5177
This ecological risk assessment describes the steps and rationale taken to evaluate the risk posed by an area of PCB - contaminated marine sediments in an otherwise relatively pristine northern coastal environment .
 Chemical: PCB
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: PCB