samples with concentrations of metals that exceed the aquatic life standards are prevalent <br />in the Wadge Coal aquifer. Levels of Cd, Cu, Fe, and Zn are the metals that most commonly <br />exceed the standards. Overall, the levels of metals, NH3, and TDS present some measure of <br />hazard for many forms of aquatic life. Based on the high number of samples with <br />excursions, ground water at Seneca II-W is unsuitable for some forms of aquatic life. <br />Irrigation Water Suitability. As can be seen in Table 7-20, all Hubberson Culch <br />monitoring wells have samples with conductivity, TDS, and Mn levels that exceed irrigation <br />water quality standards. Conductivity values that exceed the irrigation criterion also <br />are common in the other aquifers. 14a nganese ex ceedences occur in all aquifers except for <br />the Wolf Creek coal. <br />• <br />Another method of assessing the suitability of water for irrigation is to use <br />sodium-salinity hazard diagrams, where the specific conductance of a water is plotted <br />against its sodium adsorption ratio (U.S. Salinity Laboratory, 1954). Figures 7-6 through <br />7-9 are sodium-salinity hazard plots for the aquifer units at the Seneca II-W area. Both <br />the Hubberson Gulch alluvium and the Watering Trough Gulch alluvium have low sodium <br />hazards, but wells completed in the Hubberson Culch alluvium have a higher salinity hazard <br />(Figure 7-6). Well CW-52W-19A has t:he highest salinity hazard of all the alluvial wells. <br />In general, Hubberson Gulch alluvium water would have adverse effects on many crops and <br />would require careful irrigation practices, while Watering Trough Gulch water has good <br />irrigation quality and would have no detrimental effects on most crops. <br />As shown in Figure 7-7, Wadge Overburden water has a medium sodium hazard and a high <br />salinity hazard. This water is only suited for irrigating tolerant species in permeable <br />soils using careful management. Water from Wells CW-52W-150V and 170V is not suited for <br />irrigation. <br />Like the Wadge Overburden, the Wadge Coal aquifer has water that can be used to irrigate <br />only relatively tolerant plants on permeable soils (Figure 7-8). Wells GW-S2W-3W, -15W, <br />60 <br />