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will be decontaminated prior to commencing drilling at each <br /> hole . Well construction materials will be cleaned as <br /> necessary, prior to installation. <br /> Equipment and well material decontamination will be <br /> 1 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 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 <br /> analysis will be washed in a nonpho phate detergent (A conox <br /> 1 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 deicnized <br /> water. <br /> 7.0 Field Equipment Calibration and Maintenance <br /> ' The following measuring equipment may be used during <br /> Remedial Investigation. Equipment is grouped by ield <br /> ' activity. Calibration procedures and frequency are listed <br /> for each piece. <br /> Soil _Borings and Well Dimensions-Steel and coated cloth <br /> tape. Calibration: rione. <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 /> 1 surveyor' s tape. <br /> organic Vapors- Photolonization detector. Calibration: <br /> Daily field Calibration using a isobutylene standard as per <br /> ' manufacturers instructions. <br /> Groundwater pH Measurement- Digital pH meter. Calibration: <br /> 1 standard pH solutions of 4, 7, and 10 will be utilized for <br /> daily field calibration according to manufacturers <br /> instructions. <br /> Electrical Conductivity- Electrical conductivity meter. <br /> Calibration: factory-calibrated annually and periodically <br /> calibrated against laboratory prepared standard calibration <br /> t solution. <br /> Water Temnerature- Mercury or digital thermometers . <br /> Calibration: factory-calibrated once. <br />