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GROUNDWATER SAMPLING <br /> Prior to collecting a sample of groundwater from a well, the well will be purged by <br /> removing three or more well volumes of water, using either a pump or a bailer A well <br /> volume is defined as the amount of groundwater in the well casing The pH and electrical <br /> conductivity of the water will be measured periodically during the purging <br /> The groundwater sample will be obtained with a teflon or disposable polyurethane bailer <br /> equipped with a bottom-emptying valve To release water from the bailer with minimal <br /> aeration, the protrusion on the bottom-emptying device actuates the bottom check valve and <br /> regulates the flow into the sample bottle <br /> The sample bottles will be obtained precleaned from the analytical laboratory, and it will <br /> be specific with respect to size and material to the type of analysis to be performed The <br /> bottle will be carefully filled to the very top, in order to create a meniscus, and sealed with <br /> a teflon-lined cap (septa) These precautions aid in eliminating air from the sample The <br /> sample will be visually inspected to ensure that no air bubbles remain within <br /> Depending on the type of chemical analysis required, samples will be preserved with acid <br /> and/or they are cooled to 4 degrees Celsius Samples then will be labeled, stored, and <br /> transported in cooled ice chests to the analytical laboratory within the permissible holding <br /> time <br /> i <br />