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P- and U-Usted Hazardous Wastes <br /> ■ Discarded commercial chemical products fall into <br /> two groups: <br /> — Acutely hazardous or toxic waste (P-codes) <br /> — Hazardous or toxic waste (U-codes) <br /> ■ For example , if you have a chemical that has <br /> exceeded its shelf life and can't be used , this <br /> chemical may be a P or U waste ( P wastes are <br /> more toxic than U wastes) <br /> s No typical ADESA wastes <br />