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The ESBs are intended as a complement to existing sediment - assessment tools , to assist in determining the extent of sediment contamination , to help identify chemicals causing toxicity , and to serve as targets for pollutant loading control measures .
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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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