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Equipment Decontamination Standard Operating Procedure <br /> SWE-FSOP-801;Revision 1 Ahtna Southwest Environmental Operations <br /> [PFAS Project]: Wash water-resistant equipment thoroughly and vigorously with PFAS-free <br /> potable water containing laboratory-grade detergent(Alconox, Liquinox, or Citranox) and a <br /> polyethylene or polyvinyl chloride (PVC) brush. Rinse equipment thoroughly three times with <br /> certified PFAS-free deionized water or another source acceptable for project use. <br /> 2. Unless the equipment will be used immediately, wrap in new aluminum foil, plastic, or other <br /> appropriate material to keep it clean until needed. For large bulky equipment, clean plastic sheeting <br /> can be substituted for aluminum foil. If the protective wrapping on a piece of pre-cleaned <br /> equipment has been torn or if there is a question of its cleanliness,the equipment should be <br /> considered contaminated and undergo full decontamination procedures before use. <br /> [PFAS Project]: Do not use aluminum foil, as PFAS are sometimes used as a protective layer. <br /> 4.4.2 Post-Sampling <br /> This section applies broadly to all hand tools (trowels, bowls, hand augers, slide hammer samplers, and <br /> other specialized and non-specialized tools), as well as meters and gauges (multimeters, water-level <br /> indicators, etc.).All non-disposable sampling equipment should be cleaned prior to the next use. <br /> Follow these cleaning procedures: <br /> 1. Remove as much gross contamination (such as pieces of soil) as possible from equipment at the <br /> sampling site. <br /> 2. Wash water-resistant equipment thoroughly and vigorously with potable water containing <br /> detergent such as Liquinox or equivalent, and use a bristle brush or similar utensil to remove any <br /> remaining residual contamination. <br /> 3. Rinse equipment thoroughly with potable water(1st rinse). <br /> 4. Rinse equipment thoroughly with distilled or deionized water(2nd rinse). <br /> 5. For sensitive field instruments, rinse equipment with distilled, deionized, or reagent grade water <br /> (3rd rinse). <br /> Note:Rinse waters are not reused and should be discarded in an appropriate IDW container. <br /> 6. Air dry at a location where dust or other fugitive contaminants will not contact the sampling <br /> equipment.Alternatively, wet equipment may be dried with a clean, disposable paper towel to <br /> assist the drying process. All equipment should be dry before reuse. <br /> Note: For non-dedicated bladder pumps used during sampling, reusable pump components should be <br /> decontaminated using steam cleaning and/or Steps 3 through 6 above. Insert a new bladder into the <br /> pump housing and use new tubing cut to the required length between each monitoring well sampled. <br /> Do not reuse wetted components. Follow the bladder pump manufacturers'guidelines and <br /> specifications for changing wetted components in between sample points. <br /> Note: For rigs and variable speed pumps used during well development, all wetted components shall <br /> be steam cleaned and rinsed using clean potable water. <br /> [PFAS Project]: In cases where dry decontamination is required,the following steps shall be <br /> followed at the sampling site: <br /> 1. Remove as much debris or contamination as possible using a dry polyethylene or PVC brush <br /> or paper towel. <br /> Page 8 of 10 <br />