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fl <br />E <br />D <br />it <br />Li <br />J <br />C <br />L� <br />n <br />11 <br />C <br />I 1 <br />�I <br />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 />Samples are preserved for analysis by following specific preservation and handling procedures <br />which vary depending on the container type. <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 />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 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 />• Laboratory analysis request sheets for documenting analyses to be performed <br />Groundwater Monitoring <br />A-5 Department of Public Works/Solid Waste <br />County of San Joaquin <br />