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<br />11 <br />Estimation of Salt Load from Spoil Haterial Based on Drill Samplesl~ <br />2 <br />3I H. B. Gardner- <br />4 <br />5 <br />6 <br />Abstract <br />7 Separation of spoil material into size fractions and establishing <br />g curves of electrical conductivity versus eater leached for each <br />g fraction are show to provide reasonable data for use in constructing <br />10 curves of salt leached versus eater used for s spoil with any <br />L1 Particular size distribution. It is show that almost all of the salts <br />L2 that are readily leachable are obtained from the particle size fraction <br />L3 less than 0.5 mm in diameter in spoil derived from fine shale material. <br />Lq Oa this basis the estimation of salt leaching from these materials can ' <br />LS be based on the contribution of this fraction neglecting the larger <br />L6 size fractions. Other spoils derived from sandy materials may require <br />L7 inclusion of all fractions to obtain the same data. <br />LS A simplified vacuum extraction technique to obtain leaching curves <br />Lg and total extractable salts is presented upon which a routine procedure <br />;0 could be based. A 1:2 ratio eztract is show to be generally adequate <br />31 for determination of total salts with the recognition of the problems <br />:2 inherent is the salt dilution. This dilution ratio is suggested in <br />:3 place of saturation eztract which is inadequate for determining total <br />!4 salts. <br />:5 <br />:6 <br /> <br /> <br />• <br />