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SOP for Decontamination of Field Sampling Equipment — Hansen Project 2 <br />Rinse and detergent waters will be replaced with new solutions between borings or sample locations. <br />Spent wash and rinse waters will be disposed onsite or contained for disposal in the sewer system at <br />the field office, or in an acceptable sanitary sewer system. <br />Following decontamination, equipment will be placed in a clean area or in clean Ziplock® bags, trash bags, or <br />plastic sheeting to prevent contact with contaminants. If the equipment is not used immediately, it will be <br />covered or wrapped in plastic sheeting or heavy duty trash bags to minimize potential airborne contamination. <br />3.2 Off -site Decontamination Procedures <br />Field sampling equipment such as swing - sampler bottles, sampling buckets, and field instruments are <br />commonly decontaminated offsite, at the end of each day, in a hotel room or other facility. Used equipment <br />that requires decontamination shall be kept separate from clean, decontaminated equipment, using a system <br />that clearly differentiates between `used' and `clean' equipment. The following steps will be used to <br />decontaminate field sampling equipment off site: <br />1. Latex gloves will be worn during equipment decontamination and changed regularly as needed. <br />2. Sample bottles and other equipment that will not be damaged by water will be placed in a sink or wash <br />tub containing Alconox®, Liquinox® or low - sudsing detergent and potable water, and scrubbed with a <br />bristle brush or similar utensil. <br />3. Equipment will next be rinsed in the sink with tap water. <br />4. Equipment will be rinsed again using deionized or distilled water from a hand -held squirt bottle. <br />5. Equipment will be allowed to air -dry on clean paper towels, or will be dried manually with clean paper <br />towels or Kimwipes® laboratory wipes. <br />6. Equipment that may be damaged by water will be carefully wiped clean using a sponge and detergent <br />water and rinsed with distilled or deionized water. Care will be taken to prevent any equipment <br />damage. <br />7. Spent wash and rinse waters will flow down the drain into an acceptable sanitary sewer system. <br />Following decontamination, sample collection bottles will be placed in clean Ziplock® bags and stored. If the <br />equipment is not used immediately, it will be covered or wrapped in plastic sheeting or heavy duty trash bags <br />to minimize potential airborne contamination. <br />3.3 Monitoring Well Materials <br />If possible, monitoring well materials will be factory pre- cleaned. Any materials (casing, screens, etc.) that <br />are not factory- cleaned and sealed will be decontaminated as described above. If the materials are not to be <br />used immediately, they will be stored in a designated clean area or wrapped in clean plastic bags for <br />transport to the well location. <br />4. QUALITY ASSURANCE (QA) REQUIREMENTS <br />Equipment rinsate samples may be collected from decontaminated sampling equipment to verify the <br />effectiveness of the decontamination procedures. The rinsate procedure will include rinsing deionized or <br />distilled water through or over sampling tool (e.g. bailer, pump, or bottle) and collecting the rinsate water into <br />the sample bottles, which will be sent to the laboratory for analysis. The rinsate procedure, including the <br />sample number, will be recorded in the fieldbook. Decontamination rinsates of the decontaminated sampling <br />equipment will be collected at a frequency specified in the project QAPP. <br />5. DOCUMENTATION <br />Sampling personnel will be responsible for documenting the onsite decontamination of sampling and drilling <br />equipment. The documentation will be recorded with waterproof ink in the sampler's fieldbook with <br />4153A.140129 Whetstone Associates <br />