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polyethylene bailer, equipped with a bottom-emptying device, on a nylon cord through the <br /> casing and into the slotted section New sterile gloves are used to handle the bailer and sample <br /> vials for each sample The groundwater is transferred from the bailer to 40-milliliter glass <br /> vials (VOA vials), plastic bottles and/or 1-liter amber bottles with Teflon septum lids The <br /> samples are labeled, logged onto a chain-of-custody document, and kept in cold storage during <br /> field work and transport to a state-certified analytical laboratory. A collection procedure that <br /> precludes air from entering the sample containers is followed to prevent the release of volatile <br /> organic compounds This is verified once the containers are filled and sealed by inverting and <br /> tapping them to confirm no air bubbles are present To prevent cross-contamination, a new <br /> disposable polyethylene bailer is typically used for each well <br /> Upon completion of the soil and groundwater sampling, the borings are backfilled with <br /> P P <br /> bentonite pellets and hydrated The upper portion of each borehole is backfilled with cement <br /> r <br /> t <br />