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TO E RO E K SOP No.002,REv.2 ASSOCIATES,INC. GENERAL EQUIPMENT DECONTAMINATION ..9 PAGE 5 2.3 BOREHOLE SOIL SAMPLING DOWNHOLE EQUIPMENT DECONTAMINATION All soil sampling downhole equipment should be decontaminated before use and after each sample as follows: 1. Select an area removed from sampling locations that is both downwind and downgradient. Decontamination must not cause cross-contamination between sampling points. 2. Maintain the same level of personal protection as was used for sampling. 3. Prior to sampling, scrub the split-barrel sampler and sampling tools in a wash bucket or tub using a stiff, long bristle brush and Liquinox or Alconox solution. If the sampler is grossly contaminated, consider using an initial steam cleaning; also consider whether the wash water should be changed after cleaning the equipment to minimize the risk of cross-contamination from subsequent decontamination of other samplers. 4. After washing, rinse the sampling equipment over the rinsate tub using potable water followed by triple rinsing with deionized water and allow to air dry. 5. Place cleaned equipment in a clean area on plastic sheeting and wrap with aluminum foil or place in a clean container. 6. Containerize all water and rinsate; expended disposable single-use sampling equipment should also be containerized. 7. Decontaminate all equipment placed down the hole as described for drilling equipment. 2.4 WATER LEVEL MEASUREMENT EQUIPMENT DECONTAMINATION Field personnel should decontaminate the well sounder and interface probe before inserting and after removing them from each well. The following decontamination procedures should be used: 1. Select an area removed from sampling locations that is both downwind and downgradient. Decontamination must not cause cross-contamination between sampling points. Do not decontaminate the probe directly over the monitoring well to avoid rinsate from dripping into the well. 2. Maintain the same level of personal protection as was used for sampling. 3. Wipe the tape and probe with a disposable Alconox or Liquinox-impregnated cloth or paper towel.