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r� <br /> a C Sampling and Drilling Equipment DecontaminatLon <br /> All equipment uued for drilling, 4ell materials and sampling <br /> soil and groundwater gill be decontaminated prior to use <br /> All equipment used for collection of more than one sample, <br /> such as bailers and spoons, rill be decontaminated between <br /> each use to prevent cross contamination between samples <br /> Drilling equipment will be decontaminated prior to <br /> commencing drilling at each hole <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 rinsed with potable water. The equipment <br /> will be placed on a drying rack for air drying. The <br /> decontamination water will stored in containers certified <br /> for hazardous materials storage and disposed of in an <br /> approved Tanner. <br /> r� <br /> Sample equipment to be used for pesticides and organic <br /> analysis will be flashed in a nonphosphate detergent (Alconox <br /> or equivalent ) and rinsed Frith tap water, followed by <br /> deionized water and finally with acetone. If the equipment <br /> is £or metals analysis, the initial rinse .gill be ccnducted <br /> with 0.1 v nitric acid followed by tap grater and delonized <br /> i water. <br /> w� <br /> 7 J Field Equipment Calibration and Maintenance <br /> The following reasuring equipment may be used during the <br /> Remedial Investigation. Equipment is grouped by field <br /> s activity. Calibration procedures and freq:tency are listed <br /> for each piece. <br /> Fry <br /> Soil Sorbs and Well Installation- Steel and coated cloth <br /> tape. Calibration: none. <br /> Water Level Measurements in wells- Steel surveyors tape. <br /> Calibration: manufacturer supplied temperature correcticn <br /> � <br /> will be applied as applicable for field conditions . <br /> Electrical well sounders. Calibration: check against steel <br /> surveyor's tape. <br /> Organic Vapors- Photo ionization detector. Calibration. <br /> Daily field Calibration using a benzene standard. <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. <br />