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J.0 QUALITY ASSURANCE PLAN This section describes the field and analytical procedures to be followed throughout the investigation. 3.1 .General Sample Collection and Handline Procedures Proper collection and handling are essential to ensure the quality of a sample. Each sample will be collected in a suitable container, preserved correctly for the intended analysis, and stored prior to analysis for no longer than the maximum allowable holding time. Details on the procedure for collection and handling of soiI and ground water samples to be used on this project can be found in Section 1.0. 1.2 Samplg Identification and Chain-of-Custody Procedures Sample identification and chain-of-custody procedures ensure sample integrity and document sample possession from the time of collection to its ultimate disposal. Each sample container submitted for analysis will have a label affixed to identify the job number, sampler, date and time of 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 field observations will be recorded on the borehole log or in the field records. All samples will be analyzed by a California state-certified 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 them will relinquish the samples by signing the chain-of-custody form and noting the time of shipment. The sample control officer will verify sample integrity and confirm that it was collected in the proper container, preserved correctly, and that there is an adequate volume for analysis. 3.3 Analytical Ouality Assurance In addition to routine calibration of the analytical instruments with standards and blanks, the analyst is required to run duplicates and spikes on 10 percent of the analyses to insure an added measure of precision and accuracy. Accuracy is also verified through the following: 1. U.S. Environmental Protection Agency (EPA) and State certification programs. f� 2. Participation in an interlaboratory or "round-robin: quality assurance program. 3. Verification of results with an alternative method. For example, calcium may be determined by atomic absorption, ion chromatography, or titrimetric methods. Volatile organics may be determined through either purge and trap or liquid-liquid extraction methods.