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Quality Assurance/Quality Control Plan Page 4 <br />5.3 DELIVERY OF SAMPLES TO LABORATORY <br />Samples will be delivered to the laboratory on a daily basis. Samples will be refrigerated to <br />approximately 4°C for shipping. Shipping containers will be sealed with security tape to assure <br />sample integrity during shipping. Delivered samples will be accompanied by a chain -of -custody <br />record. The laboratory shall note on the chain -of -custody that samples were properly preserved <br />and security tape was intact upon arrival. <br />6.0 SAMPLING AND DRILLING EQUIPMENT DECONTAMINATION <br />All equipment used for drilling and sampling will be decontaminated prior to use. All equipment <br />used for collection of more than one sample, such as bailers and spoons, will be decontaminated <br />between each use to prevent cross contamination between samples. Drilling equipment will be <br />decontaminated prior to commencing drilling at each hole. Well construction materials will be <br />cleaned as necessary, prior to installation. <br />Equipment and well material decontamination will be conducted on an impermeable surface and <br />all decontamination effluent will be contained. All surfaces of the equipment will be thoroughly <br />decontaminated using a steam cleaner. The equipment will be placed on a drying rack for air <br />drying. The decontamination water will be stored in containers certified for hazardous materials <br />storage and disposed of in an approved manner. <br />Sample equipment to be used for pesticides and organic analysis will be washed in a <br />nonphosphate detergent (Alconox or equivalent) and rinsed with tap water, followed- by <br />deionized water and finally with acetone. If the equipment is for metals analysis, the initial rinse <br />will be conducted with 0.1 M nitric acid followed by tap water and deionized water. <br />7.0 FIELD EQUIPMENT CALIBRATION AND MAINTENANCE <br />The following measuring equipment may be used during the Remedial Investigation. Equipment <br />is grouped by field activity. Calibration procedures and frequency are listed for each piece. <br />