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1 <br /> Sample Collection - Groundwater <br /> 1 <br /> Sample collection procedures include equipment cleaning, water-level and total <br /> ' well-depth measurements, and well purging and sampling <br /> Equipment Cleaning <br /> ' Sample bottles, caps, and septa used in sampling for volatile and semi-volatile <br /> organics will be triple rinsed with high-purity deionized water After being rinsed, <br /> ' sample bottles will be dried overnight at a temperature of 20011C Sample caps <br /> and septa will be dried overnight at a temperature of 60❑C Sample bottles, caps, <br /> and septa will be protected from solvent contact between drying and actual use at <br /> ' the sampling site Sampling containers will be used only once and discarded after <br /> analysis is complete <br /> ' Plastic bottles and caps used in sampling for metals will be soaked overnight in a 1 <br /> percent nitric acid solution Next, the bottles and caps will be triple rinsed with <br /> deionized water Finally, the bottles and caps will be air dried before being used at <br /> ' the site Plastic bottles and caps will be constructed of linear polyethylene or <br /> polypropylene Sampling containers will be used only once and discarded after <br /> analysis is complete <br /> MBefore the sampling event is started, equipment that will be placed in the well or <br /> will come in contact with groundwater will be disassembled and cleaned thoroughly <br /> ' with detergent water, and then steam cleaned with deionized water Any parts that <br /> may absorb contaminants, such as plastic pump valves, bladders, bailer, etc , will <br /> be cleaned as described above or replaced The inside surfaces of the positive <br /> displacement (bladder) pump tubing will be cleaned by heating the tubing <br /> overnight at 120°C with a low-flow inert air source <br /> Decontaminated disposable polyethylene bailers (i e "Voss Single Sample <br /> ' Disposable Bailers") may be used in lieu of decontamination procedure During <br /> field sampling, equipment surfaces that are placed in the well or contact <br /> groundwater will be thoroughly cleaned and triple rinsed with deionized water <br /> ' before the next well is purged or sampled <br /> C-2 <br />