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Lysimeter Sampling <br /> If lysimeter sampling and analysis are required, a vacuum will be applied to the lysimeters only if <br /> an electrical conductivity monitor indicates that the soil-moisture content and soil suction are <br /> adequate for attempting to collect a sample. Vacuum and pressure will be alternately applied to the <br /> lysimeters over a 72-hour period to achieve the sample volumes required for analysis. If sufficient <br /> sample volume is not obtained within 72 hours, the Lysimeter will be recorded as dry for the <br /> monitoring period and suction will be reapplied during the next monitoring event. <br /> SAMPLE PRESERVATION AND HANDLING <br /> The following section specifies sample containers, preservation methods, and sample handling <br /> procedures. <br /> Sample Containers and Preservation <br /> Sample containers vary with each type of analytical parameter. Container types and materials will <br /> be selected to be nonreactive with the particular analytical parameter tested. Specific sample <br /> volume,container types, and preservation requirements are presented in Table A-1. <br /> Sample Handling <br /> Sample containers will be labeled immediately following collection. Samples will be kept cool with <br /> cold packs until received by the laboratory. Cold packs will be replaced each day to maintain <br /> refrigeration. At the time of sampling, each sample will be logged on a sampling and analysis <br /> chain-of-custody record(see Figure A-3)that will accompany the sample to the laboratory. <br /> The sampling team transfers the samples from the site to the CAS laboratory. Within 24 hours <br /> after samples are received, samples are routinely shipped from EMCON to CAS. The CAS <br /> ' laboratory manager will check the holding times for requested analyses so that they are not <br /> exceeded. <br /> SAMPLE DOCUMENTATION <br /> The following procedures will be used during sampling and analysis to provide chain-of-custody <br /> control during sample handling from collection through storage. Sample documentation will <br /> include the use of the following: <br /> • Field logbook to document sampling activities in the field <br /> • Labels identifying individual samples <br /> SAC\S:\WES\S&APR0C.D0C-95\w:1 5 <br />