Laserfiche WebLink
Sample Collection <br />' Sample collection procedures include equipment cleaning, water-level and <br /> total well-depth measurements, and well purging and sampling. <br />' Equipment Cleaning <br /> Sample bottles, caps, and septa used in sampling for volatile and <br /> semivolatile organics will be triple rinsed with high-purity deionized water. <br /> After being rinsed, sample bottles will be dried overnight at a temperature <br />' of 200°C. Sample caps and septa will be dried overnight at a temperature <br /> of 60°C. Sample bottles, caps, and septa will be protected from solvent <br /> contact between drying and actual use at the sampling site. Sampling <br />' containers will be used only once and discarded after analysis is complete. <br /> Plastic bottles and caps used in sampling for metals will be soaked <br />' overnight in a 1 percent nitric acid solution. Next, the bottles and caps will <br /> be triple rinsed with deionized water. Finally, the bottles and caps will be <br />' air dried before being used at the site. Plastic bottles and caps will be con- <br /> structed of linear polyethylene or polypropylene. Sampling containers will <br /> be used only once and discarded after analysis is complete. <br /> Before the sampling event is started, equipment that will be placed in the <br /> well or will come in contact with ground water will be disassembled and <br />' cleaned thoroughly with detergent water, and then steam cleaned with <br /> deionized water. Any parts that may absorb contaminants, such as plastic <br /> pump valves, bladders, etc., will be cleaned as described above or <br /> replaced. The inside surfaces of the positive displacement (bladder) pump <br /> tubing will be cleaned by heating the tubing overnight at 120°C with a low- <br /> flow, inert air source. <br />' Once the bladder pump is cleaned and reassembled, a pump blank will be <br /> obtained by pumping organic-free water through the bladder pump <br />' assembly. The pump effluent will be sampled and analyzed by EPA <br /> Method 601 or EPA Method 602. The pump effluent analysis results must <br /> register below the method reporting limit for each parameter before the <br />' pump is taken to the site for use. <br /> During field sampling, equipment surfaces that are placed in the well or <br />' contact ground water will be steam cleaned with deionized water before <br /> the next well is purged or sampled. <br />' pjfV92V920201 a C - 2 Rev. 0 June 1, 1992 <br />