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.a 3 �p - V PII;ASE I IMROO-sEOLOGIC INVES 11GATiON WORK PLAN 4491 West Durham Ferry Road,Tracy,California I Delta Project NG.40-91-732 Page 6 5.0 QUALITY ASSURANCE PLAN 5.1 General Sample Collection and Ha;.dlinaProctdures Proper collection and handling ars essential to ensure the quality of a sample. Each sample will be collected in a suitable wittainer, preserved correctly for the intended analyses, and stored prior to analysis for no longer than the maximum ailowable holding time. 51 Sample Identification and Chain-of•Custod Procedures Sample identification and chain-of-custody procedures ensure sample integrity and document sample possession from time of collection to its ultimate disposal. Each sample container submitted for analysis will / have a label affixed to the containers to identify the job number,sampler,date and time o°sample collection, and a sample number unique to that sample. This information,in addition to a description of the sample, field measurements made,sampling methodology,names of on-site personnel,and any other pertinent Meld j observations will be recorded on the borehole log or in the field records. All samples will be analyzed by i '. a qualified laboratory. A chain-of-custody form will be used to record possession of the sample from time of collection to its arrival at the laboratory. When the samples are shipped,the person in custody of the samples will relinquish the " samples by signing the chain-of-custody form and noting the time of shipment. The sample control officer ` will verify the sample integrity and confir6 that it was collected in the proper container,preserved correctly, 3 - and that there is an adequate volume for analysis. 5.3 Analytical Quality Assurance In addition to rouline ralibration of the analytical instruments with standards and blanks, the analyst is required to run duplicates and spikes on N percent of the analyses to insure an added measure of precision and accuracy. Accuracy is also verified through the following: I. EPA and state certification program. I Participation in an interlaboratory or"round-robin"quality assurance program. 3. Verification of results with an alternative method. For example, volatile organics may be determined through either purge and trap or liquid-liquid extraction methods. t? Iylv