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Figure 13 presents data on conductivity at several times <br />during the sample period for selected stations. Most of the <br />stations-have lower conductivities at the end of the summer than <br />at the beginning of the summer. This is most likely due to <br />Gunnison River water infiltrating soils and influencing these <br />sites, or off-site irrigation return flows or other waters of <br />lower salt content affecting these sites. Interestingly, most <br />sites end up having conductivities of 3,000 to 8,000 µS cm z. <br />The dilution of ground waters late in the summer may not be due <br />to Gunnison River water as the tinning is not correct. In <br />addition, the conductivity of station 6 waters lowers to match <br />that of station 3 indicating that irrigation return flows from <br />the north may be controlling the chemistry of these waters. <br />30- <br />25~ <br />N <br />~ 20~ <br />~ N <br />~ ~ <br />~ ° 15~ <br />~- ~' <br />j o <br />f=- -~ <br />U <br />0 10~~ <br />0 <br />U <br />5 <br />fl <br />2 0 -Jun <br />CONDUCTIVITY OF GROUND <br />AND SURFACE WATERS <br />cE-s ON THE NORTH SIDE OF THE <br />GUNNISON RIVER <br />ESCALANTE STATE <br />WILDLIFE AREA <br />CE-1 <br />CE- <br />E-4 <br />CE-5 <br />CE-10 ' <br />10-Jul 30-Jul 19-Aug 08-Sep 28-Sep 18-Oct 07-Nov <br />Figure 13. Conductivity (µS cm'Z) for selected stations during <br />the sample season. <br />20 <br />