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wtll be decontaminated prior to commencing drilling , t each <br /> hole . Well construction materials will be cleaned as <br /> necessary, prior to installation. <br /> 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 :.leaner <br /> The equipment will be placed on a drying rack for air <br /> drying. The decontamination water will stored in containers <br /> certified for hazardous materials storage ana disposed of in <br /> an approved manner. <br /> Sample equipment: to be used for pesticides and organic <br /> analysers will be washed in a nonphosphate detergent (Alconox <br /> or equivalent ) and rinsed with tap water, followed by <br /> deionized water and finally with acetone. If the equipment <br /> is 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 /> 0 <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 Boripgs and Well Dimensions-Steel and coated cloth <br /> tape. CaliLration: none. <br /> Water Level Medsurements in Wells- Steel surveyors tape <br /> Calibration: manufacture- 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- Fhotoionization detector. Calibration: <br /> Daily field 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, armed lO will be utilized for <br /> daily field calibration accordinq to manufacturers <br /> instructions. <br /> Electrical. Conductivity-- Electrical conductivity meter. <br /> Ca3ibration:'- factory-calibrated annually and periodically <br /> calibrated against laboratory prepared stanCard calibration <br /> solution. <br /> Water Tempexature- Mercury or digital thermometers <br /> Calibration: factory--calibrated once <br />