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Lysimeter Sampling <br /> Vacuum and pressure are alternately applied to the lysimeters each monitoring event <br /> during the quarter to achieve the sample volumes required for analysis. If sufficient <br /> sample volume is not obtained, the Lysimeter is recorded as dry for the monitoring period <br /> and suction is reapplied during the next monitoring event. <br /> Sample Preservation and Handling <br /> The following section specifies sample containers, preservation methods, and sample <br /> handling procedures. <br /> Sample Containers and Preservation <br /> Sample containers vary with each type of analytical parameter. Container types and <br /> materials are selected to be nonreactive with the particular analytical parameter tested. <br /> Specific sample volume, container types, and preservation requirements are presented in <br /> Table A-1 for a wide range of parameters. <br /> Sample Handling <br /> Sample containers will be labeled immediately following collection. Samples are kept <br /> cool with cold packs or refrigerated until received by the laboratory. At the time of <br /> sampling, each sample is logged on a chain-of-custody record that accompanies the <br /> sample to the laboratory. <br /> The sampling team transfers the samples from the site to the laboratory. Within 24 hours <br /> after samples are received, samples are routinely shipped to lab. The laboratory manager <br /> checks the holding times for requested analyses so that they are not exceeded. <br /> Sample Documentation <br /> The following procedures are used during sampling and analysis to provide <br /> chain-of-custody control during sample handling from collection through storage. <br /> Sample documentation includes the use of the following: <br /> • Field logbook to document sampling activities in the field <br /> • Labels to identify individual samples <br /> • Chain-of-custody record sheets for documenting possession and transfer of <br /> samples <br /> Foothill WQPS Rev Ldoe <br /> A-4 <br />