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Listed Wastes <br /> • P and U codes - Discarded commercial <br /> chemical products includes: P codes <br /> (acutely hazardous) and U codes (non- <br /> acutely hazardous) . <br /> • They are not considered hazardous until they <br /> are discarded in its unused form. They can be <br /> stored indefinitely if they are to be used. <br /> • Many P-code wastes are pesticides <br /> 19 <br />