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ATC Associates Inc. <br /> Quality Assurance/Quality Control Plan <br /> Revised March 1998 <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 all <br /> 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 /> i <br /> Sample equipment to be used for pesticides and organic analysis will be washed in a nonphosphate 1 <br /> detergent (Alconox or equivalent) and rinsed with tap water, followed by deionized water. If the <br /> equipment is for metals analysis, the initial rinse will be conducted with 0.1 N nitric acid followed <br /> by tap water and deionized water. <br /> j <br /> 7.0 FIELD EQUIPMENT CALIBRATION AND MAINTENANCE <br /> The following measuring equipment may be used during the Remedial Investigation. Equipment is <br /> grouped by field activity. Calibration procedures and frequency are listed by piece. <br /> soil Ba ' and Well Dimensions <br /> Steel and coated cloth tape. Calibration: none. <br /> Water Levey Measurements in Wells p <br /> Steel surveyors tape. Calibration: manufacturer supplied temperature correction will be <br /> applied as applicable for field conditions. Electrical well sounders. Calibration: check w <br /> against steel surveyor's tape. <br /> W:1Admin\Shells\QAQC-98.DOC <br /> 5 <br /> Y <br />