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<br />Table 6. Water characteristics at key return drains from the Grand <br />Valley Irrigation System (U.S. Bureau of Reclamation, 1975). <br />Location <br />Palisade Labor <br />Camp <br />Opposite Connected <br />Lakes <br />Grand Valley 170 <br />Lower 100 yds. <br />Mean Tem. Av. <br />Flow (c.f.s.) Total Dissolved Solids (p.p.m.) of <br />low Mean High Low Mean High F. pH <br />0.7 1.0 1.3 2,799 3,122 3,312 56 7.52 <br />2.2 34.1 66.0 789 2,042 4,193 <br />Persigo Wash, <br />Grand Valley 200 3.5 36.9 84.0 <br />Upper Mack Wash <br />Grand Valley 278.5 1.5 32.5 190.0 <br />751 2,320 5,064 <br />641 2,241 3,563 <br />55 7.79 <br />55 7.80 <br />59 7.89 <br />(25)