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Clayton Group Services Page 2 <br />Standard Operating Procedures <br />SOP -3 - Decontamination of Field Equipment <br />• Chemical -free paper towels. <br />• Disposable gloves appropriate to the contamination (rubber, latex, Nitrile, etc.). <br />• Waste storage containers. <br />• Plastic ground cloth for drying equipment. <br />• Cleaning containers (plastic and/or galvanized steel drums or buckets). <br />• Cleaning brushes with non -contaminating bristles. <br />• Steam -cleaning equipment, if appropriate. <br />4. Gross removal of material: <br />• Steam cleaning - If steam -cleaning equipment is available (from the driller), it is a <br />very effective means of gross cleaning, especially of soils from the equipment. <br />Detergent wash - A phosphate -free detergent wash using a brush made with inert <br />material followed by rinsing with tap water is effective in removing soil and <br />groundwater residue from equipment. For equipment that can not be cleaned with <br />a brush, such as tubing, the detergent solution followed by tap water wash should <br />be circulated through the equipment. If the specific contaminant removal <br />procedure as described below is not necessary, a distilled/deionized water wash <br />should follow the tap water wash, followed by air drying in an area where <br />airborne contaminants will not settle onto the equipment. Care must be taken to <br />wash all residue and rinse water into the cleaning tub for disposal. <br />5. Specific Contaminant Removal <br />• Organic desorbing wash - For removal of many organic contaminants, methanol is <br />an effective desorbing agent, and it can easily be removed by rinsing with water <br />following the methanol rinse. Methanol or other solvent can be applied by a <br />peristaltic pump or squirt bottle taking care to contain all rinsate in a drum or <br />bucket. If other desorbing agents are used, it may be necessary to allow the <br />desorbing agent to dry prior to the final water rinse since not all desorbing agents <br />are soluble in water and may leave their own residue. In either case, the organic <br />desorbing agent rinse is followed by rinsing with tap water followed by rinsing <br />with distilled/deionized water and air drying as above. <br />Inorganic (metal contaminant) desorbing wash - Effective removal of metals <br />contamination from equipment typically requires washing with acid solvents. The <br />acid of choice, in general, is 10% nitric acid using a peristaltic pump or squirt <br />bottle followed by rinsing with tap water and distilled/deionized water. All <br />rinsate should be contained for proper disposal. <br />Combined organic/metals contamination - When equipment has been exposed to <br />both organic and metals contamination the acid rinse is performed first followed <br />S:AEnnrAProjASOPS\SOP-3.doc <br />