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i <br /> i <br /> obtained within 72 hours,the lysimeter is recorded as dry for the monitoring period and suction will <br /> i <br /> be reapplied during the next monitoring event. <br /> rSAMPLE PRESERVATION AND HANDLING <br /> Samples are preserved for analysis by following specific preservation and handling procedures <br /> which vary depending on the container type. i <br /> I <br /> Sample Containers and Preservation <br /> Sample containers vary with each type of analytical parameter. Container types and materials are <br /> selected to be nonreactive with the particular analytical parameter tested. Specific preservation <br /> requirements are required for different container types(Table A-1). <br /> i <br /> t <br /> Sample Handling <br /> Sample containers are Iabeled immediately following collection. Samples are kept cool with cold <br /> packs until received by the Iaboratory. Cold packs are replaced each day to maintain refrigeration. At <br /> the time of sampling, each sample is logged on a sampling and analysis chain-of-custody record(see <br /> Figure A-3)that accompanies the sample to the laboratory. <br /> Within 24 hours after samples are received,samples are routinely shipped from EMCON to CAS. <br /> The CAS laboratory manager checks the holding times for requested analyses so that they are not <br /> exceeded. ) <br /> i <br /> SAMPLE DOCUMENTATION <br /> Sample documentation is used to provide chain-of-custody control during sample handling from E <br /> collection through storage and includes the use of the following: <br /> • Field logbook to document sampling activities in the field i <br /> • Labels identifying individual samples <br /> • Chain-of-custody record sheets for documenting possession and transfer of samples j <br /> • Laboratory analysis request sheets for documenting analyses to be performed <br /> i <br /> Groundwater Monitoring A-5 Department of Public Works/Solid Waste <br /> County of San Joaquin <br /> i <br /> i <br /> 1 <br /> 1 <br />