2023-07-28_REVISION - M1977170 - Laserfiche WebLink

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PMy n During the premobilization phase,the disposal method required for the decontamination rinse and wastewater must be established based on the anticipated constituents in the water and the regulatory status of the water. Certain types of decontamination water may be considered a Resource Conservation and Recovery Act (RCRA) hazardous waste and will require special handling. You must check with the work plan, project manager, or client to understand the disposal options. Note: If decontamination is not possible, or field conditions are not suitable for decontamination, the project manager must be notified so that alternate procedures can be implemented. 5.0 General Decontamination Procedures Project-specific variations from this SOP must be documented in the field log for the project. The following general procedures are appropriate for decontamination of glass or metal equipment at most project sites: • Dry-brush as necessary to remove large particles. • Gross wash with water and a scrub brush. • Wash with tap water and phosphate-free detergent. • Rinse with tap water. • Rinse with deionized/distilled water. • Repeat steps as need if additional decontamination is required • Allow equipment to air dry or use wipes/paper towels as appropriate to dry external surfaces. If it is necessary to use a solvent cleaner for decontamination, procedures for use should be included in project- specific documents. 6.0 Water Level and Interface Probe Decontamination Procedures Porous ground surface areas next to wells may be impacted from historical sampling activities, and those areas should be considered potentially impacted. The entire length of tape exposed to the ground surface and/or inside of the well casing needs to be decontaminated prior to sampling and between monitoring locations. The length of the tape should be decontaminated using the following: • Wash with distilled water and phosphate-free detergent. • Rinse with deionized/distilled water. 7.0 Pump Decontamination Procedures Downhole pumps used for sampling should be decontaminated before first use, between monitoring locations, and prior to leaving the site. Internal pump surfaces are often not accessible for direct decontamination. In these situations, it may be necessary to disassemble the pump and/or submerge the pump in decontamination fluids (appropriate for the project) to minimize the potential for cross contamination.As internal surfaces may Decontamination Procedures for Field Equipment December 23, 2022 Page 3 of 4