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The tables presented on the following pages should be reviewed in <br /> light of acknowledged uncertainties in the data. For the most part, <br /> ,— the waste generation data are based on the DNS manifest data. Mani - <br /> fest errors arise because there exists more than one way to "correct- <br /> ly" code a complex mixture. Under the current classification system, <br /> more than one waste code may describe a mixture, and different genera- <br /> tors may use different codes to describe the same mixture. Another <br /> problem is that two classification systems are used, one at the state <br /> level , and the other at the federal level . Confusion on the part of <br /> the generator completing the manifest form is evidenced by the number <br /> of manifests that have information either omitted or incorrectly <br /> '-- entered. <br /> PJ9 9390502D.000 5-14 Rev. 1 11/08/88 <br />