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Figure 14b illustrates changes in conductivities at 5 of our <br />study stations during 1993. Station 11 is the Green River and <br />provides a baseline for the other stations, having low <br />conductivities for the entire year. Station 9, a ground water <br />well in the northern portion of the study area has high <br />conductivities for the entire year. The other stations, 1, 3, <br />and 5, have higher conductivities in the early summer and become <br />more similar to that of the Green River later in the summer. <br />This indicates to us that winter and late spring water contains. <br />the highest conductivities due to evaporation. The effect of the <br />Green River during flood stage appears small. However, <br />irrigation return flaws discharged from springs in July appears <br />to influence wetlands water chemistry enough to lower water <br />conductivities. This water also appears to contain low sodium <br />and low selenium. The drop in water conductivity at station 3 <br />mimics the rise in water levels at this station as shown in <br />Figure 10. <br />9000 <br />8000 <br />7000 <br />N <br />~ 6000 <br />~ 5000 <br />>- <br />~- <br />4000 <br />Z 3000 - <br />0 <br />v <br />2000- <br />1000- <br />0 <br />31-May <br />WATER CONDUCTIVITY uS/cm2 <br />9 FOR 5 STATIONS DURING 19 9 3 <br />1 <br />5 <br />3 <br />1 1 teen River <br />- , <br />20-Jun 10-Jul 30-Jul 19-Aug 08-Sep 28-Sep <br />Figure 14b. Conductivities for 5 stations measured in the field <br />during 1993. <br />23 <br />