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<br />salt) near St. George - Infiltration Loss + Littlefield Springs <br />Flow (and salt) + the Intervening Flow (and salt) between near <br />St. George and the Virgin River at Littlefield. <br /> <br />This analysis assumes that any reduction in salt loading at <br />the Littlefield gage would be fully realized at Lake Mead. <br />The travel time between Littlefield Springs and the Imperial <br />Dam was estimated, for the economic analysis, to be 4 years. <br /> <br />VI. SALT PICKUP OF INFILTRATION LOSS BEFORE IT EMERGES <br />AS LITTLEFIELD SPRINGS <br /> <br />Assume that the 60ft3/sec Infiltration Loss near Bloomington, Utah, is the <br />source of Littlefield Springs. <br /> <br />Littlefield Springs flow has a quality of 2920 mg/L total dissolved solids <br />(TDS). The infiltration loss, assumed to be the source of the Littlefield <br />Springs flow, has a qual ity of 2133 mg/L TDS. This impl ies that this water <br />.picks up. 787 mg/L TDS of salt underground. <br /> <br />Investigation during the previous study (USSR, February 1979) revealed the <br />Littlefield Springs flow to be saturated with respect to calcite. To assess the <br />salt pickup that would occur if the water lost to infiltration was improved in <br />quality (due to the La Verkin Springs project), the following assumptions were <br />cons i dered: <br /> <br />A. The salt pickup, in mg/L, for each major ion would remain constant, <br />except for Ca and HC03. <br /> <br />S. <br /> <br />Calcite is considered as Ca + HCO. These ions rer.ain at the sar,IC <br />concentration 1n the Littlefield ~prings fiow and are assumed to <br />be at saturation. <br /> <br />C. TherE would be no effect on the Littlef1elc Springs fluv: for a <br />minimum of 22 years (the calculated travel time through the <br />underground system as presented in previous investigations (USSR, <br />February 1979; Trudeau, August 1979)). <br /> <br />Table 4 de~onstrates how the salt picku~ ~dS Calculated. Table 6 <br />de~onstrates how thlS salt pickur V:d, usee tu determine the effect <br />rec.:.,ving La VerK1n Springs wou"ld hctve on tne Littlef1eld Sprir,ss <br />flow. <br /> <br />The result of this analysis is that if the La Verkin Springs are <br />fully_diverted, the iffiproved quality of water lost to infiltration <br />(6Uftj/sec) would pick up 914 mg/L TDS between near Bloomington, <br />Utah and reemergence as Littlefield Springs, AZ. While this is a <br />greater salt pickup than the present systen (787 mg/L), the resulting <br />quality of Littlefield Springs would be a 547 mg/L improvement over <br />present. This is due to an improvement irl the quality of thE water lost <br />to infiltration from 2133 mg/L to 1459 mg/L resulting from the removal <br />of La Verkin Springs. <br /> <br />9 <br /> <br />002623 <br />