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ATC Associaws Inc. <br /> • Qualiry Assurance/pualiry Control flan <br /> Revised November 2002 <br /> 6.0 SA TLING IND DRILLING EQUIPMENT DECONTAMINATION <br /> :all equipment used for drilling and sampling will be decontaminated prior to use. All equipment <br /> used for collection of more than one sample, such as bailers and spoons, will be decontaminated <br /> between each use to prevent cross contamination between samples. Drilling equipment will be <br /> decontaminated prior to commencing drilling at each hole. Well construction materials will be <br /> cleaned as necessary, prior to installation. <br /> Equipment and well material decontamination will be conducted on an impermeable surface and <br /> all decontamination effluent will be contained. All surfaces of the equipment will be thoroughly <br /> decontaminated using a steam cleaner. The equipment will be placed on a drying rack for air <br /> drying. The decontamination water will be stored in containers certified for hazardous materials <br /> storage and disposed of in an approved manner. <br /> • <br /> Sample equipment to be used for pesticides and organic analysis will be washed in a <br /> nonphosphate detergent (Alconox or equivalent) and rinsed with tap water, followed by <br /> deionized water. If the equipment is for metals analysis, the initial rinse will be conducted with <br /> 0.1 N nitric acid followed by tap water and deionized water. <br /> 7.0 FIELD EQUIPMENT CALIBRATION AND MAINTENANCE <br /> The following measuring equipment may be used during the Remedial Investigation. Equipment <br /> is grouped by field activity. Calibration procedures and frequency are Listed by piece. <br /> Soil Borings and Well Dimensions <br /> Steel and coated cloth tape. Calibration: none. <br /> • w:ladrninlshe11slgagc-02.doc <br /> 5 <br />