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Sample Collection - Groundwater <br /> ' <br /> Sample collection procedures include equipment cleanin , water-level and total <br /> well-depth measurements, and well purging and sampling <br /> ' <br /> Equipment Cleanin <br /> 9 <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 200°C Sample caps and <br /> ' septa will be dried overnight at a temperature of 60°C Sample bottles, caps, and <br /> septa will be protected from solvent contact between drying and actual use at the <br /> ' 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 /> Before the sampling event is started, equipment that will be placed in the well or will <br /> 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 overnight <br /> at 120°C with a low-flow inert air source <br /> ' Once the bladder pump is cleaned and reassembled, a pump blank will be obtained <br /> by pumping organic-free water through the bladder pump assembly The pump <br /> effluent will be sampled and analyzed by EPA Method 601 or EPA Method 602 <br /> ' The pump effluent analysis results must register below the method reporting limit <br /> for each parameter before the pump is taken to the site for use <br /> Decontaminated disposable polyethylene bailers (i a 'Voss Single Sample <br /> Disposable Bailers") may be used in lieu of decontamination procedure <br /> ' <br /> During 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 /> 1 <br /> i <br /> 1 C - 2 <br /> 1 <br />