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TO E RO E K SOP No.002,REv.2 <br /> ASSOCIATES,INC. GENERAL EQUIPMENT DECONTAMINATION <br /> ..9 PAGE 6 <br /> 4. If immiscible layers are encountered,the interface probe may also require washing <br /> with pesticide-grade isopropanol. <br /> 5. Rinse or wipe the tape and probe with deionized water. <br /> 2.5 GENERAL SAMPLING EQUIPMENT DECONTAMINATION <br /> All non-disposable sampling equipment should be decontaminated using the following <br /> procedures: <br /> 1. Select an area removed from sampling locations that is both downwind and <br /> downgradient. Decontamination must not cause cross-contamination between <br /> sampling points. <br /> 2. Maintain the same level of personal protection as was used for sampling. <br /> 3. To decontaminate a piece of equipment, use an Alconox wash; a tap water wash; a <br /> solvent (isopropanol, methanol, or hexane) rinse, if applicable, or dilute (0.1 N) <br /> nitric acid rinse, if applicable; triple rinsing with potable water followed by triple <br /> rinsing with a distilled water rinse; and air drying. Use a solvent (isopropanol, <br /> methanol, or hexane) rinse for grossly contaminated equipment (for example, <br /> equipment that is not readily cleaned by the Alconox wash). The dilute nitric acid <br /> rinse may be used if metals are the analyte of concern. <br /> 4. Place cleaned equipment in a clean area on plastic sheeting and wrap with <br /> aluminum foil or place in a clean container. <br /> 5. Containerize all water and rinsate. <br /> 2.6 GROUNDWATER SAMPLING EQUIPMENT DECONTAMINATION <br /> The following procedures are to be employed for the decontamination of equipment used <br /> for groundwater sampling. Decontamination is not necessary when using disposable <br /> (single-use) pump tubing or bailers. Bailer and downhole pumps and tubing <br /> decontamination procedures are described in the following sections. <br /> 2.6.1 Bailers <br /> 1. Select an area removed from sampling locations that is both downwind and <br /> downgradient. Decontamination must not cause cross-contamination between <br /> sampling points. <br /> 2. Maintain the same level of personal protection as was used for sampling. <br /> 3. Evacuate any purge water in the bailer. <br /> 4. Scrub using soap and water and/or steam clean the outside of the bailer. <br />