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TO E RO E K SOP No.002,REv.2 ASSOCIATES,INC. GENERAL EQUIPMENT DECONTAMINATION ..9 PAGE 4 of concrete,wood, or plastic sheeting, depending on the site-specific needs and plans. Decontamination pads should not be proximate to sampling locations to avoid potential cross-contamination, should be constructed to contain all wastewater, and should be sloped with a sump to collect all wastewater.Wash waters and contaminated soil generated during decontamination activities should be considered contaminated and thus, should be collected and containerized for proper disposal. Monitoring well casing, screens, and fittings are assumed to be delivered to the site in a clean condition. However, they should be steam cleaned and placed on polyethylene sheeting on-site prior to placement downhole unless they arrive on site in protective material (e.g., inside a plastic wrapping). The drilling subcontractor will typically furnish the steam cleaner and water. The drilling auger, bits, drill pipe, any portion of drill rig that is over the borehole, temporary casing, surface casing, and other equipment used in or near the borehole should be decontaminated by the drilling subcontractor 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 as a minimum. If a pressure washer is used, addition PPE, such as a face-shield,will be required. 3. Remove loose soil using shovels,scrapers,wire brush, etc. 4. Steam clean or pressure wash to remove all visible dirt. 5. If equipment has directly or indirectly contacted contaminated media and is known or suspected of being contaminated with oil, grease, polynuclear aromatic hydrocarbons (PAH),polychlorinated biphenyls (PCB), or other hard to remove organic materials,rinse equipment with pesticide-grade isopropanol. 6. To the extent possible,allow components to air dry. 7. Wrap or cover equipment in clear plastic until it is time to be used. 8. All wastewater from decontamination procedures should be containerized daily such that no water remains in the sump (e.g., to minimize the risk of wildlife drinking potentially contaminated water).