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f <br /> j <br />�a J <br /> OA <br /> will be decontaminated prior to commencing drilling at each <br /> hole. Well construction materials will be cleaned as <br /> .. necessary, prior to installation, <br /> y^ Equipment and well material decontamination will be <br /> conducted on an impermeable surface and all decontamination <br /> effluent will be contained. All surfaces of the equipment <br /> will be thoroughly decontaminated using a steam cleaner. <br /> The equipment will be placed on a drying rack for air <br /> drying. The decontamination water will stared in containers <br /> certified for hazardous materials storage and disposed of in <br /> an approved manner, <br /> Sample equipment to be used for pesticides and organic <br /> - analysis will be washed in a nonphosphate detergent (Alconoz <br /> or equivalent) and rinsed with tap water, followed by <br /> deion3zed water and finally with acetone. If the equipment <br /> its For metals analysis, the initial rinse will be conducted <br /> with 0.1 N nitric acid followed by tap water and deionized <br /> water. <br /> 7.0 Field Equipment Calibration and Maintenance <br /> The following measuring equipment may be used during the <br /> _ Remedial Investigation. Equipment Is grouped by field <br /> activity. Calibration procedures and frequency are listed <br /> for each piece. <br /> Soil Borincs and Well Dimensions-Steel and coated cloth <br /> tape. Calibration: none. <br /> water Level Measurements in Wells- Steel surveyors tape. <br /> Calibration: manufacturer supplied temperature correction <br /> will be applied as applicable for field conditions. <br /> Electrical well sounders. Calibration: check against steel <br /> surveyor's tape. <br /> Organic Vapors- Photoionization detector. Calibration: <br /> Daily zield Calibration using a isobutylene standard as per <br /> manufacturers instructions. <br /> Groundwater pH Measurement- Digital pH meter. Calibration: <br /> standard pH solutions of 4, 7, and 10 will be utilized for <br /> daily field calibration according to manufacturers <br /> instructions. <br /> Electrical ConductiviElectrical conductivity meter. <br /> Calibration: factory-calibrated annually and periodically <br /> calibrated against laboratory prepared standard calibration <br /> solution. <br /> erature- Mercury or digital thermometers. <br /> Calibration: factory-calibrated once. <br />