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obtained within 72 hours, the lysimeter is recorded as dry for the monitoring period and suction will <br /> be reapplied during the next monitoring event <br /> SAMPLE PRESERVATION AND HANDLING <br /> Samples are preserved for analysis by following specific preservation and handling procedures <br /> which vary depending on the container type. <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 /> Sample Handling <br /> Sample containers are labeled immediately following collection. Samples are kept cool with cold <br /> packs until received by the laboratory. 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 /> SAMPLE DOCUMENTATION <br /> Sample documentation is used to provide chain-of-custody control during sample handling from <br /> collection through storage and includes the use of the following: <br /> • Field logbook to document sampling activities in the field <br /> • Labels identifying individual samples <br /> • Chain-of-custody record sheets for documenting possession and transfer of samples <br /> i <br /> • Laboratory analysis request sheets for documenting analyses to be performed <br /> Groundwater Monitoring A-J Department of Public WorkslSofid Waste <br /> County of San Joaquin <br />