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Equipment Decontamination Standard Operating Procedure SWE-FSOP-801;Revision 1 Ahtna Southwest Environmental Operations 2. Spray equipment with water mixed with Alconox or Liquinox. 3. Wipe down with a clean, dry paper towel. 4. Spray equipment with laboratory-certified PFAS-free water. S. Wipe down with a clean, dry paper towel. 6. Repeat Steps 4 and S twice more (for a total of three rinses with laboratory-certified PFAS- free water). Store clean, dry sampling equipment within a protective medium (e.g., plastic bag, etc.) or staged in a clean area for future use.Cleaning and decontamination wastes must be properly contained and disposed of in accordance with project IDW management procedures. Use disposable sampling equipment whenever possible (e.g., drum samplers, bailers, spoons, etc.) to minimize the need to decontaminate these items. 4.5 Large Equipment Decontamination Perform gross decontamination of large equipment before delivery to the site, before transporting equipment from one contaminated location to another, and before leaving the site. Gross decontamination focuses on minimizing the spread of contaminated media as a result of equipment movement or transport. This decontamination process uses dry methods (brooms, wipes, shovels, etc.) within the exclusion zone in order to remove large, easily dislodged deposits of soil and other contaminated media prior to exiting the exclusion zone. When equipment is no longer needed and will be removed permanently from the site, it shall be decontaminated using brushes and/or a pressure washer with a detergent wash followed by a water rinse. [PFAS Project]:To the extent practical, rinse parts of equipment that come into direct contact with samples with PFAS-free water. When equipment is no longer needed on site and will be removed permanently from the site, it shall be decontaminated using brushes and/or a pressure washer with Alconox, Liquinox, or Citranox wash followed by a triple rinsing with PFAS-free water rinse. Final decontamination shall occur within a decontamination pad to allow for the collection of decontamination materials, solids, and water. Additionally, large equipment should be free of leaks (i.e., hydraulic fluid,oil,gas, etc.)that could become a source of contamination. 4.6 Dry Decontamination In cases where dry decontamination or larger equipment is required, follow this procedure at the site: 1. Remove as much debris or contamination as possible using a dry brush, broom, shovel, or paper towel. 2. Check crevices,tire treads, hinges, and other surfaces that may trap contaminants; remove visible residue with a brush, scraper, etc. 3. Inspect all surfaces and,where necessary,wipe them down with a clean, dry paper towel as a final step. 4. Dispose of all paper towels with other IDW and disposable sampling supplies. Page 9 of 10