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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 /> 4 <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 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 and organic <br /> analysis 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. 10 the equipment <br /> Is for metals analysis, the initial rinse will be conducted <br /> d 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 lasted <br /> for each piece. <br /> • Soil Borings and Well Dimensions-Steel and coated czoth <br /> tape. Calibration: none. <br /> Water Level Measurements in Wells- Steel 1,urveycrs tape. <br /> Calibration: manufacturer supplied temperature col- ect,,)n <br /> will be applied as applicable for field conditions . <br /> Electrical well sounders. Calibration: check against steel <br /> surveyor' s tape. <br /> arc Va ors- Photoionization detector. Calibration: <br /> Daily field Calibrat:ion using a isobutylene standard as per <br /> manufacturers instructions. <br /> Groundwater pH Measurement- Digital �H meter. Calibration: <br /> standard pH solutions of 4, 7, and 16 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 calibia• ion <br /> solution, <br /> Water Tem erature- Mercury or digital ther-nometers . <br /> Calibration: factory-calibrated once. <br />