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1 batch method the base level must be deCermined by other means ouch as a <br />2 leach test or multiple batches on the same sample. <br />3 Successive dilutions such as those represented in Fig. 5 can also <br />4 give an indication of the base level of solution by observing the slope <br />5 of the linear portion of the curve beyond the 1:2 ratio. <br />g In conclusion the following guidelines are suggested for <br />7 determining total dissolved solids based on the data above: <br />g 1. The concentration of salts in a seep from a disturbed area cannot <br />g easily be predicted unless i[ is being controlled by the calcium, <br />lp magnesium ratio in the presence of gypsum. <br />11 2. The concentration of salts in the leachwater of columns can be <br />12 described by an exponential decay curve that can be scaled for <br />l3 length of column ae long as all the salts of concern are readily <br />14 soluble . <br />LS 3. Saturation extract is inadequate as a parameter upon which to base <br />L6 the estimated total dissolved solids to be extracted from <br />L7 disturbed material. <br />18 4. The batch extraction of salts from < 0.5 mm material with at least <br />L9 1:2 ratio of material to water appears adequate for the estimation <br />:0 of total dissolved solids in that size fraction. <br />Z1 5. An adequate estimate of the total dissolved solids from the <br />:2 Ailliams Fork shale based material can be obtained through a batch <br />:3 determination of total disseolved solids from material < 0.5 mm <br />34 using a 1:2 ratio of material to water and a wet sieve estimate of <br />:5 the percentage of particles < 0.5 mm. The assumption is made that <br />:6 all the salts come from this fraction. <br />;7 6. The estimate of total dissolved solids from Glenrock sandstone <br />11 <br />