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will be decontaminated prior to con;me1"Ang drilli'ig at each <br /> hole. W.. lconstruction <br /> oons ucinstallation.onmaterials will be cleaned as <br /> nets ry. prior <br /> Equipment and wel� al dec ,idtiori <br /> eisurface oand mall decontamination <br /> conducted on an imprmeabl <br /> effluent will be contained. All surfaces of 'the equipment <br /> will be thoroughly decontaminated using <br /> g in Brack cleaner. <br /> rjnair <br /> The equipment will be placed on a Y g <br /> drying. The decontamination water will stored 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 nonphasp p water, followed(AlconoY <br /> or equivalent) and rinsed with tap <br /> deionized water and finallywith <br /> cexinse will tone. if tbe conducted <br /> e a <br /> is for metals analysis, water, and deionized <br /> with 0.1 N nitric acid followed by tap <br /> water. <br /> 7.0 Field Equipment Calibration and Maintenance <br /> The following measuring equipment may be used during the <br /> Rel;.edial Investigation. Equipment is grouped by field <br /> activity. Calibration procedures and frequency are listed <br /> for each piece. <br /> Sail Borin s and Well Dimensions-steel and coated cloth <br /> tape, Calibration: none. <br /> in Wells- Steel surveyors tape. <br /> Water Level ,!�easurements <br /> Calibration: manufacturer supe <br /> lied Cemperature correction <br /> for field conditions. <br /> will be c,pp].ied as applicable <br /> against steel <br /> Electrical well sounders. Calibrations check <br /> surveyor's tape. <br /> Organic moors- Photoionization detector. Calibration: <br /> Ifie3.d Calibration using a isobutylene standard as Per <br /> Daily <br /> manufacturers instructions. <br /> Groundwater � Measurement- Digital pH meter. Calibration: <br /> stan-�-daid PF sotilized for <br /> lutions of 4, 7, and 10 will be anufacturers <br /> daily field calibration according <br /> instructions. <br /> Electrical conductivity Meter. <br /> Electrical Cnuct - periodically <br /> Calira ,onrfactory_ca_ibratenaly periodically <br /> calibrated against laboratory PLeP rd <br /> solution. <br /> Water Tem erature- Mercury or digital thermometers. <br /> Calibrations factory calibrated once- <br />