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automatic recovery system (ARS) is operating at the site, purged water may be pumped into the <br /> ARS for treatment. <br /> Ground water samples are collected by lowering a 1.5-inch-diameter, bottom-fill, disposable <br /> polyethylene bailer just below the static water level in the well: The samples are carefully <br /> transferred from the check-valve-equipped bailer to I-liter and 40-milliliter glass containers. The <br /> sample containers are filled to zero headspace and fitted with Teflon-sealed caps. Each sample <br /> is labeled with the project number, well number, sample date, and sampler's initials. Samples <br /> remain chilled at approximately 4°C prior to analysis by a state-certified laboratory. <br /> CHAIN,OF CUSTODY PROTOCOL <br /> Chain of custody protocol is followed for all soil and ground'F water samples selected for <br /> laboratory analysis. The chain of custody form(s) accompanies the samples from the sampling <br /> locality to the laboratory, providing a continuous record of possession prior to analysis. <br /> DECONTAMINATION <br /> Drilling and Soil Sampling <br /> Drilling equipment is decontaminated by steam cleaning before being brought onsite. The augers <br /> are also steam cleaned before each new boring is commenced. Prior to use, the sampler and <br /> sampling tubes are brush-scrubbed in a Liqui-nox and potable water solution and rinsed twice in <br /> clean potable water. Sampling equipment and tubes are also decontaminated before each sample <br /> is collected to avoid cross-contamination between borings. <br /> Ground Water Sampling <br /> Purging and sampling equipment that could contact well fluids is either dedicated to a particular <br /> well or cleaned prior to each use in a Liqui-nox solution followed'by two tap water rinses. <br /> 9 <br />