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u <br />of irrigation return flows on the quality of the alluvial water. Both TR-3 <br />and TR-4 are located at points where there is no indication of springs or <br />other seepages that might affect the water quality, however, TR-3 is located <br />near the western permit boundary in the Moffat Area and TR-4 is located even <br />further downstream at the northwestern edge of the Moffat Area. TR-3 is <br />probably the best indicator of the baseline quality of alluvial waters that <br />have a potential for being affected by mining in that presently undisturbed <br />area. <br />Therefore, the only wells which lend themselves for possible impact <br />analysis due t0 Current mining activities die TR-1.5 and TR-3, although in <br />using these wells it must be assumed that the stratigraphy intersected by <br />Trout Creek and its associated alluvium is the same which is not the case. <br />This is evidenced by the outcropping of the Waage Coal Seam at the northern <br />end of the Moffat Area east of Trout Creek while in the west Ridge Area the <br />Waage Coal Seam is continuous beneath Trout Creek. <br />• Total Dissolved Solids (TDS) fall into two major groups at the Edna Mine <br />(Figure 18). One group (TR-1, TR-2 and WR-1) have TDS concentrations above <br />1000 mg/1 with few exceptions while the remaining wells (TR-1.5, TR-3 and <br />TR-9) have TDS concentrations consistently below 1000 mg/1 with only two <br />exceptions, one for TR-3 and one for TR-4 during 1982. This is not unexpected <br />inlight of the wells locations as previously discussed. However, it is <br />interesting that TDS levels in the spoils well resemble TDS levels found in <br />alluvium reflecting irrigation return flow. Electrical conductivity (Figure <br />18) also follows the same trend shown in TDS, as expected. <br />Calcium (Ca) is the major cation found in all the wells with lower <br />concentrations of magnesium (Mg) and sodium (Na) occurring in lesser <br />quantities (Figures 19 and 20). These cations exhibit the same trend found in <br />the TDS concentrations with the wells falling into two basic groups. Also, as <br />expressed by the TDS levels, TR-1.5 generally contains the lowest <br />concentrations of cations with a slight increase occurring downstream with <br /> higher concentrations occurring at TR-3 and TR-4. TR-2 appears to exhibit a <br /> trend relating more to seasonal use of irrigation water with higher values <br /> <br />