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1 salts. For this material it appears that the determination of salts <br />2 leached from the < 0.5 mm material can be applied to any or all sizes. <br />3 How this would apply to other materials would depend on their <br />4 individual characteristics. <br />g It would be useful to scale the electrical conductivity vs water <br />g leached for depth of spoil. It is recognized that the length of <br />q columns used in the experiments was quite short when compared with the <br />g thickness of disturbed material in the field which may be as much as 50 <br />g meters. The data describing the leaching from different laigth columns <br />10 are converted to volume per unit weight of material to remove the <br />11 density and column length factors. Data for leaching of salts from <br />12 columns of 0.25, 0.50 and 1 m length using Glenrock material are <br />13 Presented is Fig. 4. The general shape of the leaching curve can be <br />14 approximated by an ezponential decay curve as long as significant • <br />amounts of gypsum are not present. The curve presented with the data <br />points in Fig. 4 vas fit to the two pairs of points for the 0.25 m <br />17I column at approximately 0.025 and 0.125 1/kg. The equation is: <br />1 <br />EC ~ 2.79 sap -34.3 'Q <br />(1) <br />19 <br />where EC ie the electrical conductivity and Q. is the eater leached per <br />unit weight of material. A hypothetical maximum concentration of salts <br />22~ leaching from the spoil material can be determined by solving Equation <br />1 for zero eater leached. This quantity is questionable because the <br />24~ use of the equation requires the assumption Chat all the salts have <br />approximately the same solubility. The relatively successful scaling <br />of data for these columns indicates that on a small scale with uniform <br />material the leaching of salts is fairly complete. However, in the I • <br />8 <br />