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PMY <br /> not be visible, decontamination must include repeatedly submerging the equipment in deionized/distilled water <br /> to remove residual detergents and/or contamination prior to reuse. <br /> 8.0 Drilling and Other Large Equipment Decontamination Procedures <br /> Large equipment may require decontamination for potential chemical impacts or for removal of noxious weed <br /> seeds or similar transferrable media. A steam cleaner utilizing domestic cold water is typically used for <br /> decontamination of large equipment. High-pressure steam cleaners remove potentially impacted materials at <br /> high pressures and high temperatures. Unless other means of disposal are acceptable, steam cleaning <br /> decontamination water should be captured on plastic sheeting or other containment, and then containerized <br /> and disposed in accordance with federal, state, and local regulations. Use of detergent is not typically required <br /> when high pressure steam cleaning applications are utilized. If large equipment requires decontamination with <br /> detergent, procedures for these activities should be included in project-specific documents. <br /> 9.0 Documentation <br /> Methods of decontamination must be thoroughly recorded in the field logs including methods used, chemicals <br /> or detergents used (if applicable), time of decontamination activities, and observable condition of equipment <br /> after decontamination is complete. Field logs should also include documentation of the disposal method used <br /> for the decontamination rinse and wastewater. <br /> Decontamination Procedures for Field Equipment <br /> December 23, 2022 <br /> Page 4 of 4 <br />