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A comprehensive biological , sediment , and water quality study of the lower Little Scioto River near Marion , Ohio , USA , was undertaken to evaluate the changes or improvements in biotic measurements following the removal of creosote - contaminated sediment .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
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