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Table 4 <br />Predicted Impacts of Mining on Total Dissolved Solids (TDS) <br />In the San Miguel River Below Tuttle Draw. <br />TDS values in milligrams per liter (mg /1 ), <br />Percent changes [in brackets] are from baseline TDS conditions. <br />Time Periods Flows <br />and Flow Regimes (cfs) <br />Irrigation Season 135.7 <br />Non-irrigation <br />Season <br />Means <br />Low Flow <br />Irrigation Season <br />815.6 <br />Total Dissolved Solids <br />in Operati <br />482 491 <br />C2] <br />witn rvucia anq <br />Nucla East Mines <br />in Operation3 <br />493 <br />02.47 <br />Mining4 <br />527 <br />C9.4] <br />456 <br />457 <br />[0.3] <br />599.5 <br />[1 ] <br />2009 <br />02.47 <br />360.45 592.56 <br />12.4 1961.6 <br />458 <br />[0.47 <br />599,6 <br />C1 ] <br />2021 <br />[3.0] <br />459 <br />[0.6] <br />604 <br />C2] <br />2241 <br />[14] <br />Non-irrigation 8.3 1692 1797 1815 1868 <br />Season [6,2] [7.3] [10.4] <br />1 San Miguel River above Tuttle Draw plus Site SW-N103 (Calamity Draw) plus <br />Site SW-N1 (Tuttle Draw above the Nucla Mine). <br />2 San Miguel River above Tuttle Draw plus site SW-N103 (Calamity Draw) plus <br />Site NW-3 (Tuttle Draw downstream from the Nucla Mine). <br />3 San Miguel River above Tuttle Draw plus Site SW-N103 (Calamity Draw) plus <br />Nucla East Pit dewatering projection plus Site SW-N3 (Tuttle Draw <br />downstream from the Nucla Mine). <br />4 San Miguel River above Tuttie Draw plus Site SW-N103 (Calamity Draw) plus <br />Site SW-N1 (Tuttle Draw above the Nucla Mine) plus the Nuc1a spoils <br />projection plus the Nucla East spoils projection. <br />5 Mean flow obtained from historical data compiled by Iorns (1965). <br />6 Mean TDS obtained from USGS Site 09175500 at Naturita from 1961-1981. <br />-26- <br />