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• Teature of Overburden Spoil <br />A large sample of the spoil from the ezisting mined area vas <br />obtained to evaluate the gradation of future spoils. The teat <br />sample weighed about 400 pounds. Because of testing difficulty, <br />sizes larger than 12 inches were eacluded from the teat sample. <br />Based upon previous ezperience in the proposed permit area, about 35 <br />percent of the spoil materials should be 12 inches or larger after <br />compaction. Gradation of the remaining 65Z of the sample was as <br />follows: <br />Sieve Size S By Weight Passing <br />8-inch 87.1 <br />6-inch 68.7 <br />3-inch 55.1 <br />1.5-inch 43.1 <br />3/4-inch 33.1 <br />3/8-inch 24.9 <br />No. 4 16.3 <br />No. 8 10.2 <br />No. 16 6.6 <br />No. 30 4.8 <br />No. 50 3.7 <br />No. 100 3.0 <br />No. 200 2.3 <br />As indicated in the table above, the sample contains only 2.3 <br />percent passing the No. 200 sieve and about 10 percent passing the <br />No. 8 sieve. Compaction should further break down the spoil. <br />Chemical Analysis of Overburden <br />. Chemical analyses of each stratum within the overburden and the <br />2.04-32 <br />