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<br />34 <br /> <br /> change in water was sampled in the same manner. The entire <br />W procedure was repeated twice using 2S0g and SOOg of weathered Mancos <br />"'-l Shale for jar tests two and three. The sampling intervals varied <br />W <br />CO <br /> according to the changes in EC, Temperatures were recorded for all <br /> samples. EC of the fresh water was less than 10 llffiho/cm at 2SoC. The <br /> <br />results are summarized in Figures 2.6 through 2.8. <br /> <br />2.2.2 Results and Discussion <br /> <br />EC increased with time as a step function with agitation; it <br /> <br />increased immediately after agitation for the first three to four <br /> <br />minutes, The EC of the sample then remained nearly constant until <br /> <br />reagitated. The increases were most significant in the dilute <br /> <br />solutions, <br /> <br />Replacing part of the high concentration water with clean water <br /> <br />significantly reduced the initial EC of the sample, However, <br /> <br />agitation increased the Be in the water more than in the original <br /> <br />sample, Most of the second and third water samples approached the <br /> <br />high Be levels of the initial sample with continued agitation, This <br /> <br />suggests that the plateau level of BC attained by the runoff in <br /> <br />hillslope studies represents incomplete dissolution (see Chapter 3), Mixing <br /> <br />high concentration runoff with more dilute flow would most likely <br /> <br />result in continued leaching of salt from the sediment, This sub- <br /> <br />stantiates results demonstrated by Laronne (1977) where dissolution of <br /> <br />sediment was found to be more complete as sediment concentration <br /> <br />decreased, <br />